<!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:1477 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Replacing the Print Dialog</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>Replacing the Print Dialog</h1> [ <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> ] <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> ] <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>