Function CenterWindow

src/drivers/win/gui.cpp:13–40

* Centers a window relative to its parent window. * * @param hwndDlg Handle of the window to center. **/

* @param hwndDlg Handle of the window to center.
**/
void CenterWindow(HWND hwndDlg)
{
	//TODO: This function should probably moved into the generic Win32 window file
	//move the window relative to its parent
	HWND hwndParent = GetParent(hwndDlg);
	RECT rect;
	RECT rectP;

	GetWindowRect(hwndDlg, &rect);
	GetWindowRect(hwndParent, &rectP);

	int width  = rect.right  - rect.left;
	int height = rect.bottom - rect.top;

	int x = ((rectP.right-rectP.left) -  width) / 2 + rectP.left;
	int y = ((rectP.bottom-rectP.top) - height) / 2 + rectP.top;

	int screenwidth  = GetSystemMetrics(SM_CXSCREEN);
	int screenheight = GetSystemMetrics(SM_CYSCREEN);

	//make sure that the dialog box never moves outside of the screen
	if(x < 0) x = 0;
	if(y < 0) y = 0;
	if(x + width  > screenwidth)  x = screenwidth  - width;
	if(y + height > screenheight) y = screenheight - height;

	MoveWindow(hwndDlg, x, y, width, height, FALSE);
}

/**
* Centers a window on the screen.