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- // THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
- // ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
- // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
- // PARTICULAR PURPOSE.
- //
- // Copyright (C) 1993 - 1995 Microsoft Corporation. All Rights Reserved.
- //
- // MODULE: misc.c
- //
- // PURPOSE: Contains all helper functions "global" to the application.
- //
- // FUNCTIONS:
- // CenterWindow - Center one window over another.
- //
- // COMMENTS:
- //
- //
-
- #include <windows.h> // required for all Windows applications
- #include <windowsx.h>
-
- #ifdef WIN16
- #include "win16ext.h" // required only for win16 applications
- #endif
- #include "globals.h" // prototypes specific to this application
-
-
-
- //
- // FUNCTION: CenterWindow(HWND, HWND)
- //
- // PURPOSE: Center one window over another.
- //
- // PARAMETERS:
- // hwndChild - The handle of the window to be centered.
- // hwndParent- The handle of the window to center on.
- //
- // RETURN VALUE:
- //
- // TRUE - Success
- // FALSE - Failure
- //
- // COMMENTS:
- //
- // Dialog boxes take on the screen position that they were designed
- // at, which is not always appropriate. Centering the dialog over a
- // particular window usually results in a better position.
- //
-
- BOOL CenterWindow(HWND hwndChild, HWND hwndParent)
- {
- RECT rcChild, rcParent;
- int cxChild, cyChild, cxParent, cyParent;
- int cxScreen, cyScreen, xNew, yNew;
- HDC hdc;
-
- // Get the Height and Width of the child window
- GetWindowRect(hwndChild, &rcChild);
- cxChild = rcChild.right - rcChild.left;
- cyChild = rcChild.bottom - rcChild.top;
-
- // Get the Height and Width of the parent window
- GetWindowRect(hwndParent, &rcParent);
- cxParent = rcParent.right - rcParent.left;
- cyParent = rcParent.bottom - rcParent.top;
-
- // Get the display limits
- hdc = GetDC(hwndChild);
- cxScreen = GetDeviceCaps(hdc, HORZRES);
- cyScreen = GetDeviceCaps(hdc, VERTRES);
- ReleaseDC(hwndChild, hdc);
-
- // 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;
- }
-
- // Set it, and return
- return SetWindowPos(hwndChild,
- NULL,
- xNew, yNew,
- 0, 0,
- SWP_NOSIZE | SWP_NOZORDER);
- }
-