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240 lines
11 KiB
240 lines
11 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/toplevel/toplevel.doc:1 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Toplevel Widgets</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Toplevel Widgets</h1>
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<p>
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This example demonstrates the use of TQt's widget flags to provide
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toplevel widgets with customized window decorations.
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<p> It provides a graphical user interface for selecting different
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options for widget decoration and behavior, and passes the
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appropriate widget flags to the <a href="qwidget.html">TQWidget</a> constructor.
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<a href="qwidget.html#reparent">TQWidget::reparent</a>() is used to change the widget flags at runtime.
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<p> <b>Warning:</b> Note that the interpretation and functionality of the
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widget flags depends on the window manager used when running the
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application. Many window managers do not support every possible flag
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combination.
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<p> The user interface providing the different options was created using
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<a href="designer-manual.html">TQt Designer</a>. The different
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options are explained in the user interface through the use of
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tooltips and What's This help. Load the <tt>options.ui</tt> file into
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<a href="designer-manual.html">TQt Designer</a> for more details.
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<p>
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<pre> #include <<a href="qapplication-h.html">qapplication.h</a>>
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#include "options.h"
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int main( int argc, char ** argv )
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{
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<a href="qapplication.html">TQApplication</a> a( argc, argv );
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OptionsDialog dlg;
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return dlg.exec();
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}
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</pre>
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<p> The main function creates and displays the dialog for the user
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interface. Note that this dialog is modal.
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<p> The code relevant for this example is in the <tt>options.ui.h</tt>
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file.
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<p>
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<pre> void OptionsDialog::apply()
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{
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<a href="qstringlist.html">TQStringList</a> flagList;
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bool wstyle = false;
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WFlags f = WDestructiveClose | WType_TopLevel | WStyle_Customize;
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</pre>
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<p> The <tt>apply()</tt> slot declares the <a href="qt.html#WidgetFlags">widget flag</a> variable <tt>f</tt>
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and initializes it with the values
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<ul>
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<li> <tt>WDestructiveClose</tt> - the widget will be automatically
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destroyed when it is closed,
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<li> <tt>WType_TopLevel</tt> - the widget will be top level even if it
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has a parent widget, and
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<li> <tt>WStyle_Customize</tt> - the flags override the default values
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</ul>
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Other flags are used depending on the options selected in the user
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interface.
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<p> <pre> if ( bgBorder->isChecked() ) {
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if ( rbBorderNormal->isChecked() ) {
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f |= WStyle_NormalBorder;
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flagList += "WStyle_NormalBorder";
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wstyle = true;
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}
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else if ( rbBorderDialog->isChecked() ) {
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f |= WStyle_DialogBorder;
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flagList += "WStyle_DialogBorder";
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wstyle = true;
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}
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</pre>The window gets a normal or dialog border depending on the selected
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option.
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<p> <pre> if ( bgTitle->isChecked() ) {
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f |= WStyle_Title;
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flagList += "WStyle_Title";
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wstyle = true;
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if ( cbTitleSystem->isChecked() ) {
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f |= WStyle_SysMenu;
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flagList += "WStyle_SysMenu";
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}
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if ( cbTitleMinimize->isChecked() ) {
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f |= WStyle_Minimize;
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flagList += "WStyle_Minimize";
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}
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if ( cbTitleMaximize->isChecked() ) {
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f |= WStyle_Maximize;
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flagList += "WStyle_Maximize";
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}
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if ( cbTitleContext->isChecked() ) {
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f |= WStyle_ContextHelp;
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flagList += "WStyle_ContextHelp";
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}
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}
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</pre>A titlebar with controls is provided if the appropriate options
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have been checked.
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<p> <pre> } else {
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f |= WStyle_NoBorder;
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flagList += "WStyle_NoBorder";
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wstyle = true;
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}
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</pre>If the window should not have a border it cannot have a titlebar.
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Widgets that provide their own (e.g. themed) window decoration
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should use this flag.
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<p> <pre> <a href="qwidget.html">TQWidget</a> *parent = this;
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if ( cbBehaviorTaskbar->isChecked() ) {
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parent = 0;
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f |= WGroupLeader;
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flagList += "WGroupLeader";
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}
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</pre>If a toplevel widget has a parent it will not have a taskbar
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entry, and on most window managers it will always stay on
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top of the parent widget. This is the standard behavior for
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dialog boxes, especially if they are modeless, and for other
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secondary toplevel widgets.
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<p> To provide a taskbar entry the widget must have no parent,
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in which case we need to use the <tt>WGroupLeader</tt> flag to
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prevent blocking through the modal main dialog. Applications
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that can have multiple toplevel windows open simultaneously
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should use this combination.
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<p> <pre> if ( cbBehaviorStays->isChecked() ) {
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f |= WStyle_StaysOnTop /*| WX11BypassWM*/;
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flagList += "WStyle_StaysOnTop";
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wstyle = true;
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}
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</pre>A toplevel widget can stay on top of the whole desktop if the
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window manager supports this functionality.
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<a href="#footnote1"><sup>(1)</sup></a><a name="footnote-call1"></a>
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<p> Widgets that display important or realtime information (i.e. IRC
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clients) might benefit from using that flag.
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<p> <pre> if ( cbBehaviorPopup->isChecked() ) {
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f |= WType_Popup;
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flagList += "WType_Popup";
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}
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</pre>A popup widget is a short lived modal widget that closes
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automatically. Popup menus are a typical example for such widgets.
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<p> <pre> if ( cbBehaviorModal->isChecked() ) {
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f |= WShowModal;
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flagList += "WShowModal";
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}
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</pre>A modal widget blocks input to other toplevel widgets, unless
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those are in a different modal group (see <tt>WGroupLeader</tt>).
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Dialogs are often modal, and the <a href="qdialog.html">TQDialog</a> class provides an easy API
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to create and display them without the need to explicitly use this
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flag.
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<p> <pre> if ( cbBehaviorTool->isChecked() ) {
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f |= WStyle_Tool;
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flagList += "WStyle_Tool";
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wstyle = true;
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}
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if (wstyle)
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<a name="x2534"></a> flagList.<a href="qvaluelist.html#push_front">push_front</a>("WStyle_Customize");
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</pre>A tool window will never have a task bar entry (even if it
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has no parent widget), and often has a smaller window
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decoration. Tool windows are frequently used instead of
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modeless dialogs.
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<p> <pre> if ( !widget ) {
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widget = new <a href="qvbox.html">TQVBox</a>( parent, 0, f );
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<a name="x2530"></a> widget-><a href="qframe.html#setMargin">setMargin</a>( 20 );
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<a name="x2533"></a> <a href="qlabel.html">TQLabel</a> *label = new <a href="qlabel.html">TQLabel</a>(flagList.<a href="qstringlist.html#join">join</a>("&nbsp;| "), widget);
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<a name="x2532"></a> label-><a href="qlabel.html#setTextFormat">setTextFormat</a>(RichText);
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<a name="x2531"></a> label-><a href="qlabel.html#setAlignment">setAlignment</a>(WordBreak);
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<a href="qpushbutton.html">TQPushButton</a> *okButton = new <a href="qpushbutton.html">TQPushButton</a>( "Close", widget );
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<a name="x2535"></a> connect( okButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), widget, SLOT(<a href="qwidget.html#close">close</a>()) );
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<a name="x2537"></a> widget-><a href="qwidget.html#move">move</a>( pos() );
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</pre>The widget is created if it has not been created yet, or if it was
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closed (since we use the <tt>WDestructiveClose</tt> flag). Note that the
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window is not visible yet.
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<a href="#footnote2"><sup>(2)</sup></a><a name="footnote-call2"></a>
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<p> <pre> } else {
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<a name="x2538"></a><a name="x2536"></a> widget-><a href="qwidget.html#reparent">reparent</a>( parent, f, widget-><a href="qwidget.html#geometry">geometry</a>().topLeft(), FALSE);
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}
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</pre>If the widget has already been created the reparent() function is
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used to modify the widget's flags. The widget's geometry is not
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changed, and the window is not shown again.
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<p> <pre> <a name="x2539"></a> widget-><a href="qwidget.html#setCaption">setCaption</a>( leCaption->text() );
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<a name="x2540"></a> widget-><a href="qwidget.html#setIcon">setIcon</a>( leIcon->text() );
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<a name="x2541"></a> widget-><a href="qwidget.html#setWindowOpacity">setWindowOpacity</a>(double(slTransparency->maxValue() - slTransparency->value()) / 100);
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<a name="x2542"></a> widget-><a href="qwidget.html#show">show</a>();
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</pre>Finally the higher level properties such as the window's caption and
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icon are set. The window transparency is set according to the slider
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value. Note that this will only have effect on systems that support
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this attribute for toplevel window.
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<p> <pre> }
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</pre>Finally the window is shown with the new attributes.
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<p> To build the example go to the toplevel directory
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(<tt>QTDIR/examples/toplevel</tt>)
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<a href="#footnote3"><sup>(3)</sup></a><a name="footnote-call3"></a>
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and run <tt>qmake</tt> to generate the makefile, then use the make tool to
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build the library.
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<hr>
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<ol> <li><a name="footnote1"></a>
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Unfortunately some X11 window managers also retquire the <tt>WX11BypassWM</tt> flag to be set in addition; but some other X11 window
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managers will have problems if this flag is set. <a href="#footnote-call1">Back...</a> <li><a name="footnote2"></a>
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The example uses <a href="qguardedptr.html">TQGuardedPtr</a> to make sure that the
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pointer is reset to zero when the widget object is destroyed
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due to the <tt>WDestructiveClose</tt> flag. <a href="#footnote-call2">Back...</a> <li><a name="footnote3"></a>
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We use <tt>QTDIR</tt> to stand for the directory where TQt is installed.
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<a href="#footnote-call3">Back...</a></ol>
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</hr><p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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