Layered Modal Window
in [MFC]
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From: Matt Houser on 9 Feb 2010 14:40 I've created modeless layered windows successfully before, now I am trying to create a modal layered window. I am deriving from CWnd and duplicating much of CDialog::DoModal() to accomplish this. It seems to be working, except that pressing Alt+F4 destroys my window, but does not exit from RunModalLoop(). How do I resolve this? Is there a style that's missing from my window? Or is there an easier way to accomplish what I am trying to do? Thanks Matt Houser http://www.insidercoding.com
From: AliR on 10 Feb 2010 11:14 I don't understand what you are doing. Why are you duplicating code from DoModal? You know that you can have a layered modal dialog box, but simply inheriting from a CDialog, and in the OnInitDialog call SetWindowLong to add the layered style to it, and the call SetLayeredWindowAttributes BOOL CMyDialog::OnInitDialog() { CDialog::OnInitDialog(); SetWindowLong(m_hWnd,GWL_EXSTYLE,GetWindowLong(m_hWnd, GWL_EXSTYLE) | WS_EX_LAYERED); SetLayeredWindowAttributes(0,255,LWA_ALPHA); return TRUE; } No need to write your own modal loop. But if you insist on writing your own modal loop then when the dialog feels like it is time to close the application you will need to send a WM_QUIT message to your loop. AliR. "Matt Houser" <matt(a)houser.ca> wrote in message news:040EDF48-F1EB-4013-9A9F-027B6CF1F99A(a)microsoft.com... > I've created modeless layered windows successfully before, now I am trying > to create a modal layered window. I am deriving from CWnd and duplicating > much of CDialog::DoModal() to accomplish this. > > It seems to be working, except that pressing Alt+F4 destroys my window, > but does not exit from RunModalLoop(). > > How do I resolve this? Is there a style that's missing from my window? > Or is there an easier way to accomplish what I am trying to do? > > Thanks > Matt Houser > http://www.insidercoding.com
From: Matt Houser on 10 Feb 2010 12:27 I am unable to use SetLayeredWindowAttributes because I need per-pixel alpha blending for the window. However, I did get it working using CDialog as you suggested. This saves me rewriting DoModal(). However, a minor issue: When I was using CWnd, I was able to override PreCreateWindow() so that I can call AfxRegisterWndClass() to use a window class that has no default cursor set (I set it during WM_MOUSEMOVE events). This does not get called for CDialog. Is there a way to remove the default cursor for dialogs (my cursor is currently flashing as the mouse is moved). Thanks, ....Matt
From: Joseph M. Newcomer on 10 Feb 2010 16:28 I suspect that Alt+F4 sends a WM_CLOSE to the active window, so if you do an OnClose handler that does nothing, this will override it. You will probably have to intercept the System Menu SC_CLOSE notification to handle the [x] button in the caption bar, and SendMessage/PostMessage a user-defined message that will call EndDialog. joe On Tue, 9 Feb 2010 14:40:06 -0500, "Matt Houser" <matt(a)houser.ca> wrote: >I've created modeless layered windows successfully before, now I am trying >to create a modal layered window. I am deriving from CWnd and duplicating >much of CDialog::DoModal() to accomplish this. > >It seems to be working, except that pressing Alt+F4 destroys my window, but >does not exit from RunModalLoop(). > >How do I resolve this? Is there a style that's missing from my window? >Or is there an easier way to accomplish what I am trying to do? > >Thanks >Matt Houser >http://www.insidercoding.com Joseph M. Newcomer [MVP] email: newcomer(a)flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
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