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qt 6.5.1 original
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kleuter
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dist/changes-3.0.0-beta2
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dist/changes-3.0.0-beta2
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Qt 3.0 Beta2 is not binary compatible with Beta1, this means that any
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programs linked with Beta1 must be recompiled.
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Below you'll find a description of general changes in the Qt Library
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and Qt Designer followed by a detailed list of changes in the
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programming API.
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The Qt Library
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========================================
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Wacom Tablet Support
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--------------------
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Support for Wacom brand tablets has been introduced on Irix and
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Windows. These devices generate a QTabletEvent that can be handled by
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QWidget::tabletEvent(). The QTabletEvent holds information about
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pressure, X and Y tilt, and which device is being used (e.g. stylus or
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eraser). Note: at present, there are known issues with the Windows
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version.
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Documentation
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-------------
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Overall enhancements including fixed typos and the addition of several
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images and code examples.
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QStyle (and derived classes)
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----------------------------
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The style API has been completely rewritten in Qt 3.0. The main reason
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for doing this was because it was getting inconsistent, hard to
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maintain and extend. Most of the old 2.x functions have been replaced
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by a small set of more general functions. The new API is:
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- much more consistent
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- less work have to be done to create custom styles
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- easier to extend and maintain binary compatibility
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The old API relied upon a host of virtual functions that were
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re-implemented in the different styles. These functions were used to
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draw parts of, or entire widgets. The new API uses a small set of more
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general functions. Enumerated values are passed as parameters to these
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functions to specify which parts of a control or widget is to be drawn
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(e.g drawPrimitive( PE_ArrowUp, ...)).
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To create custom styles with the new API, simply subclass from the
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preferred base style and re-implement the function that draws the part
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of the widget you want to change. If you for example want to change
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the look of the arrows that are used in QWindowsStyle, subclass from
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it and re-implement the drawPrimitive() function. Your drawPrimitive()
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function may look something like this:
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void QMyStyle::drawPrimitive( PrimitiveElement pe, ... )
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{
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switch( pe ) {
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case PE_ArrowUp:
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// draw up arrow
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break;
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case PE_ArrowDown:
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// draw down arrow
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break;
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default:
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// let the base class handle the rest of the drawing
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QWindowsStyle::drawPrimitive( ... );
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break;
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}
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}
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For more information about the new style API, please read the QStyle
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documentation.
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Qt Designer
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========================================
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- Improved indentation algorithm for the code editor.
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- Allow multiple code editors to be open. This makes copy and paste
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much easier.
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Qt Functions
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========================================
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QCanvas
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-------
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- QCanvas does not react on windowActivationChange() anymore.
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- 64 bit cleanup.
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QChar
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-----
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- The Unicode character is stored host ordered now. Main advantage is
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that you can directly cast a QChar array to an array of unsigned shorts.
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QCom
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----
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- Introduced QS_OK, QS_FALSE, QE_NOINTERFACE, QE_INVALIDARG and
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QE_NOIMPL as possible QRESULT return values.
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QDate, QTime and QDateTime
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--------------------------
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- New function for outputting free form strings and new DateFormat
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enum Qt::LocalDate.
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New functions:
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QString toString( const QString& format );
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QDir
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----
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- entryInfoList() returns 0 for non-existing directories on Windows
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as the documentation claims and the Unix version already does.
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- On Windows, QDir tries a more failsafe way to determine the home
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directory.
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QDom
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----
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- QDomNode::hasChildNodes() now works as documented.
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- QDomDocument::toString() includes now namespaces in its output.
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- QDomDocument::QDomDocument() constructor now allows adding children
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to the document.
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QFileDialog
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-----------
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- Various fixes in file type filter and handling of file names and
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directories.
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QEvent
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------
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- New event type DeferredDelete. See QObject changes below.
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QGL
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---
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- Fix for Irix in respect of installing colormaps.
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- Swapped arguments of QGLColormap::setEntries() in order to be able
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to use a meaningful default argument.
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New class:
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QGLColormap - class for manipulating colormaps in GL index mode.
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QGridView
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---------
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A new class that provides an abstract base for fixed-size grids.
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QIconSet
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--------
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New function:
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void clearGenerated();
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QImage
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------
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- Handlers for image formats can be dynamically loaded as a plug-in by
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using the QImageFormatInterface.
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QLabel
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------
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- setIndent() behaves like documented.
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QLineEdit
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---------
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New function:
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int characterAt( int xpos, QChar *chr ) const;
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QLibrary
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--------
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Enabled plug-in loading with static Qt library (Windows).
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QMovie
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------
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- Does pixmap caching now. Reduces load e.g. on the X Server in the
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case of animated gifs.
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QObject
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-------
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- Added a deferredDelete() function that will cause the object to
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delete itself once the event loop is entered again.
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- A second type of destroyed signal - one that passes a pointer to
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the destroyed object as a parameter - will be emitted in QObject's
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destructor.
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New signal:
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void destroyed( QObject* obj );
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New slot:
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void deferredDelete();
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QPainter
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--------
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- So far clipping had always been done in the device coordinate
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system. The newly introduced ClipMode allows clipping regions to be
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set via setClipRect() and setClipRegion() in painter coordinates.
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New enum:
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enum ClipMode { ClipDevice, ClipPainter };
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Extended functions:
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QRegion clipRegion( ClipMode = ClipDevice ) const;
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void setClipRect( const QRect &, ClipMode = ClipDevice )
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void setClipRect( int x, int y, int w, int h, ClipMode = ClipDevice );
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void setClipRegion( const QRegion &, ClipMode = ClipDevice );
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QPrintDialog
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------------
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- Allow overriding the default print dialog. This way it's possible
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to better cope with the variety of existing print systems (API not
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finalized, yet).
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- The dialog reads current QPrinter on every invocation now.
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New functions:
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static void setGlobalPrintDialog( QPrintDialog * );
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virtual bool setupPrinters ( QListView *printers );
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QPrinter
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--------
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- X11 version only: Introduced Qt settings switch 'embedFonts' that
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allows disabling font embedding to reduce size of PostScript output.
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QProcess
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--------
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- Added function to retrieve the pid (Unix) or PROCESS_INFORMATION
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(Windows) from a running process.
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- Extra parameter for environment settings in start() and launch()
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functions.
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New/extended functions:
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PID processIdentifier();
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virtual bool start( QStringList *env=0 );
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virtual bool launch( const QString& buf, QStringList *env=0 );
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virtual bool launch( const QByteArray& buf, QStringList *env=0 );
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New signal:
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void launchFinished();
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QServerSocket
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-------------
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- Set the SO_REUSEADDR option so that the server can be restarted.
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QSocket
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-------
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- Make deletion of QSocket instances safe if it is in response to a
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signal emitted by the object itself.
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SocketDevice
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------------
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- Optional boolean parameter to be able to distinguish between
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timeout and connection closed by peer when waitForMore() returns.
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Extended functions:
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int waitForMore( int msecs, bool *timeout=0 ) const;
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QStyleSheet
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-----------
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- Added helper function that escapes HTML meta-characters.
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New function:
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QString escape( const QString& plain);
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QSql
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----
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- The source of the SQL driver plug-ins have been moved to
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$QTDIR/plugins/src/sqldrivers/.
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- The postgres driver checks the version number of the server. So there is
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no need for different drivers: QPSQL6 no longer exists -- use QPSQL7
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instead.
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- Postgres driver supports now 3 PostgreSQL back ends: 6.x, 7.0.x and 7.1.x
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- Better handling of errors coming from the database.
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- SQL driver for Microsoft SQL Server and Sybase Adaptive Server (TDS).
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- Added caching for forward-only cursors.
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- Avoid crashes on the unloading of SQL plugins that occurred on some
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platforms.
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- QSqlResults can be forward only to improve performance
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(QSqlResult::setForwardOnly()).
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- QSqlDatabase passes the port number to the SQL driver.
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QTable
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------
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- No longer calls processEvents() in columnWidthChanged() and
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rowHeightChanged() in order to avoid any side effects.
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- Ensure that mousePressEvent doesn't emit contextMenuRequested(),
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unless it is called from the contextMenu event handler.
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- For more useful subclassing the new functions listed below have
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been added.
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New functions:
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bool isEditing() const;
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EditMode editMode() const;
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int currEditRow() const;
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int currEditCol() const;
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QTextCodec
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----------
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- Fixes for characters in the 0x80..0xff range.
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QTextEdit
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---------
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- The rich text engine has seen many internal improvements and
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additions to the QTextEdit class.
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New functions:
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virtual void scrollToBottom();
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virtual void removeSelection( int selNum = 0 );
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virtual bool getParagraphFormat(...);
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virtual void insertParagraph( const QString &text, int para );
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virtual void removeParagraph( int para );
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virtual void insertAt( const QString &text, int para, int index );
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QRect paragraphRect( int para ) const;
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int paragraphAt( const QPoint &pos ) const;
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int charAt( const QPoint &pos, int *para ) const;
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QUrlOperator
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------------
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- More precise error messages.
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QWidget
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-------
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- Added a read-only property containing the widget's background brush.
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New function:
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virtual const QBrush& backgroundBrush() const;
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QWMatrix
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--------
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- New functions for mapping of geometric elements via matrix
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multiplication semantics.
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New functions:
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QRect mapRect( const QRect & );
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QPoint operator * (const QPoint & ) const;
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QRegion operator * (const QRect & ) const;
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QRegion operator * (const QRegion & ) const;
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QPointArray operator * ( const QPointArray &a ) const;
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