325 lines
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325 lines
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<li class="level1"><a href="#dialog-class-definition">Dialog Class Definition</a></li>
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<li class="level1"><a href="#dialog-class-implementation">Dialog Class Implementation</a></li>
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<li class="level1"><a href="#the-function">The <tt>main()</tt> function</a></li>
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<h1 class="title">SIP Dialog Example</h1>
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<span class="subtitle"></span>
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<!-- $$$dialogs/sipdialog-description -->
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<div class="descr"> <a name="details"></a>
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<p>Files:</p>
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<ul>
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<li><a href="dialogs-sipdialog-dialog-cpp.html">dialogs/sipdialog/dialog.cpp</a></li>
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<li><a href="dialogs-sipdialog-dialog-h.html">dialogs/sipdialog/dialog.h</a></li>
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<li><a href="dialogs-sipdialog-main-cpp.html">dialogs/sipdialog/main.cpp</a></li>
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<li><a href="dialogs-sipdialog-sipdialog-pro.html">dialogs/sipdialog/sipdialog.pro</a></li>
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</ul>
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<p>The SIP Dialog example shows how to create a dialog that is aware of the Windows Mobile SIP (Software Input Panel) and reacts to it.<table class="generic">
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<tr valign="top" class="odd"><td ><img src="images/sipdialog-closed.png" alt="" /></td><td ><img src="images/sipdialog-opened.png" alt="" /></td></tr>
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</table>
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<p>Sometimes it is necessary for a dialog to take the SIP into account, as the SIP may hide important input widgets. The SIP Dialog Example shows how a <tt>Dialog</tt> object, <tt>dialog</tt>, can be resized accordingly if the SIP is opened, by embedding the contents of <tt>dialog</tt> in a <a href="qscrollarea.html">QScrollArea</a>.</p>
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<a name="dialog-class-definition"></a>
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<h2>Dialog Class Definition</h2>
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<p>The <tt>Dialog</tt> class is a subclass of <a href="qdialog.html">QDialog</a> that implements a public slot, <tt>desktopResized()</tt>, and a public function, <tt>reactToSIP()</tt>. Also, it holds a private instance of <a href="qrect.html">QRect</a>, <tt>desktopGeometry</tt>.</p>
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<pre class="cpp"> <span class="keyword">class</span> Dialog : <span class="keyword">public</span> <span class="type"><a href="qdialog.html">QDialog</a></span>
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{
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Q_OBJECT
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<span class="keyword">public</span>:
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Dialog();
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<span class="type">void</span> reactToSIP();
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<span class="keyword">private</span>:
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<span class="type"><a href="qrect.html">QRect</a></span> desktopGeometry;
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<span class="keyword">public</span> <span class="keyword">slots</span>:
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<span class="type">void</span> desktopResized(<span class="type">int</span> screen);
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};</pre>
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<a name="dialog-class-implementation"></a>
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<h2>Dialog Class Implementation</h2>
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<p>In the constructor of <tt>Dialog</tt>, we start by obtaining the available geometry of the screen with <a href="qdesktopwidget.html#availableGeometry">availableGeometry()</a>. The parameter used is <tt>0</tt> to indicate that we require the primary screen.</p>
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<pre class="cpp"> Dialog<span class="operator">::</span>Dialog()
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{
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desktopGeometry <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">-</span><span class="operator">></span>availableGeometry(<span class="number">0</span>);
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setWindowTitle(tr(<span class="string">"SIP Dialog Example"</span>));
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<span class="type"><a href="qscrollarea.html">QScrollArea</a></span> <span class="operator">*</span>scrollArea <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscrollarea.html">QScrollArea</a></span>(<span class="keyword">this</span>);
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<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>groupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(scrollArea);
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groupBox<span class="operator">-</span><span class="operator">></span>setTitle(tr(<span class="string">"SIP Dialog Example"</span>));
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<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>gridLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>(groupBox);
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groupBox<span class="operator">-</span><span class="operator">></span>setLayout(gridLayout);</pre>
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<p>We set the window's title to "SIP Dialog Example" and declare a <a href="qscrollarea.html">QScrollArea</a> object, <tt>scrollArea</tt>. Next we instantiate a <a href="qgroupbox.html">QGroupBox</a>, <tt>groupBox</tt>, with <tt>scrollArea</tt> as its parent. The title of <tt>groupBox</tt> is also set to "SIP Dialog Example". A <a href="qgridlayout.html">QGridLayout</a> object, <tt>gridLayout</tt>, is then used as <tt>groupBox</tt>'s layout.</p>
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<p>We create a <a href="qlineedit.html">QLineEdit</a>, a <a href="qlabel.html">QLabel</a> and a <a href="qpushbutton.html">QPushButton</a> and we set the <a href="qwidget.html#minimumWidth-prop">minimumWidth</a> property to 220 pixels, respectively.</p>
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<pre class="cpp"> <span class="type"><a href="qlineedit.html">QLineEdit</a></span><span class="operator">*</span> lineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>(groupBox);
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lineEdit<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Open and close the SIP"</span>));
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lineEdit<span class="operator">-</span><span class="operator">></span>setMinimumWidth(<span class="number">220</span>);
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<span class="type"><a href="qlabel.html">QLabel</a></span><span class="operator">*</span> label <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(groupBox);
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label<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"This dialog resizes if the SIP is opened"</span>));
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label<span class="operator">-</span><span class="operator">></span>setMinimumWidth(<span class="number">220</span>);
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<span class="type"><a href="qpushbutton.html">QPushButton</a></span><span class="operator">*</span> button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(groupBox);
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button<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Close Dialog"</span>));
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button<span class="operator">-</span><span class="operator">></span>setMinimumWidth(<span class="number">220</span>);</pre>
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<p>Also, all three widgets' text are set accordingly. The <a href="qgridlayout.html#verticalSpacing-prop">verticalSpacing</a> property of <tt>gridLayout</tt> is set based on the height of <tt>desktopGeometry</tt>. This is to adapt to the different form factors of Windows Mobile. Then, we add our widgets to the layout.</p>
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<pre class="cpp"> <span class="keyword">if</span> (desktopGeometry<span class="operator">.</span>height() <span class="operator"><</span> <span class="number">400</span>)
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gridLayout<span class="operator">-</span><span class="operator">></span>setVerticalSpacing(<span class="number">80</span>);
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<span class="keyword">else</span>
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gridLayout<span class="operator">-</span><span class="operator">></span>setVerticalSpacing(<span class="number">150</span>);
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gridLayout<span class="operator">-</span><span class="operator">></span>addWidget(label);
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gridLayout<span class="operator">-</span><span class="operator">></span>addWidget(lineEdit);
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gridLayout<span class="operator">-</span><span class="operator">></span>addWidget(button);</pre>
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<p>The <tt>scrollArea</tt>'s widget is set to <tt>groupBox</tt>. We use a <a href="qhboxlayout.html">QHBoxLayout</a> object, <tt>layout</tt>, to contain <tt>scrollArea</tt>. The <tt>Dialog</tt>'s layout is set to <tt>layout</tt> and the scroll area's horizontal scroll bar is turned off.</p>
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<pre class="cpp"> scrollArea<span class="operator">-</span><span class="operator">></span>setWidget(groupBox);
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<span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span><span class="operator">*</span> layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>();
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layout<span class="operator">-</span><span class="operator">></span>addWidget(scrollArea);
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setLayout(layout);
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scrollArea<span class="operator">-</span><span class="operator">></span>setHorizontalScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);</pre>
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<p>The following signals are connected to their respective slots:</p>
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<ul>
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<li><tt>button</tt>'s <a href="qabstractbutton.html#pressed">pressed()</a> signal to <a href="qapplication.html">QApplication</a>'s <a href="qapplication.html#closeAllWindows">closeAllWindows()</a> slot,</li>
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<li><a href="qdesktopwidget.html">QDesktopWidget</a>'s <a href="qdesktopwidget.html#workAreaResized">workAreaResized()</a> signal to <tt>dialog</tt>'s <tt>desktopResized()</tt> slot.</li>
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</ul>
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<pre class="cpp"> connect(button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
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qApp<span class="operator">,</span> SLOT(closeAllWindows()));
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connect(<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">,</span> SIGNAL(workAreaResized(<span class="type">int</span>))<span class="operator">,</span>
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<span class="keyword">this</span><span class="operator">,</span> SLOT(desktopResized(<span class="type">int</span>)));
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}</pre>
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<p>The <tt>desktopResized()</tt> function accepts an integer, <i>screen</i>, corresponding to the screen's index. We only invoke <tt>reactToSIP()</tt> if <i>screen</i> is the primary screen (e.g. index = 0).</p>
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<pre class="cpp"> <span class="type">void</span> Dialog<span class="operator">::</span>desktopResized(<span class="type">int</span> screen)
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{
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<span class="keyword">if</span> (screen <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)
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<span class="keyword">return</span>;
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reactToSIP();
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}</pre>
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<p>The <tt>reactToSIP()</tt> function resizes <tt>dialog</tt> accordingly if the desktop's available geometry changed vertically, as this change signifies that the SIP may have been opened or closed.</p>
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<pre class="cpp"> <span class="type">void</span> Dialog<span class="operator">::</span>reactToSIP()
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{
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<span class="type"><a href="qrect.html">QRect</a></span> availableGeometry <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">-</span><span class="operator">></span>availableGeometry(<span class="number">0</span>);
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<span class="keyword">if</span> (desktopGeometry <span class="operator">!</span><span class="operator">=</span> availableGeometry) {
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<span class="keyword">if</span> (windowState() <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WindowMaximized)
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setWindowState(windowState() <span class="operator">&</span> <span class="operator">~</span><span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WindowMaximized);
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setGeometry(availableGeometry);
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}
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desktopGeometry <span class="operator">=</span> availableGeometry;
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}</pre>
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<p>If the height has decreased, we unset the maximized window state. Otherwise, we set the maximized window state. Lastly, we update <tt>desktopGeometry</tt> to the desktop's available geometry.</p>
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<a name="the-function"></a>
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<h2>The <tt>main()</tt> function</h2>
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<p>The <tt>main()</tt> function for the SIP Dialog example instantiates <tt>Dialog</tt> and invokes its <a href="qdialog.html#exec">exec()</a> function.</p>
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<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>)
|
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{
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<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
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Dialog dialog;
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<span class="keyword">return</span> dialog<span class="operator">.</span>exec();
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}</pre>
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<p><b>Note:</b> Although this example uses a dialog, the techniques used here apply to all top-level widgets respectively.</p>
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