A fast and lightweight cell control

/*----------------------------------------------------------------------
Copyright (c)  Gipsysoft. All Rights Reserved.
Please see the file "licence.txt" for licencing details.
File:	MoveDialog.cpp
Owner:	russf@gipsysoft.com
Purpose:

	Move the dialog to a specific point, ensuring it stays on screen.

	Not tested on multiple monitors but in theory it *should* work.

----------------------------------------------------------------------*/
#include "stdafx.h"

#pragma warning( disable: 4706 )
#define COMPILE_MULTIMON_STUBS
#include <multimon.h>

static void GetDisplayWorkArea( POINT pt, RECT &rc )
{
	HMONITOR hMon = MonitorFromPoint( pt, MONITOR_DEFAULTTONEAREST );
	if( hMon )
	{
		MONITORINFO m = { sizeof( m ) };
		if( GetMonitorInfo( hMon, &m ) )
		{
			rc = m.rcWork;
		}
	}
}


void MoveDialog( HWND hwnd, POINT pt )
{
	RECT rcWindow;
	GetWindowRect( hwnd, &rcWindow );

	const int nWidth = rcWindow.right - rcWindow.left;
	const int nHeight = rcWindow.bottom - rcWindow.top;
	
	RECT rcDisplay;
	GetDisplayWorkArea( pt, rcDisplay );

	if( pt.x < rcDisplay.left )
	{
		pt.x = rcDisplay.left;
	}

	if( pt.y < rcDisplay.top )
	{
		pt.y = rcDisplay.top;
	}

	RECT rcWindowNew;
	rcWindowNew.left = pt.x;
	rcWindowNew.top = pt.y;
	rcWindowNew.right = pt.x + nWidth;
	rcWindowNew.bottom = pt.y + nHeight;


	int nDeltaX = 0, nDeltaY = 0;
	if( rcWindowNew.right > rcDisplay.right )
	{
		nDeltaX = rcDisplay.right - rcWindowNew.right;
	}


	if( rcWindowNew.bottom > rcDisplay.bottom )
	{
		nDeltaY = rcDisplay.bottom - rcWindowNew.bottom;
	}


	if( nDeltaY || nDeltaX )
	{
		OffsetRect( &rcWindowNew, nDeltaX, nDeltaY );
	}
	SetWindowPos( hwnd, NULL, rcWindowNew.left, rcWindowNew.top, nWidth, nHeight, SWP_NOZORDER );
}