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