323 lines
18 KiB
HTML
323 lines
18 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<!-- q3signal.cpp -->
|
|
<title>Qt 4.8: Q3Signal Class Reference</title>
|
|
<link rel="stylesheet" type="text/css" href="style/style.css" />
|
|
<script src="scripts/jquery.js" type="text/javascript"></script>
|
|
<script src="scripts/functions.js" type="text/javascript"></script>
|
|
<link rel="stylesheet" type="text/css" href="style/superfish.css" />
|
|
<link rel="stylesheet" type="text/css" href="style/narrow.css" />
|
|
<!--[if IE]>
|
|
<meta name="MSSmartTagsPreventParsing" content="true">
|
|
<meta http-equiv="imagetoolbar" content="no">
|
|
<![endif]-->
|
|
<!--[if lt IE 7]>
|
|
<link rel="stylesheet" type="text/css" href="style/style_ie6.css">
|
|
<![endif]-->
|
|
<!--[if IE 7]>
|
|
<link rel="stylesheet" type="text/css" href="style/style_ie7.css">
|
|
<![endif]-->
|
|
<!--[if IE 8]>
|
|
<link rel="stylesheet" type="text/css" href="style/style_ie8.css">
|
|
<![endif]-->
|
|
|
|
<script src="scripts/superfish.js" type="text/javascript"></script>
|
|
<script src="scripts/narrow.js" type="text/javascript"></script>
|
|
|
|
</head>
|
|
<body class="" onload="CheckEmptyAndLoadList();">
|
|
<div class="header" id="qtdocheader">
|
|
<div class="content">
|
|
<div id="nav-logo">
|
|
<a href="index.html">Home</a></div>
|
|
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
|
|
<div id="narrowsearch"></div>
|
|
<div id="nav-topright">
|
|
<ul>
|
|
<li class="nav-topright-home"><a href="http://qt.digia.com/">Qt HOME</a></li>
|
|
<li class="nav-topright-dev"><a href="http://qt-project.org/">DEV</a></li>
|
|
<li class="nav-topright-doc nav-topright-doc-active"><a href="http://qt-project.org/doc/">
|
|
DOC</a></li>
|
|
<li class="nav-topright-blog"><a href="http://blog.qt.digia.com/">BLOG</a></li>
|
|
</ul>
|
|
</div>
|
|
<div id="shortCut">
|
|
<ul>
|
|
<li class="shortCut-topleft-inactive"><span><a href="index.html">Qt 4.8</a></span></li>
|
|
<li class="shortCut-topleft-active"><a href="http://qt-project.org/doc/">ALL VERSIONS </a></li>
|
|
</ul>
|
|
</div>
|
|
<ul class="sf-menu" id="narrowmenu">
|
|
<li><a href="#">API Lookup</a>
|
|
<ul>
|
|
<li><a href="classes.html">Class index</a></li>
|
|
<li><a href="functions.html">Function index</a></li>
|
|
<li><a href="modules.html">Modules</a></li>
|
|
<li><a href="namespaces.html">Namespaces</a></li>
|
|
<li><a href="qtglobal.html">Global Declarations</a></li>
|
|
<li><a href="qdeclarativeelements.html">QML elements</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><a href="#">Qt Topics</a>
|
|
<ul>
|
|
<li><a href="qt-basic-concepts.html">Programming with Qt</a></li>
|
|
<li><a href="qtquick.html">Device UIs & Qt Quick</a></li>
|
|
<li><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
|
|
<li><a href="supported-platforms.html">Supported Platforms</a></li>
|
|
<li><a href="technology-apis.html">Qt and Key Technologies</a></li>
|
|
<li><a href="best-practices.html">How-To's and Best Practices</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><a href="#">Examples</a>
|
|
<ul>
|
|
<li><a href="all-examples.html">Examples</a></li>
|
|
<li><a href="tutorials.html">Tutorials</a></li>
|
|
<li><a href="demos.html">Demos</a></li>
|
|
<li><a href="qdeclarativeexamples.html">QML Examples</a></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="wrapper">
|
|
<div class="hd">
|
|
<span></span>
|
|
</div>
|
|
<div class="bd group">
|
|
<div class="sidebar">
|
|
<div class="searchlabel">
|
|
Search index:</div>
|
|
<div class="search" id="sidebarsearch">
|
|
<form id="qtdocsearch" action="" onsubmit="return false;">
|
|
<fieldset>
|
|
<input type="text" name="searchstring" id="pageType" value="" />
|
|
<div id="resultdialog">
|
|
<a href="#" id="resultclose">Close</a>
|
|
<p id="resultlinks" class="all"><a href="#" id="showallresults">All</a> | <a href="#" id="showapiresults">API</a> | <a href="#" id="showarticleresults">Articles</a> | <a href="#" id="showexampleresults">Examples</a></p>
|
|
<p id="searchcount" class="all"><span id="resultcount"></span><span id="apicount"></span><span id="articlecount"></span><span id="examplecount"></span> results:</p>
|
|
<ul id="resultlist" class="all">
|
|
</ul>
|
|
</div>
|
|
</fieldset>
|
|
</form>
|
|
</div>
|
|
<div class="box first bottombar" id="lookup">
|
|
<h2 title="API Lookup"><span></span>
|
|
API Lookup</h2>
|
|
<div id="list001" class="list">
|
|
<ul id="ul001" >
|
|
<li class="defaultLink"><a href="classes.html">Class index</a></li>
|
|
<li class="defaultLink"><a href="functions.html">Function index</a></li>
|
|
<li class="defaultLink"><a href="modules.html">Modules</a></li>
|
|
<li class="defaultLink"><a href="namespaces.html">Namespaces</a></li>
|
|
<li class="defaultLink"><a href="qtglobal.html">Global Declarations</a></li>
|
|
<li class="defaultLink"><a href="qdeclarativeelements.html">QML elements</a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="box bottombar" id="topics">
|
|
<h2 title="Qt Topics"><span></span>
|
|
Qt Topics</h2>
|
|
<div id="list002" class="list">
|
|
<ul id="ul002" >
|
|
<li class="defaultLink"><a href="qt-basic-concepts.html">Programming with Qt</a></li>
|
|
<li class="defaultLink"><a href="qtquick.html">Device UIs & Qt Quick</a></li>
|
|
<li class="defaultLink"><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
|
|
<li class="defaultLink"><a href="supported-platforms.html">Supported Platforms</a></li>
|
|
<li class="defaultLink"><a href="technology-apis.html">Qt and Key Technologies</a></li>
|
|
<li class="defaultLink"><a href="best-practices.html">How-To's and Best Practices</a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="box" id="examples">
|
|
<h2 title="Examples"><span></span>
|
|
Examples</h2>
|
|
<div id="list003" class="list">
|
|
<ul id="ul003">
|
|
<li class="defaultLink"><a href="all-examples.html">Examples</a></li>
|
|
<li class="defaultLink"><a href="tutorials.html">Tutorials</a></li>
|
|
<li class="defaultLink"><a href="demos.html">Demos</a></li>
|
|
<li class="defaultLink"><a href="qdeclarativeexamples.html">QML Examples</a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="wrap">
|
|
<div class="toolbar">
|
|
<div class="breadcrumb toolblock">
|
|
<ul>
|
|
<li class="first"><a href="index.html">Home</a></li>
|
|
<!-- Breadcrumbs go here -->
|
|
<li><a href="modules.html">Modules</a></li>
|
|
<li>Qt3SupportLight</li>
|
|
<li>Q3Signal</li>
|
|
</ul>
|
|
</div>
|
|
<div class="toolbuttons toolblock">
|
|
<ul>
|
|
<li id="smallA" class="t_button">A</li>
|
|
<li id="medA" class="t_button active">A</li>
|
|
<li id="bigA" class="t_button">A</li>
|
|
<li id="print" class="t_button"><a href="javascript:this.print();">
|
|
<span>Print</span></a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="content mainContent">
|
|
<div class="toc">
|
|
<h3><a name="toc">Contents</a></h3>
|
|
<ul>
|
|
<li class="level1"><a href="#public-functions">Public Functions</a></li>
|
|
<li class="level1"><a href="#details">Detailed Description</a></li>
|
|
</ul>
|
|
</div>
|
|
<h1 class="title">Q3Signal Class Reference</h1>
|
|
<!-- $$$Q3Signal-brief -->
|
|
<p>The Q3Signal class can be used to send signals for classes that don't inherit <a href="qobject.html">QObject</a>. <a href="#details">More...</a></p>
|
|
<!-- @@@Q3Signal -->
|
|
<pre class="cpp"> <span class="preprocessor">#include <Q3Signal></span></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See <a href="porting4.html#qsignal">Porting to Qt 4</a> for more information.</p>
|
|
<p><b>Inherits: </b><a href="qobject.html">QObject</a>.</p>
|
|
<ul>
|
|
<li><a href="q3signal-members.html">List of all members, including inherited members</a></li>
|
|
<li><a href="q3signal-obsolete.html">Obsolete members</a></li>
|
|
</ul>
|
|
<a name="public-functions"></a>
|
|
<h2>Public Functions</h2>
|
|
<table class="alignedsummary">
|
|
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3signal.html#Q3Signal">Q3Signal</a></b> ( QObject * <i>parent</i> = 0, const char * <i>name</i> = 0 )</td></tr>
|
|
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3signal.html#dtor.Q3Signal">~Q3Signal</a></b> ()</td></tr>
|
|
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3signal.html#activate">activate</a></b> ()</td></tr>
|
|
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3signal.html#connect">connect</a></b> ( const QObject * <i>receiver</i>, const char * <i>member</i> )</td></tr>
|
|
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3signal.html#disconnect">disconnect</a></b> ( const QObject * <i>receiver</i>, const char * <i>member</i> = 0 )</td></tr>
|
|
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3signal.html#setValue">setValue</a></b> ( const QVariant & <i>value</i> )</td></tr>
|
|
<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="q3signal.html#value">value</a></b> () const</td></tr>
|
|
</table>
|
|
<ul>
|
|
<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
|
|
</ul>
|
|
<h3>Additional Inherited Members</h3>
|
|
<ul>
|
|
<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
|
|
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
|
|
<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
|
|
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
|
|
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
|
|
</ul>
|
|
<a name="details"></a>
|
|
<!-- $$$Q3Signal-description -->
|
|
<div class="descr">
|
|
<h2>Detailed Description</h2>
|
|
<p>The Q3Signal class can be used to send signals for classes that don't inherit <a href="qobject.html">QObject</a>.</p>
|
|
<p>If you want to send signals from a class that does not inherit <a href="qobject.html">QObject</a>, you can create an internal Q3Signal object to emit the signal. You must also provide a function that connects the signal to an outside object slot. This is how we used to implement signals in Qt 3's <a href="porting4.html#qmenudata">QMenuData</a> class, which was not a <a href="qobject.html">QObject</a>. In Qt 4, menus contain actions, which are <a href="qtwebkit-bridge.html#qobjects">QObjects</a>.</p>
|
|
<p>In general, we recommend inheriting <a href="qobject.html">QObject</a> instead. <a href="qobject.html">QObject</a> provides much more functionality.</p>
|
|
<p>You can set a single <a href="qvariant.html">QVariant</a> parameter for the signal with <a href="q3signal.html#setValue">setValue</a>().</p>
|
|
<p>Note that <a href="qobject.html">QObject</a> is a <i>private</i> base class of Q3Signal, i.e. you cannot call any <a href="qobject.html">QObject</a> member functions from a Q3Signal object.</p>
|
|
<p>Example:</p>
|
|
<pre class="cpp"> <span class="preprocessor">#include <q3signal.h></span>
|
|
|
|
<span class="keyword">class</span> MyClass
|
|
{
|
|
<span class="keyword">public</span>:
|
|
MyClass();
|
|
<span class="operator">~</span>MyClass();
|
|
|
|
<span class="type">void</span> doSomething();
|
|
|
|
<span class="type">void</span> connect(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>receiver<span class="operator">,</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>member);
|
|
|
|
<span class="keyword">private</span>:
|
|
<span class="type">Q3Signal</span> <span class="operator">*</span>sig;
|
|
};
|
|
|
|
MyClass<span class="operator">::</span>MyClass()
|
|
{
|
|
sig <span class="operator">=</span> <span class="keyword">new</span> <span class="type">Q3Signal</span>;
|
|
}
|
|
|
|
MyClass<span class="operator">::</span><span class="operator">~</span>MyClass()
|
|
{
|
|
<span class="keyword">delete</span> sig;
|
|
}
|
|
|
|
<span class="type">void</span> MyClass<span class="operator">::</span>doSomething()
|
|
{
|
|
<span class="comment">// ... does something</span>
|
|
sig<span class="operator">-</span><span class="operator">></span>activate(); <span class="comment">// emits the signal</span>
|
|
}
|
|
|
|
<span class="type">void</span> MyClass<span class="operator">::</span><a href="q3signal.html#connect">connect</a>(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>receiver<span class="operator">,</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>member)
|
|
{
|
|
sig<span class="operator">-</span><span class="operator">></span>connect(receiver<span class="operator">,</span> member);
|
|
}</pre>
|
|
</div>
|
|
<!-- @@@Q3Signal -->
|
|
<div class="func">
|
|
<h2>Member Function Documentation</h2>
|
|
<!-- $$$Q3Signal[overload1]$$$Q3SignalQObject*constchar* -->
|
|
<h3 class="fn"><a name="Q3Signal"></a>Q3Signal::<span class="name">Q3Signal</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0, const <span class="type">char</span> * <i>name</i> = 0 )</h3>
|
|
<p>Constructs a signal object called <i>name</i>, with the parent object <i>parent</i>. These arguments are passed directly to <a href="qobject.html">QObject</a>.</p>
|
|
<!-- @@@Q3Signal -->
|
|
<!-- $$$~Q3Signal[overload1]$$$~Q3Signal -->
|
|
<h3 class="fn"><a name="dtor.Q3Signal"></a>Q3Signal::<span class="name">~Q3Signal</span> ()</h3>
|
|
<p>Destroys the signal. All connections are removed, as is the case with all <a href="qtwebkit-bridge.html#qobjects">QObjects</a>.</p>
|
|
<!-- @@@~Q3Signal -->
|
|
<!-- $$$activate[overload1]$$$activate -->
|
|
<h3 class="fn"><a name="activate"></a><span class="type">void</span> Q3Signal::<span class="name">activate</span> ()</h3>
|
|
<p>Emits the signal. If the platform supports <a href="qvariant.html">QVariant</a> and a parameter has been set with <a href="q3signal.html#setValue">setValue</a>(), this value is passed in the signal.</p>
|
|
<!-- @@@activate -->
|
|
<!-- $$$connect[overload1]$$$connectconstQObject*constchar* -->
|
|
<h3 class="fn"><a name="connect"></a><span class="type">bool</span> Q3Signal::<span class="name">connect</span> ( const <span class="type"><a href="qobject.html">QObject</a></span> * <i>receiver</i>, const <span class="type">char</span> * <i>member</i> )</h3>
|
|
<p>Connects the signal to <i>member</i> in object <i>receiver</i>. Returns true if the connection is successful.</p>
|
|
<p><b>See also </b><a href="q3signal.html#disconnect">disconnect</a>() and <a href="qobject.html#connect">QObject::connect</a>().</p>
|
|
<!-- @@@connect -->
|
|
<!-- $$$disconnect[overload1]$$$disconnectconstQObject*constchar* -->
|
|
<h3 class="fn"><a name="disconnect"></a><span class="type">bool</span> Q3Signal::<span class="name">disconnect</span> ( const <span class="type"><a href="qobject.html">QObject</a></span> * <i>receiver</i>, const <span class="type">char</span> * <i>member</i> = 0 )</h3>
|
|
<p>Disonnects the signal from <i>member</i> in object <i>receiver</i>. Returns true if the connection existed and the disconnect was successful.</p>
|
|
<p><b>See also </b><a href="q3signal.html#connect">connect</a>() and <a href="qobject.html#disconnect">QObject::disconnect</a>().</p>
|
|
<!-- @@@disconnect -->
|
|
<!-- $$$setValue[overload1]$$$setValueconstQVariant& -->
|
|
<h3 class="fn"><a name="setValue"></a><span class="type">void</span> Q3Signal::<span class="name">setValue</span> ( const <span class="type"><a href="qvariant.html">QVariant</a></span> & <i>value</i> )</h3>
|
|
<p>Sets the signal's parameter to <i>value</i></p>
|
|
<p><b>See also </b><a href="q3signal.html#value">value</a>().</p>
|
|
<!-- @@@setValue -->
|
|
<!-- $$$value[overload1]$$$value -->
|
|
<h3 class="fn"><a name="value"></a><span class="type"><a href="qvariant.html">QVariant</a></span> Q3Signal::<span class="name">value</span> () const</h3>
|
|
<p>Returns the signal's parameter</p>
|
|
<p><b>See also </b><a href="q3signal.html#setValue">setValue</a>().</p>
|
|
<!-- @@@value -->
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="ft">
|
|
<span></span>
|
|
</div>
|
|
</div>
|
|
<div class="footer">
|
|
<p>
|
|
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
|
|
Documentation contributions included herein are the copyrights of
|
|
their respective owners.</p>
|
|
<br />
|
|
<p>
|
|
The documentation provided herein is licensed under the terms of the
|
|
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
|
License version 1.3</a> as published by the Free Software Foundation.</p>
|
|
<p>
|
|
Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
|
www.qt-project.org</a>.</p>
|
|
<br />
|
|
<p>
|
|
Qt and respective logos are trademarks of The Qt Company Ltd
|
|
in Finland and/or other countries worldwide. All other trademarks are property
|
|
of their respective owners. <a title="Privacy Policy"
|
|
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
|
|
</div>
|
|
|
|
<script src="scripts/functions.js" type="text/javascript"></script>
|
|
</body>
|
|
</html>
|