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MISC.C
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C/C++ Source or Header
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1997-05-06
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3KB
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104 lines
// 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 wChild, hChild, wParent, hParent;
int wScreen, hScreen, xNew, yNew;
HDC hdc;
// Get the Height and Width of the child window
GetWindowRect(hwndChild, &rcChild);
wChild = rcChild.right - rcChild.left;
hChild = rcChild.bottom - rcChild.top;
// Get the Height and Width of the parent window
GetWindowRect(hwndParent, &rcParent);
wParent = rcParent.right - rcParent.left;
hParent = rcParent.bottom - rcParent.top;
// Get the display limits
hdc = GetDC(hwndChild);
wScreen = GetDeviceCaps(hdc, HORZRES);
hScreen = GetDeviceCaps(hdc, VERTRES);
ReleaseDC(hwndChild, hdc);
// Calculate new X position, then adjust for screen
xNew = rcParent.left + ((wParent - wChild) /2);
if (xNew < 0)
{
xNew = 0;
}
else if ((xNew+wChild) > wScreen)
{
xNew = wScreen - wChild;
}
// Calculate new Y position, then adjust for screen
yNew = rcParent.top + ((hParent - hChild) /2);
if (yNew < 0)
{
yNew = 0;
}
else if ((yNew+hChild) > hScreen)
{
yNew = hScreen - hChild;
}
// Set it, and return
return SetWindowPos(
hwndChild,
NULL,
xNew, yNew,
0, 0,
SWP_NOSIZE | SWP_NOZORDER
);
}