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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Toolkit - Key Features in Qt 2.1</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: white; color: black; }--></style></head><body bgcolor="#ffffff"><p><table width="100%"><tr><td><a href="index.html"><img width="100" height="100" src="qtlogo.png"alt="Home" border="0"><img width="100"height="100" src="face.png" alt="Home" border="0"></a><td valign="top"><div align="right"><img src="dochead.png" width="472" height="27"><br><a href="classes.html"><b>Classes</b></a>- <a href="annotated.html">Annotated</a>- <a href="hierarchy.html">Tree</a>- <a href="functions.html">Functions</a>- <a href="index.html">Home</a>- <a href="topicals.html"><b>Structure</b> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" align="center" size=32>Qte</font></a></div></table><h1 align="center"> Key Features in Qt 2.1</h1><br clear="all">As usual, large sections of the documentation have been revised andlots of new documentation has been added.<p>Much work went into existing classes, based on all the feedback we gotfrom our users. A warm thank you to you all at this point, wehonestly hope to satisfy most of your wishes with the new release.<p>Among the things that got a lot of polishing is the new geometrymanagement system that was introduced with the 2.x series. Someclasses, such as QBoxLayout, have been rewritten and many size hintsand size policies were optimized. As usual with newly introducedsystems, the occasional bug has been fixed as well. As a result,layout in Qt-2.1 is not only nicer but also faster.<p>Big parts of the file dialog have been rewritten. It is nowsynchronized in terms of features with the common Windows dialog,including fancy drag'n'drop and in-place renaming. You can customizeboth parts of the dialog, the front-end with info and preview widgets,the back-end with different network protocols (see the QFileDialog andQNetworkProtocol documentation for details).<p>Especially interesting for dynamic Qt applications is the newlyintroduced property system. Many interesting things, from scriptingup to graphical user interface builders, become easier. Thetechnology requires a new macro Q_PROPERTY and a new revision of Qt'smeta object compiler (moc). See the Qt documentation for details.<p>Due to strong customer demand, we added a cross-platform way to easilyimplement multi-document interfaces (known as 'MDI'). The widget iscalled QWorkspace and makes this task trivial.<p>On X11, text dropping from Motif drag'n'drop applications has beenadded, to make your Qt applications inter-operable with those Motifapplications that survived Y2K.<p>The rich text system, first introduced in Qt 2.0, has been revised.Apart from great speed improvements, it now supports HTML tables aswell as floating images.<p>QMultiLineEdit, the text input field in Qt, got the missing word wrapfunctionality. It's probably the last big extension we will add tothat widget. In Qt 3.0, it will be replaced by a fancier, faster andmore powerful QTextEdit widget that also deals with different colorsand fonts in a way similar to the existing QTextView.<p>Qt follows the respective GUI style guides even more closely. Thisincludes honoring desktop settings, and keyboard shortcuts such asCtrl-Z/Y for undo/redo in line edit and multi-line edit controls.Dialog handling for both modal and non-modal dialogs has been improvedto follow the platform conventions precisely.<p>With QIconView, we added a powerful new visualization widget similarto QListView and QListBox. It contains optinally labelled pixmapitems that the user can select, drag around, rename, delete and more.<p>Compared to the previous release, we have managed to reduce overallmemory consumption while improving execution speed and features.<p><address><hr><div align="center"><table width="100%" cellspacing="0" border="0"><tr><td>Copyright ⌨️ 快捷键说明
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