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105 lines
5.1 KiB
105 lines
5.1 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/motif/doc/walkthrough.doc:1477 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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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>
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[ <a href="motif-walkthrough-8.html">Previous: Replacing the View Widget</a> ]
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[ <a href="motif-walkthrough.html">Home</a> ]
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[ <a href="motif-walkthrough-10.html">Next: Continuing Development</a> ]
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<p> The <em>Print</em> dialog is the last component in our application that
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uses <a href="motif-extension.html#Motif">Motif</a>. The current <tt>Print()</tt> function does nothing more than
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write the plain text to a temporary file, and then executes 'lpr' to
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send the text to the printer. Since we will use <a href="qprinter.html">TQPrinter</a>, we do not
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this function any more, so we remove it. The current <tt>MainWindow::filePrint()</tt> implementation is removed as well. We will
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write a new <tt>MainWindow::filePrint()</tt> implementation in <tt>mainwindow.ui.h</tt>.
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<p> Note: The steps involved in using the TQPrinter class are beyond the
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scope of this walkthrough and will not be discussed here. The
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TQPrinter Class Reference, <a href="qsimplerichtext.html">TQSimpleRichText</a> Class Reference and the
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<a href="simple-application.html">Simple Application Walkthrough</a>
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contain information on the use of TQPrinter.
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<p> For completeness, the code to initialize a TQPrinter object is included below.
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<p>
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<pre></pre>
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<p> <h2> Using Rich Text for Printing
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</h2>
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<a name="1"></a><p> TQt provides rich text using a subset of HTML. The TQSimpleRichText
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class makes rich-text printing simple. All we need to do is create a
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string with the proper format tags inserted at the appropriate
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places. For our example, we will keep the printing output similar to
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previous versions.
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<p> First, we create the format tags that we will use.
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<p> <pre></pre>
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<p> Next we just loop over all pages, appending the page label, contents
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and formatting characters to a <tt>printtext</tt> variable (which is a
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<a href="qstring.html">TQString</a>).
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<p> <pre></pre>
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<p> The rest of the <tt>MainWindow::filePrint()</tt> function is the actual
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printing code. Here we simply create a <a href="qsimplerichtext.html">TQSimpleRichText</a> object using
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the string we created above, and draw this string on the <a href="qprinter.html">TQPrinter</a>
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object using <a href="qpainter.html">TQPainter</a>.
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<p> <pre></pre>
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<p> <h2> Removing the Dependency on Xt/Motif
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</h2>
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<a name="2"></a><p> Our application no longer uses any Xt or Motif widgets. We can now
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finish removing the dependencies on Xt and Motif.
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<p> First, we cleanup the <tt>#include</tt> statements in <tt>mainwindow.ui.h</tt>.
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<p>
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<p> <pre></pre><pre></pre>
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<p> The <tt>MainWindow::fileNew()</tt> function uses the <tt>Boolean</tt> and <tt>False</tt>
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keywords from the Xt library. C++ has these built into the language,
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so we use <tt>bool</tt> and <tt>false</tt> instead.
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<p> The last modification needed to completely remove Xt and Motif from
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our application is to stop using the <a href="qmotif.html">TQMotif</a> class. We remove the
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qmotif.h <tt>#include</tt> statement from <tt>todo.cpp</tt>, and remove the
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instantiation from the <tt>main()</tt> function.
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<p> After doing this, we can remove the <tt>-lXm</tt> and <tt>-lqmotif</tt> from the
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<tt>LIBS</tt> variable in our project file. Our project file also contains
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source and headers for the the old custom Motif widgets previously
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used in our application. We remove these as well.
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<p> After regenerating the <tt>Makefile</tt> and building our project, we
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confirm that the application works correctly.
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<p> [ <a href="motif-walkthrough-8.html">Previous: Replacing the View Widget</a> ]
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[ <a href="motif-walkthrough.html">Home</a> ]
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[ <a href="motif-walkthrough-10.html">Next: Continuing Development</a> ]
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<p>
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<p><address><hr><div align=center>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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