Introduction
The usual method of creating a full screen window in Windows CE involves using the function SHFullScreen
. This article describes a method of creating full screen windows with standard window management calls.
The Variables
HWND hWnd;
HWND hWndInputPanel = NULL; HWND hWndTaskBar = NULL; HWND hWndSipButton = NULL;
BOOL mode = false;
Finding the Window Information
The first step is to find the handles of the three main windows that handle the TaskBar, Standard Input Panel (SIP) and SIP Button Bar. This should be done early on in the application during initialization.
void InitFullScreen (void)
{
hWndInputPanel = FindWindow(TEXT("SipWndClass"), NULL);
hWndSipButton = FindWindow(TEXT("MS_SIPBUTTON"), NULL);
hWndTaskBar = FindWindow(TEXT("HHTaskBar"), NULL);
}
Toggling Between The Two Modes
Toggling between the two modes is a simple matter of setting the windows states, and sizing our window appropriately.
To Enter Fullscreen mode we use ShowWindow(HWND,SW_HIDE)
on each of the system windows.
To Exit Fullscreen mode we use ShowWindow(HWND,SW_SHOW)
on each of the system windows. This will however also show the input panel, which is not desirable, so hWndInputPanel
should be ignored.
Sizing the window to the correct size involves a different system call depending on whether you are entering or exiting Fullscreen Mode.
Entering Fullscreen mode we call SetWindowPos(hWnd...
using the results from a GetSystemMetrics
call.
Exiting Fullscreen mode we call SetWindowPos(hWnd...
using the results from a SystemParametersInfo(...
call.
void ToggleFullScreen()
{
RECT rtDesktop;
if (mode)
{
if(hWndTaskBar != NULL)
ShowWindow(hWndTaskBar, SW_SHOW);
ShowWindow(hWndInputPanel, SW_SHOW);
if(hWndSipButton != NULL)
ShowWindow(hWndSipButton, SW_SHOW);
if(SystemParametersInfo(SPI_GETWORKAREA, 0, &rtDesktop, NULL) == 1)
SetWindowPos(hWnd,HWND_TOPMOST,0,0,rtDesktop.right -
rtDesktop.left,rtDesktop.bottom - rtDesktop.top, SWP_SHOWWINDOW);
mode = false;
}
else
{
if (hWndTaskBar != NULL) ShowWindow(hWndTaskBar, SW_HIDE);
if (hWndInputPanel != NULL) ShowWindow(hWndInputPanel, SW_HIDE);
if (hWndSipButton != NULL) ShowWindow(hWndSipButton, SW_HIDE);
SetWindowPos(hWnd,HWND_TOPMOST,0,0,GetSystemMetrics(SM_CXSCREEN),
GetSystemMetrics(SM_CYSCREEN), SWP_SHOWWINDOW);
mode = true;
}
}
Points of Interest
Changing to a fullscreen window is surprisingly simple. There are functions in .NET and MFC which do the same thing, however for extra performance, nothing beats standard Win32 functions!