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| 6 | <title>Using Custom QDialogs</title>
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| 31 | </td>
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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>Using Custom QDialogs</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-3.html">Previous: Using Qt Standard Dialogs</a> ]
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| 37 | [ <a href="motif-walkthrough.html">Home</a> ]
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| 38 | [ <a href="motif-walkthrough-5.html">Next: Using Existing Dialogs with QMotifDialog</a> ]
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| 39 | <p> After we have replaced the standard dialogs, we move onto the custom
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| 40 | dialogs. This project has a single custom dialog: the <em>Page Edit</em>
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| 41 | dialog.
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| 42 | <p> Instead of writing the code ourselves, we use <a href="designer-manual.html">Qt Designer</a> to design our dialog.
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| 43 | Designing a custom dialog is beyond the scope of
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| 44 | this document: see the <a href="designer-manual.html">Qt Designer Manual</a> if you're unfamiliar
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| 45 | with Qt's visual design tool.
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| 46 | <p> <h2> Replacing the <em>Page Edit</em> Dialog
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| 47 | </h2>
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| 48 | <a name="1"></a><p> The custom <a href="qdialog.html">QDialog</a> description for the <em>Page Edit</em> dialog is saved
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| 49 | as <tt>pageeditdialog.ui</tt>. We add this file to the project file by
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| 50 | adding the line
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| 51 | <pre>
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| 52 | FORMS = pageeditdialog.ui
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| 53 | </pre>
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| 54 |
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| 55 | to the <tt>.pro</tt> file, and regenerate the <tt>Makefile</tt>. The <em>uic</em>
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| 56 | utility generates the code for our custom QDialog, which is then
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| 57 | compiled and linked into our application. (<em>uic</em> is invoked
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| 58 | automatically from makefiles generated from <tt>.pro</tt> files.)
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| 59 | <p> We need to pass the top-level <a href="qmotifwidget.html">QMotifWidget</a> as the <em>client_data</em>
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| 60 | argument to the <tt>EditPage</tt> function, which we will use as the parent
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| 61 | for our new <tt>PageEditDialog</tt>. We do this the same way as we have
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| 62 | done for the <em>Open</em> and <em>Save As</em> dialogs in <tt>todo.cpp</tt>.
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| 63 | <p>
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| 64 |
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| 65 | <p> <pre></pre>
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| 66 | <p> The <tt>EditPage()</tt> function is implemented in <tt>actions.cpp</tt>. We start
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| 67 | by adding the includes needed for the <tt>PageEditDialog</tt> and <a href="qlineedit.html">QLineEdit</a>.
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| 68 | <p>
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| 69 |
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| 70 | <p> <pre></pre>
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| 71 | <p> In the <tt>EditPage()</tt> function, We create the <tt>PageEditDialog</tt>, set
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| 72 | the initial values of the three QLineEdit widgets with values from the
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| 73 | current page and execute the dialog.
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| 74 | <p> <pre></pre><pre>
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| 75 | ...
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| 76 | </pre>
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| 77 |
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| 78 | <p> At this point in the code, the page properties should be modified. The
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| 79 | code to do this is in the <tt>DoEditPage()</tt> function. We move the
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| 80 | contents of <tt>DoEditPage()</tt> to this point and remove the <tt>DoEditPage()</tt> function completely.
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| 81 | <p> The <tt>Page</tt> struct defined in <tt>page.h</tt> stores strings in <tt>char*</tt>
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| 82 | arrays. Since the PageEditDialog and the data it contains will be
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| 83 | destroyed when we return from this function, we need to convert the
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| 84 | unicode <a href="qstring.html">QString</a> data into a <a href="qcstring.html">QCString</a> in the local encoding and
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| 85 | duplicate it with <a href="qcstring.html#qstrdup">qstrdup</a>().
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| 86 | <p> <pre></pre>
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| 87 | <p> The same process must be done for the minorTab text:
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| 88 | <p> <pre></pre>
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| 89 | <p> ... and for the majorTab text:
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| 90 | <p> <pre></pre>
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| 91 | <p> [ <a href="motif-walkthrough-3.html">Previous: Using Qt Standard Dialogs</a> ]
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| 92 | [ <a href="motif-walkthrough.html">Home</a> ]
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| 93 | [ <a href="motif-walkthrough-5.html">Next: Using Existing Dialogs with QMotifDialog</a> ]
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| 94 | <p>
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| 98 | <td>Copyright © 2007
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| 100 | <td align=right><div align=right>Qt 3.3.8</div>
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