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130 lines
7.2 KiB
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Using TQt Main Window Classes</h1>
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[ <a href="motif-walkthrough-5.html">Previous: Using Existing Dialogs with TQMotifDialog</a> ]
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[ <a href="motif-walkthrough.html">Home</a> ]
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[ <a href="motif-walkthrough-7.html">Next: Refactoring Existing Code</a> ]
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<p> After we have replaced all the dialogs, we are ready to begin replacing
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the <em>Main Window</em>. <a href="motif-walkthrough.html#4">As mentioned
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above</a>, we will replace the existing <tt>XmMainWindow</tt> and
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popup-menu heirarchy with <a href="application.html">TQt Main Window
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Classes</a>.
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<p> We will use <a href="designer-manual.html">TQt Designer</a> to design
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our new main window.
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<p> <h2> Implementing the <em>Main Window</em>
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</h2>
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<a name="1"></a><p> The description for the <em>Main Window</em> is saved as <tt>mainwindow.ui</tt>.
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We add this file to the project file and regenerate the <tt>Makefile</tt>.
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The <em>uic</em> utility generates the code for our <em>Main Window</em>, which
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is then compiled and linked into our application.
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<p> <em>TQt Designer</em> also created the <tt>mainwindow.ui.h</tt> file. We need to
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add the implementation for our <em>Main Window</em> to this skeleton
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implementation.
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<p> We begin by adding the necessary includes for <a href="ntqapplication.html">TQApplication</a>
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and <a href="qmotifwidget.html">TQMotifWidget</a>.
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<p>
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<p> <pre></pre>
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<p> We need includes for the <a href="motif-extension.html#Motif">Motif</a> callback structs and the <tt>XmdPrint</tt>
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widget.
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<p> <pre></pre><pre></pre>
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<p> We are now ready to add implementations for the slots in our <em>Main Window</em>. We have one slot per menu item. Each slot will call the
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existing callback functions found in <tt>todo.cpp</tt> and <tt>actions.cpp</tt>.
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<p> <center><table cellpadding="4" cellspacing="2" border="0">
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<tr bgcolor="#a2c511"> <th valign="top" colspan="3" rowspan="1"> File menu
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<tr bgcolor="#f0f0f0"> <td valign="top">New <td valign="top"><tt>MainWindow::fileNew()</tt> <td valign="top">calls the <tt>New()</tt> callback
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<tr bgcolor="#d0d0d0"> <td valign="top">Open <td valign="top"><tt>MainWindow::fileOpen()</tt> <td valign="top">calls the <tt>Open()</tt> callback
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<tr bgcolor="#f0f0f0"> <td valign="top">Save <td valign="top"><tt>MainWindow::fileSave()</tt> <td valign="top">calls the <tt>SaveIt()</tt> callback
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<tr bgcolor="#d0d0d0"> <td valign="top">Save As <td valign="top"><tt>MainWindow::fileSaveAs()</tt> <td valign="top">calls the <tt>Save()</tt> callback
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<tr bgcolor="#f0f0f0"> <td valign="top">Print <td valign="top"><tt>MainWindow::filePrint()</tt> <td valign="top">calls the <tt>ShowPrintDialog()</tt> callback
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<tr bgcolor="#d0d0d0"> <td valign="top">Exit <td valign="top"><tt>MainWindow::fileExit()</tt> <td valign="top">calls <a href="ntqapplication.html#quit">TQApplication::quit</a>()
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<tr bgcolor="#a2c511"> <th valign="top" colspan="3" rowspan="1"> Selected menu
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<tr bgcolor="#f0f0f0"> <td valign="top">Properties <td valign="top"><tt>MainWindow::selProperties()</tt> <td valign="top">calls the <tt>EditPage()</tt> callback
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<tr bgcolor="#d0d0d0"> <td valign="top">New <td valign="top"><tt>MainWindow::selNewPage()</tt> <td valign="top">calls the <tt>NewPage()</tt> callback
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<tr bgcolor="#f0f0f0"> <td valign="top">Delete to Trash <td valign="top"><tt>MainWindow::selDeletePage()</tt> <td valign="top">calls the <tt>DeletePage()</tt> callback
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</table></center>
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<p> We need to add forward declarations for these callbacks before we can
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use them.
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<p> <pre></pre>
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<p> Each of the existing callback functions takes three arguments. We pass
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<em>NULL</em> to all of the arguments in this example (with a few exceptions,
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see below). The existing code does not rely on any of the arguments.
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Each slot implementation is a single line calling the related callback
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function. The code is not very interesting and would just take up
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space, so we've omitted it.
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<p> There are four exceptions to the above. The <tt>Open()</tt>, <tt>Save()</tt>, <tt>EditPage()</tt> and <tt>DeletePage()</tt> callbacks accept a pointer to the
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toplevel <a href="ntqwidget.html">TQWidget</a> as argument 2 (the <em>client_data</em> argument). For
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these four functions, we pass <em>this</em> as the second argument, which is
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a toplevel <tt>MainWindow</tt> derived from <a href="ntqmainwindow.html">TQMainWindow</a>.
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<p> <h2> Replacing the <em>Main Window</em>
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</h2>
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<a name="2"></a><p> The next step is to use the new <em>Main Window</em> in our application.
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The changes needed in <tt>todo.cpp</tt> are large due to the large amount of
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code being removed.
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<p> First, we add the include for our new <em>Main Window</em>.
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<p>
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<p> <pre></pre>
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<p> We can cleanup the Motif includes, since many of them are no longer
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needed.
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<p> <pre></pre><pre></pre><pre></pre>
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<p> The <tt>QuitAppl()</tt> and <tt>manageCB()</tt> callbacks are not needed any more,
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so we remove them. We do not need the global <tt>shell</tt> variable
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either. We remove it and all references to it in the <tt>New()</tt>, <tt>Save()</tt> and <tt>Open()</tt> callbacks.
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<p> In <tt>main()</tt>, we make the large changes. First, we use our new <tt>MainWindow</tt> instead of <a href="qmotifwidget.html">TQMotifWidget</a> with <tt>XmMainWindow</tt>.
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<p>
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<p> <pre></pre>
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<p> We will now use TQMotifWidget to create the <tt>XmNotebook</tt> widget.
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<p> <pre></pre>
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<p> We remove all of the code used to create the Motif menus. The
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remaining code in <tt>main()</tt> is self-explanatory.
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<p> <pre></pre>
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<p> Our application is now using <a href="ntqmainwindow.html">TQMainWindow</a> instead of <tt>XmMainWindow</tt>.
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After we build the project, the application runs and operates as
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expected.
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<p> [ <a href="motif-walkthrough-5.html">Previous: Using Existing Dialogs with TQMotifDialog</a> ]
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[ <a href="motif-walkthrough.html">Home</a> ]
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[ <a href="motif-walkthrough-7.html">Next: Refactoring Existing Code</a> ]
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<p>
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