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diff --git a/doc/html/motif-walkthrough-5.html b/doc/html/motif-walkthrough-5.html new file mode 100644 index 0000000..357fe93 --- /dev/null +++ b/doc/html/motif-walkthrough-5.html @@ -0,0 +1,109 @@ +<!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 QMotifDialog</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 QMotifDialog</h1> + + + +[ <a href="motif-walkthrough-4.html">Previous: Using Custom QDialogs</a> ] +[ <a href="motif-walkthrough.html">Home</a> ] +[ <a href="motif-walkthrough-6.html">Next: Using Qt 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">QPrinter</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">QDialog</a> replacement. +Instead, we will keep the <a href="motif-extension.html#Motif">Motif</a> based dialog and use <a href="qmotifdialog.html">QMotifDialog</a> to +integrate the dialog with the application. +<p> <h2> Modality Requirements +</h2> +<a name="1"></a><p> Modality with QDialog is different from Motif. The <a href="qdialog.html#exec">QDialog::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 QDialog::exec() style functionality if they +want that behavior. +<p> Since we will be using QMotifDialog (which is a QDialog subclass), we +will need to have an <em>accept</em> and a <em>reject</em> callback for each +dialog we integrate with QMotifDialog. 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">QMotifDialog</a>. First we need to include +the QMotifDialog 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">QMotifWidget</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">QMotifDialog::acceptCallback</a>() and +<a href="qmotifdialog.html#rejectCallback">QMotifDialog::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">QMotifDialog</a>. +<p> [ <a href="motif-walkthrough-4.html">Previous: Using Custom QDialogs</a> ] +[ <a href="motif-walkthrough.html">Home</a> ] +[ <a href="motif-walkthrough-6.html">Next: Using Qt 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>Qt 3.3.8</div> +</table></div></address></body> +</html> |