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<title>Qt Motif Extension</title>
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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>Qt Motif Extension</h1>

 
<p> <!-- index Motif --><a name="Motif"></a>
<p> This module is part of the <a href="commercialeditions.html">Qt Enterprise
Edition</a> and is <em>not</em> part of the Free or Non-Commercial
Editions.
<p> <h2> Introduction
</h2>
<a name="1"></a><p> The Qt Motif Extension assists the migration of old Xt and Motif based
applications to the more comfortable Qt toolkit.  This extension
replaces the older Xt/Motif Support Extension included with earlier
versions of Qt.
<p> The Qt Motif Extension consists of the following classes:
<p> <ul>
<li> <a href="qmotif.html">QMotif</a> - Provides the basis of the Qt Motif Extension.
<li> <a href="qmotifwidget.html">QMotifWidget</a> - Provides the <a href="qwidget.html">QWidget</a> API for Motif widgets.
<li> <a href="qmotifdialog.html">QMotifDialog</a> - Provides the <a href="qdialog.html">QDialog</a> API for Motif dialogs.
<li> <a href="qxtwidget.html">QXtWidget</a> - The Xt/Motif integration widget from the previous
Xt/Motif extension.  This class is unsupported and has many known
problems and limitations.  It is provided only to keep existing source
working; it should not be used in new code.
</ul>
<p> <h3> Additional Documentation
</h3>
<a name="1-1"></a><p> <ul>
<p> <li> <a href="motif-examples.html">Examples</a>
<li> <a href="motif-walkthrough.html">Migration Walkthrough</a> - A
complete migration of a Motif based program to the Qt toolkit.
<p> </ul>
<p> <h2> Common Problems
</h2>
<a name="2"></a><p> <h3> Incorrect CDE Color Scheme
</h3>
<a name="2-1"></a><p> <a href="qmotifwidget.html">QMotifWidget</a> and <a href="qmotifdialog.html">QMotifDialog</a> will use the same Visual, Colormap
and color depth that <a href="qapplication.html">QApplication</a> uses.  When using CDE, the color
scheme may be incorrect when using a Visual, Colormap and color depth
that is not the default.  To work around this problem, add the
following resource string to your startup files (for example,
<tt>$HOME/.dt/sessions/current/dt.resources</tt>):
<p> <pre>
    *userColorObj: false
</pre>
 
<p> <h3> X11 Header Conflicts
</h3>
<a name="2-2"></a><p> The X11 headers define some constants that conflict with the Qt
headers.  The solution is to include all Qt headers first, followed by
headers from this extension, and all Xt/Motif and X11 headers last.
For example:
<p> <pre>
    // Qt headers first
    #include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
    #include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
    #include &lt;<a href="qsocket-h.html">qsocket.h</a>&gt;
    ...

    // QMotif* headers next
    #include &lt;<a href="qmotif-h.html">qmotif.h</a>&gt;
    #include &lt;<a href="qmotifdialog-h.html">qmotifdialog.h</a>&gt;
    #include &lt;<a href="qmotifwidget-h.html">qmotifwidget.h</a>&gt;

    // Xt/Motif and X11 headers last
    #include &lt;X11/Xlib.h&gt;
    #include &lt;Xt/Intrinsic.h&gt;
    #include &lt;Xm/Xm.h&gt;
    ...
</pre>
 
<p> <h3> Multiple Screen Support
</h3>
<a name="2-3"></a><p> <a href="qmotifwidget.html">QMotifWidget</a> can be used together with <a href="qdesktopwidget.html">QDesktopWidget</a> to create
top-level windows on multiple screens.  A common mistake is to create
a QMotifWidget on a non-default screen while the Xt/Motif widgets are
created on the default screen.  The solution is to specify the screen
to both QMotifWidget and the Xt/Motif child.  For example:
<p> <pre>
    Display *dpy = QMotif::<a href="qmotif.html#x11Display">x11Display</a>();
    Arg args[1];

    // make sure both QMotifWidget and the XmMainWindow are on screen 1
    XtSetArg(args[0], XtNscreen, ScreenOfDisplay(dpy, 1));
    <a href="qmotifwidget.html">QMotifWidget</a> *toplevel =
        new <a href="qmotifwidget.html">QMotifWidget</a>(QApplication::<a href="qapplication.html#desktop">desktop</a>()-&gt;screen(1),
                         xmMainWindowWidgetClass, args, 1, "mainwindow");
</pre>
 
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