113 lines
2.6 KiB
C++
113 lines
2.6 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1997.
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//
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// File: W I N D U T I L . C P P
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//
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// Contents: Window utilities -- For now, just CenterWindow
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//
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// Notes:
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//
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// Author: jeffspr 22 May 1998
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//
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//----------------------------------------------------------------------------
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#include "pch.h"
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#pragma hdrstop
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//+---------------------------------------------------------------------------
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//
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// Function: FCenterWindow
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//
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// Purpose: Center a child window on the parent
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//
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// Arguments:
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// hwndChild [in] Child window handle
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// hwndParent [in] Parent window handle (or NULL for desktop)
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//
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// Returns:
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//
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// Author: jeffspr 22 May 1998
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//
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// Notes:
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//
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BOOL FCenterWindow (HWND hwndChild, HWND hwndParent)
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{
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RECT rChild, rParent;
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int wChild, hChild, wParent, hParent;
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int wScreen, hScreen, xNew, yNew;
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HDC hdc = NULL;
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BOOL fReturn = TRUE;
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AssertSz(hwndChild, "Bad Child Window param to CenterWindow");
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// Get the Height and Width of the child window
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//
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GetWindowRect (hwndChild, &rChild);
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wChild = rChild.right - rChild.left;
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hChild = rChild.bottom - rChild.top;
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// Get the Height and Width of the parent window
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//
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if (NULL == hwndParent)
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{
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GetWindowRect (GetDesktopWindow(), &rParent);
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}
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else
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{
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GetWindowRect (hwndParent, &rParent);
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}
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wParent = rParent.right - rParent.left;
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hParent = rParent.bottom - rParent.top;
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// Get the display limits
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//
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hdc = GetDC (hwndChild);
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if (hdc)
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{
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wScreen = GetDeviceCaps (hdc, HORZRES);
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hScreen = GetDeviceCaps (hdc, VERTRES);
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ReleaseDC (hwndChild, hdc);
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// Calculate new X position, then adjust for screen
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//
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xNew = rParent.left + ((wParent - wChild) / 2);
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if (xNew < 0)
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{
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xNew = 0;
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}
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else if ((xNew + wChild) > wScreen)
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{
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xNew = wScreen - wChild;
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}
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// Calculate new Y position, then adjust for screen
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//
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yNew = rParent.top + ((hParent - hChild) / 2);
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if (yNew < 0)
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{
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yNew = 0;
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}
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else if ((yNew + hChild) > hScreen)
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{
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yNew = hScreen - hChild;
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}
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// Set it, and return
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//
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fReturn = SetWindowPos (hwndChild, NULL,
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xNew, yNew, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
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}
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else
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{
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fReturn = FALSE;
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}
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return fReturn;
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}
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