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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>Preparing to Migrate the User Interface</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-1.html">Previous: Getting Started</a> ]
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| 37 | [ <a href="motif-walkthrough.html">Home</a> ]
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| 38 | [ <a href="motif-walkthrough-3.html">Next: Using Qt Standard Dialogs</a> ]
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| 39 | <p> We are ready to start migrating the user interface for our project.
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| 40 | As mentioned in the introduction, we do this in steps, ensuring that
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| 41 | our application is still usable at every step of the migration process.
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| 42 | <p> The user interface can be viewed as a hierarchy; each top-level window
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| 43 | and dialog depends upon a parent (which is another top-level window or
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| 44 | dialog). When using <a href="motif-extension.html#Motif">Motif</a> <tt>XmMainWindow</tt> widgets, these should be
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| 45 | viewed as two separate entities: the <em>Main Window</em> widget with the
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| 46 | popup-menu hierarchy and the <em>View</em> widget contained in the <em>Main Window</em> widget. The <em>View</em> widget depends on the <em>Main Window</em>
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| 47 | widget.
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| 48 | <p> We begin migrating the pieces that have no dependencies, and work our
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| 49 | way up the dependency tree until all the pieces have been migrated.
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| 50 | <p> The hierarchy for this project looks something like this:
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| 51 | <p> <center><img src="motif-todo.png" alt="Motif Todo Hierarchy"></center>
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| 52 | <p> We will begin by migrating and replacing all of the dialogs, then the
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| 53 | <em>Main Window</em> widget with popup-menu hierarchy, and finally the <em>View</em> widget.
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| 54 | <p> However, we are not ready to begin just yet. The migration process can
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| 55 | be long, but it does not have to be difficult. The <em>Open</em>, <em>Save As</em>, <em>Page Delete</em> and <em>IO Error</em> dialogs use Motif <tt>XmFileSelectionBox</tt> and <tt>XmMessageBox</tt> dialogs. Qt provides similar
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| 56 | functionality with <a href="qfiledialog.html">QFileDialog</a> and <a href="qmessagebox.html">QMessageBox</a>, which we can begin
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| 57 | using immediately.
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| 58 | <p> The <em>Print</em> dialog is special, however. The <em>Print</em> dialog cannot be
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| 59 | replaced until after we have replaced the <em>View</em> widget. Qt provides
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| 60 | a complete printing mechanism with <a href="qprinter.html">QPrinter</a>, but we cannot start using
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| 61 | it until we have replaced the <em>View</em> widget.
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| 62 | <p> <h2> Removing the <em>Help</em> Dialog
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| 63 | </h2>
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| 64 | <a name="1"></a><p> The <em>Help</em> dialog is also special. Instead of replacing the <em>Help</em>
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| 65 | dialog with a custom <a href="qdialog.html">QDialog</a>, we will use the <a href="helpsystem.html">Qt
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| 66 | Help System</a> classes to provide a more advanced online help.
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| 67 | However, we cannot start using classes like <a href="qtooltip.html">QToolTip</a> and <a href="qwhatsthis.html">QWhatsThis</a>
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| 68 | until we replace the <em>Main Window</em> and <em>View</em> widgets.
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| 69 | <p> The help text included with the original project is very small and
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| 70 | only contains information about the <tt>XmNoteBook</tt> widget. The use of
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| 71 | tooltips and whats-this text will suffice for this example. If your
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| 72 | migration project has a large online <a href="helpsystem.html#help-system">help system</a>, we recommend looking
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| 73 | at the <a href="helpviewer-example.html">Simple HTML Help Browser</a>
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| 74 | example for information on how to build an rich text help system with
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| 75 | hypertext navigation and full printing capabilities, or using <a href="assistant.html">Qt Assistant</a>.
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| 76 | <p> Removing the existing <em>Help</em> dialog is relatively simple. We remove
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| 77 | the <tt>Xmd/Help.h</tt>, <tt>Xmd/HelpP.h</tt> and <tt>Xmd/Help.c</tt> files from our
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| 78 | project file and regenerate our <tt>Makefile</tt>.
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| 79 | <p> The code to create the <em>Help</em> menu and <em>Help</em> dialog is in <tt>todo.cpp</tt>. We remove the <tt>Xmd/Help.h</tt> include, the <tt>*help_manager</tt>
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| 80 | resource string, the <tt>help_cb()</tt> function forward declaration and the
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| 81 | <tt>help_widget</tt> global variable. We also need to remove the code that
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| 82 | creates the <em>Help</em> dialog. We will also remove the code to create
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| 83 | the <em>Help</em> menu, since this menu is now empty. Finally, we remove
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| 84 | the <tt>help_cb()</tt> function implementation.
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| 85 | <p> The <em>Help</em> dialog is now removed from our project. We cannot add
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| 86 | <a href="qtooltip.html">QToolTip</a> and <a href="qwhatsthis.html">QWhatsThis</a> help at the moment, since we are still using
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| 87 | <tt>XmMainWindow</tt> for the <em>Main Window</em> widget. Once we have
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| 88 | migrated the <em>Main Window</em> and the popup-menu hierarchy, we can
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| 89 | begin using QToolTip and QWhatsThis for online help.
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| 90 | <p> [ <a href="motif-walkthrough-1.html">Previous: Getting Started</a> ]
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| 91 | [ <a href="motif-walkthrough.html">Home</a> ]
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| 92 | [ <a href="motif-walkthrough-3.html">Next: Using Qt Standard Dialogs</a> ]
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| 93 | <p>
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| 95 | <p><address><hr><div align=center>
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| 97 | <td>Copyright © 2007
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| 99 | <td align=right><div align=right>Qt 3.3.8</div>
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