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<title>Replacing the Print Dialog</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>Replacing the Print Dialog</h1>
[ <a href="motif-walkthrough-8.html">Previous: Replacing the View Widget</a> ]
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[ <a href="motif-walkthrough-10.html">Next: Continuing Development</a> ]
<p> The <em>Print</em> dialog is the last component in our application that
uses <a href="motif-extension.html#Motif">Motif</a>. The current <tt>Print()</tt> function does nothing more than
write the plain text to a temporary file, and then executes 'lpr' to
send the text to the printer. Since we will use <a href="qprinter.html">QPrinter</a>, we do not
this function any more, so we remove it. The current <tt>MainWindow::filePrint()</tt> implementation is removed as well. We will
write a new <tt>MainWindow::filePrint()</tt> implementation in <tt>mainwindow.ui.h</tt>.
<p> Note: The steps involved in using the QPrinter class are beyond the
scope of this walkthrough and will not be discussed here. The
QPrinter Class Reference, <a href="qsimplerichtext.html">QSimpleRichText</a> Class Reference and the
<a href="simple-application.html">Simple Application Walkthrough</a>
contain information on the use of QPrinter.
<p> For completeness, the code to initialize a QPrinter object is included below.
<p>
<pre></pre>
<p> <h2> Using Rich Text for Printing
</h2>
<a name="1"></a><p> Qt provides rich text using a subset of HTML. The QSimpleRichText
class makes rich-text printing simple. All we need to do is create a
string with the proper format tags inserted at the appropriate
places. For our example, we will keep the printing output similar to
previous versions.
<p> First, we create the format tags that we will use.
<p> <pre></pre>
<p> Next we just loop over all pages, appending the page label, contents
and formatting characters to a <tt>printtext</tt> variable (which is a
<a href="qstring.html">QString</a>).
<p> <pre></pre>
<p> The rest of the <tt>MainWindow::filePrint()</tt> function is the actual
printing code. Here we simply create a <a href="qsimplerichtext.html">QSimpleRichText</a> object using
the string we created above, and draw this string on the <a href="qprinter.html">QPrinter</a>
object using <a href="qpainter.html">QPainter</a>.
<p> <pre></pre>
<p> <h2> Removing the Dependency on Xt/Motif
</h2>
<a name="2"></a><p> Our application no longer uses any Xt or Motif widgets. We can now
finish removing the dependencies on Xt and Motif.
<p> First, we cleanup the <tt>#include</tt> statements in <tt>mainwindow.ui.h</tt>.
<p>
<p> <pre></pre><pre></pre>
<p> The <tt>MainWindow::fileNew()</tt> function uses the <tt>Boolean</tt> and <tt>False</tt>
keywords from the Xt library. C++ has these built into the language,
so we use <tt>bool</tt> and <tt>false</tt> instead.
<p> The last modification needed to completely remove Xt and Motif from
our application is to stop using the <a href="qmotif.html">QMotif</a> class. We remove the
qmotif.h <tt>#include</tt> statement from <tt>todo.cpp</tt>, and remove the
instantiation from the <tt>main()</tt> function.
<p> After doing this, we can remove the <tt>-lXm</tt> and <tt>-lqmotif</tt> from the
<tt>LIBS</tt> variable in our project file. Our project file also contains
source and headers for the the old custom Motif widgets previously
used in our application. We remove these as well.
<p> After regenerating the <tt>Makefile</tt> and building our project, we
confirm that the application works correctly.
<p> [ <a href="motif-walkthrough-8.html">Previous: Replacing the View Widget</a> ]
[ <a href="motif-walkthrough.html">Home</a> ]
[ <a href="motif-walkthrough-10.html">Next: Continuing Development</a> ]
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