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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 - Qt Object Model</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"> Qt Object Model</h1><br clear="all">The standard C++ Object Model provides very efficient runtime supportof the object paradigm. On the negative side, its static nature showsinflexibility in certain problem domains. Graphical User Interfaceprogramming is one example that requires both runtime efficiency and ahigh level of flexibility. Qt provides this, by combining the speed ofC++ with the flexibility of the Qt Object Model.<p>In addition to C++, Qt provides<p><ul><li> a very powerful mechanism for seamless object communication dubbed <a href="signalsandslots.html">signals and slots</a>,<li> queryable and designable <a href="properties.html">object properties</a>,<li> powerful <a href="eventsandfilters.html">events and event filters</a>,<li> scoped <a href="i18n.html">string translation for internationalization</a>,<li> sophisticated interval driven <a href="timers.html">timers</a> that make it possible to elegantly integrate many tasks in an event-driven GUI.<li> hierarchical and queryable <a href="objecttrees.html">object trees</a> that organize object ownership in a natural way.<li> guarded pointers, <a href="qguardedptr.html">QGuardedPtr</a>, that are automatically set to null when the referenced object is destroyed, unlike normal C++ pointers which become "dangling pointers" in that case. </ul><p>Many of these Qt features are implemented with standard C++techniques, based on inheritance from <a href="qobject.html">QObject</a>. Others, like theobject communication mechanism and the dynamic property system,require the <a href="metaobjects.html">Meta Object System</a> providedby Qt's own <a href="moc.html">Meta Object Compiler (moc)</a>. Thinkof the Meta Object System as a C++ extension that makes the languagebetter suited for true component GUI programming.<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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