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Fullscreen toggling and taskbar

Started by Black Knight Sep 20, 2009 at 12:23 AM 2 replies 1.6k views

Original Post

Sep 20, 2009 at 12:23 AM

I have some code that switches between fullscreen and windowed mode.It basically changes the window style.Here is the code that makes the window go fullscreen:


//NOte: ChangeDisplaySettings is called before this point with a supported setting.
//change to fullscreen style
			SetWindowLongPtr(m_hWnd,GWL_EXSTYLE,WS_EX_APPWINDOW);
			SetWindowLongPtr(m_hWnd,GWL_STYLE,WS_POPUP);
			
			//SetWindowPos needs to be called after SetWindowLongPtr to make sure changes are applied
			SetWindowPos(m_hWnd,HWND_TOP,0,0,0,0,SWP_FRAMECHANGED|SWP_NOMOVE|SWP_NOSIZE);
			
			//maximize the window
			ShowWindow(m_hWnd,SW_MAXIMIZE);
			SetFocus(m_hWnd);

And this code is for going back to windowed mode :


//need to call SW_RESTORE twice for some weird reason
			ShowWindow(m_hWnd,SW_RESTORE);
			
			//go back to normal resolution
			ChangeDisplaySettings(NULL,0);
						
			//change back to overlapped window style
			SetWindowLongPtr(m_hWnd,GWL_EXSTYLE,WS_EX_APPWINDOW | WS_EX_WINDOWEDGE);
			SetWindowLongPtr(m_hWnd,GWL_STYLE,WS_OVERLAPPEDWINDOW);
			
			//SetWindowPos needs to be called after SetWindowLongPtr to make sure changes are applied
			SetWindowPos(m_hWnd,HWND_TOP,0,0,0,0,SWP_FRAMECHANGED|SWP_NOMOVE|SWP_NOSIZE);
			ShowWindow(m_hWnd,SW_RESTORE);
			SetFocus(m_hWnd);

			//for some weird(2) reason after coming back from fullscreen mode the icon on the title bar disappears
			// so i set it again here
			HICON icon = (HICON)GetClassLongPtr(m_hWnd,GCL_HICON);					
			SendMessage(m_hWnd,WM_SETICON,ICON_BIG,(LPARAM)icon);
			SendMessage(m_hWnd,WM_SETICON,ICON_SMALL,(LPARAM)icon);

Everything works except for a minor detail.After i come back to windowed mode my applications button at the taskbar looks like it does not have focus.But the application has focus and takes input mouse presses etc.When I alt-tab or click from the taskbar then the taskbar updates itself and it shows my app as focused. Any idea what might be wrong?

Black Knight

Sep 21, 2009 at 8:14 AM

This is the app I'm having this issue with.It requires OpenGL3.2 support.Pressing F1 toggles between fullscreen and windowed mode.

Link

Erik Rufelt

Sep 21, 2009 at 8:46 AM

Try adding SWP_DRAWFRAME to your SetWindowPos flags.

Though it doesn't seem to make a difference when I test it now..
This is how I do it:

if(g_fullscreen) {	g_fullscreen = false;	SetWindowLongPtr(hWnd, GWL_style, WS_OVERLAPPEDWINDOW | WS_VISIBLE);	SetWindowPos(hWnd,HWND_NOTOPMOST,g_wrect.left,g_wrect.top,g_wrect.right-g_wrect.left,g_wrect.bottom-g_wrect.top,SWP_DRAWFRAME|SWP_FRAMECHANGED);}else {	g_fullscreen = true;	GetWindowRect(hWnd, &g_wrect);	SetWindowLongPtr(hWnd, GWL_style, WS_POPUP | WS_SYSMENU | WS_VISIBLE);	SetWindowPos(hWnd,HWND_TOPMOST,0,0,0,0,SWP_NOSIZE|SWP_NOMOVE|SWP_DRAWFRAME|SWP_FRAMECHANGED);	ShowWindow(hWnd,SW_MAXIMIZE);}

Black Knight

Sep 21, 2009 at 8:53 AM

I will try it out when I'm back at home maybe it makes a difference.Thanks for the tip.

This might be useful too :

http://msdn.microsoft.com/en-us/library/dd145221(VS.85).aspx

But I guess it should be handled automatically.

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