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817 lines
31 KiB
817 lines
31 KiB
/****************************************************************************
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**
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** Help with porting from Qt 2.x to Qt 3.x
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the Qt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free Qt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.QPL
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** included in the packaging of this file. Licensees holding valid Qt
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** Commercial licenses may use this file in accordance with the Qt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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/*!
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\page porting.html
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\title Porting to Qt 3.x
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This document describes porting applications from Qt 2.x to Qt 3.x.
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The Qt 3.x series is not binary compatible with the 2.x series. This
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means programs compiled for Qt 2.x must be recompiled to work with Qt
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3.x. Qt 3.x is also not completely \e source compatible with 2.x,
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however all points of incompatibility cause compiler errors or
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run-time messages (rather than mysterious results). Qt 3.x includes
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many additional features and discards obsolete functionality. Porting
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from Qt 2.x to Qt 3.x is straightforward, and once completed makes
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the considerable additional power and flexibility of Qt 3.x available
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for use in your applications.
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To port code from Qt 2.x to Qt 3.x:
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\list 1
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\i Briefly read the porting notes below to get an idea of what to expect.
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\i Be sure your code compiles and runs well on all your target platforms
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with Qt 2.x.
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\i Recompile with Qt 3.x. For each error, search below for related
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identifiers (e.g. function names, class names). This document
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mentions all relevant identifiers to help you get the information
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you need at the cost of being a little verbose.
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\i If you get stuck, ask on the \link http://qt-interest.trolltech.com/
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qt-interest \endlink mailing list, or Trolltech Technical Support if
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you're a registered licensee.
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\endlist
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Table of contents:
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\tableofcontents
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\target Linkerrors
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\section1 Link Errors on Windows
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On Windows, originally in Qt 2.x, the default configuration of the Qt
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library is static. If you just use the default configuration you
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don't need to set certain preprocessor defines. In Qt 3.0, the
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default configuration of the Qt library is to build it as a shared
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library, therefore the preprocessor define \c QT_DLL is needed.
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If you use tmake with Qt 2.x, and now use qmake with Qt 3.x, then the
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cause of the problem is with the project file. In the project file,
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there is usually line that looks like:
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\c CONFIG = ...
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this should be changed to
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\c CONFIG += ...
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so that qmake can look at the configuration that Qt was built with and
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set any relevant preprocessor defines in the makefile.
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\target Headers
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\section1 Header file inclusion changes
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Qt 3.x remove some unnecessary nested #include directives from
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header files. This speeds up compilation when you don't need those
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nested header files. But in some cases you will find you need to add
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an extra #include to your files.
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For example, if you get a message about QStringList or its functions
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not being defined, then add \c {#include <qstringlist.h>} at
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the top of the file giving the error.
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Header files that you might need to add #include directives for include:
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\list
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\i \c <qcursor.h>
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\i \c <qpainter.h>
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\i \c <qpen.h>
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\i \c <qstringlist.h>
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\i \c <qregexp.h>
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\i \c <qstrlist.h>
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\i \c <qstyle.h>
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\i \c <qvaluelist.h>
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\endlist
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\section1 Namespace
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Qt 3.x is namespace clean. A few global identifiers that had been
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left in Qt 2.x have been discarded.
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Enumeration \l Qt::CursorShape and its values are now part of the
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special \c Qt class defined in qnamespace.h. If you get compilation
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errors about these being missing (unlikely, since most of your code will
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be in classes that inherit from the Qt namespace class), then apply
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the following changes:
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\list
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\i \c QCursorShape becomes \c Qt::CursorShape
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\i \c ArrowCursor becomes \c Qt::ArrowCursor
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\i \c UpArrowCursor becomes \c Qt::UpArrowCursor
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\i \c CrossCursor becomes \c Qt::CrossCursor
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\i \c WaitCursor becomes \c Qt::WaitCursor
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\i \c IbeamCursor becomes \c Qt::IbeamCursor
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\i \c SizeVerCursor becomes \c Qt::SizeVerCursor
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\i \c SizeHorCursor becomes \c Qt::SizeHorCursor
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\i \c SizeBDiagCursor becomes \c Qt::SizeBDiagCursor
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\i \c SizeFDiagCursor becomes \c Qt::SizeFDiagCursor
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\i \c SizeAllCursor becomes \c Qt::SizeAllCursor
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\i \c BlankCursor becomes \c Qt::BlankCursor
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\i \c SplitVCursor becomes \c Qt::SplitVCursor
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\i \c SplitHCursor becomes \c Qt::SplitHCursor
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\i \c PointingHandCursor becomes \c Qt::PointingHandCursor
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\i \c BitmapCursor becomes \c Qt::BitmapCursor
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\endlist
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The names of some debugging macro variables have been changed. We have
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tried not to break source compatibility as much as possible. If you observe
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error messages on the UNIX console or the Windows debugging stream that were
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previously disabled, please check these macro variables:
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\list
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\i \c DEBUG becomes \c QT_DEBUG
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\i \c NO_DEBUG becomes \c QT_NO_DEBUG
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\i \c NO_CHECK becomes \c QT_NO_CHECK
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\i \c CHECK_STATE becomes \c QT_CHECK_STATE
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\i \c CHECK_RANGE becomes \c QT_CHECK_RANGE
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\i \c CHECK_NULL becomes \c QT_CHECK_NULL
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\i \c CHECK_MATH becomes \c QT_CHECK_MATH
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\endlist
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The name of some debugging macro functions has been changed as well
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but source compatibility should not be affected if the macro variable
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\c QT_CLEAN_NAMESPACE is not defined:
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\list
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\i \c ASSERT becomes \c Q_ASSERT
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\i \c CHECK_PTR becomes \c Q_CHECK_PTR
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\endlist
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For the record, undocumented macro variables that are not part of the API
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have been changed:
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\list
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\i \c _OS_*_ becomes \c Q_OS_*
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\i \c _WS_*_ becomes \c Q_WS_*
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\i \c _CC_*_ becomes \c Q_CC_*
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\endlist
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\section1 Removed Functions
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All these functions have been removed in Qt 3.x:
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\list
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\i QFont::charSet()
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\i QFont::setCharSet()
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\i QMenuBar::setActItem()
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\i QMenuBar::setWindowsAltMode()
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\i QObject::initMetaObject()
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\i QPainter::drawQuadBezier()
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\i QPointArray::quadBezier()
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\i QRegExp::find()
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\i QSpinBox::downButton()
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\i QSpinBox::upButton()
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\i QString::basicDirection()
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\i QString::visual()
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\i QStyle::set...() functions
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\i QStyle::drawArrow()
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\i QWidget::setFontPropagation()
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\i QWidget::setPalettePropagation()
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\endlist
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Also, to avoid conflicts with \c <iostream>, the following three
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global functions have been renamed:
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\list
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\i setw() (renamed qSetW())
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\i setfill() (renamed qSetFill())
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\i setprecision() (renamed qSetPrecision())
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\endlist
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\section1 Obsoleted Functions
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The following functions have been obsoleted in Qt 3.0. The
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documentation of each of these functions should explain how to
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replace them in Qt 3.0.
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\warning It is best to consult \l http://doc.trolltech.com/3.0/
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rather than the documentation supplied with Qt to obtain the latest
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information regarding obsolete functions and how to replace them in
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new code.
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\list
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\i QAccel::keyToString( QKeySequence k )
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\i QAccel::stringToKey( const QString \& s )
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\i QActionGroup::insert( QAction *a )
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\i QButton::autoResize() const
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\i QButton::setAutoResize( bool )
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\i QCanvasItem::active() const
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\i QCanvasItem::enabled() const
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\i QCanvasItem::selected() const
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\i QCanvasItem::visible() const
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\i QCanvasPixmapArray::QCanvasPixmapArray( QPtrList\<QPixmap\> list, QPtrList\<QPoint\> hotspots )
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\i QCanvasPixmapArray::operator!()
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\i QColorGroup::QColorGroup( const QColor \& foreground, const QColor \& background, const QColor \& light, const QColor \& dark, const QColor \& mid, const QColor \& text, const QColor \& base )
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\i QComboBox::autoResize() const
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\i QComboBox::setAutoResize( bool )
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\i QDate::dayName( int weekday )
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\i QDate::monthName( int month )
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\i QDir::encodedEntryList( const QString \& nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
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\i QDir::encodedEntryList( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
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\i QDockWindow::isHorizontalStretchable() const
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\i QDockWindow::isVerticalStretchable() const
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\i QDockWindow::setHorizontalStretchable( bool b )
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\i QDockWindow::setVerticalStretchable( bool b )
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\i QFont::defaultFont()
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\i QFont::setDefaultFont( const QFont \& f )
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\i QFont::setPixelSizeFloat( float pixelSize )
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\i QFontDatabase::bold( const QString \& family, const QString \& style, const QString \& ) const
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\i QFontDatabase::families( bool ) const
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\i QFontDatabase::font( const QString \& familyName, const QString \& style, int pointSize, const QString \& )
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\i QFontDatabase::isBitmapScalable( const QString \& family, const QString \& style, const QString \& ) const
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\i QFontDatabase::isFixedPitch( const QString \& family, const QString \& style, const QString \& ) const
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\i QFontDatabase::isScalable( const QString \& family, const QString \& style, const QString \& ) const
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\i QFontDatabase::isSmoothlyScalable( const QString \& family, const QString \& style, const QString \& ) const
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\i QFontDatabase::italic( const QString \& family, const QString \& style, const QString \& ) const
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\i QFontDatabase::pointSizes( const QString \& family, const QString \& style, const QString \& )
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\i QFontDatabase::smoothSizes( const QString \& family, const QString \& style, const QString \& )
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\i QFontDatabase::styles( const QString \& family, const QString \& ) const
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\i QFontDatabase::weight( const QString \& family, const QString \& style, const QString \& ) const
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\i QLabel::autoResize() const
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\i QLabel::setAutoResize( bool enable )
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\i QLineEdit::cursorLeft( bool mark, int steps = 1 )
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\i QLineEdit::cursorRight( bool mark, int steps = 1 )
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\i QLineEdit::hasMarkedText() const
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\i QLineEdit::markedText() const
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\i QLineEdit::repaintArea( int, int )
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\i QListBox::cellHeight( int i ) const
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\i QListBox::cellHeight() const
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\i QListBox::cellWidth() const
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\i QListBox::findItem( int yPos ) const
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\i QListBox::inSort( const QListBoxItem *lbi )
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\i QListBox::inSort( const QString \& text )
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\i QListBox::itemYPos( int index, int *yPos ) const
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\i QListBox::numCols() const
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\i QListBox::totalHeight() const
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\i QListBox::totalWidth() const
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\i QListBoxItem::current() const
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\i QListBoxItem::selected() const
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\i QListView::removeItem( QListViewItem *item )
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\i QListViewItem::removeItem( QListViewItem *item )
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\i QMainWindow::addToolBar( QDockWindow *, Dock = DockTop, bool newLine = FALSE )
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\i QMainWindow::addToolBar( QDockWindow *, const QString \& label, Dock = DockTop, bool newLine = FALSE )
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\i QMainWindow::lineUpToolBars( bool keepNewLines = FALSE )
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\i QMainWindow::moveToolBar( QDockWindow *, Dock = DockTop )
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\i QMainWindow::moveToolBar( QDockWindow *, Dock, bool nl, int index, int extraOffset = -1 )
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\i QMainWindow::removeToolBar( QDockWindow *)
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\i QMainWindow::setToolBarsMovable( bool )
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\i QMainWindow::toolBarPositionChanged( QToolBar *)
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\i QMainWindow::toolBarsMovable() const
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\i QMessageBox::message( const QString \& caption, const QString \& text, const QString \& buttonText = QString::null, QWidget *parent = 0, const char *= 0 )
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\i QMessageBox::query( const QString \& caption, const QString \& text, const QString \& yesButtonText = QString::null, const QString \& noButtonText = QString::null, QWidget *parent = 0, const char *= 0 )
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\i QMessageBox::standardIcon( Icon icon, GUIStyle style )
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\i QPalette::normal()
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\i QRegExp::match( const QString \& str, int index = 0, int *len = 0, bool indexIsStart = TRUE ) const
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\i QScrollView::childIsVisible( QWidget *child )
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\i QScrollView::showChild( QWidget *child, bool show = TRUE )
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\i QSignal::block( bool b )
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\i QSignal::isBlocked() const
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\i QSignal::parameter() const
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\i QSignal::setParameter( int value )
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\i QSimpleRichText::draw( QPainter *p, int x, int y, const QRegion \& clipRegion, const QColorGroup \& cg, const QBrush *paper = 0 ) const
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\i QString::ascii() const
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\i QString::data() const
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\i QString::setExpand( uint index, QChar c )
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\i QStyle::defaultFrameWidth() const
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\i QStyle::scrollBarExtent() const
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\i QStyle::tabbarMetrics( const QWidget *t, int \& hf, int \& vf, int \& ov ) const
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\i QTabDialog::isTabEnabled( const char *name ) const
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\i QTabDialog::selected( const QString \& )
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\i QTabDialog::selected( const QString \& tabLabel )
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\i QTabDialog::setTabEnabled( const char *name, bool enable )
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\i QTextStream::QTextStream( QString \& str, int filemode )
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\i QToolBar::QToolBar( const QString \& label, QMainWindow *, ToolBarDock = DockTop, bool newLine = FALSE, const char *name = 0 )
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\i QToolButton::iconSet( bool on ) const
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\i QToolButton::offIconSet() const
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\i QToolButton::onIconSet() const
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\i QToolButton::setIconSet( const QIconSet \& set, bool on )
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\i QToolButton::setOffIconSet( const QIconSet \& )
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\i QToolButton::setOnIconSet( const QIconSet \& )
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\i QToolTip::enabled()
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\i QToolTip::setEnabled( bool enable )
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\i QTranslator::find( const char *context, const char *sourceText, const char *comment = 0 ) const
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\i QTranslator::insert( const char *context, const char *sourceText, const QString \& translation )
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\i QTranslator::remove( const char *context, const char *sourceText )
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\i QUriDrag::setFilenames( const QStringList \& fnames )
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\i QWidget::backgroundColor() const
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\i QWidget::backgroundPixmap() const
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\i QWidget::iconify()
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\i QWidget::setBackgroundColor( const QColor \& c )
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\i QWidget::setBackgroundPixmap( const QPixmap \& pm )
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\i QWidget::setFont( const QFont \& f, bool )
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\i QWidget::setPalette( const QPalette \& p, bool )
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\i QWizard::setFinish( QWidget *, bool )
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\i QXmlInputSource::QXmlInputSource( QFile \& file )
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\i QXmlInputSource::QXmlInputSource( QTextStream \& stream )
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\i QXmlReader::parse( const QXmlInputSource \& input )
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\endlist
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Additionally, these preprocessor directives have been removed:
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\list
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\i \c {#define strlen qstrlen}
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\i \c {#define strcpy qstrcpy}
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\i \c {#define strcmp qstrcmp}
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\i \c {#define strncmp qstrncmp}
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\i \c {#define stricmp qstricmp}
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\i \c {#define strnicmp qstrnicmp}
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\endlist
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See the changes-3.0.0 document for an explanation of why this had to be done.
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You might have been relying on the non-portable and unpredictable behavior
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resulting from these directives. We strongly recommend that you either make
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use of the safe qstr* variants directly or ensure that no 0 pointer is
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passed to the standard C functions in your code base.
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\section1 Collection Class Renaming
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The classes QArray, QCollection, QList, QListIterator, QQueue, QStack
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and QVector have been renamed. To ease porting, the old names and the
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old header-file names are still supported.
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\table
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\header \i Old Name \i New Name \i New Header File
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\row \i QArray \i \l QMemArray \i \c <qmemarray.h>
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\row \i QCollection \i \l QPtrCollection \i \c <qptrcollection.h>
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\row \i QList \i \l QPtrList \i \c <qptrlist.h>
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\row \i QListIterator \i \l QPtrListIterator \i \c <qptrlist.h>
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\row \i QQueue \i \l QPtrQueue \i \c <qptrqueue.h>
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\row \i QStack \i \l QPtrStack \i \c <qptrstack.h>
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\row \i QVector \i \l QPtrVector \i \c <qptrvector.h>
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\endtable
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\section1 QButtonGroup
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In Qt 2.x, the function QButtonGroup::selected() returns the selected
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\e radio button (QRadioButton). In Qt 3.0, it returns the selected \e
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toggle button (\l QButton::toggleButton), a more general concept.
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This might affect programs that use QButtonGroups that contain a
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mixture of radio buttons and non-radio (e.g. QCheckBox) toggle buttons.
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\section1 QDate
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Two QDate member functions that were virtual in Qt 2.0 are not virtual
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in Qt 3.0. This is only relevant if you subclassed QDate and
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reimplemented these functions:
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\list
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\i QString QDate::monthName( int month ) const
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\i QString QDate::dayName( int weekday ) const
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\endlist
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In addition to no longer being virtual, QDate::monthName() and
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QDate::dayName() have been renamed QDate::shortMonthName() and
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QDate::shortDayName() and have been made static (as they should had
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been in the first place). The old names are still provided for source
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compatibility.
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\section1 QFileDialog
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If the mode was not set explicitly, and the user entered a
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non-existent file, the dialog would accept this. In Qt 3.x, you must
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set the mode, e.g. setMode(QFileDialog::AnyFile), to get the same
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behavior.
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\section1 QFont
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The internals of QFont have changed significantly between Qt 2.2 and
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Qt 3.0, to give better Unicode support and to make developing
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internationalized applications easier. The original API has been
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preserved with minimal changes. The CharSet enum and its related
|
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functions have disappeared. This is because Qt now handles all charset
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related issues internally, and removes this burden from the developer.
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If you used the CharSet enum or its related functions, e.g
|
|
QFont::charSet() or QFont::setCharSet(), just remove them from your
|
|
code. There are a few functions that took a QFont::CharSet as a
|
|
parameter; in these cases simply remove the charset from the
|
|
parameter list.
|
|
|
|
\section1 QInputDialog
|
|
|
|
The two static getText(...) methods in QInputDialog have been merged.
|
|
The \c echo parameter is the third parameter and defaults to
|
|
QLineEdit::Normal.
|
|
|
|
If you used calls to QInputDialog::getText(...) that provided more
|
|
than the first two required parameters you will must add a value
|
|
for the \c echo parameter.
|
|
|
|
\section1 QLayout and Other Abstract Layout Classes
|
|
|
|
The definitions of \l QGLayoutIterator, \l QLayout, \l QLayoutItem, \l
|
|
QLayoutIterator, \l QSpacerItem and \l QWidgetItem have been moved from \c
|
|
<qabstractlayout.h> to \c <qlayout.h>. The header \c
|
|
<qabstractlayout.h> now includes \c <qlayout.h> for compatibility. It
|
|
might be removed in a future version.
|
|
|
|
\section1 QListViewItem
|
|
|
|
The paintBranches() function in Qt 2.x had a GUIStyle parameter; this
|
|
has been dropped for Qt 3.x since GUI style is handled by the new
|
|
style engine (See \l QStyle.)
|
|
|
|
\section1 QMoveEvent
|
|
|
|
In Qt 2.x, the function QMoveEvent::pos() returned the position of the
|
|
widget in its parent widget, including the window frame. In Qt 3.0,
|
|
it returns the new position of the widget, excluding window frame for
|
|
top level widgets.
|
|
|
|
\section1 QMultiLineEdit
|
|
|
|
The QMultiLineEdit was a simple editor widget in previous Qt versions.
|
|
Since Qt 3.0 includes a new richtext engine, which also supports
|
|
editing, QMultiLineEdit is obsolete. For the sake of compatibility
|
|
QMultiLineEdit is still provided. It is now a subclass of QTextEdit
|
|
which wraps the old QMultiLineEdit 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 QTextEdit instead of QMultiLineEdit wherever
|
|
possible.
|
|
|
|
Although most of the old QMultiLineEdit API is still available, there
|
|
is one important difference. The old QMultiLineEdit operated in terms
|
|
of lines, whereas QTextEdit 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 QMultiLineEdit 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 QMultiLineEdit can be found
|
|
in \c $QTDIR/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 QMultiLineEdit, simply include
|
|
this class in your project and rename QMultiLineEdit to
|
|
QtMultiLineEdit throughout.
|
|
|
|
\section1 QPrinter
|
|
|
|
QPrinter 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,
|
|
QPrinter behaved differently on Windows and Unix, when using view
|
|
transformations on the QPainter. This has changed now, and QPrinter
|
|
behaves consistently across all platforms. A compatibilty mode has been
|
|
added that forces the old behaviour, to ease porting from Qt 2.x
|
|
to Qt 3.x. This compatibilty mode can be enabled by passing the
|
|
QPrinter::Compatible flag to the QPrinter constructor.
|
|
|
|
On X11, QPrinter 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 QRegExp
|
|
|
|
The \l QRegExp class has been rewritten to support many of the features of Perl
|
|
regular expressions. Both the regular expression syntax and the QRegExp
|
|
interface have been modified.
|
|
|
|
Be also aware that \c <qregexp.h> is no longer included
|
|
automatically when you include \c <qstringlist.h>. See
|
|
\link #Headers above \endlink for details.
|
|
|
|
\omit
|
|
In Qt 3.0, qregexp.h has to
|
|
include qstringlist.h, so it's no good to have qstringlist.h include qregexp.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>\</tt> (backslash) in front of any
|
|
of these (actually, <tt>\\</tt> in C++ strings), unless it is already
|
|
there.
|
|
|
|
Example: Old code like
|
|
\code
|
|
QRegExp rx( "([0-9|]*\\)" ); // works in Qt 2.x
|
|
\endcode
|
|
should be converted into
|
|
\code
|
|
QRegExp rx( "\\([0-9\\|]*\\)" ); // works in Qt 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
|
|
QRegExp wild( "(*.*)" );
|
|
wild.setWildcard( TRUE );
|
|
\endcode
|
|
\code
|
|
// TRUE as third argument means wildcard
|
|
QRegExp wild( "(*.*)", FALSE, TRUE );
|
|
\endcode
|
|
However, when they are used, make sure to use QRegExp::exactMatch()
|
|
rather than the obsolete QRegExp::match(). QRegExp::match(), like
|
|
QRegExp::find(), tries to find a match somewhere in the target
|
|
string, while QRegExp::exactMatch() tries to match the whole target
|
|
string.
|
|
|
|
\section2 QRegExp::operator=()
|
|
|
|
This function has been replaced by \l QRegExp::setPattern() in Qt 2.2.
|
|
Old code such as
|
|
\code
|
|
QRegExp rx( "alpha" );
|
|
rx.setCaseSensitive( FALSE );
|
|
rx.setWildcard( TRUE );
|
|
rx = "beta";
|
|
\endcode
|
|
still compiles with Qt 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 = QRegExp( "beta" );
|
|
\endcode
|
|
which is what one expects.
|
|
|
|
\section2 QRegExp::match()
|
|
|
|
The following function is now obsolete, as it has an unwieldy
|
|
parameter list and was poorly named:
|
|
\list
|
|
\i bool QRegExp::match( const QString \& str, int index = 0,
|
|
int * len = 0, bool indexIsStart = TRUE ) const
|
|
\endlist
|
|
It will be removed in a future version of Qt. Its \link
|
|
QRegExp::match() documentation \endlink explains how to replace it.
|
|
|
|
\section2 QRegExp::find()
|
|
|
|
This function was removed, after a brief appearance in Qt 2.2. Its
|
|
name clashed with QString::find(). Use \l QRegExp::search() or \l
|
|
QString::find() instead.
|
|
|
|
\section2 QString::findRev() and QString::contains()
|
|
|
|
\l QString::findRev()'s and \l QString::contains()'s semantics have changed
|
|
between 2.0 and 3.0 to be more consistent with the other overloads.
|
|
|
|
For example,
|
|
\code
|
|
QString( "" ).contains( QRegExp("") )
|
|
\endcode
|
|
returns 1 in Qt 2.0; it returns 0 in Qt 3.0. Also, "^" now really means
|
|
start of input, so
|
|
\code
|
|
QString( "Heisan Hoppsan" ).contains( QRegExp("^.*$") )
|
|
\endcode
|
|
returns 1, not 13 or 14.
|
|
|
|
This change affect very few existing programs.
|
|
|
|
\section2 QString::replace()
|
|
|
|
With Qt 1.0 and 2.0, a QString is converted implicitly into a QRegExp
|
|
as the first argument to QString::replace():
|
|
\code
|
|
QString text = fetch_it_from_somewhere();
|
|
text.replace( QString("[A-Z]+"), "" );
|
|
\endcode
|
|
With Qt 3.0, the compiler gives an error. The solution is to use a
|
|
QRegExp cast:
|
|
\code
|
|
text.replace( QRegExp("[A-Z]+"), "" );
|
|
\endcode
|
|
This change makes it possible to introduce a
|
|
QString::replace(QString, QString) 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 QDict, a QMap
|
|
or a plain QPtrList instead.
|
|
|
|
\section1 QTableView
|
|
|
|
The QTableView class has been obsoleted and is no longer a part of the
|
|
Qt API. Either use the powerful QTable class or the simplistic
|
|
QGridView in any new code you create. If you really need the old table
|
|
view for compatibility you can find it in \c
|
|
$QTDIR/src/attic/qttableview.{cpp,h}. Note that the class has been
|
|
renamed from QTableView to QtTableView to avoid name clashes. To use
|
|
it, simply include it in your project and rename QTableView to
|
|
QtTableView throughout.
|
|
|
|
\section1 QToolButton
|
|
|
|
The \l QToolButton class used to distinguish between "on" and "off"
|
|
icons. In 3.0, this mechanism was moved into the \l QIconSet class
|
|
(see \l QIconSet::State).
|
|
|
|
The old \l QToolButton::onIconSet and \l QToolButton::offIconSet
|
|
properties are still provided so that old source will compile, but
|
|
their semantics have changed: they are now synonyms for \l
|
|
QToolButton::iconSet. If you used that distinction in Qt 2.x, you will
|
|
need to adjust your code to use the QIconSet On/Off mechanism.
|
|
|
|
Likewise, the \e on parameter of these two functions is now ignored:
|
|
|
|
\list
|
|
\i void QToolButton::setIconSet ( const QIconSet \& set, bool on )
|
|
\i QIconSet QToolButton::iconSet ( bool on ) const
|
|
\endlist
|
|
|
|
These functions are only provided for ease of porting. New code
|
|
should use the following instead:
|
|
|
|
\list
|
|
\i void QToolButton::setIconSet( const QIconSet \& set )
|
|
\i QIconSet QToolButton::iconSet() const
|
|
\endlist
|
|
|
|
Finally, this function is no longer virtual:
|
|
|
|
\list
|
|
\i void QToolButton::setIconSet( const QIconSet \& set, bool on )
|
|
\endlist
|
|
|
|
If you have a class that inherits QToolButton and that reimplements
|
|
QToolButton::setIconSet(), you should make the signature of the
|
|
reimplementation agree with the new \l QToolButton::setIconSet(),
|
|
a virtual function.
|
|
|
|
\section1 QTextStream
|
|
|
|
The global QTextStream 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 QTranslator
|
|
|
|
The \l QTranslator class was extended in Qt 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 QTranslator documentation points out
|
|
which functions are obsolete.
|
|
|
|
This function is no longer virtual:
|
|
|
|
\list
|
|
\i QString QTranslator::find( const char * context,
|
|
const char * sourceText ) const
|
|
\endlist
|
|
|
|
If you have a class that inherits QTranslator and which reimplements
|
|
QTranslator::find(), you should reimplement QTranslator::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 QWidget
|
|
|
|
QWidget::backgroundColor(), QWidget::setBackgroundColor(),
|
|
QWidget::backgroundPixmap() and QWidget::setBackgroundPixmap() have
|
|
often been the source of much confusion in previous releases. Qt 3.0
|
|
addresses this by obsoleting these functions and by replacing them
|
|
with eight new functions: QWidget::eraseColor(),
|
|
QWidget::setEraseColor(), QWidget::erasePixmap(),
|
|
QWidget::setErasePixmap(), QWidget::paletteBackgroundColor(),
|
|
QWidget::setPaletteBackgroundColor(),
|
|
QWidget::paletteBackgroundPixmap() and
|
|
QWidget::setPaletteBackgroundPixmap(). See their documentation for
|
|
details.
|
|
|
|
\section1 QXml Classes
|
|
|
|
\section2 QXmlInputSource
|
|
|
|
The semantics of QXmlInputSource 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
|
|
QXmlInputSource::reset() before the second call to
|
|
QXmlSimpleReader::parse().
|
|
|
|
So code like
|
|
\code
|
|
QXmlInputSource source( &xmlFile );
|
|
QXmlSimpleReader reader;
|
|
...
|
|
reader.parse( source );
|
|
...
|
|
reader.parse( source );
|
|
\endcode
|
|
must be changed to
|
|
\code
|
|
QXmlInputSource source( &xmlFile );
|
|
QXmlSimpleReader reader;
|
|
...
|
|
reader.parse( source );
|
|
...
|
|
source.reset();
|
|
reader.parse( source );
|
|
\endcode
|
|
|
|
\section2 QXmlLocator
|
|
|
|
Due to some internal changes, it was necessary to clean-up the semantics of
|
|
QXmlLocator: this class is now an abstract class. This shouldn't cause
|
|
any problems, since programmers usually used the QXmlLocator that was
|
|
reported by QXmlContentHandler::setDocumentLocator(). If you used this
|
|
class in some other way, you must adjust your code to use the
|
|
QXmlLocator that is reported by the
|
|
QXmlContentHandler::setDocumentLocator() function.
|
|
|
|
\section1 Asynchronous I/O Classes
|
|
|
|
QASyncIO, QDataSink, QDataSource, QIODeviceSource and QDataPump were
|
|
used internally in previous versions of Qt, but are not used anymore.
|
|
They are now obsolete.
|
|
|
|
\section1 Transparent widgets
|
|
|
|
In Qt 2.x, the AutoMask property was used to obtain a
|
|
transparent-looking widget. In general, this approach is slow and
|
|
processor hungry. Qt 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 QCheckBox, QComboBox, QPushButton, QRadioButton and QTabWidget.
|
|
|
|
\section1 Bezier Curves
|
|
|
|
The function names for Bezier curves in QPainter and QPointArray have
|
|
been corrected. They now properly reflect their cubic form instead of
|
|
a quadratic one. If you have been using either
|
|
QPainter::drawQuadBezier() or QPointArray::quadBezier() you must
|
|
replace these calls with
|
|
\list
|
|
\i void QPainter::drawCubicBezier( const QPointArray \&, int index=0 ) and
|
|
\i QPointArray QPointArray::cubicBezier() const
|
|
\endlist
|
|
respectively. Neither the arguments nor the resulting curve have changed.
|
|
|
|
\section1 Locale-aware String Comparisons in QIconView, QListBox,
|
|
QListView and QTable
|
|
|
|
In Qt 2.x, QString 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 'é' (e acute) to be treated essentially as
|
|
'e' and not put after 'z'.
|
|
|
|
In Qt 3.0, QString::localeAwareCompare() implements locale aware
|
|
string comparisions on certain platforms. The classes \l QIconView, \l
|
|
QListBox, \l QListView and \l QTable now use
|
|
QString::localeAwareCompare() instead of QString::compare(). If you
|
|
want to control the behaviour yourself you can always reimplement
|
|
QIconViewItem::compare(), QListBox::text(), QListViewItem::compare()
|
|
or QTableItem::key() as appropriate.
|
|
|
|
*/
|