You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
110 lines
5.4 KiB
110 lines
5.4 KiB
13 years ago
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
||
|
|
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/motif/doc/walkthrough.doc:661 -->
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||
|
|
<title>Using Existing Dialogs with TQMotifDialog</title>
|
||
|
|
<style type="text/css"><!--
|
||
|
|
fn { margin-left: 1cm; text-indent: -1cm; }
|
||
|
|
a:link { color: #004faf; text-decoration: none }
|
||
|
|
a:visited { color: #672967; text-decoration: none }
|
||
|
|
body { background: #ffffff; color: black; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
|
||
|
|
<table border="0" cellpadding="0" cellspacing="0" width="100%">
|
||
|
|
<tr bgcolor="#E5E5E5">
|
||
|
|
<td valign=center>
|
||
|
|
<a href="index.html">
|
||
|
|
<font color="#004faf">Home</font></a>
|
||
|
|
| <a href="classes.html">
|
||
|
|
<font color="#004faf">All Classes</font></a>
|
||
|
|
| <a href="mainclasses.html">
|
||
|
|
<font color="#004faf">Main Classes</font></a>
|
||
|
|
| <a href="annotated.html">
|
||
|
|
<font color="#004faf">Annotated</font></a>
|
||
|
|
| <a href="groups.html">
|
||
|
|
<font color="#004faf">Grouped Classes</font></a>
|
||
|
|
| <a href="functions.html">
|
||
|
|
<font color="#004faf">Functions</font></a>
|
||
|
|
</td>
|
||
|
|
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Using Existing Dialogs with TQMotifDialog</h1>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
[ <a href="motif-walkthrough-4.html">Previous: Using Custom TQDialogs</a> ]
|
||
|
|
[ <a href="motif-walkthrough.html">Home</a> ]
|
||
|
|
[ <a href="motif-walkthrough-6.html">Next: Using TQt Main Window Classes</a> ]
|
||
|
|
<p> As mentioned earlier, the <em>Print</em> dialog cannot be replaced until we
|
||
|
|
have converted the <em>View</em> widget. The <em>Print</em> dialog will be
|
||
|
|
removed once we have finished our migration, since we will use
|
||
|
|
<a href="qprinter.html">TQPrinter</a> instead. Based on this information, we decide that it is not
|
||
|
|
worth replacing the <em>Print</em> dialog with a custom <a href="qdialog.html">TQDialog</a> replacement.
|
||
|
|
Instead, we will keep the <a href="motif-extension.html#Motif">Motif</a> based dialog and use <a href="qmotifdialog.html">TQMotifDialog</a> to
|
||
|
|
integrate the dialog with the application.
|
||
|
|
<p> <h2> Modality Retquirements
|
||
|
|
</h2>
|
||
|
|
<a name="1"></a><p> Modality with TQDialog is different from Motif. The <a href="qdialog.html#exec">TQDialog::exec</a>()
|
||
|
|
function does not return until the dialog is finished. In Motif,
|
||
|
|
modality is simply a property of the shell, and the application
|
||
|
|
programmer must write TQDialog::exec() style functionality if they
|
||
|
|
want that behavior.
|
||
|
|
<p> Since we will be using TQMotifDialog (which is a TQDialog subclass), we
|
||
|
|
will need to have an <em>accept</em> and a <em>reject</em> callback for each
|
||
|
|
dialog we integrate with TQMotifDialog. The predefined Motif dialogs
|
||
|
|
have these already: the <tt>XmNokCallback</tt> and <tt>XmNcancelCallback</tt>
|
||
|
|
callbacks. However, the <em>Print</em> dialog only has an <em>accept</em> callback
|
||
|
|
(the <tt>XmdNprintCallback</tt>), but it does not have a <em>reject</em> callback.
|
||
|
|
We need to add this.
|
||
|
|
<p> This is easily done. We add an <tt>XtCallbackList</tt> for the <tt>XmNcancelCallback</tt> callback in <tt>Xmd/PrintP.h</tt>:
|
||
|
|
<p>
|
||
|
|
|
||
|
|
<pre></pre>
|
||
|
|
<p> We add the <tt>XmNcancelCallback</tt> callback to the list of resources for
|
||
|
|
the <tt>XmdPrint</tt> widget class in <tt>Xmd/Print.c</tt>:
|
||
|
|
<p>
|
||
|
|
|
||
|
|
<pre></pre>
|
||
|
|
<p> We need to activate this callback whenever we unmanage the widget and
|
||
|
|
do not activate the <em>print</em> callback, which is in the <tt>do_help_cb()</tt>
|
||
|
|
function:
|
||
|
|
<p> <pre></pre>
|
||
|
|
<p> ... and in the unmanage_cb() function:
|
||
|
|
<p> <pre></pre>
|
||
|
|
<p> <h2> Integrating the <em>Print</em> Dialog
|
||
|
|
</h2>
|
||
|
|
<a name="2"></a><p> Now that the <em>Print</em> dialog has the appropriate <em>accept</em> and <em>reject</em> callbacks, we can use <a href="qmotifdialog.html">TQMotifDialog</a>. First we need to include
|
||
|
|
the TQMotifDialog header in <tt>todo.cpp</tt>.
|
||
|
|
<p>
|
||
|
|
|
||
|
|
<p> <pre></pre>
|
||
|
|
<p> We add a <tt>ShowPrintDialog()</tt> function which will create and execute the
|
||
|
|
print dialog.
|
||
|
|
<p> <pre></pre>
|
||
|
|
<p> We change the <em>Print</em> menu item callback to call the new <tt>ShowPrintDialog()</tt> function. We pass the top-level <a href="qmotifwidget.html">TQMotifWidget</a>, which
|
||
|
|
we will use as the parent for the dialog.
|
||
|
|
<p> <pre></pre>
|
||
|
|
<p> The <tt>ShowPrintDialog()</tt> function creates the <em>Print</em> dialog and
|
||
|
|
executes it. We use the <tt>XmdNprintCallback</tt> callback to accept the
|
||
|
|
dialog and the <tt>XmNcancelCallback</tt> callback to reject the dialog. We
|
||
|
|
can do this easily by using the <a href="qmotifdialog.html#acceptCallback">TQMotifDialog::acceptCallback</a>() and
|
||
|
|
<a href="qmotifdialog.html#rejectCallback">TQMotifDialog::rejectCallback</a>() functions, respectively. We also
|
||
|
|
ensure that the <em>print</em> callback continues to call the <tt>Print()</tt> function as before.
|
||
|
|
<p> <pre></pre>
|
||
|
|
<p> After we build the project, the application runs and operates as
|
||
|
|
expected. There is no visual or behavioral difference, even though
|
||
|
|
the <em>Print</em> dialog is using <a href="qmotifdialog.html">TQMotifDialog</a>.
|
||
|
|
<p> [ <a href="motif-walkthrough-4.html">Previous: Using Custom TQDialogs</a> ]
|
||
|
|
[ <a href="motif-walkthrough.html">Home</a> ]
|
||
|
|
[ <a href="motif-walkthrough-6.html">Next: Using TQt Main Window Classes</a> ]
|
||
|
|
<p>
|
||
|
|
<!-- eof -->
|
||
|
|
<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|