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<TITLE>Dialogs - Costumizing CFileDialog</TITLE>
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<CENTER><H3><FONT COLOR="#AOAO99">
Costumizing CFileDialog
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<CENTER><H3><HR></H3></CENTER>
<p>This article was contributed by <a href="mailto:csa@mail.jubii.dk">Christian Skovdal
Andersen</a>. </p>
<p><font face="Arial"><em><strong>The Demo</strong></em><br>
</font>The following code will make the file-open dialog 150 pixels higher, than it use to
be. This is a very simple example of the things that can be done, to make the common
dialogs smarter and more useable.</p>
<p><img src="cmdlg.gif" width="426" height="442" alt="cmdlg.gif (10566 bytes)"></p>
<p><em><font face="Arial"><strong>What To Consider</strong></font></em><br>
Eventhough it has become easier to costumize the common dialogs with MFC, there still is
some tricky parts.
<ul>
<li>If you want to change the size or appearence of some of the controls in the dialog (or
the dialog it self, for that matter) you cannot just use "GetDlgItem()",
because the controls belongs to the parent of the dialog you have subclassed.</li>
<li>The id's of the controls is defined in the header file <em><dlgs.h> </em>as
<br>
<br>
<em> stc3, stc2
</em>The two label controls ("File name" and "Files of type")<br>
<em>edt1, cmb1
</em>The edit control and the drop-down box.<br>
<em> IDOK, IDCANCEL </em>The OK and Cancel
button.<br>
<em> lst1
</em>The window that is used to browse the namespace.<br>
If you using a dialog with "Help"
button and "Open as read-only" check button, <br>
there will also be ids for these controls. They
are all defined in <em><dlgs.h>.</em></li>
</ul>
<p><font face="Arial"><strong><em>The sample code</em></strong></font><br>
The class CMyFileDialog is derived from CFileDialog using classwizard. A handler for
WM_INITDIALOG has been added and that is where everything is done.</p>
<pre>////////////////////////////////////////////////////////////////
// This is where the real action is going on
// Remember #include <dlgs.h>
<font
color="#800000">BOOL CMyFileDialog::OnInitDialog() // Override
{
</font><font
color="#000000"> // This variable should be changed acording to your wishes
// about the size of the finished dialog
</font><font
color="#800000"> const UINT iExtraSize = 150;
</font><font color="#000000"> // Number of controls in the File Dialog</font><font
color="#800000">
const UINT nControls = 7;
</font><font color="#000000"> // Get a pointer to the original dialog box.</font><font
color="#800000">
CWnd *wndDlg = GetParent();
RECT Rect;
wndDlg->GetWindowRect(&Rect);
</font><font
color="#000000"> // Change the size</font><font color="#800000">
wndDlg->SetWindowPos(NULL, 0, 0,
Rect.right - Rect.left,
Rect.bottom - Rect.top + iExtraSize,
SWP_NOMOVE);
</font><font
color="#000000"> // Control ID's - defined in <dlgs.h></font><font
color="#800000">
UINT Controls[nControls] = {stc3, stc2, </font><font color="#000000">// The two label controls</font><font
color="#800000">
edt1, cmb1, </font><font color="#000000">// The eidt control and the drop-down box</font><font
color="#800000">
IDOK, IDCANCEL,
lst1}; </font><font
color="#000000">// The Explorer window</font><font color="#800000">
</font><font
color="#000000"> // Go through each of the controls in the dialog box, and move them to a new position
</font><font
color="#800000"> for (int i=0 ; i<nControls ; i++)
{
CWnd *wndCtrl = wndDlg->GetDlgItem(Controls[i]);
wndCtrl->GetWindowRect(&Rect);
wndDlg->ScreenToClient(&Rect); </font><font
color="#000000">// Remember it is child controls
</font><font color="#800000">
</font><font
color="#000000"> // Move all the controls according to the new size of the dialog.
</font><font
color="#800000"> if (Controls[i] != lst1)
wndCtrl->SetWindowPos(NULL,
Rect.left, Rect.top + iExtraSize,
0, 0, SWP_NOSIZE);
else </font><font
color="#000000">// This is the explorer like window. It should be sized - not moved.</font><font
color="#800000">
wndCtrl->SetWindowPos(NULL, 0, 0,
Rect.right - Rect.left,
Rect.bottom - Rect.top + iExtraSize,
SWP_NOMOVE);
}
</font><font
color="#000000">// Remember to call the baseclass.</font><font color="#800000">
return CFileDialog::OnInitDialog();
}
</font></pre>
<p>Download the sample project/executable <a href="cmdlg.zip">cmdlg.zip</a> (31 kb)</p>
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<p>Last updated: 11 April 1998
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