WindowsXP-SP1/enduser/netmeeting/nmutil/centwnd.cpp
2020-09-30 16:53:49 +02:00

63 lines
1.7 KiB
C++

#include "precomp.h"
#include <oprahcom.h>
/* C E N T E R W I N D O W */
/*-------------------------------------------------------------------------
%%Function: CenterWindow
Center a window over another window.
-------------------------------------------------------------------------*/
VOID NMINTERNAL CenterWindow(HWND hwndChild, HWND hwndParent)
{
int xNew, yNew;
int cxChild, cyChild;
int cxParent, cyParent;
int cxScreen, cyScreen;
RECT rcChild, rcParent, rcScrn;
// Get the Height and Width of the child window
GetWindowRect(hwndChild, &rcChild);
cxChild = rcChild.right - rcChild.left;
cyChild = rcChild.bottom - rcChild.top;
// Get the display limits
GetWindowRect(GetDesktopWindow(), &rcScrn);
cxScreen = rcScrn.right - rcScrn.left;
cyScreen = rcScrn.bottom - rcScrn.top;
if(hwndParent != NULL )
{
// Get the Height and Width of the parent window
GetWindowRect(hwndParent, &rcParent);
cxParent = rcParent.right - rcParent.left;
cyParent = rcParent.bottom - rcParent.top;
}
else
{
// No parent - center on desktop
cxParent = cxScreen;
cyParent = cyScreen;
SetRect(&rcParent, 0, 0, cxScreen, cyScreen);
}
// Calculate new X position, then adjust for screen
xNew = rcParent.left + ((cxParent - cxChild) / 2);
if (xNew < 0)
xNew = 0;
else if ((xNew + cxChild) > cxScreen)
xNew = cxScreen - cxChild;
// Calculate new Y position, then adjust for screen
yNew = rcParent.top + ((cyParent - cyChild) / 2);
if (yNew < 0)
yNew = 0;
else if ((yNew + cyChild) > cyScreen)
yNew = cyScreen - cyChild;
SetWindowPos(hwndChild, NULL, xNew, yNew, 0, 0,
SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
}