tqt3/doc/porting3.doc

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/*!
\page porting.html

\title Porting to TQt 3.x

This document describes porting applications from TQt 2.x to TQt 3.x. 

The TQt 3.x series is not binary compatible with the 2.x series. This
means programs compiled for TQt 2.x must be recompiled to work with Qt
3.x.  TQt 3.x is also not completely \e source compatible with 2.x,
however all points of incompatibility cause compiler errors or
run-time messages (rather than mysterious results).  TQt 3.x includes
many additional features and discards obsolete functionality. Porting
from TQt 2.x to TQt 3.x is straightforward, and once completed makes 
the considerable additional power and flexibility of TQt 3.x available
for use in your applications.

To port code from TQt 2.x to TQt 3.x:

\list 1

\i Briefly read the porting notes below to get an idea of what to expect.
\i Be sure your code compiles and runs well on all your target platforms
   with TQt 2.x.
\i Recompile with TQt 3.x.  For each error, search below for related
   identifiers (e.g. function names, class names). This document 
   mentions all relevant identifiers to help you get the information
   you need at the cost of being a little verbose.
\i If you get stuck, ask on the \link http://qt-interest.trolltech.com/
   qt-interest \endlink mailing list, or Trolltech Technical Support if
   you're a registered licensee.

\endlist

Table of contents:

\tableofcontents

\target Linkerrors
\section1 Link Errors on Windows

On Windows, originally in TQt 2.x, the default configuration of the Qt
library is static. If you just use the default configuration you
don't need to set certain preprocessor defines.  In TQt 3.0, the
default configuration of the TQt library is to build it as a shared
library, therefore the preprocessor define \c QT_DLL is needed.

If you use tmake with TQt 2.x, and now use qmake with TQt 3.x, then the
cause of the problem is with the project file. In the project file,
there is usually line that looks like:

\c CONFIG = ...

this should be changed to 

\c CONFIG += ...

so that qmake can look at the configuration that TQt was built with and
set any relevant preprocessor defines in the makefile.

\target Headers
\section1 Header file inclusion changes

Qt 3.x remove some unnecessary nested #include directives from
header files. This speeds up compilation when you don't need those
nested header files. But in some cases you will find you need to add
an extra #include to your files.

For example, if you get a message about TQStringList or its functions
not being defined, then add \c {#include <tqstringlist.h>} at
the top of the file giving the error.

Header files that you might need to add #include directives for include:
\list
\i \c <tqcursor.h>
\i \c <tqpainter.h>
\i \c <tqpen.h>
\i \c <tqstringlist.h>
\i \c <tqregexp.h>
\i \c <tqstrlist.h>
\i \c <tqstyle.h>
\i \c <tqvaluelist.h>
\endlist

\section1 Namespace

Qt 3.x is namespace clean.  A few global identifiers that had been
left in TQt 2.x have been discarded.

Enumeration \l TQt::CursorShape and its values are now part of the
special \c TQt class defined in ntqnamespace.h. If you get compilation
errors about these being missing (unlikely, since most of your code will
be in classes that inherit from the TQt namespace class), then apply
the following changes:

\list
\i \c TQCursorShape becomes \c TQt::CursorShape
\i \c ArrowCursor becomes \c TQt::ArrowCursor
\i \c UpArrowCursor becomes \c TQt::UpArrowCursor
\i \c CrossCursor becomes \c TQt::CrossCursor
\i \c WaitCursor becomes \c TQt::WaitCursor
\i \c IbeamCursor becomes \c TQt::IbeamCursor
\i \c SizeVerCursor becomes \c TQt::SizeVerCursor
\i \c SizeHorCursor becomes \c TQt::SizeHorCursor
\i \c SizeBDiagCursor becomes \c TQt::SizeBDiagCursor
\i \c SizeFDiagCursor becomes \c TQt::SizeFDiagCursor
\i \c SizeAllCursor becomes \c TQt::SizeAllCursor
\i \c BlankCursor becomes \c TQt::BlankCursor
\i \c SplitVCursor becomes \c TQt::SplitVCursor
\i \c SplitHCursor becomes \c TQt::SplitHCursor
\i \c PointingHandCursor becomes \c TQt::PointingHandCursor
\i \c BitmapCursor becomes \c TQt::BitmapCursor
\endlist

The names of some debugging macro variables have been changed.  We have
tried not to break source compatibility as much as possible.  If you observe
error messages on the UNIX console or the Windows debugging stream that were
previously disabled, please check these macro variables:

\list
\i \c DEBUG becomes \c QT_DEBUG
\i \c NO_DEBUG becomes \c TQT_NO_DEBUG
\i \c NO_CHECK becomes \c TQT_NO_CHECK
\i \c CHECK_STATE becomes \c QT_CHECK_STATE
\i \c CHECK_RANGE becomes \c QT_CHECK_RANGE
\i \c CHECK_NULL becomes \c QT_CHECK_NULL
\i \c CHECK_MATH becomes \c QT_CHECK_MATH
\endlist

The name of some debugging macro functions has been changed:

\list
\i \c ASSERT becomes \c Q_ASSERT
\endlist

For the record, undocumented macro variables that are not part of the API
have been changed:

\list
\i \c _OS_*_ becomes \c Q_OS_*
\i \c _WS_*_ becomes \c TQ_WS_*
\i \c _CC_*_ becomes \c Q_CC_*
\endlist

\section1 Removed Properties

\list
\i TQLineEdit::hasMarkedText. Use TQLineEdit::hasSelectedText instead.
\i TQLineEdit::markedText. Use TQLineEdit::selectedText instead.
\i TQToolButton::offIconSet. Use TQToolButton::iconSet instead.
\i TQToolButton::onIconSet. Use TQToolButton::iconSet instead.
\endlist

\section1 Removed Functions

All these functions have been removed in TQt 3.x:
\list
\i TQButton::autoResize() const
\i TQButton::setAutoResize(bool)
\i TQFont::charSet()
\i TQFont::setCharSet()
\i TQLineEdit::cursorLeft(bool mark, int steps = 1). Use TQLineEdit::cursorBackward() instead.
\i TQLineEdit::cursorRight(bool mark, int steps = 1). Use TQLineEdit::cursorForward() instead.
\i TQLineEdit::hasMarkedText() const. Use TQLineEdit::hasSelectedText() instead.
\i TQLineEdit::markedText() const. Use TQLineEdit::selectedText() instead.
\i TQLineEdit::repaintArea(int, int). Use TQLineEdit::update() instead.
\i TQMenuBar::setActItem()
\i TQMenuBar::setWindowsAltMode()
\i TQObject::initMetaObject()
\i TQPainter::drawQuadBezier()
\i TQPalette::normal(). Use TQPalette::active() instead.
\i TQPalette::setNormal(). Use TQPalette::setActive() instead.
\i TQPointArray::quadBezier()
\i TQRegExp::find()
\i TQSignal::block(bool b)
\i TQSignal::isBlocked() const
\i TQSignal::parameter() const. Use TQSignal::value() instead.
\i TQSignal::setParameter(int value). Use TQSignal::setValue() instead.
\i TQSpinBox::downButton()
\i TQSpinBox::upButton()
\i TQString::basicDirection()
\i TQString::visual()
\i TQStyle::set...() functions
\i TQStyle::drawArrow()
\i TQThread::postEvent(TQObject *receiver, TQEvent *event). Use TQApplication::postEvent() instead.
\i TQToolButton::iconSet(bool on) const
\i TQToolButton::offIconSet() const
\i TQToolButton::onIconSet() const
\i TQToolButton::setIconSet(const TQIconSet \&set, bool on)
\i TQToolButton::setOffIconSet(const TQIconSet \&)
\i TQToolButton::setOnIconSet(const TQIconSet \&)
\i TQWidget::setFontPropagation()
\i TQWidget::setPalettePropagation()
\endlist

Also, to avoid conflicts with \c <iostream>, the following three
global functions have been renamed:
\list
\i setw() (renamed qSetW())
\i setfill() (renamed qSetFill())
\i setprecision() (renamed qSetPrecision())
\endlist

\section1 Obsoleted Functions

The following functions have been obsoleted in TQt 3.0. The
documentation of each of these functions should explain how to
replace them in TQt 3.0.

\warning It is best to consult \l http://doc.trolltech.com/3.0/
rather than the documentation supplied with TQt to obtain the latest
information regarding obsolete functions and how to replace them in
new code.

\list
\i TQAccel::keyToString( TQKeySequence k )
\i TQAccel::stringToKey( const TQString \& s )
\i TQActionGroup::insert( TQAction *a )
\i TQCanvasItem::active() const
\i TQCanvasItem::enabled() const
\i TQCanvasItem::selected() const
\i TQCanvasItem::visible() const
\i TQCanvasPixmapArray::TQCanvasPixmapArray( TQPtrList\<TQPixmap\> list, TQPtrList\<TQPoint\> hotspots )
\i TQCanvasPixmapArray::operator!()
\i TQColorGroup::TQColorGroup( const TQColor \& foreground, const TQColor \& background, const TQColor \& light, const TQColor \& dark, const TQColor \& mid, const TQColor \& text, const TQColor \& base )
\i TQComboBox::autoResize() const
\i TQComboBox::setAutoResize( bool )
\i TQDate::dayName( int weekday )
\i TQDate::monthName( int month )
\i TQDir::encodedEntryList( const TQString \& nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
\i TQDir::encodedEntryList( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
\i TQDockWindow::isHorizontalStretchable() const
\i TQDockWindow::isVerticalStretchable() const
\i TQDockWindow::setHorizontalStretchable( bool b )
\i TQDockWindow::setVerticalStretchable( bool b )
\i TQFont::defaultFont()
\i TQFont::setDefaultFont( const TQFont \& f )
\i TQFont::setPixelSizeFloat( float pixelSize )
\i TQFontDatabase::bold( const TQString \& family, const TQString \& style, const TQString \& ) const
\i TQFontDatabase::families( bool ) const
\i TQFontDatabase::font( const TQString \& familyName, const TQString \& style, int pointSize, const TQString \& )
\i TQFontDatabase::isBitmapScalable( const TQString \& family, const TQString \& style, const TQString \& ) const
\i TQFontDatabase::isFixedPitch( const TQString \& family, const TQString \& style, const TQString \& ) const
\i TQFontDatabase::isScalable( const TQString \& family, const TQString \& style, const TQString \& ) const
\i TQFontDatabase::isSmoothlyScalable( const TQString \& family, const TQString \& style, const TQString \& ) const
\i TQFontDatabase::italic( const TQString \& family, const TQString \& style, const TQString \& ) const
\i TQFontDatabase::pointSizes( const TQString \& family, const TQString \& style, const TQString \& )
\i TQFontDatabase::smoothSizes( const TQString \& family, const TQString \& style, const TQString \& )
\i TQFontDatabase::styles( const TQString \& family, const TQString \& ) const
\i TQFontDatabase::weight( const TQString \& family, const TQString \& style, const TQString \& ) const
\i TQLabel::autoResize() const
\i TQLabel::setAutoResize( bool enable )
\i TQListBox::cellHeight( int i ) const
\i TQListBox::cellHeight() const
\i TQListBox::cellWidth() const
\i TQListBox::findItem( int yPos ) const
\i TQListBox::inSort( const TQListBoxItem *lbi )
\i TQListBox::inSort( const TQString \& text )
\i TQListBox::itemYPos( int index, int *yPos ) const
\i TQListBox::numCols() const
\i TQListBox::totalHeight() const
\i TQListBox::totalWidth() const
\i TQListBoxItem::current() const
\i TQListBoxItem::selected() const
\i TQListView::removeItem( TQListViewItem *item )
\i TQListViewItem::removeItem( TQListViewItem *item )
\i TQMainWindow::addToolBar( TQDockWindow *, Dock = DockTop, bool newLine = FALSE )
\i TQMainWindow::addToolBar( TQDockWindow *, const TQString \& label, Dock = DockTop, bool newLine = FALSE )
\i TQMainWindow::lineUpToolBars( bool keepNewLines = FALSE )
\i TQMainWindow::moveToolBar( TQDockWindow *, Dock = DockTop )
\i TQMainWindow::moveToolBar( TQDockWindow *, Dock, bool nl, int index, int extraOffset = -1 )
\i TQMainWindow::removeToolBar( TQDockWindow *)
\i TQMainWindow::setToolBarsMovable( bool )
\i TQMainWindow::toolBarPositionChanged( TQToolBar *)
\i TQMainWindow::toolBarsMovable() const
\i QMessageBox::message( const TQString \& caption, const TQString \& text, const TQString \& buttonText = TQString::null, TQWidget *parent = 0, const char *= 0 )
\i QMessageBox::query( const TQString \& caption, const TQString \& text, const TQString \& yesButtonText = TQString::null, const TQString \& noButtonText = TQString::null, TQWidget *parent = 0, const char *= 0 )
\i QMessageBox::standardIcon( Icon icon, GUIStyle style )
\i TQRegExp::match( const TQString \& str, int index = 0, int *len = 0, bool indexIsStart = TRUE ) const
\i TQScrollView::childIsVisible( TQWidget *child )
\i TQScrollView::showChild( TQWidget *child, bool show = TRUE )
\i TQSimpleRichText::draw( TQPainter *p, int x, int y, const TQRegion \& clipRegion, const TQColorGroup \& cg, const TQBrush *paper = 0 ) const
\i TQString::ascii() const
\i TQString::data() const
\i TQString::setExpand( uint index, TQChar c )
\i TQStyle::defaultFrameWidth() const
\i TQStyle::scrollBarExtent() const
\i TQStyle::tabbarMetrics( const TQWidget *t, int \& hf, int \& vf, int \& ov ) const
\i TQTabDialog::isTabEnabled( const char *name ) const
\i TQTabDialog::selected( const TQString \& )
\i TQTabDialog::selected( const TQString \& tabLabel )
\i TQTabDialog::setTabEnabled( const char *name, bool enable )
\i TQTextStream::TQTextStream( TQString \& str, int filemode )
\i TQToolBar::TQToolBar( const TQString \& label, TQMainWindow *, ToolBarDock = DockTop, bool newLine = FALSE, const char *name = 0 )
\i TQToolTip::enabled()
\i TQToolTip::setEnabled( bool enable )
\i TQTranslator::find( const char *context, const char *sourceText, const char *comment = 0 ) const
\i TQTranslator::insert( const char *context, const char *sourceText, const TQString \& translation )
\i TQTranslator::remove( const char *context, const char *sourceText )
\i TQUriDrag::setFilenames( const TQStringList \& fnames )
\i TQWidget::backgroundColor() const
\i TQWidget::backgroundPixmap() const
\i TQWidget::iconify()
\i TQWidget::setBackgroundColor( const TQColor \& c )
\i TQWidget::setBackgroundPixmap( const TQPixmap \& pm )
\i TQWidget::setFont( const TQFont \& f, bool )
\i TQWidget::setPalette( const TQPalette \& p, bool )
\i TQWizard::setFinish( TQWidget *, bool )
\i TQXmlInputSource::TQXmlInputSource( TQFile \& file )
\i TQXmlInputSource::TQXmlInputSource( TQTextStream \& stream )
\i TQXmlReader::parse( const TQXmlInputSource \& input )
\endlist

Additionally, these preprocessor directives have been removed:

\list
\i \c {#define strlen tqstrlen}
\i \c {#define strcpy qstrcpy}
\i \c {#define strcmp qstrcmp}
\i \c {#define strncmp tqstrncmp}
\i \c {#define stricmp tqstricmp}
\i \c {#define strnicmp tqstrnicmp}
\endlist

See the changes-3.0.0 document for an explanation of why this had to be done.
You might have been relying on the non-portable and unpredictable behavior
resulting from these directives. We strongly recommend that you either make
use of the safe qstr* variants directly or ensure that no 0 pointer is
passed to the standard C functions in your code base.

\section1 Collection Class Renaming

The classes QArray, QCollection, TQList, TQListIterator, QQueue, QStack
and QVector have been renamed as per the following table. The original
names are no longer avaialable.

\table
\header \i Old Name \i New Name \i New Header File
\row \i QArray \i \l TQMemArray \i \c <tqmemarray.h>
\row \i QCollection \i \l TQPtrCollection \i \c <tqptrcollection.h>
\row \i TQList \i \l TQPtrList \i \c <tqptrlist.h>
\row \i TQListIterator \i \l TQPtrListIterator \i \c <tqptrlist.h>
\row \i QQueue \i \l TQPtrQueue \i \c <tqptrqueue.h>
\row \i QStack \i \l TQPtrStack \i \c <tqptrstack.h>
\row \i QVector \i \l TQPtrVector \i \c <tqptrvector.h>
\endtable

\section1 TQButtonGroup

In TQt 2.x, the function TQButtonGroup::selected() returns the selected
\e radio button (TQRadioButton). In TQt 3.0, it returns the selected \e
toggle button (\l TQButton::toggleButton), a more general concept.
This might affect programs that use TQButtonGroups that contain a
mixture of radio buttons and non-radio (e.g. TQCheckBox) toggle buttons.

\section1 TQDate

Two TQDate member functions that were virtual in TQt 2.0 are not virtual
in TQt 3.0. This is only relevant if you subclassed TQDate and
reimplemented these functions:

\list
\i TQString TQDate::monthName( int month ) const
\i TQString TQDate::dayName( int weekday ) const
\endlist

In addition to no longer being virtual, TQDate::monthName() and
TQDate::dayName() have been renamed TQDate::shortMonthName() and
TQDate::shortDayName() and have been made static (as they should had
been in the first place). The old names are still provided for source
compatibility.

\section1 TQFileDialog

If the mode was not set explicitly, and the user entered a
non-existent file, the dialog would accept this. In TQt 3.x, you must
set the mode, e.g. setMode(TQFileDialog::AnyFile), to get the same
behavior.

\section1 TQFont

The internals of TQFont have changed significantly between TQt 2.2 and
Qt 3.0, to give better Unicode support and to make developing
internationalized applications easier. The original API has been
preserved with minimal changes. The CharSet enum and its related
functions have disappeared. This is because TQt now handles all charset
related issues internally, and removes this burden from the developer.

If you used the CharSet enum or its related functions, e.g
TQFont::charSet() or TQFont::setCharSet(), just remove them from your
code. There are a few functions that took a TQFont::CharSet as a
parameter; in these cases simply remove the charset from the
parameter list.

\section1 TQInputDialog

The two static getText(...) methods in TQInputDialog have been merged. 
The \c echo parameter is the third parameter and defaults to 
TQLineEdit::Normal. 

If you used calls to TQInputDialog::getText(...) that provided more 
than the first two required parameters you will must add a value 
for the \c echo parameter.

\section1 TQLayout and Other Abstract Layout Classes

The definitions of \l TQGLayoutIterator, \l TQLayout, \l TQLayoutItem, \l
TQLayoutIterator, \l TQSpacerItem and \l TQWidgetItem have been moved from \c
<tqabstractlayout.h> to \c <tqlayout.h>. The header \c
<tqabstractlayout.h> has been removed.

\section1 TQListViewItem

The paintBranches() function in TQt 2.x had a GUIStyle parameter; this
has been dropped for TQt 3.x since GUI style is handled by the new
style engine (See \l TQStyle.)

\section1 QMoveEvent

In TQt 2.x, the function QMoveEvent::pos() returned the position of the
widget in its parent widget, including the window frame. In TQt 3.0,
it returns the new position of the widget, excluding window frame for
top level widgets.

\section1 TQMultiLineEdit

The TQMultiLineEdit was a simple editor widget in previous TQt versions.
Since TQt 3.0 includes a new richtext engine, which also supports
editing, TQMultiLineEdit is obsolete. For the sake of compatibility
TQMultiLineEdit is still provided. It is now a subclass of TQTextEdit
which wraps the old TQMultiLineEdit so that it is mostly source
compatible to keep old applications working.

For new applications and when maintaining existing applications we
recommend that you use TQTextEdit instead of TQMultiLineEdit wherever
possible.

Although most of the old TQMultiLineEdit API is still available, there
is one important difference. The old TQMultiLineEdit operated in terms
of lines, whereas TQTextEdit operates in terms of paragraphs. This is
because lines change all the time during wordwrap, whereas paragraphs
remain paragraphs. The consequence of this change is that functions
which previously operated on lines, e.g. numLines(), textLine(), etc.,
now work on paragraphs.

Also the function getString() has been removed since it
published the internal data structure.

In most cases, applications that used TQMultiLineEdit will continue to
work without problems. Applications that worked in terms of lines may
require some porting.

The source code for the old 2.x version of TQMultiLineEdit can be found
in \c $TQTDIR/src/attic/qtmultilineedit.h/cpp. Note that the class has
been renamed to QtMultiLineEdit to avoid name clashes. If you really
need to keep compatibility with the old TQMultiLineEdit, simply include
this class in your project and rename TQMultiLineEdit to
QtMultiLineEdit throughout.

\section1 TQPrinter

TQPrinter has undergone some changes, to make it more flexible and
to ensure it has the same runtime behaviour on both Unix and Windows. In 2.x,
TQPrinter behaved differently on Windows and Unix, when using view
transformations on the TQPainter. This has changed now, and TQPrinter
behaves consistently across all platforms. A compatibilty mode has been
added that forces the old behaviour, to ease porting from TQt 2.x
to TQt 3.x. This compatibilty mode can be enabled by passing the
TQPrinter::Compatible flag to the TQPrinter constructor.

On X11, TQPrinter used to generate encapsulated postscript when
fullPage() was TRUE and only one page was printed. This does not
happen by default anymore, providing a more consistent printing output.

\section1 TQRegExp

The \l TQRegExp class has been rewritten to support many of the features of Perl
regular expressions.  Both the regular expression syntax and the TQRegExp
interface have been modified.

Be also aware that \c <tqregexp.h> is no longer included
automatically when you include \c <tqstringlist.h>. See
\link #Headers above \endlink for details.

\omit
In TQt 3.0, tqregexp.h has to
include tqstringlist.h, so it's no good to have tqstringlist.h include tqregexp.h,
unless one wants to achieve an Escher effect.
\endomit

\section2 New special characters

There are five new special characters: <tt>(</tt>, <tt>)</tt>, <tt>{</tt>,
<tt>|</tt> and <tt>}</tt> (parentheses, braces and pipe). When porting old
regular expressions, you must add <tt>&#92;</tt> (backslash) in front of any
of these (actually, <tt>&#92;&#92;</tt> in C++ strings), unless it is already
there.

Example: Old code like
\code
    TQRegExp rx( "([0-9|]*\\)" );        // works in TQt 2.x
\endcode
should be converted into
\code
    TQRegExp rx( "\\([0-9\\|]*\\)" );      // works in TQt 2.x and 3.x
\endcode
(Within character classes, the backslash is not necessary in front of certain
characters, e.g. <tt>|</tt>, but it doesn't hurt.)

Wildcard patterns need no conversion.  Here are two examples:
\code
    TQRegExp wild( "(*.*)" );
    wild.setWildcard( TRUE );
\endcode
\code
    // TRUE as third argument means wildcard
    TQRegExp wild( "(*.*)", FALSE, TRUE );
\endcode
However, when they are used, make sure to use TQRegExp::exactMatch()
rather than the obsolete TQRegExp::match(). TQRegExp::match(), like
TQRegExp::find(), tries to find a match somewhere in the target
string, while TQRegExp::exactMatch() tries to match the whole target
string.

\section2 TQRegExp::operator=()

This function has been replaced by \l TQRegExp::setPattern() in TQt 2.2.
Old code such as
\code
    TQRegExp rx( "alpha" );
    rx.setCaseSensitive( FALSE );
    rx.setWildcard( TRUE );
    rx = "beta";
\endcode
still compiles with TQt 3, but produces a different result (the case sensitivity
and wildcard options are forgotten). This way,
\code
    rx = "beta";
\endcode
is the same as
\code
    rx = TQRegExp( "beta" );
\endcode
which is what one expects.

\section2 TQRegExp::match()

The following function is now obsolete, as it has an unwieldy
parameter list and was poorly named:
\list
\i bool TQRegExp::match( const TQString \& str, int index = 0,
			int * len = 0, bool indexIsStart = TRUE ) const
\endlist
It will be removed in a future version of Qt. Its \link
TQRegExp::match() documentation \endlink explains how to replace it.

\section2 TQRegExp::find()

This function was removed, after a brief appearance in TQt 2.2.  Its
name clashed with TQString::find().  Use \l TQRegExp::search() or \l
TQString::find() instead.

\section2 TQString::findRev() and TQString::contains()

\l TQString::findRev()'s and \l TQString::contains()'s semantics have changed
between 2.0 and 3.0 to be more consistent with the other overloads.

For example,
\code
    TQString( "" ).contains( TQRegExp("") )
\endcode
returns 1 in TQt 2.0; it returns 0 in TQt 3.0. Also, "^" now really means
start of input, so
\code
    TQString( "Heisan Hoppsan" ).contains( TQRegExp("^.*$") )
\endcode
returns 1, not 13 or 14.

This change affect very few existing programs.

\section2 TQString::replace()

With TQt 1.0 and 2.0, a TQString is converted implicitly into a TQRegExp
as the first argument to TQString::replace():
\code
    TQString text = fetch_it_from_somewhere();
    text.replace( TQString("[A-Z]+"), "" );
\endcode
With TQt 3.0, the compiler gives an error. The solution is to use a
TQRegExp cast:
\code
    text.replace( TQRegExp("[A-Z]+"), "" );
\endcode
This change makes it possible to introduce a
TQString::replace(TQString, TQString) overload in a future version of Qt
without breaking source compatibility.

\section1 QSemiModal 

The QSemiModal class is now obsolete. You should call show() on a
modal dialog instead.

\section1 QSortedList

The QSortedList class is now obsolete. Consider using a TQDict, a TQMap
or a plain TQPtrList instead.

\section1 TQTableView

The TQTableView class has been obsoleted and is no longer a part of the
Qt API. Either use the powerful TQTable class or the simplistic
TQGridView in any new code you create. If you really need the old table
view for compatibility you can find it in \c
$TQTDIR/src/attic/qttableview.{cpp,h}. Note that the class has been
renamed from TQTableView to QtTableView to avoid name clashes. To use
it, simply include it in your project and rename TQTableView to
QtTableView throughout.

\section1 TQToolButton

The \l TQToolButton class used to distinguish between "on" and "off"
icons. In 3.0, this mechanism was moved into the \l TQIconSet class
(see \l TQIconSet::State). The two TQToolButton::onIconSet and
TQToolButton::offIconSet properties have been removed, together with
the following two functions as well.

\list
\i void TQToolButton::setIconSet ( const TQIconSet \& set, bool on )
\i TQIconSet TQToolButton::iconSet ( bool on ) const
\endlist

New code should use the following functions instead:

\list
\i void TQToolButton::setIconSet( const TQIconSet \& set )
\i TQIconSet TQToolButton::iconSet() const
\endlist

\section1 TQTextStream

The global TQTextStream manipulators setw(), setfill() and setprecison()
were renamed to qSetW(), qSetFill() and qSetPrecision() to avoid conflicts
with \c <iostream.h>. If you used them, you must rename the occurrences to
the new names.

\section1 TQTranslator

The \l TQTranslator class was extended in TQt 2.2, and these extensions
lead to a new interface.  This interface is used mainly by translation
tools (for example, \link linguist-manual.book Qt
Linguist \endlink).  For source compatibility, no member function was
effectively removed.  The \l TQTranslator documentation points out
which functions are obsolete.

This function is no longer virtual:

\list
\i TQString TQTranslator::find( const char * context,
			      const char * sourceText ) const
\endlist

If you have a class that inherits TQTranslator and which reimplements
TQTranslator::find(), you should reimplement TQTranslator::findMessage() instead.
In fact, find() is now defined in terms of findMessage().  By doing the
conversion, you will also gain support for translator comments and for any
future extensions.

\section1 TQWidget

TQWidget::backgroundColor(), TQWidget::setBackgroundColor(),
TQWidget::backgroundPixmap() and TQWidget::setBackgroundPixmap() have
often been the source of much confusion in previous releases. TQt 3.0
addresses this by obsoleting these functions and by replacing them
with eight new functions: TQWidget::eraseColor(),
TQWidget::setEraseColor(), TQWidget::erasePixmap(),
TQWidget::setErasePixmap(), TQWidget::paletteBackgroundColor(),
TQWidget::setPaletteBackgroundColor(),
TQWidget::paletteBackgroundPixmap() and
TQWidget::setPaletteBackgroundPixmap(). See their documentation for
details.

\section1 TQXml Classes

\section2 TQXmlInputSource

The semantics of TQXmlInputSource has changed slightly. This change
only affects code that parses the same data from the same input source
multiple times. In such cases you must call
TQXmlInputSource::reset() before the second call to
TQXmlSimpleReader::parse().

So code like
\code
    TQXmlInputSource source( &xmlFile );
    TQXmlSimpleReader reader;
    ...
    reader.parse( source );
    ...
    reader.parse( source );
\endcode
must be changed to
\code
    TQXmlInputSource source( &xmlFile );
    TQXmlSimpleReader reader;
    ...
    reader.parse( source );
    ...
    source.reset();
    reader.parse( source );
\endcode

\section2 TQXmlLocator

Due to some internal changes, it was necessary to clean-up the semantics of
TQXmlLocator: this class is now an abstract class. This shouldn't cause
any problems, since programmers usually used the TQXmlLocator that was
reported by TQXmlContentHandler::setDocumentLocator(). If you used this
class in some other way, you must adjust your code to use the
TQXmlLocator that is reported by the
TQXmlContentHandler::setDocumentLocator() function.

\section1 Asynchronous I/O Classes

TQAsyncIO, TQDataSink, TQDataSource, TQIODeviceSource and TQDataPump were
used internally in previous versions of Qt, but are not used anymore.
They are now obsolete.

\section1 Transparent widgets

In TQt 2.x, the AutoMask property was used to obtain a
transparent-looking widget. In general, this approach is slow and
processor hungry. TQt 3.0 uses the BackgroundOrigin which provides
vastly improved performance and more flexibility in most cases. The
few classes for which the AutoMask property is still the best approach
are TQCheckBox, TQComboBox, TQPushButton, TQRadioButton and TQTabWidget.

\section1 Bezier Curves

The function names for Bezier curves in TQPainter and TQPointArray have
been corrected. They now properly reflect their cubic form instead of
a quadratic one. If you have been using either
TQPainter::drawQuadBezier() or TQPointArray::quadBezier() you must
replace these calls with
\list
\i void TQPainter::drawCubicBezier( const TQPointArray \&, int index=0 ) and
\i TQPointArray TQPointArray::cubicBezier() const
\endlist
respectively. Neither the arguments nor the resulting curve have changed.

\section1 Locale-aware String Comparisons in TQIconView, TQListBox,
	  TQListView and TQTable

In TQt 2.x, TQString only provided string comparisons using the Unicode
values of the characters of a string. This is efficient and reliable,
but it is not the appropriate order for most languages. For example,
French users expect '&eacute;' (e acute) to be treated essentially as
'e' and not put after 'z'.

In TQt 3.0, TQString::localeAwareCompare() implements locale aware
string comparisions on certain platforms. The classes \l TQIconView, \l
TQListBox, \l TQListView and \l TQTable now use
TQString::localeAwareCompare() instead of TQString::compare(). If you
want to control the behaviour yourself you can always reimplement
TQIconViewItem::compare(), TQListBox::text(), TQListViewItem::compare()
or TQTableItem::key() as appropriate.

*/