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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/motif-walkthrough-10.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/motif-walkthrough-10.html')
| -rw-r--r-- | doc/html/motif-walkthrough-10.html | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/doc/html/motif-walkthrough-10.html b/doc/html/motif-walkthrough-10.html new file mode 100644 index 0000000..df73975 --- /dev/null +++ b/doc/html/motif-walkthrough-10.html @@ -0,0 +1,106 @@ +<!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:1579 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>Continuing Development</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>Continuing Development</h1> + + + +[ <a href="motif-walkthrough-9.html">Previous: Replacing the Print Dialog</a> ] +[ <a href="motif-walkthrough.html">Home</a> ] +<p> We have not quite finished with the migration to Qt, even though our +project does not use <a href="motif-extension.html#Motif">Motif</a> any more. Qt provides many useful features +that we can begin using immediately. Some of the most interesting +ones are presented below as a guide for where to start extending your +existing projects. +<p> <h2> Using Unicode +</h2> +<a name="1"></a><p> Support for <a href="i18n.html">internationalization</a> is very easy +with Qt. Using <a href="qstring.html">QString</a> instead of <tt>char*</tt> for storing text gives +us support for most of the written languages around the world. Our <tt>Page</tt> and <tt>Options</tt> structs look much simpler now. +<p> + +<p> <pre></pre> +<p> <pre></pre> +<p> All functions that use the <tt>Page</tt> and <tt>Options</tt> structs need to be +updated to use QString properly. Since QString is also an <a href="shclass.html#implicitly-shared">implicitly shared</a> class, we no longer have to do any memory management with our +strings. We can remove all occurences of the <a href="qcstring.html#qstrdup">qstrdup</a>() function, +and we never need to use <em>new</em> or <em>delete</em> when done with a string. +QString will allocate and delete data when needed. +<p> Here are the <tt>MainWindow::fileOpen()</tt> and <tt>MainWindow::pageChange()</tt> +functions from <tt>mainwindow.ui.h</tt>. Notice that the code no longer +uses <em>delete</em> or <a href="qcstring.html#qstrdup">qstrdup</a>() when storing text. +<p> + +<p> <pre></pre> +<p> <pre> + ... +</pre> + +<p> <pre></pre> +<p> Almost all of the functions in our application are affected by this +change. In most cases, we end up removing more code than we are +adding. To keep the size of this walkthrough reasonable, we've only +shown a small portion of the required changes, since the changes are +very similar to those shown above. +<p> <h2> Writing Platform-Independent Code +</h2> +<a name="2"></a><p> Qt provides many <a href="io.html">input and output</a> classes. We +can use these in <tt>MainWindow::readDB()</tt> and <tt>MainWindow::saveDB()</tt>. +Currently, these functions use functions only found on UNIX machines. +Using <a href="qfile.html">QFile</a> and <a href="qtextstream.html">QTextStream</a> removes this dependency on UNIX, and we can +begin building and testing our application on Microsoft Windows and +Apple Mac OS X. +<p> The platform-independent versions of the <tt>MainWindow::readDB()</tt> and +<tt>MainWindow::saveDB()</tt> functions can be found in the <tt>io.cpp</tt> file. +<p> <h2> Designing a Modern User Interface +</h2> +<a name="3"></a><p> Since we used the <em>Qt Designer</em> to design the <em>Main Window</em> +widget, we can extend the interface easily. We can use some of the +more advanced features of <a href="qmainwindow.html">QMainWindow</a>, which includes dockable +toolbars. Adding these is simple with the <em>Qt Designer</em>. The +final version of our project includes a toolbar, which provides quick +access to the <em>Open</em>, <em>Save</em>, <em>Print</em>, <em>New Page</em> and <em>Delete to Trash</em> actions. +<p> The possibilities are endless. An <em>Edit</em> menu, with the common <em>Cut</em>, <em>Copy</em> and <em>Paste</em> actions, could be added in a relatively +short period of time. As our project expands to other platforms, we +could add menus and dialogs that allow us synchronize todo lists +between a normal desktop computer and a handheld device running with +Qt/Embedded. +<p> [ <a href="motif-walkthrough-9.html">Previous: Replacing the Print Dialog</a> ] +[ <a href="motif-walkthrough.html">Home</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> |