/**************************************************************************** ** ** Implementation of QApplication class ** ** Created : 931107 ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the kernel module of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial licenses may use this file in accordance with the Qt ** Commercial License Agreement provided with the Software. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ #include "qobjectlist.h" #include "qapplication.h" #include "qeventloop.h" #include "qeventloop_p.h" #include "qwidget.h" #include "qwidgetlist.h" #include "qwidgetintdict.h" #include "qptrdict.h" #include "qcleanuphandler.h" #include "qtranslator.h" #include "qtextcodec.h" #include "qsessionmanager.h" #include "qdragobject.h" #include "qclipboard.h" #include "qcursor.h" #include "qstyle.h" #include "qstylefactory.h" #include "qfile.h" #include "qmessagebox.h" #include "qdir.h" #include "qfileinfo.h" #ifdef Q_WS_WIN #include "qinputcontext_p.h" #endif #include "qfontdata_p.h" #if defined(QT_THREAD_SUPPORT) # include "qmutex.h" # include "qthread.h" #endif // QT_THREAD_SUPPORT #include #ifdef truncate # undef truncate #endif /*! \class QApplication qapplication.h \brief The QApplication class manages the GUI application's control flow and main settings. \ingroup application \mainclass It contains the main event loop, where all events from the window system and other sources are processed and dispatched. It also handles the application's initialization and finalization, and provides session management. It also handles most system-wide and application-wide settings. For any GUI application that uses Qt, there is precisely one QApplication object, no matter whether the application has 0, 1, 2 or more windows at any time. The QApplication object is accessible through the global pointer \c qApp. Its main areas of responsibility are: \list \i It initializes the application with the user's desktop settings such as palette(), font() and doubleClickInterval(). It keeps track of these properties in case the user changes the desktop globally, for example through some kind of control panel. \i It performs event handling, meaning that it receives events from the underlying window system and dispatches them to the relevant widgets. By using sendEvent() and postEvent() you can send your own events to widgets. \i It parses common command line arguments and sets its internal state accordingly. See the \link QApplication::QApplication() constructor documentation\endlink below for more details about this. \i It defines the application's look and feel, which is encapsulated in a QStyle object. This can be changed at runtime with setStyle(). \i It specifies how the application is to allocate colors. See setColorSpec() for details. \i It provides localization of strings that are visible to the user via translate(). \i It provides some magical objects like the desktop() and the clipboard(). \i It knows about the application's windows. You can ask which widget is at a certain position using widgetAt(), get a list of topLevelWidgets() and closeAllWindows(), etc. \i It manages the application's mouse cursor handling, see setOverrideCursor() and setGlobalMouseTracking(). \i On the X window system, it provides functions to flush and sync the communication stream, see flushX() and syncX(). \i It provides support for sophisticated \link session.html session management \endlink. This makes it possible for applications to terminate gracefully when the user logs out, to cancel a shutdown process if termination isn't possible and even to preserve the entire application's state for a future session. See isSessionRestored(), sessionId() and commitData() and saveState() for details. \endlist The Application walk-through example contains a typical complete main() that does the usual things with QApplication. Since the QApplication object does so much initialization, it must be created before any other objects related to the user interface are created. Since it also deals with common command line arguments, it is usually a good idea to create it \e before any interpretation or modification of \c argv is done in the application itself. (Note also that for X11, setMainWidget() may change the main widget according to the \c -geometry option. To preserve this functionality, you must set your defaults before setMainWidget() and any overrides after.) \table \header \i21 Groups of functions \row \i System settings \i desktopSettingsAware(), setDesktopSettingsAware(), cursorFlashTime(), setCursorFlashTime(), doubleClickInterval(), setDoubleClickInterval(), wheelScrollLines(), setWheelScrollLines(), palette(), setPalette(), font(), setFont(), fontMetrics(). \row \i Event handling \i exec(), processEvents(), enter_loop(), exit_loop(), exit(), quit(). sendEvent(), postEvent(), sendPostedEvents(), removePostedEvents(), hasPendingEvents(), notify(), macEventFilter(), qwsEventFilter(), x11EventFilter(), x11ProcessEvent(), winEventFilter(). \row \i GUI Styles \i style(), setStyle(), polish(). \row \i Color usage \i colorSpec(), setColorSpec(), qwsSetCustomColors(). \row \i Text handling \i installTranslator(), removeTranslator() translate(). \row \i Widgets \i mainWidget(), setMainWidget(), allWidgets(), topLevelWidgets(), desktop(), activePopupWidget(), activeModalWidget(), clipboard(), focusWidget(), winFocus(), activeWindow(), widgetAt(). \row \i Advanced cursor handling \i hasGlobalMouseTracking(), setGlobalMouseTracking(), overrideCursor(), setOverrideCursor(), restoreOverrideCursor(). \row \i X Window System synchronization \i flushX(), syncX(). \row \i Session management \i isSessionRestored(), sessionId(), commitData(), saveState(). \row \i Threading \i lock(), unlock(), locked(), tryLock(), wakeUpGuiThread() \row \i Miscellaneous \i closeAllWindows(), startingUp(), closingDown(), type(). \endtable \e {Non-GUI programs:} While Qt is not optimized or designed for writing non-GUI programs, it's possible to use \link tools.html some of its classes \endlink without creating a QApplication. This can be useful if you wish to share code between a non-GUI server and a GUI client. \headerfile qnamespace.h \headerfile qwindowdefs.h \headerfile qglobal.h */ /*! \enum Qt::HANDLE \internal */ /*! \enum QApplication::Type \value Tty a console application \value GuiClient a GUI client application \value GuiServer a GUI server application */ /*! \enum QApplication::ColorSpec \value NormalColor the default color allocation policy \value CustomColor the same as NormalColor for X11; allocates colors to a palette on demand under Windows \value ManyColor the right choice for applications that use thousands of colors See setColorSpec() for full details. */ /* The qt_init() and qt_cleanup() functions are implemented in the qapplication_xyz.cpp file. */ void qt_init( int *, char **, QApplication::Type ); void qt_cleanup(); #if defined(Q_WS_X11) void qt_init( Display* dpy, Qt::HANDLE, Qt::HANDLE ); #endif Q_EXPORT bool qt_tryModalHelper( QWidget *widget, QWidget **rettop ); QApplication *qApp = 0; // global application object QStyle *QApplication::app_style = 0; // default application style bool qt_explicit_app_style = FALSE; // style explicitly set by programmer int QApplication::app_cspec = QApplication::NormalColor; #ifndef QT_NO_PALETTE QPalette *QApplication::app_pal = 0; // default application palette #endif QFont *QApplication::app_font = 0; // default application font bool qt_app_has_font = FALSE; #ifndef QT_NO_CURSOR QCursor *QApplication::app_cursor = 0; // default application cursor #endif int QApplication::app_tracking = 0; // global mouse tracking bool QApplication::is_app_running = FALSE; // app starting up if FALSE bool QApplication::is_app_closing = FALSE; // app closing down if TRUE int QApplication::loop_level = 0; // event loop level QWidget *QApplication::main_widget = 0; // main application widget QWidget *QApplication::focus_widget = 0; // has keyboard input focus QWidget *QApplication::active_window = 0; // toplevel with keyboard focus bool QApplication::obey_desktop_settings = TRUE; // use winsys resources int QApplication::cursor_flash_time = 1000; // text caret flash time int QApplication::mouse_double_click_time = 400; // mouse dbl click limit #ifndef QT_NO_WHEELEVENT int QApplication::wheel_scroll_lines = 3; // number of lines to scroll #endif bool qt_is_gui_used; bool Q_EXPORT qt_resolve_symlinks = TRUE; bool Q_EXPORT qt_tab_all_widgets = TRUE; QRect qt_maxWindowRect; static int drag_time = 500; static int drag_distance = 4; static bool reverse_layout = FALSE; QSize QApplication::app_strut = QSize( 0,0 ); // no default application strut bool QApplication::animate_ui = TRUE; bool QApplication::animate_menu = FALSE; bool QApplication::fade_menu = FALSE; bool QApplication::animate_combo = FALSE; bool QApplication::animate_tooltip = FALSE; bool QApplication::fade_tooltip = FALSE; bool QApplication::animate_toolbox = FALSE; bool QApplication::widgetCount = FALSE; QApplication::Type qt_appType=QApplication::Tty; #ifndef QT_NO_COMPONENT QStringList *QApplication::app_libpaths = 0; #endif bool QApplication::metaComposeUnicode = FALSE; int QApplication::composedUnicode = 0; #ifdef QT_THREAD_SUPPORT QMutex *QApplication::qt_mutex = 0; static QMutex *postevent_mutex = 0; static Qt::HANDLE qt_application_thread_id = 0; Q_EXPORT Qt::HANDLE qt_get_application_thread_id() { return qt_application_thread_id; } #endif // QT_THREAD_SUPPORT QEventLoop *QApplication::eventloop = 0; // application event loop #ifndef QT_NO_ACCEL extern bool qt_dispatchAccelEvent( QWidget*, QKeyEvent* ); // def in qaccel.cpp extern bool qt_tryComposeUnicode( QWidget*, QKeyEvent* ); // def in qaccel.cpp #endif #if defined(QT_TABLET_SUPPORT) bool chokeMouse = FALSE; #endif void qt_setMaxWindowRect(const QRect& r) { qt_maxWindowRect = r; // Re-resize any maximized windows QWidgetList* l = QApplication::topLevelWidgets(); if ( l ) { QWidget *w = l->first(); while ( w ) { if ( w->isVisible() && w->isMaximized() ) { w->showNormal(); //#### flicker w->showMaximized(); } w = l->next(); } delete l; } } typedef void (*VFPTR)(); typedef QValueList QVFuncList; static QVFuncList *postRList = 0; // list of post routines /*! \relates QApplication Adds a global routine that will be called from the QApplication destructor. This function is normally used to add cleanup routines for program-wide functionality. The function given by \a p should take no arguments and return nothing, like this: \code static int *global_ptr = 0; static void cleanup_ptr() { delete [] global_ptr; global_ptr = 0; } void init_ptr() { global_ptr = new int[100]; // allocate data qAddPostRoutine( cleanup_ptr ); // delete later } \endcode Note that for an application- or module-wide cleanup, qAddPostRoutine() is often not suitable. People have a tendency to make such modules dynamically loaded, and then unload those modules long before the QApplication destructor is called, for example. For modules and libraries, using a reference-counted initialization manager or Qt' parent-child delete mechanism may be better. Here is an example of a private class which uses the parent-child mechanism to call a cleanup function at the right time: \code class MyPrivateInitStuff: public QObject { private: MyPrivateInitStuff( QObject * parent ): QObject( parent) { // initialization goes here } MyPrivateInitStuff * p; public: static MyPrivateInitStuff * initStuff( QObject * parent ) { if ( !p ) p = new MyPrivateInitStuff( parent ); return p; } ~MyPrivateInitStuff() { // cleanup (the "post routine") goes here } } \endcode By selecting the right parent widget/object, this can often be made to clean up the module's data at the exact right moment. */ Q_EXPORT void qAddPostRoutine( QtCleanUpFunction p) { if ( !postRList ) { postRList = new QVFuncList; Q_CHECK_PTR( postRList ); } postRList->prepend( p ); } Q_EXPORT void qRemovePostRoutine( QtCleanUpFunction p ) { if ( !postRList ) return; QVFuncList::Iterator it = postRList->begin(); while ( it != postRList->end() ) { if ( *it == p ) { postRList->remove( it ); it = postRList->begin(); } else { ++it; } } } // Default application palettes and fonts (per widget type) QAsciiDict *QApplication::app_palettes = 0; QAsciiDict *QApplication::app_fonts = 0; #ifndef QT_NO_SESSIONMANAGER QString *QApplication::session_key = 0; // ## session key. Should be a member in 4.0 #endif QWidgetList *QApplication::popupWidgets = 0; // has keyboard input focus QDesktopWidget *qt_desktopWidget = 0; // root window widgets #ifndef QT_NO_CLIPBOARD QClipboard *qt_clipboard = 0; // global clipboard object #endif QWidgetList * qt_modal_stack=0; // stack of modal widgets // Definitions for posted events struct QPostEvent { QPostEvent( QObject *r, QEvent *e ): receiver( r ), event( e ) {} ~QPostEvent() { delete event; } QObject *receiver; QEvent *event; }; class Q_EXPORT QPostEventList : public QPtrList { public: QPostEventList() : QPtrList() {} QPostEventList( const QPostEventList &list ) : QPtrList(list) {} ~QPostEventList() { clear(); } QPostEventList &operator=(const QPostEventList &list) { return (QPostEventList&)QPtrList::operator=(list); } }; class Q_EXPORT QPostEventListIt : public QPtrListIterator { public: QPostEventListIt( const QPostEventList &l ) : QPtrListIterator(l) {} QPostEventListIt &operator=(const QPostEventListIt &i) { return (QPostEventListIt&)QPtrListIterator::operator=(i); } }; static QPostEventList *globalPostedEvents = 0; // list of posted events uint qGlobalPostedEventsCount() { if (!globalPostedEvents) return 0; return globalPostedEvents->count(); } static QSingleCleanupHandler qapp_cleanup_events; #ifndef QT_NO_PALETTE QPalette *qt_std_pal = 0; void qt_create_std_palette() { if ( qt_std_pal ) delete qt_std_pal; QColor standardLightGray( 192, 192, 192 ); QColor light( 255, 255, 255 ); QColor dark( standardLightGray.dark( 150 ) ); QColorGroup std_act( Qt::black, standardLightGray, light, dark, Qt::gray, Qt::black, Qt::white ); QColorGroup std_dis( Qt::darkGray, standardLightGray, light, dark, Qt::gray, Qt::darkGray, std_act.background() ); QColorGroup std_inact( Qt::black, standardLightGray, light, dark, Qt::gray, Qt::black, Qt::white ); qt_std_pal = new QPalette( std_act, std_dis, std_inact ); } static void qt_fix_tooltips() { // No resources for this yet (unlike on Windows). QColorGroup cg( Qt::black, QColor(255,255,220), QColor(96,96,96), Qt::black, Qt::black, Qt::black, QColor(255,255,220) ); QPalette pal( cg, cg, cg ); QApplication::setPalette( pal, TRUE, "QTipLabel"); } #endif void QApplication::process_cmdline( int* argcptr, char ** argv ) { // process platform-indep command line if ( !qt_is_gui_used || !*argcptr) return; int argc = *argcptr; int i, j; j = 1; for ( i=1; i= 0 ) { if ( !session_key ) session_key = new QString; *session_key = session_id.mid( p +1 ); session_id = session_id.left( p ); } is_session_restored = TRUE; } #endif } else if ( qstrcmp(arg, "-reverse") == 0 ) { setReverseLayout( TRUE ); } else if ( qstrcmp(arg, "-widgetcount") == 0 ) { widgetCount = TRUE;; } else { argv[j++] = argv[i]; } #ifndef QT_NO_STYLE if ( !s.isEmpty() ) { setStyle( s ); } #endif } if(j < argc) { #ifdef Q_WS_MACX static char* empty = "\0"; argv[j] = empty; #else argv[j] = 0; #endif *argcptr = j; } } /*! Initializes the window system and constructs an application object with \a argc command line arguments in \a argv. The global \c qApp pointer refers to this application object. Only one application object should be created. This application object must be constructed before any \link QPaintDevice paint devices\endlink (including widgets, pixmaps, bitmaps etc.). Note that \a argc and \a argv might be changed. Qt removes command line arguments that it recognizes. The modified \a argc and \a argv can also be accessed later with \c qApp->argc() and \c qApp->argv(). The documentation for argv() contains a detailed description of how to process command line arguments. Qt debugging options (not available if Qt was compiled with the QT_NO_DEBUG flag defined): \list \i -nograb, tells Qt that it must never grab the mouse or the keyboard. \i -dograb (only under X11), running under a debugger can cause an implicit -nograb, use -dograb to override. \i -sync (only under X11), switches to synchronous mode for debugging. \endlist See \link debug.html Debugging Techniques \endlink for a more detailed explanation. All Qt programs automatically support the following command line options: \list \i -reverse causes text to be formatted for right-to-left languages rather than in the usual left-to-right direction. \i -style= \e style, sets the application GUI style. Possible values are \c motif, \c windows, and \c platinum. If you compiled Qt with additional styles or have additional styles as plugins these will be available to the \c -style command line option. \i -style \e style, is the same as listed above. \i -session= \e session, restores the application from an earlier \link session.html session \endlink. \i -session \e session, is the same as listed above. \i -widgetcount, prints debug message at the end about number of widgets left undestroyed and maximum number of widgets existed at the same time \endlist The X11 version of Qt also supports some traditional X11 command line options: \list \i -display \e display, sets the X display (default is $DISPLAY). \i -geometry \e geometry, sets the client geometry of the \link setMainWidget() main widget\endlink. \i -fn or \c -font \e font, defines the application font. The font should be specified using an X logical font description. \i -bg or \c -background \e color, sets the default background color and an application palette (light and dark shades are calculated). \i -fg or \c -foreground \e color, sets the default foreground color. \i -btn or \c -button \e color, sets the default button color. \i -name \e name, sets the application name. \i -title \e title, sets the application title (caption). \i -visual \c TrueColor, forces the application to use a TrueColor visual on an 8-bit display. \i -ncols \e count, limits the number of colors allocated in the color cube on an 8-bit display, if the application is using the \c QApplication::ManyColor color specification. If \e count is 216 then a 6x6x6 color cube is used (i.e. 6 levels of red, 6 of green, and 6 of blue); for other values, a cube approximately proportional to a 2x3x1 cube is used. \i -cmap, causes the application to install a private color map on an 8-bit display. \endlist \sa argc(), argv() */ //######### BINARY COMPATIBILITY constructor QApplication::QApplication( int &argc, char **argv ) { construct( argc, argv, GuiClient ); } /*! Constructs an application object with \a argc command line arguments in \a argv. If \a GUIenabled is TRUE, a GUI application is constructed, otherwise a non-GUI (console) application is created. Set \a GUIenabled to FALSE for programs without a graphical user interface that should be able to run without a window system. On X11, the window system is initialized if \a GUIenabled is TRUE. If \a GUIenabled is FALSE, the application does not connect to the X-server. On Windows and Macintosh, currently the window system is always initialized, regardless of the value of GUIenabled. This may change in future versions of Qt. The following example shows how to create an application that uses a graphical interface when available. \code int main( int argc, char **argv ) { #ifdef Q_WS_X11 bool useGUI = getenv( "DISPLAY" ) != 0; #else bool useGUI = TRUE; #endif QApplication app(argc, argv, useGUI); if ( useGUI ) { //start GUI version ... } else { //start non-GUI version ... } return app.exec(); } \endcode */ QApplication::QApplication( int &argc, char **argv, bool GUIenabled ) { construct( argc, argv, GUIenabled ? GuiClient : Tty ); } /*! Constructs an application object with \a argc command line arguments in \a argv. For Qt/Embedded, passing \c QApplication::GuiServer for \a type makes this application the server (equivalent to running with the -qws option). */ QApplication::QApplication( int &argc, char **argv, Type type ) { construct( argc, argv, type ); } Q_EXPORT void qt_ucm_initialize( QApplication *theApp ) { if ( qApp ) return; int argc = theApp->argc(); char **argv = theApp->argv(); theApp->construct( argc, argv, qApp->type() ); Q_ASSERT( qApp == theApp ); } void QApplication::construct( int &argc, char **argv, Type type ) { qt_appType = type; qt_is_gui_used = (type != Tty); init_precmdline(); static const char *empty = ""; if ( argc == 0 || argv == 0 ) { argc = 0; argv = (char **)∅ // ouch! careful with QApplication::argv()! } app_argc = argc; app_argv = argv; qt_init( &argc, argv, type ); // Must be called before initialize() process_cmdline( &argc, argv ); initialize( argc, argv ); if ( qt_is_gui_used ) qt_maxWindowRect = desktop()->rect(); if ( eventloop ) eventloop->appStartingUp(); } /*! Returns the type of application, Tty, GuiClient or GuiServer. */ QApplication::Type QApplication::type() const { return qt_appType; } #if defined(Q_WS_X11) /*! Create an application, given an already open display \a dpy. If \a visual and \a colormap are non-zero, the application will use those as the default Visual and Colormap contexts. \warning Qt only supports TrueColor visuals at depths higher than 8 bits-per-pixel. This is available only on X11. */ QApplication::QApplication( Display* dpy, HANDLE visual, HANDLE colormap ) { static int aargc = 1; // ### a string literal is a cont char* // ### using it as a char* is wrong and could lead to segfaults // ### if aargv is modified someday static char *aargv[] = { (char*)"unknown", 0 }; app_argc = aargc; app_argv = aargv; qt_appType = GuiClient; qt_is_gui_used = TRUE; qt_appType = GuiClient; init_precmdline(); // ... no command line. if ( ! dpy ) { #ifdef QT_CHECK_STATE qWarning( "QApplication: invalid Display* argument." ); #endif // QT_CHECK_STATE qt_init( &aargc, aargv, GuiClient ); } else { qt_init( dpy, visual, colormap ); } initialize( aargc, aargv ); if ( qt_is_gui_used ) qt_maxWindowRect = desktop()->rect(); if ( eventloop ) eventloop->appStartingUp(); } /*! Create an application, given an already open display \a dpy and using \a argc command line arguments in \a argv. If \a visual and \a colormap are non-zero, the application will use those as the default Visual and Colormap contexts. \warning Qt only supports TrueColor visuals at depths higher than 8 bits-per-pixel. This is available only on X11. */ QApplication::QApplication(Display *dpy, int argc, char **argv, HANDLE visual, HANDLE colormap) { qt_appType = GuiClient; qt_is_gui_used = TRUE; qt_appType = GuiClient; init_precmdline(); app_argc = argc; app_argv = argv; if ( ! dpy ) { #ifdef QT_CHECK_STATE qWarning( "QApplication: invalid Display* argument." ); #endif // QT_CHECK_STATE qt_init( &argc, argv, GuiClient ); } else { qt_init(dpy, visual, colormap); } process_cmdline( &argc, argv ); initialize(argc, argv); if ( qt_is_gui_used ) qt_maxWindowRect = desktop()->rect(); if ( eventloop ) eventloop->appStartingUp(); } #endif // Q_WS_X11 void QApplication::init_precmdline() { translators = 0; is_app_closing = FALSE; #ifndef QT_NO_SESSIONMANAGER is_session_restored = FALSE; #endif #if defined(QT_CHECK_STATE) if ( qApp ) qWarning( "QApplication: There should be max one application object" ); #endif qApp = (QApplication*)this; } /*! Initializes the QApplication object, called from the constructors. */ void QApplication::initialize( int argc, char **argv ) { #ifdef QT_THREAD_SUPPORT qt_mutex = new QMutex( TRUE ); postevent_mutex = new QMutex( TRUE ); qt_application_thread_id = QThread::currentThread(); #endif // QT_THREAD_SUPPORT app_argc = argc; app_argv = argv; quit_now = FALSE; quit_code = 0; QWidget::createMapper(); // create widget mapper #ifndef QT_NO_PALETTE (void) palette(); // trigger creation of application palette #endif is_app_running = TRUE; // no longer starting up #ifndef QT_NO_SESSIONMANAGER // connect to the session manager if ( !session_key ) session_key = new QString; session_manager = new QSessionManager( qApp, session_id, *session_key ); #endif } /***************************************************************************** Functions returning the active popup and modal widgets. *****************************************************************************/ /*! Returns the active popup widget. A popup widget is a special top level widget that sets the \c WType_Popup widget flag, e.g. the QPopupMenu widget. When the application opens a popup widget, all events are sent to the popup. Normal widgets and modal widgets cannot be accessed before the popup widget is closed. Only other popup widgets may be opened when a popup widget is shown. The popup widgets are organized in a stack. This function returns the active popup widget at the top of the stack. \sa activeModalWidget(), topLevelWidgets() */ QWidget *QApplication::activePopupWidget() { return popupWidgets ? popupWidgets->getLast() : 0; } /*! Returns the active modal widget. A modal widget is a special top level widget which is a subclass of QDialog that specifies the modal parameter of the constructor as TRUE. A modal widget must be closed before the user can continue with other parts of the program. Modal widgets are organized in a stack. This function returns the active modal widget at the top of the stack. \sa activePopupWidget(), topLevelWidgets() */ QWidget *QApplication::activeModalWidget() { return qt_modal_stack ? qt_modal_stack->getFirst() : 0; } /*! Cleans up any window system resources that were allocated by this application. Sets the global variable \c qApp to 0. */ QApplication::~QApplication() { #ifndef QT_NO_CLIPBOARD // flush clipboard contents if ( qt_clipboard ) { QCustomEvent event( QEvent::Clipboard ); QApplication::sendEvent( qt_clipboard, &event ); } #endif if ( eventloop ) eventloop->appClosingDown(); if ( postRList ) { QVFuncList::Iterator it = postRList->begin(); while ( it != postRList->end() ) { // call post routines (**it)(); postRList->remove( it ); it = postRList->begin(); } delete postRList; postRList = 0; } QObject *tipmanager = child( "toolTipManager", "QTipManager", FALSE ); delete tipmanager; delete qt_desktopWidget; qt_desktopWidget = 0; is_app_closing = TRUE; #ifndef QT_NO_CLIPBOARD delete qt_clipboard; qt_clipboard = 0; #endif QWidget::destroyMapper(); #ifndef QT_NO_PALETTE delete qt_std_pal; qt_std_pal = 0; delete app_pal; app_pal = 0; delete app_palettes; app_palettes = 0; #endif delete app_font; app_font = 0; delete app_fonts; app_fonts = 0; #ifndef QT_NO_STYLE delete app_style; app_style = 0; #endif #ifndef QT_NO_CURSOR delete app_cursor; app_cursor = 0; #endif #ifndef QT_NO_TRANSLATION delete translators; #endif #ifndef QT_NO_DRAGANDDROP extern QDragManager *qt_dnd_manager; delete qt_dnd_manager; #endif qt_cleanup(); #ifndef QT_NO_COMPONENT delete app_libpaths; app_libpaths = 0; #endif #ifdef QT_THREAD_SUPPORT delete qt_mutex; qt_mutex = 0; delete postevent_mutex; postevent_mutex = 0; #endif // QT_THREAD_SUPPORT if( qApp == this ) { if ( postedEvents ) removePostedEvents( this ); qApp = 0; } is_app_running = FALSE; if ( widgetCount ) { qDebug( "Widgets left: %i Max widgets: %i \n", QWidget::instanceCounter, QWidget::maxInstances ); } #ifndef QT_NO_SESSIONMANAGER delete session_manager; session_manager = 0; delete session_key; session_key = 0; #endif //QT_NO_SESSIONMANAGER qt_explicit_app_style = FALSE; qt_app_has_font = FALSE; app_tracking = 0; obey_desktop_settings = TRUE; cursor_flash_time = 1000; mouse_double_click_time = 400; #ifndef QT_NO_WHEELEVENT wheel_scroll_lines = 3; #endif drag_time = 500; drag_distance = 4; reverse_layout = FALSE; app_strut = QSize( 0, 0 ); animate_ui = TRUE; animate_menu = FALSE; fade_menu = FALSE; animate_combo = FALSE; animate_tooltip = FALSE; fade_tooltip = FALSE; widgetCount = FALSE; } /*! \fn int QApplication::argc() const Returns the number of command line arguments. The documentation for argv() describes how to process command line arguments. \sa argv(), QApplication::QApplication() */ /*! \fn char **QApplication::argv() const Returns the command line argument vector. \c argv()[0] is the program name, \c argv()[1] is the first argument and \c argv()[argc()-1] is the last argument. A QApplication object is constructed by passing \e argc and \e argv from the \c main() function. Some of the arguments may be recognized as Qt options and removed from the argument vector. For example, the X11 version of Qt knows about \c -display, \c -font and a few more options. Example: \code // showargs.cpp - displays program arguments in a list box #include #include int main( int argc, char **argv ) { QApplication a( argc, argv ); QListBox b; a.setMainWidget( &b ); for ( int i = 0; i < a.argc(); i++ ) // a.argc() == argc b.insertItem( a.argv()[i] ); // a.argv()[i] == argv[i] b.show(); return a.exec(); } \endcode If you run \c{showargs -display unix:0 -font 9x15bold hello world} under X11, the list box contains the three strings "showargs", "hello" and "world". Qt provides a global pointer, \c qApp, that points to the QApplication object, and through which you can access argc() and argv() in functions other than main(). \sa argc(), QApplication::QApplication() */ /*! \fn void QApplication::setArgs( int argc, char **argv ) \internal */ #ifndef QT_NO_STYLE static QString *qt_style_override = 0; /*! Returns the application's style object. \sa setStyle(), QStyle */ QStyle& QApplication::style() { #ifndef QT_NO_STYLE if ( app_style ) return *app_style; if ( !qt_is_gui_used ) qFatal( "No style available in non-gui applications!" ); #if defined(Q_WS_X11) if(!qt_style_override) x11_initialize_style(); // run-time search for default style #endif if ( !app_style ) { // Compile-time search for default style // QString style; if ( qt_style_override ) { style = *qt_style_override; delete qt_style_override; qt_style_override = 0; } else { # if defined(Q_WS_WIN) && defined(Q_OS_TEMP) style = "PocketPC"; #elif defined(Q_WS_WIN) if ( qWinVersion() >= Qt::WV_XP && qWinVersion() < Qt::WV_NT_based ) style = "WindowsXP"; else style = "Windows"; // default styles for Windows #elif defined(Q_WS_X11) && defined(Q_OS_SOLARIS) style = "CDE"; // default style for X11 on Solaris #elif defined(Q_WS_X11) && defined(Q_OS_IRIX) style = "SGI"; // default style for X11 on IRIX #elif defined(Q_WS_X11) style = "Motif"; // default style for X11 #elif defined(Q_WS_MAC) style = "Macintosh"; // default style for all Mac's #elif defined(Q_WS_QWS) style = "Compact"; // default style for small devices #endif } app_style = QStyleFactory::create( style ); if ( !app_style && // platform default style not available, try alternatives !(app_style = QStyleFactory::create( "Windows" ) ) && !(app_style = QStyleFactory::create( "Platinum" ) ) && !(app_style = QStyleFactory::create( "MotifPlus" ) ) && !(app_style = QStyleFactory::create( "Motif" ) ) && !(app_style = QStyleFactory::create( "CDE" ) ) && !(app_style = QStyleFactory::create( "Aqua" ) ) && !(app_style = QStyleFactory::create( "SGI" ) ) && !(app_style = QStyleFactory::create( "Compact" ) ) #ifndef QT_NO_STRINGLIST && !(app_style = QStyleFactory::create( QStyleFactory::keys()[0] ) ) #endif ) qFatal( "No %s style available!", style.latin1() ); } QPalette app_pal_copy ( *app_pal ); app_style->polish( *app_pal ); if ( is_app_running && !is_app_closing && (*app_pal != app_pal_copy) ) { QEvent e( QEvent::ApplicationPaletteChange ); QWidgetIntDictIt it( *((QWidgetIntDict*)QWidget::mapper) ); register QWidget *w; while ( (w=it.current()) ) { // for all widgets... ++it; sendEvent( w, &e ); } } app_style->polish( qApp ); #endif return *app_style; } /*! Sets the application's GUI style to \a style. Ownership of the style object is transferred to QApplication, so QApplication will delete the style object on application exit or when a new style is set. Example usage: \code QApplication::setStyle( new QWindowsStyle ); \endcode When switching application styles, the color palette is set back to the initial colors or the system defaults. This is necessary since certain styles have to adapt the color palette to be fully style-guide compliant. \sa style(), QStyle, setPalette(), desktopSettingsAware() */ void QApplication::setStyle( QStyle *style ) { QStyle* old = app_style; app_style = style; #ifdef Q_WS_X11 qt_explicit_app_style = TRUE; #endif // Q_WS_X11 if ( startingUp() ) { delete old; return; } // clean up the old style if (old) { if ( is_app_running && !is_app_closing ) { QWidgetIntDictIt it( *((QWidgetIntDict*)QWidget::mapper) ); register QWidget *w; while ( (w=it.current()) ) { // for all widgets... ++it; if ( !w->testWFlags(WType_Desktop) && // except desktop w->testWState(WState_Polished) ) { // has been polished old->unPolish(w); } } } old->unPolish( qApp ); } // take care of possible palette requirements of certain gui // styles. Do it before polishing the application since the style // might call QApplication::setStyle() itself if ( !qt_std_pal ) qt_create_std_palette(); QPalette tmpPal = *qt_std_pal; setPalette( tmpPal, TRUE ); // initialize the application with the new style app_style->polish( qApp ); // re-polish existing widgets if necessary if (old) { if ( is_app_running && !is_app_closing ) { QWidgetIntDictIt it( *((QWidgetIntDict*)QWidget::mapper) ); register QWidget *w; while ( (w=it.current()) ) { // for all widgets... ++it; if ( !w->testWFlags(WType_Desktop) ) { // except desktop if ( w->testWState(WState_Polished) ) app_style->polish(w); // repolish w->styleChange( *old ); if ( w->isVisible() ){ w->update(); } } } } delete old; } } /*! \overload Requests a QStyle object for \a style from the QStyleFactory. The string must be one of the QStyleFactory::keys(), typically one of "windows", "motif", "cde", "motifplus", "platinum", "sgi" and "compact". Depending on the platform, "windowsxp", "aqua" or "macintosh" may be available. A later call to the QApplication constructor will override the requested style when a "-style" option is passed in as a commandline parameter. Returns 0 if an unknown \a style is passed, otherwise the QStyle object returned is set as the application's GUI style. */ QStyle* QApplication::setStyle( const QString& style ) { #ifdef Q_WS_X11 qt_explicit_app_style = TRUE; #endif // Q_WS_X11 if ( startingUp() ) { if(qt_style_override) *qt_style_override = style; else qt_style_override = new QString(style); return 0; } QStyle *s = QStyleFactory::create( style ); if ( !s ) return 0; setStyle( s ); return s; } #endif #if 1 /* OBSOLETE */ QApplication::ColorMode QApplication::colorMode() { return (QApplication::ColorMode)app_cspec; } void QApplication::setColorMode( QApplication::ColorMode mode ) { app_cspec = mode; } #endif /*! Returns the color specification. \sa QApplication::setColorSpec() */ int QApplication::colorSpec() { return app_cspec; } /*! Sets the color specification for the application to \a spec. The color specification controls how the application allocates colors when run on a display with a limited amount of colors, e.g. 8 bit / 256 color displays. The color specification must be set before you create the QApplication object. The options are: \list \i QApplication::NormalColor. This is the default color allocation strategy. Use this option if your application uses buttons, menus, texts and pixmaps with few colors. With this option, the application uses system global colors. This works fine for most applications under X11, but on Windows machines it may cause dithering of non-standard colors. \i QApplication::CustomColor. Use this option if your application needs a small number of custom colors. On X11, this option is the same as NormalColor. On Windows, Qt creates a Windows palette, and allocates colors to it on demand. \i QApplication::ManyColor. Use this option if your application is very color hungry (e.g. it requires thousands of colors). Under X11 the effect is: \list \i For 256-color displays which have at best a 256 color true color visual, the default visual is used, and colors are allocated from a color cube. The color cube is the 6x6x6 (216 color) "Web palette"*, but the number of colors can be changed by the \e -ncols option. The user can force the application to use the true color visual with the \link QApplication::QApplication() -visual \endlink option. \i For 256-color displays which have a true color visual with more than 256 colors, use that visual. Silicon Graphics X servers have this feature, for example. They provide an 8 bit visual by default but can deliver true color when asked. \endlist On Windows, Qt creates a Windows palette, and fills it with a color cube. \endlist Be aware that the CustomColor and ManyColor choices may lead to colormap flashing: The foreground application gets (most) of the available colors, while the background windows will look less attractive. Example: \code int main( int argc, char **argv ) { QApplication::setColorSpec( QApplication::ManyColor ); QApplication a( argc, argv ); ... } \endcode QColor provides more functionality for controlling color allocation and freeing up certain colors. See QColor::enterAllocContext() for more information. To check what mode you end up with, call QColor::numBitPlanes() once the QApplication object exists. A value greater than 8 (typically 16, 24 or 32) means true color. * The color cube used by Qt has 216 colors whose red, green, and blue components always have one of the following values: 0x00, 0x33, 0x66, 0x99, 0xCC, or 0xFF. \sa colorSpec(), QColor::numBitPlanes(), QColor::enterAllocContext() */ void QApplication::setColorSpec( int spec ) { #if defined(QT_CHECK_STATE) if ( qApp ) { qWarning( "QApplication::setColorSpec: This function must be " "called before the QApplication object is created" ); } #endif app_cspec = spec; } /*! \fn QSize QApplication::globalStrut() Returns the application's global strut. The strut is a size object whose dimensions are the minimum that any GUI element that the user can interact with should have. For example no button should be resized to be smaller than the global strut size. \sa setGlobalStrut() */ /*! Sets the application's global strut to \a strut. The strut is a size object whose dimensions are the minimum that any GUI element that the user can interact with should have. For example no button should be resized to be smaller than the global strut size. The strut size should be considered when reimplementing GUI controls that may be used on touch-screens or similar IO-devices. Example: \code QSize& WidgetClass::sizeHint() const { return QSize( 80, 25 ).expandedTo( QApplication::globalStrut() ); } \endcode \sa globalStrut() */ void QApplication::setGlobalStrut( const QSize& strut ) { app_strut = strut; } #if defined( Q_WS_WIN ) || defined( Q_WS_MAC ) extern const char *qAppFileName(); #endif #ifndef QT_NO_DIR #ifndef Q_WS_WIN static QString resolveSymlinks( const QString& path, int depth = 0 ) { bool foundLink = FALSE; QString linkTarget; QString part = path; int slashPos = path.length(); // too deep; we give up if ( depth == 128 ) return QString::null; do { part = part.left( slashPos ); QFileInfo fileInfo( part ); if ( fileInfo.isSymLink() ) { foundLink = TRUE; linkTarget = fileInfo.readLink(); break; } } while ( (slashPos = part.findRev('/')) != -1 ); if ( foundLink ) { QString path2; if ( linkTarget[0] == '/' ) { path2 = linkTarget; if ( slashPos < (int) path.length() ) path2 += "/" + path.right( path.length() - slashPos - 1 ); } else { QString relPath; relPath = part.left( part.findRev('/') + 1 ) + linkTarget; if ( slashPos < (int) path.length() ) { if ( !linkTarget.endsWith( "/" ) ) relPath += "/"; relPath += path.right( path.length() - slashPos - 1 ); } path2 = QDir::current().absFilePath( relPath ); } path2 = QDir::cleanDirPath( path2 ); return resolveSymlinks( path2, depth + 1 ); } else { return path; } } #endif // Q_WS_WIN /*! Returns the directory that contains the application executable. For example, if you have installed Qt in the \c{C:\Trolltech\Qt} directory, and you run the \c{demo} example, this function will return "C:/Trolltech/Qt/examples/demo". On Mac OS X this will point to the directory actually containing the executable, which may be inside of an application bundle (if the application is bundled). \warning On Unix, this function assumes that argv[0] contains the file name of the executable (which it normally does). It also assumes that the current directory hasn't been changed by the application. \sa applicationFilePath() */ QString QApplication::applicationDirPath() { return QFileInfo( applicationFilePath() ).dirPath(); } /*! Returns the file path of the application executable. For example, if you have installed Qt in the \c{C:\Trolltech\Qt} directory, and you run the \c{demo} example, this function will return "C:/Trolltech/Qt/examples/demo/demo.exe". \warning On Unix, this function assumes that argv[0] contains the file name of the executable (which it normally does). It also assumes that the current directory hasn't been changed by the application. \sa applicationDirPath() */ QString QApplication::applicationFilePath() { #if defined( Q_WS_WIN ) QFileInfo filePath; QT_WA({ WCHAR module_name[256]; GetModuleFileNameW(0, module_name, sizeof(module_name)); filePath = QString::fromUcs2((const unsigned short *)module_name); }, { char module_name[256]; GetModuleFileNameA(0, module_name, sizeof(module_name)); filePath = QString::fromLocal8Bit(module_name); }); return filePath.filePath(); #elif defined( Q_WS_MAC ) return QDir::cleanDirPath( QFile::decodeName( qAppFileName() ) ); #else QString argv0 = QFile::decodeName( argv()[0] ); QString absPath; if ( argv0[0] == '/' ) { /* If argv0 starts with a slash, it is already an absolute file path. */ absPath = argv0; } else if ( argv0.find('/') != -1 ) { /* If argv0 contains one or more slashes, it is a file path relative to the current directory. */ absPath = QDir::current().absFilePath( argv0 ); } else { /* Otherwise, the file path has to be determined using the PATH environment variable. */ char *pEnv = getenv( "PATH" ); QStringList paths( QStringList::split(QChar(':'), pEnv) ); QStringList::const_iterator p = paths.begin(); while ( p != paths.end() ) { QString candidate = QDir::current().absFilePath( *p + "/" + argv0 ); if ( QFile::exists(candidate) ) { absPath = candidate; break; } ++p; } } absPath = QDir::cleanDirPath( absPath ); if ( QFile::exists(absPath) ) { return resolveSymlinks( absPath ); } else { return QString::null; } #endif } #endif // QT_NO_DIR #ifndef QT_NO_COMPONENT /*! Returns a list of paths that the application will search when dynamically loading libraries. The installation directory for plugins is the only entry if no paths have been set. The default installation directory for plugins is \c INSTALL/plugins, where \c INSTALL is the directory where Qt was installed. The directory of the application executable (NOT the working directory) is also added to the plugin paths. If you want to iterate over the list, you should iterate over a copy, e.g. \code QStringList list = app.libraryPaths(); QStringList::Iterator it = list.begin(); while( it != list.end() ) { myProcessing( *it ); ++it; } \endcode See the \link plugins-howto.html plugins documentation\endlink for a description of how the library paths are used. \sa setLibraryPaths(), addLibraryPath(), removeLibraryPath(), QLibrary */ QStringList QApplication::libraryPaths() { if ( !app_libpaths ) { app_libpaths = new QStringList; QString installPathPlugins = QString::fromLocal8Bit(qInstallPathPlugins()); if ( QFile::exists(installPathPlugins) ) { #ifdef Q_WS_WIN installPathPlugins.replace('\\', '/'); #endif app_libpaths->append(installPathPlugins); } QString app_location; if (qApp) app_location = qApp->applicationFilePath(); #ifdef Q_WS_WIN else { app_location = QString(qAppFileName()); app_location.replace('\\', '/'); } #endif if (!app_location.isEmpty()) { app_location.truncate( app_location.findRev( '/' ) ); if ( app_location != qInstallPathPlugins() && QFile::exists( app_location ) ) app_libpaths->append( app_location ); } } return *app_libpaths; } /*! Sets the list of directories to search when loading libraries to \a paths. All existing paths will be deleted and the path list will consist of the paths given in \a paths. \sa libraryPaths(), addLibraryPath(), removeLibraryPath(), QLibrary */ void QApplication::setLibraryPaths( const QStringList &paths ) { delete app_libpaths; app_libpaths = new QStringList( paths ); } /*! Append \a path to the end of the library path list. If \a path is empty or already in the path list, the path list is not changed. The default path list consists of a single entry, the installation directory for plugins. The default installation directory for plugins is \c INSTALL/plugins, where \c INSTALL is the directory where Qt was installed. \sa removeLibraryPath(), libraryPaths(), setLibraryPaths() */ void QApplication::addLibraryPath( const QString &path ) { if ( path.isEmpty() ) return; // make sure that library paths is initialized libraryPaths(); if ( !app_libpaths->contains( path ) ) app_libpaths->prepend( path ); } /*! Removes \a path from the library path list. If \a path is empty or not in the path list, the list is not changed. \sa addLibraryPath(), libraryPaths(), setLibraryPaths() */ void QApplication::removeLibraryPath( const QString &path ) { if ( path.isEmpty() ) return; // make sure that library paths is initialized libraryPaths(); if ( app_libpaths->contains( path ) ) app_libpaths->remove( path ); } #endif //QT_NO_COMPONENT /*! Returns the application palette. If a widget is passed in \a w, the default palette for the widget's class is returned. This may or may not be the application palette. In most cases there isn't a special palette for certain types of widgets, but one notable exception is the popup menu under Windows, if the user has defined a special background color for menus in the display settings. \sa setPalette(), QWidget::palette() */ #ifndef QT_NO_PALETTE QPalette QApplication::palette(const QWidget* w) { #if defined(QT_CHECK_STATE) if ( !qApp ) qWarning( "QApplication::palette: This function can only be " "called after the QApplication object has been created" ); #endif if ( !app_pal ) { if ( !qt_std_pal ) qt_create_std_palette(); app_pal = new QPalette( *qt_std_pal ); qt_fix_tooltips(); } if ( w && app_palettes ) { QPalette* wp = app_palettes->find( w->className() ); if ( wp ) return *wp; QAsciiDictIterator it( *app_palettes ); const char* name; while ( (name=it.currentKey()) != 0 ) { if ( w->inherits( name ) ) return *it.current(); ++it; } } return *app_pal; } /*! Changes the default application palette to \a palette. If \a informWidgets is TRUE, then existing widgets are informed about the change and may adjust themselves to the new application setting. If \a informWidgets is FALSE, the change only affects newly created widgets. If \a className is passed, the change applies only to widgets that inherit \a className (as reported by QObject::inherits()). If \a className is left 0, the change affects all widgets, thus overriding any previously set class specific palettes. The palette may be changed according to the current GUI style in QStyle::polish(). \sa QWidget::setPalette(), palette(), QStyle::polish() */ void QApplication::setPalette( const QPalette &palette, bool informWidgets, const char* className ) { QPalette pal = palette; QPalette *oldpal = 0; #ifndef QT_NO_STYLE if ( !startingUp() ) // on startup this has been done already qApp->style().polish( pal ); // NB: non-const reference #endif bool all = FALSE; if ( !className ) { if ( !app_pal ) { app_pal = new QPalette( pal ); Q_CHECK_PTR( app_pal ); } else { *app_pal = pal; } all = app_palettes != 0; delete app_palettes; app_palettes = 0; qt_fix_tooltips(); } else { if ( !app_palettes ) { app_palettes = new QAsciiDict; Q_CHECK_PTR( app_palettes ); app_palettes->setAutoDelete( TRUE ); } oldpal = app_palettes->find( className ); app_palettes->insert( className, new QPalette( pal ) ); } if ( informWidgets && is_app_running && !is_app_closing ) { if ( !oldpal || ( *oldpal != pal ) ) { QEvent e( QEvent::ApplicationPaletteChange ); QWidgetIntDictIt it( *((QWidgetIntDict*)QWidget::mapper) ); register QWidget *w; while ( (w=it.current()) ) { // for all widgets... ++it; if ( all || (!className && w->isTopLevel() ) || w->inherits(className) ) // matching class sendEvent( w, &e ); } } } } #endif // QT_NO_PALETTE /*! Returns the default font for the widget \a w, or the default application font if \a w is 0. \sa setFont(), fontMetrics(), QWidget::font() */ QFont QApplication::font( const QWidget *w ) { if ( w && app_fonts ) { QFont* wf = app_fonts->find( w->className() ); if ( wf ) return *wf; QAsciiDictIterator it( *app_fonts ); const char* name; while ( (name=it.currentKey()) != 0 ) { if ( w->inherits( name ) ) return *it.current(); ++it; } } if ( !app_font ) { app_font = new QFont( "Helvetica" ); Q_CHECK_PTR( app_font ); } return *app_font; } /*! Changes the default application font to \a font. If \a informWidgets is TRUE, then existing widgets are informed about the change and may adjust themselves to the new application setting. If \a informWidgets is FALSE, the change only affects newly created widgets. If \a className is passed, the change applies only to classes that inherit \a className (as reported by QObject::inherits()). On application start-up, the default font depends on the window system. It can vary depending on both the window system version and the locale. This function lets you override the default font; but overriding may be a bad idea because, for example, some locales need extra-large fonts to support their special characters. \sa font(), fontMetrics(), QWidget::setFont() */ void QApplication::setFont( const QFont &font, bool informWidgets, const char* className ) { bool all = FALSE; if ( !className ) { qt_app_has_font = TRUE; if ( !app_font ) { app_font = new QFont( font ); Q_CHECK_PTR( app_font ); } else { *app_font = font; } // make sure the application font is complete app_font->detach(); app_font->d->mask = QFontPrivate::Complete; all = app_fonts != 0; delete app_fonts; app_fonts = 0; } else { if (!app_fonts){ app_fonts = new QAsciiDict; Q_CHECK_PTR( app_fonts ); app_fonts->setAutoDelete( TRUE ); } QFont* fnt = new QFont(font); Q_CHECK_PTR( fnt ); app_fonts->insert(className, fnt); } if ( informWidgets && is_app_running && !is_app_closing ) { QEvent e( QEvent::ApplicationFontChange ); QWidgetIntDictIt it( *((QWidgetIntDict*)QWidget::mapper) ); register QWidget *w; while ( (w=it.current()) ) { // for all widgets... ++it; if ( all || (!className && w->isTopLevel() ) || w->inherits(className) ) // matching class sendEvent( w, &e ); } } } /*! Initialization of the appearance of the widget \a w \e before it is first shown. Usually widgets call this automatically when they are polished. It may be used to do some style-based central customization of widgets. Note that you are not limited to the public functions of QWidget. Instead, based on meta information like QObject::className() you are able to customize any kind of widget. \sa QStyle::polish(), QWidget::polish(), setPalette(), setFont() */ void QApplication::polish( QWidget *w ) { #ifndef QT_NO_STYLE w->style().polish( w ); #endif } /*! Returns a list of the top level widgets in the application. The list is created using \c new and must be deleted by the caller. The list is empty (QPtrList::isEmpty()) if there are no top level widgets. Note that some of the top level widgets may be hidden, for example the tooltip if no tooltip is currently shown. Example: \code // Show all hidden top level widgets. QWidgetList *list = QApplication::topLevelWidgets(); QWidgetListIt it( *list ); // iterate over the widgets QWidget * w; while ( (w=it.current()) != 0 ) { // for each top level widget... ++it; if ( !w->isVisible() ) w->show(); } delete list; // delete the list, not the widgets \endcode \warning Delete the list as soon you have finished using it. The widgets in the list may be deleted by someone else at any time. \sa allWidgets(), QWidget::isTopLevel(), QWidget::isVisible(), QPtrList::isEmpty() */ QWidgetList *QApplication::topLevelWidgets() { return QWidget::tlwList(); } /*! Returns a list of all the widgets in the application. The list is created using \c new and must be deleted by the caller. The list is empty (QPtrList::isEmpty()) if there are no widgets. Note that some of the widgets may be hidden. Example that updates all widgets: \code QWidgetList *list = QApplication::allWidgets(); QWidgetListIt it( *list ); // iterate over the widgets QWidget * w; while ( (w=it.current()) != 0 ) { // for each widget... ++it; w->update(); } delete list; // delete the list, not the widgets \endcode The QWidgetList class is defined in the \c qwidgetlist.h header file. \warning Delete the list as soon as you have finished using it. The widgets in the list may be deleted by someone else at any time. \sa topLevelWidgets(), QWidget::isVisible(), QPtrList::isEmpty(), */ QWidgetList *QApplication::allWidgets() { return QWidget::wList(); } /*! \fn QWidget *QApplication::focusWidget() const Returns the application widget that has the keyboard input focus, or 0 if no widget in this application has the focus. \sa QWidget::setFocus(), QWidget::hasFocus(), activeWindow() */ /*! \fn QWidget *QApplication::activeWindow() const Returns the application top-level window that has the keyboard input focus, or 0 if no application window has the focus. Note that there might be an activeWindow() even if there is no focusWidget(), for example if no widget in that window accepts key events. \sa QWidget::setFocus(), QWidget::hasFocus(), focusWidget() */ /*! Returns display (screen) font metrics for the application font. \sa font(), setFont(), QWidget::fontMetrics(), QPainter::fontMetrics() */ QFontMetrics QApplication::fontMetrics() { return desktop()->fontMetrics(); } /*! Tells the application to exit with return code 0 (success). Equivalent to calling QApplication::exit( 0 ). It's common to connect the lastWindowClosed() signal to quit(), and you also often connect e.g. QButton::clicked() or signals in QAction, QPopupMenu or QMenuBar to it. Example: \code QPushButton *quitButton = new QPushButton( "Quit" ); connect( quitButton, SIGNAL(clicked()), qApp, SLOT(quit()) ); \endcode \sa exit() aboutToQuit() lastWindowClosed() QAction */ void QApplication::quit() { QApplication::exit( 0 ); } /*! Closes all top-level windows. This function is particularly useful for applications with many top-level windows. It could, for example, be connected to a "Quit" entry in the file menu as shown in the following code example: \code // the "Quit" menu entry should try to close all windows QPopupMenu* file = new QPopupMenu( this ); file->insertItem( "&Quit", qApp, SLOT(closeAllWindows()), CTRL+Key_Q ); // when the last window is closed, the application should quit connect( qApp, SIGNAL( lastWindowClosed() ), qApp, SLOT( quit() ) ); \endcode The windows are closed in random order, until one window does not accept the close event. \sa QWidget::close(), QWidget::closeEvent(), lastWindowClosed(), quit(), topLevelWidgets(), QWidget::isTopLevel() */ void QApplication::closeAllWindows() { bool did_close = TRUE; QWidget *w; while((w = activeModalWidget()) && did_close) { if(w->isHidden()) break; did_close = w->close(); } QWidgetList *list = QApplication::topLevelWidgets(); for ( w = list->first(); did_close && w; ) { if ( !w->isHidden() ) { did_close = w->close(); delete list; list = QApplication::topLevelWidgets(); w = list->first(); } else { w = list->next(); } } delete list; } /*! Displays a simple message box about Qt. The message includes the version number of Qt being used by the application. This is useful for inclusion in the Help menu of an application. See the examples/menu/menu.cpp example. This function is a convenience slot for QMessageBox::aboutQt(). */ void QApplication::aboutQt() { #ifndef QT_NO_MESSAGEBOX QMessageBox::aboutQt( mainWidget() ); #endif // QT_NO_MESSAGEBOX } /*! \fn void QApplication::lastWindowClosed() This signal is emitted when the user has closed the last top level window. The signal is very useful when your application has many top level widgets but no main widget. You can then connect it to the quit() slot. For convenience, this signal is \e not emitted for transient top level widgets such as popup menus and dialogs. \sa mainWidget(), topLevelWidgets(), QWidget::isTopLevel(), QWidget::close() */ /*! \fn void QApplication::aboutToQuit() This signal is emitted when the application is about to quit the main event loop, e.g. when the event loop level drops to zero. This may happen either after a call to quit() from inside the application or when the users shuts down the entire desktop session. The signal is particularly useful if your application has to do some last-second cleanup. Note that no user interaction is possible in this state. \sa quit() */ /*! \fn void QApplication::guiThreadAwake() This signal is emitted after the event loop returns from a function that could block. \sa wakeUpGuiThread() */ /*! \fn bool QApplication::sendEvent( QObject *receiver, QEvent *event ) Sends event \a event directly to receiver \a receiver, using the notify() function. Returns the value that was returned from the event handler. The event is \e not deleted when the event has been sent. The normal approach is to create the event on the stack, e.g. \code QMouseEvent me( QEvent::MouseButtonPress, pos, 0, 0 ); QApplication::sendEvent( mainWindow, &me ); \endcode If you create the event on the heap you must delete it. \sa postEvent(), notify() */ /*! Sends event \a e to \a receiver: \a {receiver}->event(\a e). Returns the value that is returned from the receiver's event handler. For certain types of events (e.g. mouse and key events), the event will be propagated to the receiver's parent and so on up to the top-level object if the receiver is not interested in the event (i.e., it returns FALSE). There are five different ways that events can be processed; reimplementing this virtual function is just one of them. All five approaches are listed below: \list 1 \i Reimplementing this function. This is very powerful, providing complete control; but only one subclass can be qApp. \i Installing an event filter on qApp. Such an event filter is able to process all events for all widgets, so it's just as powerful as reimplementing notify(); furthermore, it's possible to have more than one application-global event filter. Global event filters even see mouse events for \link QWidget::isEnabled() disabled widgets, \endlink and if \link setGlobalMouseTracking() global mouse tracking \endlink is enabled, as well as mouse move events for all widgets. \i Reimplementing QObject::event() (as QWidget does). If you do this you get Tab key presses, and you get to see the events before any widget-specific event filters. \i Installing an event filter on the object. Such an event filter gets all the events except Tab and Shift-Tab key presses. \i Reimplementing paintEvent(), mousePressEvent() and so on. This is the commonest, easiest and least powerful way. \endlist \sa QObject::event(), installEventFilter() */ bool QApplication::notify( QObject *receiver, QEvent *e ) { // no events are delivered after ~QApplication() has started if ( is_app_closing ) return FALSE; if ( receiver == 0 ) { // serious error #if defined(QT_CHECK_NULL) qWarning( "QApplication::notify: Unexpected null receiver" ); #endif return FALSE; } if ( e->type() == QEvent::ChildRemoved && receiver->postedEvents && globalPostedEvents) { #ifdef QT_THREAD_SUPPORT QMutexLocker locker( postevent_mutex ); #endif // QT_THREAD_SUPPORT // the QObject destructor calls QObject::removeChild, which calls // QApplication::sendEvent() directly. this can happen while the event // loop is in the middle of posting events, and when we get here, we may // not have any more posted events for this object. if ( receiver->postedEvents ) { // if this is a child remove event and the child insert // hasn't been dispatched yet, kill that insert QPostEventList * l = receiver->postedEvents; QObject * c = ((QChildEvent*)e)->child(); QPostEvent * pe; l->first(); while( ( pe = l->current()) != 0 ) { if ( pe->event && pe->receiver == receiver && pe->event->type() == QEvent::ChildInserted && ((QChildEvent*)pe->event)->child() == c ) { pe->event->posted = FALSE; delete pe->event; pe->event = 0; l->remove(); continue; } l->next(); } } } bool res = FALSE; if ( !receiver->isWidgetType() ) res = internalNotify( receiver, e ); else switch ( e->type() ) { #ifndef QT_NO_ACCEL case QEvent::Accel: { QKeyEvent* key = (QKeyEvent*) e; res = internalNotify( receiver, e ); if ( !res && !key->isAccepted() ) res = qt_dispatchAccelEvent( (QWidget*)receiver, key ); // next lines are for compatibility with Qt <= 3.0.x: old // QAccel was listening on toplevel widgets if ( !res && !key->isAccepted() && !((QWidget*)receiver)->isTopLevel() ) res = internalNotify( ((QWidget*)receiver)->topLevelWidget(), e ); } break; #endif //QT_NO_ACCEL case QEvent::KeyPress: case QEvent::KeyRelease: case QEvent::AccelOverride: { QWidget* w = (QWidget*)receiver; QKeyEvent* key = (QKeyEvent*) e; #ifndef QT_NO_ACCEL if ( qt_tryComposeUnicode( w, key ) ) break; #endif bool def = key->isAccepted(); while ( w ) { if ( def ) key->accept(); else key->ignore(); res = internalNotify( w, e ); if ( res || key->isAccepted() ) break; w = w->parentWidget( TRUE ); } } break; case QEvent::MouseButtonPress: if ( e->spontaneous() ) { QWidget* fw = (QWidget*)receiver; while ( fw->focusProxy() ) fw = fw->focusProxy(); if ( fw->isEnabled() && fw->focusPolicy() & QWidget::ClickFocus ) { QFocusEvent::setReason( QFocusEvent::Mouse); fw->setFocus(); QFocusEvent::resetReason(); } } // fall through intended case QEvent::MouseButtonRelease: case QEvent::MouseButtonDblClick: case QEvent::MouseMove: { QWidget* w = (QWidget*)receiver; QMouseEvent* mouse = (QMouseEvent*) e; QPoint relpos = mouse->pos(); while ( w ) { QMouseEvent me(mouse->type(), relpos, mouse->globalPos(), mouse->button(), mouse->state()); me.spont = mouse->spontaneous(); res = internalNotify( w, w == receiver ? mouse : &me ); e->spont = FALSE; if (res || w->isTopLevel() || w->testWFlags(WNoMousePropagation)) break; relpos += w->pos(); w = w->parentWidget(); } if ( res ) mouse->accept(); else mouse->ignore(); } break; #ifndef QT_NO_WHEELEVENT case QEvent::Wheel: { if ( e->spontaneous() ) { QWidget* fw = (QWidget*)receiver; while ( fw->focusProxy() ) fw = fw->focusProxy(); if ( fw->isEnabled() && (fw->focusPolicy() & QWidget::WheelFocus) == QWidget::WheelFocus ) { QFocusEvent::setReason( QFocusEvent::Mouse); fw->setFocus(); QFocusEvent::resetReason(); } } QWidget* w = (QWidget*)receiver; QWheelEvent* wheel = (QWheelEvent*) e; QPoint relpos = wheel->pos(); while ( w ) { QWheelEvent we(relpos, wheel->globalPos(), wheel->delta(), wheel->state(), wheel->orientation()); we.spont = wheel->spontaneous(); res = internalNotify( w, w == receiver ? wheel : &we ); e->spont = FALSE; if (res || w->isTopLevel() || w->testWFlags(WNoMousePropagation)) break; relpos += w->pos(); w = w->parentWidget(); } if ( res ) wheel->accept(); else wheel->ignore(); } break; #endif case QEvent::ContextMenu: { QWidget* w = (QWidget*)receiver; QContextMenuEvent *context = (QContextMenuEvent*) e; QPoint relpos = context->pos(); while ( w ) { QContextMenuEvent ce(context->reason(), relpos, context->globalPos(), context->state()); ce.spont = e->spontaneous(); res = internalNotify( w, w == receiver ? context : &ce ); e->spont = FALSE; if (res || w->isTopLevel() || w->testWFlags(WNoMousePropagation)) break; relpos += w->pos(); w = w->parentWidget(); } if ( res ) context->accept(); else context->ignore(); } break; #if defined (QT_TABLET_SUPPORT) case QEvent::TabletMove: case QEvent::TabletPress: case QEvent::TabletRelease: { QWidget *w = (QWidget*)receiver; QTabletEvent *tablet = (QTabletEvent*)e; QPoint relpos = tablet->pos(); while ( w ) { QTabletEvent te(tablet->pos(), tablet->globalPos(), tablet->device(), tablet->pressure(), tablet->xTilt(), tablet->yTilt(), tablet->uniqueId()); te.spont = e->spontaneous(); res = internalNotify( w, w == receiver ? tablet : &te ); e->spont = FALSE; if (res || w->isTopLevel() || w->testWFlags(WNoMousePropagation)) break; relpos += w->pos(); w = w->parentWidget(); } if ( res ) tablet->accept(); else tablet->ignore(); chokeMouse = tablet->isAccepted(); } break; #endif default: res = internalNotify( receiver, e ); break; } return res; } /*!\reimp */ bool QApplication::event( QEvent *e ) { if(e->type() == QEvent::Close) { QCloseEvent *ce = (QCloseEvent*)e; ce->accept(); closeAllWindows(); QWidgetList *list = topLevelWidgets(); for(QWidget *w = list->first(); w; w = list->next()) { if ( !w->isHidden() && !w->isDesktop() && !w->isPopup() && (!w->isDialog() || !w->parentWidget())) { ce->ignore(); break; } } if(ce->isAccepted()) return TRUE; } else if (e->type() == QEvent::Quit) { quit(); return TRUE; } return QObject::event(e); } #define HOVER_SENSITIVE_WIDGET_SELECT if ( widget->inherits("QPushButton") \ || widget->inherits("QComboBox") \ || widget->inherits("QSpinWidget") \ || widget->inherits("QCheckBox") \ || widget->inherits("QRadioButton") \ || widget->inherits("QToolButton") \ || widget->inherits("QSlider") \ || widget->inherits("QScrollBar") \ || widget->inherits("QTabBar") \ || widget->inherits("QDockWindowHandle") \ || widget->inherits("QSplitterHandle") ) #define FOCUS_SENSITIVE_WIDGET_SELECT if ( widget->inherits("QLineEdit") ) #define FOCUS_SENSITIVE_PARENT_WIDGET_SELECT if ( widget->parentWidget() && widget->parentWidget()->inherits("QSpinWidget") ) /*!\internal Helper function called by notify() */ bool QApplication::internalNotify( QObject *receiver, QEvent * e) { if ( eventFilters ) { QObjectListIt it( *eventFilters ); register QObject *obj; while ( (obj=it.current()) != 0 ) { // send to all filters ++it; // until one returns TRUE if ( obj->eventFilter(receiver,e) ) return TRUE; } } bool consumed = FALSE; bool handled = FALSE; if ( receiver->isWidgetType() ) { QWidget *widget = (QWidget*)receiver; // toggle HasMouse widget state on enter and leave if ( e->type() == QEvent::Enter || e->type() == QEvent::DragEnter ) { widget->setWState( WState_HasMouse ); HOVER_SENSITIVE_WIDGET_SELECT { widget->repaint(false); } } else if ( e->type() == QEvent::Leave || e->type() == QEvent::DragLeave ) { widget->clearWState( WState_HasMouse ); HOVER_SENSITIVE_WIDGET_SELECT { widget->repaint(false); } } // repaint information entry widgets on focus set/unset if ( e->type() == QEvent::FocusIn || e->type() == QEvent::FocusOut ) { FOCUS_SENSITIVE_WIDGET_SELECT { widget->repaint(false); } FOCUS_SENSITIVE_PARENT_WIDGET_SELECT { widget->parentWidget()->repaint(false); } } // throw away any mouse-tracking-only mouse events if ( e->type() == QEvent::MouseMove && (((QMouseEvent*)e)->state()&QMouseEvent::MouseButtonMask) == 0 && !widget->hasMouseTracking() ) { handled = TRUE; consumed = TRUE; } else if ( !widget->isEnabled() ) { // throw away mouse events to disabled widgets switch(e->type()) { case QEvent::MouseButtonPress: case QEvent::MouseButtonRelease: case QEvent::MouseButtonDblClick: case QEvent::MouseMove: ( (QMouseEvent*) e)->ignore(); handled = TRUE; consumed = TRUE; break; #ifndef QT_NO_DRAGANDDROP case QEvent::DragEnter: case QEvent::DragMove: ( (QDragMoveEvent*) e)->ignore(); handled = TRUE; break; case QEvent::DragLeave: case QEvent::DragResponse: handled = TRUE; break; case QEvent::Drop: ( (QDropEvent*) e)->ignore(); handled = TRUE; break; #endif #ifndef QT_NO_WHEELEVENT case QEvent::Wheel: ( (QWheelEvent*) e)->ignore(); handled = TRUE; break; #endif case QEvent::ContextMenu: ( (QContextMenuEvent*) e)->ignore(); handled = TRUE; break; default: break; } } } if (!handled) consumed = receiver->event( e ); e->spont = FALSE; return consumed; } /*! Returns TRUE if an application object has not been created yet; otherwise returns FALSE. \sa closingDown() */ bool QApplication::startingUp() { return !is_app_running; } /*! Returns TRUE if the application objects are being destroyed; otherwise returns FALSE. \sa startingUp() */ bool QApplication::closingDown() { return is_app_closing; } /*! Processes pending events, for 3 seconds or until there are no more events to process, whichever is shorter. You can call this function occasionally when your program is busy performing a long operation (e.g. copying a file). \sa exec(), QTimer, QEventLoop::processEvents() */ void QApplication::processEvents() { processEvents( 3000 ); } /*! \overload Processes pending events for \a maxtime milliseconds or until there are no more events to process, whichever is shorter. You can call this function occasionally when you program is busy doing a long operation (e.g. copying a file). \sa exec(), QTimer, QEventLoop::processEvents() */ void QApplication::processEvents( int maxtime ) { eventLoop()->processEvents( QEventLoop::AllEvents, maxtime ); } /*! \obsolete Waits for an event to occur, processes it, then returns. This function is useful for adapting Qt to situations where the event processing must be grafted onto existing program loops. Using this function in new applications may be an indication of design problems. \sa processEvents(), exec(), QTimer */ void QApplication::processOneEvent() { eventLoop()->processEvents( QEventLoop::AllEvents | QEventLoop::WaitForMore ); } /***************************************************************************** Main event loop wrappers *****************************************************************************/ /*! Returns the application event loop. This function will return zero if called during and after destroying QApplication. To create your own instance of QEventLoop or QEventLoop subclass create it before you create the QApplication object. \sa QEventLoop */ QEventLoop *QApplication::eventLoop() { if ( !eventloop && !is_app_closing ) (void) new QEventLoop( qApp, "default event loop" ); return eventloop; } /*! Enters the main event loop and waits until exit() is called or the main widget is destroyed, and returns the value that was set to exit() (which is 0 if exit() is called via quit()). It is necessary to call this function to start event handling. The main event loop receives events from the window system and dispatches these to the application widgets. Generally speaking, no user interaction can take place before calling exec(). As a special case, modal widgets like QMessageBox can be used before calling exec(), because modal widgets call exec() to start a local event loop. To make your application perform idle processing, i.e. executing a special function whenever there are no pending events, use a QTimer with 0 timeout. More advanced idle processing schemes can be achieved using processEvents(). \sa quit(), exit(), processEvents(), setMainWidget() */ int QApplication::exec() { return eventLoop()->exec(); } /*! Tells the application to exit with a return code. After this function has been called, the application leaves the main event loop and returns from the call to exec(). The exec() function returns \a retcode. By convention, a \a retcode of 0 means success, and any non-zero value indicates an error. Note that unlike the C library function of the same name, this function \e does return to the caller -- it is event processing that stops. \sa quit(), exec() */ void QApplication::exit( int retcode ) { qApp->eventLoop()->exit( retcode ); } /*! \obsolete This function enters the main event loop (recursively). Do not call it unless you really know what you are doing. Use QApplication::eventLoop()->enterLoop() instead. */ int QApplication::enter_loop() { return eventLoop()->enterLoop(); } /*! \obsolete This function exits from a recursive call to the main event loop. Do not call it unless you are an expert. Use QApplication::eventLoop()->exitLoop() instead. */ void QApplication::exit_loop() { eventLoop()->exitLoop(); } /*! \obsolete Returns the current loop level. Use QApplication::eventLoop()->loopLevel() instead. */ int QApplication::loopLevel() const { return eventLoop()->loopLevel(); } /*! Wakes up the GUI thread. \sa guiThreadAwake() \link threads.html Thread Support in Qt\endlink */ void QApplication::wakeUpGuiThread() { eventLoop()->wakeUp(); } /*! This function returns TRUE if there are pending events; otherwise returns FALSE. Pending events can be either from the window system or posted events using QApplication::postEvent(). */ bool QApplication::hasPendingEvents() { return eventLoop()->hasPendingEvents(); } #if !defined(Q_WS_X11) // The doc and X implementation of these functions is in qapplication_x11.cpp void QApplication::flushX() {} // do nothing void QApplication::syncX() {} // do nothing #endif /*! \fn void QApplication::setWinStyleHighlightColor( const QColor & ) \obsolete Sets the color used to mark selections in windows style for all widgets in the application. Will repaint all widgets if the color is changed. The default color is \c darkBlue. \sa winStyleHighlightColor() */ /*! \fn const QColor& QApplication::winStyleHighlightColor() \obsolete Returns the color used to mark selections in windows style. \sa setWinStyleHighlightColor() */ /*! Returns the version of the Windows operating system that is running: \list \i Qt::WV_95 - Windows 95 \i Qt::WV_98 - Windows 98 \i Qt::WV_Me - Windows Me \i Qt::WV_NT - Windows NT 4.x \i Qt::WV_2000 - Windows 2000 (NT5) \i Qt::WV_XP - Windows XP \i Qt::WV_2003 - Windows Server 2003 family \i Qt::WV_CE - Windows CE \i Qt::WV_CENET - Windows CE.NET \endlist Note that this function is implemented for the Windows version of Qt only. */ #if defined(Q_OS_CYGWIN) Qt::WindowsVersion QApplication::winVersion() { return qt_winver; } #endif #ifndef QT_NO_TRANSLATION bool qt_detectRTLLanguage() { return QApplication::tr( "QT_LAYOUT_DIRECTION", "Translate this string to the string 'LTR' in left-to-right" " languages or to 'RTL' in right-to-left languages (such as Hebrew" " and Arabic) to get proper widget layout." ) == "RTL"; } /*! Adds the message file \a mf to the list of message files to be used for translations. Multiple message files can be installed. Translations are searched for in the last installed message file, then the one from last, and so on, back to the first installed message file. The search stops as soon as a matching translation is found. \sa removeTranslator() translate() QTranslator::load() */ void QApplication::installTranslator( QTranslator * mf ) { if ( !mf ) return; if ( !translators ) translators = new QValueList; translators->prepend( mf ); #ifndef QT_NO_TRANSLATION_BUILDER if ( mf->isEmpty() ) return; #endif // hook to set the layout direction of dialogs setReverseLayout( qt_detectRTLLanguage() ); QWidgetList *list = topLevelWidgets(); QWidgetListIt it( *list ); QWidget *w; while ( ( w=it.current() ) != 0 ) { ++it; if (!w->isDesktop()) postEvent( w, new QEvent( QEvent::LanguageChange ) ); } delete list; } /*! Removes the message file \a mf from the list of message files used by this application. (It does not delete the message file from the file system.) \sa installTranslator() translate(), QObject::tr() */ void QApplication::removeTranslator( QTranslator * mf ) { if ( !translators || !mf ) return; if ( translators->remove( mf ) && ! qApp->closingDown() ) { setReverseLayout( qt_detectRTLLanguage() ); QWidgetList *list = topLevelWidgets(); QWidgetListIt it( *list ); QWidget *w; while ( ( w=it.current() ) != 0 ) { ++it; postEvent( w, new QEvent( QEvent::LanguageChange ) ); } delete list; } } #ifndef QT_NO_TEXTCODEC /*! \obsolete This is the same as QTextCodec::setCodecForTr(). */ void QApplication::setDefaultCodec( QTextCodec* codec ) { QTextCodec::setCodecForTr( codec ); } /*! \obsolete Returns QTextCodec::codecForTr(). */ QTextCodec* QApplication::defaultCodec() const { return QTextCodec::codecForTr(); } #endif //QT_NO_TEXTCODEC /*! \enum QApplication::Encoding This enum type defines the 8-bit encoding of character string arguments to translate(): \value DefaultCodec - the encoding specified by QTextCodec::codecForTr() (Latin-1 if none has been set) \value UnicodeUTF8 - UTF-8 \sa QObject::tr(), QObject::trUtf8(), QString::fromUtf8() */ /*! \reentrant Returns the translation text for \a sourceText, by querying the installed messages files. The message files are searched from the most recently installed message file back to the first installed message file. QObject::tr() and QObject::trUtf8() provide this functionality more conveniently. \a context is typically a class name (e.g., "MyDialog") and \a sourceText is either English text or a short identifying text, if the output text will be very long (as for help texts). \a comment is a disambiguating comment, for when the same \a sourceText is used in different roles within the same context. By default, it is null. \a encoding indicates the 8-bit encoding of character stings See the \l QTranslator documentation for more information about contexts and comments. If none of the message files contain a translation for \a sourceText in \a context, this function returns a QString equivalent of \a sourceText. The encoding of \a sourceText is specified by \e encoding; it defaults to \c DefaultCodec. This function is not virtual. You can use alternative translation techniques by subclassing \l QTranslator. \warning This method is reentrant only if all translators are installed \e before calling this method. Installing or removing translators while performing translations is not supported. Doing so will most likely result in crashes or other undesirable behavior. \sa QObject::tr() installTranslator() defaultCodec() */ QString QApplication::translate( const char * context, const char * sourceText, const char * comment, Encoding encoding ) const { if ( !sourceText ) return QString::null; if ( translators ) { QValueList::iterator it; QTranslator * mf; QString result; for ( it = translators->begin(); it != translators->end(); ++it ) { mf = *it; result = mf->findMessage( context, sourceText, comment ).translation(); if ( !result.isNull() ) return result; } } #ifndef QT_NO_TEXTCODEC if ( encoding == UnicodeUTF8 ) return QString::fromUtf8( sourceText ); else if ( QTextCodec::codecForTr() != 0 ) return QTextCodec::codecForTr()->toUnicode( sourceText ); else #endif return QString::fromLatin1( sourceText ); } #endif /***************************************************************************** QApplication management of posted events *****************************************************************************/ //see also notify(), which does the removal of ChildInserted when ChildRemoved. /*! Adds the event \a event with the object \a receiver as the receiver of the event, to an event queue and returns immediately. The event must be allocated on the heap since the post event queue will take ownership of the event and delete it once it has been posted. When control returns to the main event loop, all events that are stored in the queue will be sent using the notify() function. \threadsafe \sa sendEvent(), notify() */ void QApplication::postEvent( QObject *receiver, QEvent *event ) { if ( receiver == 0 ) { #if defined(QT_CHECK_NULL) qWarning( "QApplication::postEvent: Unexpected null receiver" ); #endif delete event; return; } #ifdef QT_THREAD_SUPPORT QMutexLocker locker( postevent_mutex ); #endif // QT_THREAD_SUPPORT if ( !globalPostedEvents ) { // create list globalPostedEvents = new QPostEventList; Q_CHECK_PTR( globalPostedEvents ); globalPostedEvents->setAutoDelete( TRUE ); qapp_cleanup_events.set( &globalPostedEvents ); } if ( !receiver->postedEvents ) receiver->postedEvents = new QPostEventList; QPostEventList * l = receiver->postedEvents; // if this is one of the compressible events, do compression if ( event->type() == QEvent::Paint || event->type() == QEvent::LayoutHint || event->type() == QEvent::Resize || event->type() == QEvent::Move || event->type() == QEvent::LanguageChange ) { l->first(); QPostEvent * cur = 0; for ( ;; ) { while ( (cur=l->current()) != 0 && ( cur->receiver != receiver || cur->event == 0 || cur->event->type() != event->type() ) ) l->next(); if ( l->current() != 0 ) { if ( cur->event->type() == QEvent::Paint ) { QPaintEvent * p = (QPaintEvent*)(cur->event); if ( p->erase != ((QPaintEvent*)event)->erase ) { l->next(); continue; } p->reg = p->reg.unite( ((QPaintEvent *)event)->reg ); p->rec = p->rec.unite( ((QPaintEvent *)event)->rec ); delete event; return; } else if ( cur->event->type() == QEvent::LayoutHint ) { delete event; return; } else if ( cur->event->type() == QEvent::Resize ) { ((QResizeEvent *)(cur->event))->s = ((QResizeEvent *)event)->s; delete event; return; } else if ( cur->event->type() == QEvent::Move ) { ((QMoveEvent *)(cur->event))->p = ((QMoveEvent *)event)->p; delete event; return; } else if ( cur->event->type() == QEvent::LanguageChange ) { delete event; return; } } break; }; } #if !defined(QT_NO_IM) // if this is one of the compressible IM events, do compression else if ( event->type() == QEvent::IMCompose ) { l->last(); QPostEvent * cur = 0; for ( ;; ) { while ( (cur=l->current()) != 0 && ( cur->receiver != receiver || cur->event == 0 || cur->event->type() != event->type() || cur->event->type() != QEvent::IMStart ) ) l->prev(); if ( l->current() != 0 ) { // IMCompose must not be compressed with another one // beyond its IMStart boundary if ( cur->event->type() == QEvent::IMStart ) { break; } else if ( cur->event->type() == QEvent::IMCompose ) { QIMComposeEvent * e = (QIMComposeEvent *)(cur->event); *e = *(QIMComposeEvent *)event; delete event; return; } } break; }; } #endif // if no compression could be done, just append something event->posted = TRUE; QPostEvent * pe = new QPostEvent( receiver, event ); l->append( pe ); globalPostedEvents->append( pe ); if (eventloop) eventloop->wakeUp(); } /*! \overload Dispatches all posted events, i.e. empties the event queue. */ void QApplication::sendPostedEvents() { sendPostedEvents( 0, 0 ); } /*! Immediately dispatches all events which have been previously queued with QApplication::postEvent() and which are for the object \a receiver and have the event type \a event_type. Note that events from the window system are \e not dispatched by this function, but by processEvents(). If \a receiver is null, the events of \a event_type are sent for all objects. If \a event_type is 0, all the events are sent for \a receiver. */ void QApplication::sendPostedEvents( QObject *receiver, int event_type ) { // Make sure the object hierarchy is stable before processing events // to avoid endless loops if ( receiver == 0 && event_type == 0 ) sendPostedEvents( 0, QEvent::ChildInserted ); if ( !globalPostedEvents || ( receiver && !receiver->postedEvents ) ) return; #ifdef QT_THREAD_SUPPORT QMutexLocker locker( postevent_mutex ); #endif bool sent = TRUE; while ( sent ) { sent = FALSE; if ( !globalPostedEvents || ( receiver && !receiver->postedEvents ) ) return; // if we have a receiver, use the local list. Otherwise, use the // global list QPostEventList * l = receiver ? receiver->postedEvents : globalPostedEvents; // okay. here is the tricky loop. be careful about optimizing // this, it looks the way it does for good reasons. QPostEventListIt it( *l ); QPostEvent *pe; while ( (pe=it.current()) != 0 ) { ++it; if ( pe->event // hasn't been sent yet && ( receiver == 0 // we send to all receivers || receiver == pe->receiver ) // we send to THAT receiver && ( event_type == 0 // we send all types || event_type == pe->event->type() ) ) { // we send THAT type // first, we diddle the event so that we can deliver // it, and that noone will try to touch it later. pe->event->posted = FALSE; QEvent * e = pe->event; QObject * r = pe->receiver; pe->event = 0; // next, update the data structure so that we're ready // for the next event. // look for the local list, and take whatever we're // delivering out of it. r->postedEvents maybe *l if ( r->postedEvents ) { r->postedEvents->removeRef( pe ); // if possible, get rid of that list. this is not // ideal - we will create and delete a list for // each update() call. it would be better if we'd // leave the list empty here, and delete it // somewhere else if it isn't being used. if ( r->postedEvents->isEmpty() ) { delete r->postedEvents; r->postedEvents = 0; } } #ifdef QT_THREAD_SUPPORT if ( locker.mutex() ) locker.mutex()->unlock(); #endif // QT_THREAD_SUPPORT // after all that work, it's time to deliver the event. if ( e->type() == QEvent::Paint && r->isWidgetType() ) { QWidget * w = (QWidget*)r; QPaintEvent * p = (QPaintEvent*)e; if ( w->isVisible() ) w->repaint( p->reg, p->erase ); } else { sent = TRUE; QApplication::sendEvent( r, e ); } #ifdef QT_THREAD_SUPPORT if ( locker.mutex() ) locker.mutex()->lock(); #endif // QT_THREAD_SUPPORT delete e; // careful when adding anything below this point - the // sendEvent() call might invalidate any invariants this // function depends on. } } // clear the global list, i.e. remove everything that was // delivered. if ( l == globalPostedEvents ) { globalPostedEvents->first(); while( (pe=globalPostedEvents->current()) != 0 ) { if ( pe->event ) globalPostedEvents->next(); else globalPostedEvents->remove(); } } } } /*! Removes all events posted using postEvent() for \a receiver. The events are \e not dispatched, instead they are removed from the queue. You should never need to call this function. If you do call it, be aware that killing events may cause \a receiver to break one or more invariants. \threadsafe */ void QApplication::removePostedEvents( QObject *receiver ) { removePostedEvents( receiver, 0 ); } /*! Removes all events that have the event type \a event_type posted using postEvent() for \a receiver. The events are \e not dispatched, instead they are removed from the queue. If \a event_type is 0, all the events are removed from the queue. \threadsafe */ void QApplication::removePostedEvents( QObject *receiver, int event_type ) { if ( !receiver ) return; #ifdef QT_THREAD_SUPPORT QMutexLocker locker( postevent_mutex ); #endif // QT_THREAD_SUPPORT // the QObject destructor calls this function directly. this can // happen while the event loop is in the middle of posting events, // and when we get here, we may not have any more posted events // for this object. if ( !receiver->postedEvents ) return; // iterate over the object-specifc list and delete the events. // leave the QPostEvent objects; they'll be deleted by // sendPostedEvents(). QPostEventList * l = receiver->postedEvents; l->first(); QPostEvent * pe; while( (pe=l->current()) != 0 ) { if ( !event_type || pe->event->type() == event_type ) { if ( pe->event ) { pe->event->posted = FALSE; delete pe->event; pe->event = 0; } l->remove(); } else { l->next(); } } if ( !event_type || !l->count() ) { receiver->postedEvents = 0; delete l; } } /*! Removes \a event from the queue of posted events, and emits a warning message if appropriate. \warning This function can be \e really slow. Avoid using it, if possible. \threadsafe */ void QApplication::removePostedEvent( QEvent * event ) { if ( !event || !event->posted ) return; if ( !globalPostedEvents ) { #if defined(QT_DEBUG) qDebug( "QApplication::removePostedEvent: %p %d is posted: impossible", (void*)event, event->type() ); return; #endif } #ifdef QT_THREAD_SUPPORT QMutexLocker locker( postevent_mutex ); #endif // QT_THREAD_SUPPORT QPostEventListIt it( *globalPostedEvents ); QPostEvent * pe; while( (pe = it.current()) != 0 ) { ++it; if ( pe->event == event ) { #if defined(QT_DEBUG) const char *n; switch ( event->type() ) { case QEvent::Timer: n = "Timer"; break; case QEvent::MouseButtonPress: n = "MouseButtonPress"; break; case QEvent::MouseButtonRelease: n = "MouseButtonRelease"; break; case QEvent::MouseButtonDblClick: n = "MouseButtonDblClick"; break; case QEvent::MouseMove: n = "MouseMove"; break; #ifndef QT_NO_WHEELEVENT case QEvent::Wheel: n = "Wheel"; break; #endif case QEvent::KeyPress: n = "KeyPress"; break; case QEvent::KeyRelease: n = "KeyRelease"; break; case QEvent::FocusIn: n = "FocusIn"; break; case QEvent::FocusOut: n = "FocusOut"; break; case QEvent::Enter: n = "Enter"; break; case QEvent::Leave: n = "Leave"; break; case QEvent::Paint: n = "Paint"; break; case QEvent::Move: n = "Move"; break; case QEvent::Resize: n = "Resize"; break; case QEvent::Create: n = "Create"; break; case QEvent::Destroy: n = "Destroy"; break; case QEvent::Close: n = "Close"; break; case QEvent::Quit: n = "Quit"; break; default: n = ""; break; } qWarning("QEvent: Warning: %s event deleted while posted to %s %s", n, pe->receiver ? pe->receiver->className() : "null", pe->receiver ? pe->receiver->name() : "object" ); // note the beautiful uglehack if !pe->receiver :) #endif event->posted = FALSE; delete pe->event; pe->event = 0; return; } } } /*!\internal Sets the active window in reaction to a system event. Call this from the platform specific event handlers. It sets the activeWindow() and focusWidget() attributes and sends proper WindowActivate/WindowDeactivate and FocusIn/FocusOut events to all appropriate widgets. \sa activeWindow() */ void QApplication::setActiveWindow( QWidget* act ) { QWidget* window = act?act->topLevelWidget():0; if ( active_window == window ) return; // first the activation/deactivation events if ( active_window ) { QWidgetList deacts; #ifndef QT_NO_STYLE if ( style().styleHint(QStyle::SH_Widget_ShareActivation, active_window ) ) { QWidgetList *list = topLevelWidgets(); if ( list ) { for ( QWidget *w = list->first(); w; w = list->next() ) { if ( w->isVisible() && w->isActiveWindow() ) deacts.append(w); } delete list; } } else #endif deacts.append(active_window); active_window = 0; QEvent e( QEvent::WindowDeactivate ); for(QWidget *w = deacts.first(); w; w = deacts.next()) QApplication::sendSpontaneousEvent( w, &e ); } active_window = window; if ( active_window ) { QEvent e( QEvent::WindowActivate ); QWidgetList acts; #ifndef QT_NO_STYLE if ( style().styleHint(QStyle::SH_Widget_ShareActivation, active_window ) ) { QWidgetList *list = topLevelWidgets(); if ( list ) { for ( QWidget *w = list->first(); w; w = list->next() ) { if ( w->isVisible() && w->isActiveWindow() ) acts.append(w); } delete list; } } else #endif acts.append(active_window); for(QWidget *w = acts.first(); w; w = acts.next()) QApplication::sendSpontaneousEvent( w, &e ); } // then focus events QFocusEvent::setReason( QFocusEvent::ActiveWindow ); if ( !active_window && focus_widget ) { QFocusEvent out( QEvent::FocusOut ); QWidget *tmp = focus_widget; focus_widget = 0; #ifdef Q_WS_WIN QInputContext::accept( tmp ); #elif defined(Q_WS_X11) tmp->unfocusInputContext(); #endif QApplication::sendSpontaneousEvent( tmp, &out ); } else if ( active_window ) { QWidget *w = active_window->focusWidget(); if ( w && w->focusPolicy() != QWidget::NoFocus ) w->setFocus(); else active_window->focusNextPrevChild( TRUE ); } QFocusEvent::resetReason(); } /*!\internal Creates the proper Enter/Leave event when widget \a enter is entered and widget \a leave is left. */ Q_EXPORT void qt_dispatchEnterLeave( QWidget* enter, QWidget* leave ) { #if 0 if ( leave ) { QEvent e( QEvent::Leave ); QApplication::sendEvent( leave, & e ); } if ( enter ) { QEvent e( QEvent::Enter ); QApplication::sendEvent( enter, & e ); } return; #endif QWidget* w ; if ( !enter && !leave ) return; QWidgetList leaveList; QWidgetList enterList; bool sameWindow = leave && enter && leave->topLevelWidget() == enter->topLevelWidget(); if ( leave && !sameWindow ) { w = leave; do { leaveList.append( w ); } while ( (w = w->parentWidget( TRUE ) ) ); } if ( enter && !sameWindow ) { w = enter; do { enterList.prepend( w ); } while ( (w = w->parentWidget(TRUE) ) ); } if ( sameWindow ) { int enterDepth = 0; int leaveDepth = 0; w = enter; while ( ( w = w->parentWidget( TRUE ) ) ) enterDepth++; w = leave; while ( ( w = w->parentWidget( TRUE ) ) ) leaveDepth++; QWidget* wenter = enter; QWidget* wleave = leave; while ( enterDepth > leaveDepth ) { wenter = wenter->parentWidget(); enterDepth--; } while ( leaveDepth > enterDepth ) { wleave = wleave->parentWidget(); leaveDepth--; } while ( !wenter->isTopLevel() && wenter != wleave ) { wenter = wenter->parentWidget(); wleave = wleave->parentWidget(); } w = leave; while ( w != wleave ) { leaveList.append( w ); w = w->parentWidget(); } w = enter; while ( w != wenter ) { enterList.prepend( w ); w = w->parentWidget(); } } QEvent leaveEvent( QEvent::Leave ); for ( w = leaveList.first(); w; w = leaveList.next() ) { if ( !qApp->activeModalWidget() || qt_tryModalHelper( w, 0 )) QApplication::sendEvent( w, &leaveEvent ); } QEvent enterEvent( QEvent::Enter ); for ( w = enterList.first(); w; w = enterList.next() ) { if ( !qApp->activeModalWidget() || qt_tryModalHelper( w, 0 )) QApplication::sendEvent( w, &enterEvent ); } } #ifdef Q_WS_MACX extern QWidget *qt_tryModalHelperMac( QWidget * top ); //qapplication_mac.cpp #endif /*!\internal Called from qapplication_.cpp, returns TRUE if the widget should accept the event. */ Q_EXPORT bool qt_tryModalHelper( QWidget *widget, QWidget **rettop ) { QWidget *modal=0, *top=QApplication::activeModalWidget(); if ( rettop ) *rettop = top; if ( qApp->activePopupWidget() ) return TRUE; #ifdef Q_WS_MACX top = qt_tryModalHelperMac( top ); if ( rettop ) *rettop = top; #endif QWidget* groupLeader = widget; widget = widget->topLevelWidget(); if ( widget->testWFlags(Qt::WShowModal) ) // widget is modal modal = widget; if ( !top || modal == top ) // don't block event return TRUE; QWidget * p = widget->parentWidget(); // Check if the active modal widget is a parent of our widget while ( p ) { if ( p == top ) return TRUE; p = p->parentWidget(); } while ( groupLeader && !groupLeader->testWFlags( Qt::WGroupLeader ) ) groupLeader = groupLeader->parentWidget(); if ( groupLeader ) { // Does groupLeader have a child in qt_modal_stack? bool unrelated = TRUE; modal = qt_modal_stack->first(); while (modal && unrelated) { QWidget* p = modal->parentWidget(); while ( p && p != groupLeader && !p->testWFlags( Qt::WGroupLeader) ) { p = p->parentWidget(); } modal = qt_modal_stack->next(); if ( p == groupLeader ) unrelated = FALSE; } if ( unrelated ) return TRUE; // don't block event } return FALSE; } /*! Returns the desktop widget (also called the root window). The desktop widget is useful for obtaining the size of the screen. It may also be possible to draw on the desktop. We recommend against assuming that it's possible to draw on the desktop, since this does not work on all operating systems. \code QDesktopWidget *d = QApplication::desktop(); int w = d->width(); // returns desktop width int h = d->height(); // returns desktop height \endcode */ QDesktopWidget *QApplication::desktop() { if ( !qt_desktopWidget || // not created yet !qt_desktopWidget->isDesktop() ) { // reparented away qt_desktopWidget = new QDesktopWidget(); Q_CHECK_PTR( qt_desktopWidget ); } return qt_desktopWidget; } #ifndef QT_NO_CLIPBOARD /*! Returns a pointer to the application global clipboard. */ QClipboard *QApplication::clipboard() { if ( qt_clipboard == 0 ) { qt_clipboard = new QClipboard; Q_CHECK_PTR( qt_clipboard ); } return qt_clipboard; } #endif // QT_NO_CLIPBOARD /*! By default, Qt will try to use the current standard colors, fonts etc., from the underlying window system's desktop settings, and use them for all relevant widgets. This behavior can be switched off by calling this function with \a on set to FALSE. This static function must be called before creating the QApplication object, like this: \code int main( int argc, char** argv ) { QApplication::setDesktopSettingsAware( FALSE ); // I know better than the user QApplication myApp( argc, argv ); // Use default fonts & colors ... } \endcode \sa desktopSettingsAware() */ void QApplication::setDesktopSettingsAware( bool on ) { obey_desktop_settings = on; } /*! Returns the value set by setDesktopSettingsAware(); by default TRUE. \sa setDesktopSettingsAware() */ bool QApplication::desktopSettingsAware() { return obey_desktop_settings; } /*! \fn void QApplication::lock() Lock the Qt Library Mutex. If another thread has already locked the mutex, the calling thread will block until the other thread has unlocked the mutex. \sa unlock() locked() \link threads.html Thread Support in Qt\endlink */ /*! \fn void QApplication::unlock(bool wakeUpGui) Unlock the Qt Library Mutex. If \a wakeUpGui is TRUE (the default), then the GUI thread will be woken with QApplication::wakeUpGuiThread(). \sa lock(), locked() \link threads.html Thread Support in Qt\endlink */ /*! \fn bool QApplication::locked() Returns TRUE if the Qt Library Mutex is locked by a different thread; otherwise returns FALSE. \warning Due to different implementations of recursive mutexes on the supported platforms, calling this function from the same thread that previously locked the mutex will give undefined results. \sa lock() unlock() \link threads.html Thread Support in Qt\endlink */ /*! \fn bool QApplication::tryLock() Attempts to lock the Qt Library Mutex, and returns immediately. If the lock was obtained, this function returns TRUE. If another thread has locked the mutex, this function returns FALSE, instead of waiting for the lock to become available. The mutex must be unlocked with unlock() before another thread can successfully lock it. \sa lock(), unlock() \link threads.html Thread Support in Qt\endlink */ #if defined(QT_THREAD_SUPPORT) void QApplication::lock() { qt_mutex->lock(); } void QApplication::unlock(bool wakeUpGui) { qt_mutex->unlock(); if (wakeUpGui) wakeUpGuiThread(); } bool QApplication::locked() { return qt_mutex->locked(); } bool QApplication::tryLock() { return qt_mutex->tryLock(); } #endif /*! \fn bool QApplication::isSessionRestored() const Returns TRUE if the application has been restored from an earlier \link session.html session\endlink; otherwise returns FALSE. \sa sessionId(), commitData(), saveState() */ /*! \fn QString QApplication::sessionId() const Returns the current \link session.html session's\endlink identifier. If the application has been restored from an earlier session, this identifier is the same as it was in that previous session. The session identifier is guaranteed to be unique both for different applications and for different instances of the same application. \sa isSessionRestored(), sessionKey(), commitData(), saveState() */ /*! \fn QString QApplication::sessionKey() const Returns the session key in the current \link session.html session\endlink. If the application has been restored from an earlier session, this key is the same as it was when the previous session ended. The session key changes with every call of commitData() or saveState(). \sa isSessionRestored(), sessionId(), commitData(), saveState() */ /*! \fn void QApplication::commitData( QSessionManager& sm ) This function deals with \link session.html session management\endlink. It is invoked when the QSessionManager wants the application to commit all its data. Usually this means saving all open files, after getting permission from the user. Furthermore you may want to provide a means by which the user can cancel the shutdown. Note that you should not exit the application within this function. Instead, the session manager may or may not do this afterwards, depending on the context. \warning Within this function, no user interaction is possible, \e unless you ask the session manager \a sm for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details and example usage. The default implementation requests interaction and sends a close event to all visible top level widgets. If any event was rejected, the shutdown is canceled. \sa isSessionRestored(), sessionId(), saveState(), \link session.html the Session Management overview\endlink */ #ifndef QT_NO_SESSIONMANAGER void QApplication::commitData( QSessionManager& sm ) { if ( sm.allowsInteraction() ) { QWidgetList done; QWidgetList *list = QApplication::topLevelWidgets(); bool cancelled = FALSE; QWidget* w = list->first(); while ( !cancelled && w ) { if ( !w->isHidden() ) { QCloseEvent e; sendEvent( w, &e ); cancelled = !e.isAccepted(); if ( !cancelled ) done.append( w ); delete list; // one never knows... list = QApplication::topLevelWidgets(); w = list->first(); } else { w = list->next(); } while ( w && done.containsRef( w ) ) w = list->next(); } delete list; if ( cancelled ) sm.cancel(); } } /*! \fn void QApplication::saveState( QSessionManager& sm ) This function deals with \link session.html session management\endlink. It is invoked when the \link QSessionManager session manager \endlink wants the application to preserve its state for a future session. For example, a text editor would create a temporary file that includes the current contents of its edit buffers, the location of the cursor and other aspects of the current editing session. Note that you should never exit the application within this function. Instead, the session manager may or may not do this afterwards, depending on the context. Futhermore, most session managers will very likely request a saved state immediately after the application has been started. This permits the session manager to learn about the application's restart policy. \warning Within this function, no user interaction is possible, \e unless you ask the session manager \a sm for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details. \sa isSessionRestored(), sessionId(), commitData(), \link session.html the Session Management overview\endlink */ void QApplication::saveState( QSessionManager& /* sm */ ) { } #endif //QT_NO_SESSIONMANAGER /*! Sets the time after which a drag should start to \a ms ms. \sa startDragTime() */ void QApplication::setStartDragTime( int ms ) { drag_time = ms; } /*! If you support drag and drop in you application and a drag should start after a mouse click and after a certain time elapsed, you should use the value which this method returns as the delay (in ms). Qt also uses this delay internally, e.g. in QTextEdit and QLineEdit, for starting a drag. The default value is 500 ms. \sa setStartDragTime(), startDragDistance() */ int QApplication::startDragTime() { return drag_time; } /*! Sets the distance after which a drag should start to \a l pixels. \sa startDragDistance() */ void QApplication::setStartDragDistance( int l ) { drag_distance = l; } /*! If you support drag and drop in you application and a drag should start after a mouse click and after moving the mouse a certain distance, you should use the value which this method returns as the distance. For example, if the mouse position of the click is stored in \c startPos and the current position (e.g. in the mouse move event) is \c currPos, you can find out if a drag should be started with code like this: \code if ( ( startPos - currPos ).manhattanLength() > QApplication::startDragDistance() ) startTheDrag(); \endcode Qt uses this value internally, e.g. in QFileDialog. The default value is 4 pixels. \sa setStartDragDistance(), startDragTime(), QPoint::manhattanLength() */ int QApplication::startDragDistance() { return drag_distance; } /*! If \a b is TRUE, all dialogs and widgets will be laid out in a mirrored fashion, as required by right to left languages such as Arabic and Hebrew. If \a b is FALSE, dialogs and widgets are laid out left to right. Changing this flag in runtime does not cause a relayout of already instantiated widgets. \sa reverseLayout() */ void QApplication::setReverseLayout( bool b ) { if ( reverse_layout == b ) return; reverse_layout = b; QWidgetList *list = topLevelWidgets(); QWidgetListIt it( *list ); QWidget *w; while ( ( w=it.current() ) != 0 ) { ++it; postEvent( w, new QEvent( QEvent::LayoutDirectionChange ) ); } delete list; } /*! Returns TRUE if all dialogs and widgets will be laid out in a mirrored (right to left) fashion. Returns FALSE if dialogs and widgets will be laid out left to right. \sa setReverseLayout() */ bool QApplication::reverseLayout() { return reverse_layout; } /*! \class QSessionManager qsessionmanager.h \brief The QSessionManager class provides access to the session manager. \ingroup application \ingroup environment The session manager is responsible for session management, most importantly for interruption and resumption. A "session" is a kind of record of the state of the system, e.g. which applications were run at start up and which applications are currently running. The session manager is used to save the session, e.g. when the machine is shut down; and to restore a session, e.g. when the machine is started up. Use QSettings to save and restore an individual application's settings, e.g. window positions, recently used files, etc. QSessionManager provides an interface between the application and the session manager so that the program can work well with the session manager. In Qt, session management requests for action are handled by the two virtual functions QApplication::commitData() and QApplication::saveState(). Both provide a reference to a session manager object as argument, to allow the application to communicate with the session manager. During a session management action (i.e. within commitData() and saveState()), no user interaction is possible \e unless the application got explicit permission from the session manager. You ask for permission by calling allowsInteraction() or, if it's really urgent, allowsErrorInteraction(). Qt does not enforce this, but the session manager may. You can try to abort the shutdown process by calling cancel(). The default commitData() function does this if some top-level window rejected its closeEvent(). For sophisticated session managers provided on Unix/X11, QSessionManager offers further possibilites to fine-tune an application's session management behavior: setRestartCommand(), setDiscardCommand(), setRestartHint(), setProperty(), requestPhase2(). See the respective function descriptions for further details. */ /*! \enum QSessionManager::RestartHint This enum type defines the circumstances under which this application wants to be restarted by the session manager. The current values are \value RestartIfRunning if the application is still running when the session is shut down, it wants to be restarted at the start of the next session. \value RestartAnyway the application wants to be started at the start of the next session, no matter what. (This is useful for utilities that run just after startup and then quit.) \value RestartImmediately the application wants to be started immediately whenever it is not running. \value RestartNever the application does not want to be restarted automatically. The default hint is \c RestartIfRunning. */ /*! \fn QString QSessionManager::sessionId() const Returns the identifier of the current session. If the application has been restored from an earlier session, this identifier is the same as it was in that earlier session. \sa sessionKey(), QApplication::sessionId() */ /*! \fn QString QSessionManager::sessionKey() const Returns the session key in the current session. If the application has been restored from an earlier session, this key is the same as it was when the previous session ended. The session key changes with every call of commitData() or saveState(). \sa sessionId(), QApplication::sessionKey() */ // ### Note: This function is undocumented, since it is #ifdef'd. /*! \fn void* QSessionManager::handle() const X11 only: returns a handle to the current \c SmcConnection. */ /*! \fn bool QSessionManager::allowsInteraction() Asks the session manager for permission to interact with the user. Returns TRUE if interaction is permitted; otherwise returns FALSE. The rationale behind this mechanism is to make it possible to synchronize user interaction during a shutdown. Advanced session managers may ask all applications simultaneously to commit their data, resulting in a much faster shutdown. When the interaction is completed we strongly recommend releasing the user interaction semaphore with a call to release(). This way, other applications may get the chance to interact with the user while your application is still busy saving data. (The semaphore is implicitly released when the application exits.) If the user decides to cancel the shutdown process during the interaction phase, you must tell the session manager that this has happened by calling cancel(). Here's an example of how an application's QApplication::commitData() might be implemented: \code void MyApplication::commitData( QSessionManager& sm ) { if ( sm.allowsInteraction() ) { switch ( QMessageBox::warning( yourMainWindow, tr("Application Name"), tr("Save changes to document Foo?"), tr("&Yes"), tr("&No"), tr("Cancel"), 0, 2) ) { case 0: // yes sm.release(); // save document here; if saving fails, call sm.cancel() break; case 1: // continue without saving break; default: // cancel sm.cancel(); break; } } else { // we did not get permission to interact, then // do something reasonable instead. } } \endcode If an error occurred within the application while saving its data, you may want to try allowsErrorInteraction() instead. \sa QApplication::commitData(), release(), cancel() */ /*! \fn bool QSessionManager::allowsErrorInteraction() This is similar to allowsInteraction(), but also tells the session manager that an error occurred. Session managers may give error interaction request higher priority, which means that it is more likely that an error interaction is permitted. However, you are still not guaranteed that the session manager will allow interaction. \sa allowsInteraction(), release(), cancel() */ /*! \fn void QSessionManager::release() Releases the session manager's interaction semaphore after an interaction phase. \sa allowsInteraction(), allowsErrorInteraction() */ /*! \fn void QSessionManager::cancel() Tells the session manager to cancel the shutdown process. Applications should not call this function without first asking the user. \sa allowsInteraction(), allowsErrorInteraction() */ /*! \fn void QSessionManager::setRestartHint( RestartHint hint ) Sets the application's restart hint to \a hint. On application startup the hint is set to \c RestartIfRunning. Note that these flags are only hints, a session manager may or may not respect them. We recommend setting the restart hint in QApplication::saveState() because most session managers perform a checkpoint shortly after an application's startup. \sa restartHint() */ /*! \fn QSessionManager::RestartHint QSessionManager::restartHint() const Returns the application's current restart hint. The default is \c RestartIfRunning. \sa setRestartHint() */ /*! \fn void QSessionManager::setRestartCommand( const QStringList& command ) If the session manager is capable of restoring sessions it will execute \a command in order to restore the application. The command defaults to \code appname -session id \endcode The \c -session option is mandatory; otherwise QApplication cannot tell whether it has been restored or what the current session identifier is. See QApplication::isSessionRestored() and QApplication::sessionId() for details. If your application is very simple, it may be possible to store the entire application state in additional command line options. This is usually a very bad idea because command lines are often limited to a few hundred bytes. Instead, use QSettings, or temporary files or a database for this purpose. By marking the data with the unique sessionId(), you will be able to restore the application in a future session. \sa restartCommand(), setDiscardCommand(), setRestartHint() */ /*! \fn QStringList QSessionManager::restartCommand() const Returns the currently set restart command. Note that if you want to iterate over the list, you should iterate over a copy, e.g. \code QStringList list = mySession.restartCommand(); QStringList::Iterator it = list.begin(); while( it != list.end() ) { myProcessing( *it ); ++it; } \endcode \sa setRestartCommand(), restartHint() */ /*! \fn void QSessionManager::setDiscardCommand( const QStringList& ) \sa discardCommand(), setRestartCommand() */ /*! \fn QStringList QSessionManager::discardCommand() const Returns the currently set discard command. Note that if you want to iterate over the list, you should iterate over a copy, e.g. \code QStringList list = mySession.discardCommand(); QStringList::Iterator it = list.begin(); while( it != list.end() ) { myProcessing( *it ); ++it; } \endcode \sa setDiscardCommand(), restartCommand(), setRestartCommand() */ /*! \overload void QSessionManager::setManagerProperty( const QString& name, const QString& value ) Low-level write access to the application's identification and state records are kept in the session manager. The property called \a name has its value set to the string \a value. */ /*! \fn void QSessionManager::setManagerProperty( const QString& name, const QStringList& value ) Low-level write access to the application's identification and state record are kept in the session manager. The property called \a name has its value set to the string list \a value. */ /*! \fn bool QSessionManager::isPhase2() const Returns TRUE if the session manager is currently performing a second session management phase; otherwise returns FALSE. \sa requestPhase2() */ /*! \fn void QSessionManager::requestPhase2() Requests a second session management phase for the application. The application may then return immediately from the QApplication::commitData() or QApplication::saveState() function, and they will be called again once most or all other applications have finished their session management. The two phases are useful for applications such as the X11 window manager that need to store information about another application's windows and therefore have to wait until these applications have completed their respective session management tasks. Note that if another application has requested a second phase it may get called before, simultaneously with, or after your application's second phase. \sa isPhase2() */ /*! \fn int QApplication::horizontalAlignment( int align ) Strips out vertical alignment flags and transforms an alignment \a align of AlignAuto into AlignLeft or AlignRight according to the language used. The other horizontal alignment flags are left untouched. */ /***************************************************************************** Stubbed session management support *****************************************************************************/ #ifndef QT_NO_SESSIONMANAGER #if defined( QT_NO_SM_SUPPORT ) || defined( Q_WS_WIN ) || defined( Q_WS_MAC ) || defined( Q_WS_QWS ) class QSessionManagerData { public: QStringList restartCommand; QStringList discardCommand; QString sessionId; QString sessionKey; QSessionManager::RestartHint restartHint; }; QSessionManager* qt_session_manager_self = 0; QSessionManager::QSessionManager( QApplication * app, QString &id, QString &key ) : QObject( app, "qt_sessionmanager" ) { qt_session_manager_self = this; d = new QSessionManagerData; #if defined(Q_WS_WIN) && !defined(Q_OS_TEMP) wchar_t guidstr[40]; GUID guid; CoCreateGuid( &guid ); StringFromGUID2(guid, guidstr, 40); id = QString::fromUcs2((ushort*)guidstr); CoCreateGuid( &guid ); StringFromGUID2(guid, guidstr, 40); key = QString::fromUcs2((ushort*)guidstr); #endif d->sessionId = id; d->sessionKey = key; d->restartHint = RestartIfRunning; } QSessionManager::~QSessionManager() { delete d; qt_session_manager_self = 0; } QString QSessionManager::sessionId() const { return d->sessionId; } QString QSessionManager::sessionKey() const { return d->sessionKey; } #if defined(Q_WS_X11) || defined(Q_WS_MAC) void* QSessionManager::handle() const { return 0; } #endif #if !defined(Q_WS_WIN) bool QSessionManager::allowsInteraction() { return TRUE; } bool QSessionManager::allowsErrorInteraction() { return TRUE; } void QSessionManager::release() { } void QSessionManager::cancel() { } #endif void QSessionManager::setRestartHint( QSessionManager::RestartHint hint) { d->restartHint = hint; } QSessionManager::RestartHint QSessionManager::restartHint() const { return d->restartHint; } void QSessionManager::setRestartCommand( const QStringList& command) { d->restartCommand = command; } QStringList QSessionManager::restartCommand() const { return d->restartCommand; } void QSessionManager::setDiscardCommand( const QStringList& command) { d->discardCommand = command; } QStringList QSessionManager::discardCommand() const { return d->discardCommand; } void QSessionManager::setManagerProperty( const QString&, const QString&) { } void QSessionManager::setManagerProperty( const QString&, const QStringList& ) { } bool QSessionManager::isPhase2() const { return FALSE; } void QSessionManager::requestPhase2() { } #endif // QT_NO_SM_SUPPORT #endif //QT_NO_SESSIONMANAGER