Modeless Dialog Iconic--but no icon!

Deepak Saxena -- Deepak_Saxena@ccm.ch.intel.com
Friday, June 21, 1996

[MSVC 4.1, WintNT351sp4]

How does one make a modeless dialog box display an icon when it is 
minimized.  I've tried calling SetWindow(), over riding 
PreCreateWindow()...which was useless since dialogs don't call 
precreatewindow!  I haven't tried handling WM_PAINT and manually 
blitting the icon, but I'd much rather not do that.  If I minimize the 
dlg, it just displays and empty grey square.  But if I drag the icon, it 
displays the app icon!  

Deepak 
I do not speak for Intel

---

Colin Angus Mackay -- colin.angus.mackay@dial.pipex.com
Monday, June 24, 1996

[Mini-digest: 2 responses]

> [MSVC 4.1, WintNT351sp4]

> How does one make a modeless dialog box display an icon when it is 
> minimized.  I've tried calling SetWindow(), over riding 
> PreCreateWindow()...which was useless since dialogs don't call 
> precreatewindow!  I haven't tried handling WM_PAINT and manually 
> blitting the icon, but I'd much rather not do that.  If I minimize the 
> dlg, it just displays and empty grey square.  But if I drag the icon, it 
> displays the app icon!  

Try the following, this code is generated by the AppWizard when creating a dialog based application:

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMyDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMyDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}


NOTES:

The icon "m_hIcon" is set up in the constructor with the line:
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

In the InitDialog function the following appears:
	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon


I hope this helps,
Colin.
-----From: David.Lowndes@bj.co.uk

Deepak,

Here's a couple of references that might help you:

KB article Q108936 "Using a Dialog Box as the Main Window of an Application"
Win32 Programmers Reference - "Custom Dialog Boxes"

If you do a search on MSDN for "DLGWINDOWEXTRA" or "DefDlgProc" you
should find plenty of articles giving information on how to do this.

Dave Lowndes

---

Bill Campbell -- bill_campbell@ppp.ablecom.net
Monday, June 24, 1996

[MSVC 4.1, WintNT351sp4]

How does one make a modeless dialog box display an icon when it is 
minimized.  I've tried calling SetWindow(), over riding 
PreCreateWindow()...which was useless since dialogs don't call 
precreatewindow!  I haven't tried handling WM_PAINT and manually 
blitting the icon, but I'd much rather not do that.  If I minimize the 
dlg, it just displays and empty grey square.  But if I drag the icon, it 
displays the app icon!  

Deepak 
I do not speak for Intel



This may Doit

	In OnEraseBackground() | OnPaint()

                   if (IsIconic())
		{
			APP.LoadIcon( youricon );
			CDC.DrawIcon( params );
		}

BIll  3rd Wave

---

rick cameron -- rick_cameron@msn.com
Monday, July 22, 1996

Did you try CWnd::SetIcon?

- rick

> [MSVC 4.1, WintNT351sp4]
> 
> How does one make a modeless dialog box display an icon when it is 
> minimized.  I've tried calling SetWindow(), over riding 
> PreCreateWindow()...which was useless since dialogs don't call 
> precreatewindow!  I haven't tried handling WM_PAINT and manually 
> blitting the icon, but I'd much rather not do that.  If I minimize the 
> dlg, it just displays and empty grey square.  But if I drag the icon, it 
> displays the app icon!  
> 
> Deepak 
> I do not speak for Intel
> 

---

| Вернуться в корень Архива |