/usr/share/qt5/doc/qtuitools/qtuitools-multipleinheritance-example.html is in qttools5-doc-html 5.9.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- multipleinheritance.qdoc -->
<title>Multiple Inheritance Example | Qt UI Tools 5.9</title>
<link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
<script type="text/javascript">
document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
// loading style sheet breaks anchors that were jumped to before
// so force jumping to anchor again
setTimeout(function() {
var anchor = location.hash;
// need to jump to different anchor first (e.g. none)
location.hash = "#";
setTimeout(function() {
location.hash = anchor;
}, 0);
}, 0);
</script>
</head>
<body>
<div class="header" id="qtdocheader">
<div class="main">
<div class="main-rounded">
<div class="navigationbar">
<table><tr>
<td >Qt 5.9</td><td ><a href="qtuitools-index.html">Qt UI Tools</a></td><td ><a href="examples-qtuitools.html">Qt UI Tools Examples</a></td><td >Multiple Inheritance Example</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
</tr></table>
</div>
</div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#calculatorform-definition">CalculatorForm Definition</a></li>
<li class="level1"><a href="#calculatorform-implementation">CalculatorForm Implementation</a></li>
<li class="level1"><a href="#main-function"><code>main()</code> Function</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">Multiple Inheritance Example</h1>
<span class="subtitle"></span>
<!-- $$$multipleinheritance-description -->
<div class="descr"> <a name="details"></a>
<p>The Multiple Inheritance Example shows how to use a form created with Qt Designer in an application by subclassing both <a href="../qtwidgets/qwidget.html">QWidget</a> and the user interface class, which is <code>Ui::CalculatorForm</code>.</p>
<p class="centerAlign"><img src="images/multipleinheritance-example.png" alt="" /></p><p>To subclass the <code>calculatorform.ui</code> file and ensure that <code>qmake</code> processes it with the <code>uic</code>, we have to include <code>calculatorform.ui</code> in the <code>.pro</code> file, as shown below:</p>
<pre class="cpp">
QT += widgets
HEADERS = calculatorform.h
SOURCES = calculatorform.cpp main.cpp
FORMS = calculatorform.ui
</pre>
<p>When the project is compiled, the <code>uic</code> will generate a corresponding <code>ui_calculatorform.h</code>.</p>
<a name="calculatorform-definition"></a>
<h2 id="calculatorform-definition">CalculatorForm Definition</h2>
<p>In the <code>CalculatorForm</code> definition, we include the <code>ui_calculatorform.h</code> that was generated earlier.</p>
<pre class="cpp">
<span class="preprocessor">#include "ui_calculatorform.h"</span>
</pre>
<p>As mentioned earlier, the class is a subclass of both <a href="../qtwidgets/qwidget.html">QWidget</a> and <code>Ui::CalculatorForm</code>.</p>
<pre class="cpp">
<span class="keyword">class</span> CalculatorForm : <span class="keyword">public</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span><span class="operator">,</span> <span class="keyword">private</span> Ui<span class="operator">::</span>CalculatorForm
{
Q_OBJECT
<span class="keyword">public</span>:
<span class="keyword">explicit</span> CalculatorForm(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> nullptr);
<span class="keyword">private</span> <span class="keyword">slots</span>:
<span class="type">void</span> on_inputSpinBox1_valueChanged(<span class="type">int</span> value);
<span class="type">void</span> on_inputSpinBox2_valueChanged(<span class="type">int</span> value);
};
</pre>
<p>Two slots are defined according to the automatic connection naming convention required by <code>uic</code>. This is to ensure that <a href="../qtcore/qmetaobject.html">QMetaObject</a>'s auto-connection facilities connect all the signals and slots involved automatically.</p>
<a name="calculatorform-implementation"></a>
<h2 id="calculatorform-implementation">CalculatorForm Implementation</h2>
<p>In the constructor, we call <code>setupUi()</code> to load the user interface file. Note that setupUi is a method of <code>Ui::CalculatorForm</code>.</p>
<pre class="cpp">
CalculatorForm<span class="operator">::</span>CalculatorForm(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span>(parent)
{
setupUi(<span class="keyword">this</span>);
}
</pre>
<p>We include two slots, <code>on_inputSpinBox1_valueChanged()</code> and <code>on_inputSpinBox2_valueChanged()</code>. These slots respond to the <a href="../qtwidgets/qspinbox.html#valueChanged-1">valueChanged()</a> signal that both spin boxes emit. Whenever there is a change in one spin box's value, we take that value and add it to whatever value the other spin box has.</p>
<pre class="cpp">
<span class="type">void</span> CalculatorForm<span class="operator">::</span>on_inputSpinBox1_valueChanged(<span class="type">int</span> value)
{
outputWidget<span class="operator">-</span><span class="operator">></span>setText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>number(value <span class="operator">+</span> inputSpinBox2<span class="operator">-</span><span class="operator">></span>value()));
}
<span class="type">void</span> CalculatorForm<span class="operator">::</span>on_inputSpinBox2_valueChanged(<span class="type">int</span> value)
{
outputWidget<span class="operator">-</span><span class="operator">></span>setText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>number(value <span class="operator">+</span> inputSpinBox1<span class="operator">-</span><span class="operator">></span>value()));
}
</pre>
<a name="main-function"></a>
<h2 id="main-function"><code>main()</code> Function</h2>
<p>The <code>main()</code> function instantiates <a href="../qtwidgets/qapplication.html">QApplication</a> and <code>CalculatorForm</code>. The <code>calculator</code> object is displayed by invoking the <a href="../qtwidgets/qwidget.html#show">show()</a> function.</p>
<pre class="cpp">
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
{
<span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
CalculatorForm calculator;
calculator<span class="operator">.</span>show();
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
</pre>
<p>There are various approaches to include forms into applications. The Multiple Inheritance approach is just one of them. See Using a Designer UI File in Your Application for more information on the other approaches available.</p>
<p>Files:</p>
<ul>
<li><a href="qtuitools-multipleinheritance-calculatorform-cpp.html">multipleinheritance/calculatorform.cpp</a></li>
<li><a href="qtuitools-multipleinheritance-calculatorform-h.html">multipleinheritance/calculatorform.h</a></li>
<li><a href="qtuitools-multipleinheritance-calculatorform-ui.html">multipleinheritance/calculatorform.ui</a></li>
<li><a href="qtuitools-multipleinheritance-main-cpp.html">multipleinheritance/main.cpp</a></li>
<li><a href="qtuitools-multipleinheritance-multipleinheritance-pro.html">multipleinheritance/multipleinheritance.pro</a></li>
</ul>
</div>
<!-- @@@multipleinheritance -->
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> 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.<br> 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. </p>
</div>
</body>
</html>
|