351 lines
21 KiB
HTML
351 lines
21 KiB
HTML
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<h1 class="title">Web Browser Example (ActiveQt)</h1>
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<span class="subtitle"></span>
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<!-- $$$activeqt/webbrowser-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="activeqt-webbrowser-mainwindow-ui.html">activeqt/webbrowser/mainwindow.ui</a></li>
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<li><a href="activeqt-webbrowser-mainwindow-windowsmobile-ui.html">activeqt/webbrowser/mainwindow_windowsmobile.ui</a></li>
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<li><a href="activeqt-webbrowser-webaxwidget-h.html">activeqt/webbrowser/webaxwidget.h</a></li>
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<li><a href="activeqt-webbrowser-main-cpp.html">activeqt/webbrowser/main.cpp</a></li>
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<li><a href="activeqt-webbrowser-webbrowser-pro.html">activeqt/webbrowser/webbrowser.pro</a></li>
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<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>
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<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
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{
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Q_OBJECT
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<span class="keyword">public</span>:
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MainWindow();
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<span class="keyword">public</span> <span class="keyword">slots</span>:
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<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);
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<span class="type">void</span> on_WebBrowser_ProgressChange(<span class="type">int</span> a<span class="operator">,</span> <span class="type">int</span> b);
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<span class="type">void</span> on_WebBrowser_CommandStateChange(<span class="type">int</span> cmd<span class="operator">,</span> <span class="type">bool</span> on);
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<span class="type">void</span> on_WebBrowser_BeforeNavigate();
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<span class="type">void</span> on_WebBrowser_NavigateComplete(<span class="type"><a href="qstring.html">QString</a></span>);
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<span class="type">void</span> on_actionGo_triggered();
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<span class="type">void</span> on_actionNewWindow_triggered();
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<span class="type">void</span> on_actionAbout_triggered();
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<span class="type">void</span> on_actionAboutQt_triggered();
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<span class="type">void</span> on_actionFileClose_triggered();
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<span class="keyword">private</span>:
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<span class="type"><a href="qprogressbar.html">QProgressBar</a></span> <span class="operator">*</span>pb;
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<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>addressEdit;
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};</pre>
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<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>
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<pre class="cpp"> MainWindow<span class="operator">::</span>MainWindow()
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{
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setupUi(<span class="keyword">this</span>);
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addressEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>;
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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>)));
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tbAddress<span class="operator">-</span><span class="operator">></span>insertWidget(actionGo<span class="operator">,</span> addressEdit);
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connect(addressEdit<span class="operator">,</span> SIGNAL(returnPressed())<span class="operator">,</span> actionGo<span class="operator">,</span> SLOT(trigger()));
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connect(actionBack<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoBack()));
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connect(actionForward<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoForward()));
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connect(actionStop<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(Stop()));
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connect(actionRefresh<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(Refresh()));
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connect(actionHome<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoHome()));
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connect(actionSearch<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> WebBrowser<span class="operator">,</span> SLOT(GoSearch()));
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pb <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qprogressbar.html">QProgressBar</a></span>(statusBar());
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pb<span class="operator">-</span><span class="operator">></span>setTextVisible(<span class="keyword">false</span>);
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pb<span class="operator">-</span><span class="operator">></span>hide();
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statusBar()<span class="operator">-</span><span class="operator">></span>addPermanentWidget(pb);
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WebBrowser<span class="operator">-</span><span class="operator">></span>dynamicCall(<span class="string">"GoHome()"</span>);
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}</pre>
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<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>
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<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)
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{
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setWindowTitle(<span class="string">"Qt WebBrowser - "</span> <span class="operator">+</span> title);
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}
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<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)
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{
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<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>) {
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pb<span class="operator">-</span><span class="operator">></span>hide();
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<span class="keyword">return</span>;
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}
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pb<span class="operator">-</span><span class="operator">></span>show();
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pb<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> b);
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pb<span class="operator">-</span><span class="operator">></span>setValue(a);
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}
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<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)
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{
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<span class="keyword">switch</span> (cmd) {
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<span class="keyword">case</span> <span class="number">1</span>:
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actionForward<span class="operator">-</span><span class="operator">></span>setEnabled(on);
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<span class="keyword">break</span>;
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<span class="keyword">case</span> <span class="number">2</span>:
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actionBack<span class="operator">-</span><span class="operator">></span>setEnabled(on);
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<span class="keyword">break</span>;
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}
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>on_WebBrowser_BeforeNavigate()
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{
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actionStop<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>on_WebBrowser_NavigateComplete(<span class="type"><a href="qstring.html">QString</a></span>)
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{
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actionStop<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
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}</pre>
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<p>Different slots handle the signals emitted by the WebBrowser object.</p>
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<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>
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<pre class="cpp"> <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionGo_triggered()
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{
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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());
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>on_actionNewWindow_triggered()
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{
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MainWindow <span class="operator">*</span>window <span class="operator">=</span> <span class="keyword">new</span> MainWindow;
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window<span class="operator">-</span><span class="operator">></span>show();
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<span class="keyword">if</span> (addressEdit<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>isEmpty())
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<span class="keyword">return</span>;
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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());
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window<span class="operator">-</span><span class="operator">></span>actionStop<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
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window<span class="operator">-</span><span class="operator">></span>on_actionGo_triggered();
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>on_actionAbout_triggered()
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{
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<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>
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tr(<span class="string">"This Example has been created using the ActiveQt integration into Qt Designer.\n"</span>
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<span class="string">"It demonstrates the use of QAxWidget to embed the Internet Explorer ActiveX\n"</span>
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<span class="string">"control into a Qt application."</span>));
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>on_actionAboutQt_triggered()
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{
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<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>));
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>on_actionFileClose_triggered()
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{
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close();
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}
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<span class="preprocessor">#include "main.moc"</span>
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<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)
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{
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<span class="type"><a href="qapplication.html">QApplication</a></span> a(argc<span class="operator">,</span> argv);
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MainWindow w;
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<span class="preprocessor">#if defined(Q_OS_WINCE)</span>
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w<span class="operator">.</span>showMaximized();
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<span class="preprocessor">#else</span>
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w<span class="operator">.</span>show();
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<span class="preprocessor">#endif</span>
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<span class="keyword">return</span> a<span class="operator">.</span>exec();
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}</pre>
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<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>
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<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>
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