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Breadcrumbs go here --> <li><a href="all-examples.html">Examples</a></li> <li>Web Browser Example (ActiveQt)</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"> <h1 class="title">Web Browser Example (ActiveQt)</h1> <span class="subtitle"></span> <!-- $$$activeqt/webbrowser-description --> <div class="descr"> <a name="details"></a> <p>Files:</p> <ul> <li><a href="activeqt-webbrowser-mainwindow-ui.html">activeqt/webbrowser/mainwindow.ui</a></li> <li><a href="activeqt-webbrowser-mainwindow-windowsmobile-ui.html">activeqt/webbrowser/mainwindow_windowsmobile.ui</a></li> <li><a href="activeqt-webbrowser-webaxwidget-h.html">activeqt/webbrowser/webaxwidget.h</a></li> <li><a href="activeqt-webbrowser-main-cpp.html">activeqt/webbrowser/main.cpp</a></li> <li><a href="activeqt-webbrowser-webbrowser-pro.html">activeqt/webbrowser/webbrowser.pro</a></li> </ul> <p>The Web Browser example uses the Microsoft Web Browser ActiveX control to implement a fully functional Web Browser application. The user interface has been developed using the Qt Designer integration of the <a href="qaxwidget.html">QAxWidget</a> class.<p>The code demonstrates how the Qt application can communicate with the embedded ActiveX controls using signals, slots and the dynamicCall() function.</p> <pre class="cpp"> <span class="keyword">class</span> MainWindow : <span class="keyword">public</span> <span class="type"><a href="qmainwindow.html">QMainWindow</a></span><span class="operator">,</span> <span class="keyword">public</span> Ui<span class="operator">::</span>MainWindow { Q_OBJECT <span class="keyword">public</span>: MainWindow(); <span class="keyword">public</span> <span class="keyword">slots</span>: <span class="type">void</span> on_WebBrowser_TitleChange(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>title); <span class="type">void</span> on_WebBrowser_ProgressChange(<span class="type">int</span> a<span class="operator">,</span> <span class="type">int</span> b); <span class="type">void</span> on_WebBrowser_CommandStateChange(<span class="type">int</span> cmd<span class="operator">,</span> <span class="type">bool</span> on); <span class="type">void</span> on_WebBrowser_BeforeNavigate(); <span class="type">void</span> on_WebBrowser_NavigateComplete(<span class="type"><a href="qstring.html">QString</a></span>); <span class="type">void</span> on_actionGo_triggered(); <span class="type">void</span> on_actionNewWindow_triggered(); <span class="type">void</span> on_actionAbout_triggered(); <span class="type">void</span> on_actionAboutQt_triggered(); <span class="type">void</span> on_actionFileClose_triggered(); <span class="keyword">private</span>: <span class="type"><a href="qprogressbar.html">QProgressBar</a></span> <span class="operator">*</span>pb; <span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>addressEdit; };</pre> <p>The <tt>MainWindow</tt> class declares a <tt>QMainWindow</tt> based user interface, using the <tt>Ui::MainWindow</tt> class generated by Qt Designer. A number of slots are implemented to handle events from the various user interface elements, including the <tt>WebBrowser</tt> object, which is a <a href="qaxwidget.html">QAxWidget</a> hosting the Microsoft Web Browser control.</p> <pre class="cpp"> MainWindow<span class="operator">::</span>MainWindow() { setupUi(<span class="keyword">this</span>); addressEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>; tbAddress<span class="operator">-</span><span class="operator">></span>insertWidget(actionGo<span class="operator">,</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Address"</span>))); tbAddress<span class="operator">-</span><span class="operator">></span>insertWidget(actionGo<span class="operator">,</span> addressEdit); connect(addressEdit<span class="operator">,</span> SIGNAL(returnPressed())<span class="operator">,</span> actionGo<span class="operator">,</span> SLOT(trigger())); connect(actionBack<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoBack())); connect(actionForward<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoForward())); connect(actionStop<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(Stop())); connect(actionRefresh<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(Refresh())); connect(actionHome<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoHome())); connect(actionSearch<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoSearch())); pb <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qprogressbar.html">QProgressBar</a></span>(statusBar()); pb<span class="operator">-</span><span class="operator">></span>setTextVisible(<span class="keyword">false</span>); pb<span class="operator">-</span><span class="operator">></span>hide(); statusBar()<span class="operator">-</span><span class="operator">></span>addPermanentWidget(pb); WebBrowser<span class="operator">-</span><span class="operator">></span>dynamicCall(<span class="string">"GoHome()"</span>); }</pre> <p>The constructor initializes the user interface, installs a progress bar on the status bar, and uses <a href="qaxbase.html#dynamicCall">QAxBase::dynamicCall</a>() to invoke the <tt>GoHome()</tt> method of Internet Explorer to navigate to the user's home page.</p> <pre class="cpp"> <span class="type">void</span> MainWindow<span class="operator">::</span>on_WebBrowser_TitleChange(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>title) { setWindowTitle(<span class="string">"Qt WebBrowser - "</span> <span class="operator">+</span> title); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_WebBrowser_ProgressChange(<span class="type">int</span> a<span class="operator">,</span> <span class="type">int</span> b) { <span class="keyword">if</span> (a <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> b <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) { pb<span class="operator">-</span><span class="operator">></span>hide(); <span class="keyword">return</span>; } pb<span class="operator">-</span><span class="operator">></span>show(); pb<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> b); pb<span class="operator">-</span><span class="operator">></span>setValue(a); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_WebBrowser_CommandStateChange(<span class="type">int</span> cmd<span class="operator">,</span> <span class="type">bool</span> on) { <span class="keyword">switch</span> (cmd) { <span class="keyword">case</span> <span class="number">1</span>: actionForward<span class="operator">-</span><span class="operator">></span>setEnabled(on); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="number">2</span>: actionBack<span class="operator">-</span><span class="operator">></span>setEnabled(on); <span class="keyword">break</span>; } } <span class="type">void</span> MainWindow<span class="operator">::</span>on_WebBrowser_BeforeNavigate() { actionStop<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_WebBrowser_NavigateComplete(<span class="type"><a href="qstring.html">QString</a></span>) { actionStop<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>); }</pre> <p>Different slots handle the signals emitted by the WebBrowser object.</p> <p>Connections that don't require any coding, i.e. connecting the <tt>back</tt> action to the <tt>GoBack()</tt> slot, have already been made in Qt Designer.</p> <pre class="cpp"> <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionGo_triggered() { WebBrowser<span class="operator">-</span><span class="operator">></span>dynamicCall(<span class="string">"Navigate(const QString&)"</span><span class="operator">,</span> addressEdit<span class="operator">-</span><span class="operator">></span>text()); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionNewWindow_triggered() { MainWindow <span class="operator">*</span>window <span class="operator">=</span> <span class="keyword">new</span> MainWindow; window<span class="operator">-</span><span class="operator">></span>show(); <span class="keyword">if</span> (addressEdit<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>isEmpty()) <span class="keyword">return</span>; window<span class="operator">-</span><span class="operator">></span>addressEdit<span class="operator">-</span><span class="operator">></span>setText(addressEdit<span class="operator">-</span><span class="operator">></span>text()); window<span class="operator">-</span><span class="operator">></span>actionStop<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>); window<span class="operator">-</span><span class="operator">></span>on_actionGo_triggered(); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionAbout_triggered() { <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About WebBrowser"</span>)<span class="operator">,</span> tr(<span class="string">"This Example has been created using the ActiveQt integration into Qt Designer.\n"</span> <span class="string">"It demonstrates the use of QAxWidget to embed the Internet Explorer ActiveX\n"</span> <span class="string">"control into a Qt application."</span>)); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionAboutQt_triggered() { <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>aboutQt(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About Qt"</span>)); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionFileClose_triggered() { close(); } <span class="preprocessor">#include "main.moc"</span> <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><span class="operator">*</span> argv) { <span class="type"><a href="qapplication.html">QApplication</a></span> a(argc<span class="operator">,</span> argv); MainWindow w; <span class="preprocessor">#if defined(Q_OS_WINCE)</span> w<span class="operator">.</span>showMaximized(); <span class="preprocessor">#else</span> w<span class="operator">.</span>show(); <span class="preprocessor">#endif</span> <span class="keyword">return</span> a<span class="operator">.</span>exec(); }</pre> <p>The rest of the implementation is not related to <a href="activeqt.html#activeqt">ActiveQt</a> - the actions are handled by different slots, and the entry point function starts the application using standard Qt APIs.</p> <p>To build the example you must first build the <a href="qaxcontainer.html">QAxContainer</a> library. Then run your make tool in <tt>examples/activeqt/webbrowser</tt> and run the resulting <tt>webbrowser.exe</tt>.</p> </div> <!-- @@@activeqt/webbrowser --> </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. 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