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| 6 | <title>Replacing the Print Dialog</title>
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| 32 | <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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| 33 |
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| 34 |
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| 35 |
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| 36 | [ <a href="motif-walkthrough-8.html">Previous: Replacing the View Widget</a> ]
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| 37 | [ <a href="motif-walkthrough.html">Home</a> ]
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| 38 | [ <a href="motif-walkthrough-10.html">Next: Continuing Development</a> ]
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| 39 | <p> The <em>Print</em> dialog is the last component in our application that
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| 40 | uses <a href="motif-extension.html#Motif">Motif</a>. The current <tt>Print()</tt> function does nothing more than
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| 41 | write the plain text to a temporary file, and then executes 'lpr' to
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| 42 | send the text to the printer. Since we will use <a href="qprinter.html">QPrinter</a>, we do not
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| 43 | 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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| 44 | write a new <tt>MainWindow::filePrint()</tt> implementation in <tt>mainwindow.ui.h</tt>.
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| 45 | <p> Note: The steps involved in using the QPrinter class are beyond the
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| 46 | scope of this walkthrough and will not be discussed here. The
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| 47 | QPrinter Class Reference, <a href="qsimplerichtext.html">QSimpleRichText</a> Class Reference and the
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| 48 | <a href="simple-application.html">Simple Application Walkthrough</a>
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| 49 | contain information on the use of QPrinter.
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| 50 | <p> For completeness, the code to initialize a QPrinter object is included below.
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| 51 | <p>
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| 52 |
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| 53 | <pre></pre>
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| 54 | <p> <h2> Using Rich Text for Printing
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| 55 | </h2>
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| 56 | <a name="1"></a><p> Qt provides rich text using a subset of HTML. The QSimpleRichText
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| 57 | class makes rich-text printing simple. All we need to do is create a
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| 58 | string with the proper format tags inserted at the appropriate
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| 59 | places. For our example, we will keep the printing output similar to
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| 60 | previous versions.
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| 61 | <p> First, we create the format tags that we will use.
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| 62 | <p> <pre></pre>
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| 63 | <p> Next we just loop over all pages, appending the page label, contents
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| 64 | and formatting characters to a <tt>printtext</tt> variable (which is a
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| 65 | <a href="qstring.html">QString</a>).
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| 66 | <p> <pre></pre>
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| 67 | <p> The rest of the <tt>MainWindow::filePrint()</tt> function is the actual
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| 68 | printing code. Here we simply create a <a href="qsimplerichtext.html">QSimpleRichText</a> object using
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| 69 | the string we created above, and draw this string on the <a href="qprinter.html">QPrinter</a>
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| 70 | object using <a href="qpainter.html">QPainter</a>.
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| 71 | <p> <pre></pre>
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| 72 | <p> <h2> Removing the Dependency on Xt/Motif
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| 73 | </h2>
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| 74 | <a name="2"></a><p> Our application no longer uses any Xt or Motif widgets. We can now
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| 75 | finish removing the dependencies on Xt and Motif.
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| 76 | <p> First, we cleanup the <tt>#include</tt> statements in <tt>mainwindow.ui.h</tt>.
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| 77 | <p>
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| 78 |
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| 79 | <p> <pre></pre><pre></pre>
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| 80 | <p> The <tt>MainWindow::fileNew()</tt> function uses the <tt>Boolean</tt> and <tt>False</tt>
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| 81 | keywords from the Xt library. C++ has these built into the language,
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| 82 | so we use <tt>bool</tt> and <tt>false</tt> instead.
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| 83 | <p> The last modification needed to completely remove Xt and Motif from
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| 84 | our application is to stop using the <a href="qmotif.html">QMotif</a> class. We remove the
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| 85 | qmotif.h <tt>#include</tt> statement from <tt>todo.cpp</tt>, and remove the
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| 86 | instantiation from the <tt>main()</tt> function.
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| 87 | <p> After doing this, we can remove the <tt>-lXm</tt> and <tt>-lqmotif</tt> from the
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| 88 | <tt>LIBS</tt> variable in our project file. Our project file also contains
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| 89 | source and headers for the the old custom Motif widgets previously
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| 90 | used in our application. We remove these as well.
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| 91 | <p> After regenerating the <tt>Makefile</tt> and building our project, we
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| 92 | confirm that the application works correctly.
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| 93 | <p> [ <a href="motif-walkthrough-8.html">Previous: Replacing the View Widget</a> ]
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| 94 | [ <a href="motif-walkthrough.html">Home</a> ]
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| 95 | [ <a href="motif-walkthrough-10.html">Next: Continuing Development</a> ]
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| 96 | <p>
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