deferwndmove.cpp

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// deferWndMove.cpp: implementation of the CDeferWndMove class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "deferWndMove.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CDeferWndMove::CDeferWndMove(int nNumWindows) : m_hdwp(NULL)
{
	if (nNumWindows)
		BeginMove(nNumWindows);
}

CDeferWndMove::~CDeferWndMove()
{
	if (m_hdwp)
		EndMove();
}

BOOL CDeferWndMove::BeginMove(int nNumWindows)
{
	ASSERT (nNumWindows > 0);

	if (m_hdwp)
		EndMove();

	if (nNumWindows > 0)
		m_hdwp = ::BeginDeferWindowPos(nNumWindows);

	return (m_hdwp != NULL);
}

BOOL CDeferWndMove::EndMove()
{
	ASSERT (m_hdwp);

	BOOL bRes = ::EndDeferWindowPos(m_hdwp);
  m_hdwp = NULL;

  return bRes;
}

BOOL CDeferWndMove::MoveWindow(CWnd* pWnd, int x, int y, int nWidth, int nHeight, BOOL bRepaint)
{
	ASSERT (m_hdwp);

	if (!m_hdwp)
		return FALSE;

  ASSERT (pWnd->GetParent());

  // figure out what flags we need
	int nFlags = SWP_NOACTIVATE | SWP_NOZORDER;
  CRect rWnd;

  pWnd->GetWindowRect(rWnd);
  pWnd->GetParent()->ScreenToClient(rWnd);

  if (x == rWnd.left && y == rWnd.top)
    nFlags |= SWP_NOMOVE;

  if (nWidth == rWnd.Width() && nHeight == rWnd.Height())
    nFlags |= SWP_NOSIZE;

  BOOL bNeedMove = !((nFlags & SWP_NOMOVE) && (nFlags & SWP_NOSIZE));

  if (!bNeedMove)
    return TRUE;

  if (!bRepaint)
		nFlags |= SWP_NOREDRAW;

  HWND hWnd = pWnd->GetSafeHwnd();

	m_hdwp = ::DeferWindowPos(m_hdwp, hWnd, HWND_BOTTOM, x, y, nWidth, nHeight, nFlags);

  // fallback
	if (!m_hdwp)
  {
    ASSERT (0); // shouldn't fail but it might
    ::SetWindowPos(hWnd, HWND_BOTTOM, x, y, nWidth, nHeight, nFlags);
  }

	return TRUE;
}

BOOL CDeferWndMove::MoveWindow(CWnd* pWnd, LPCRECT lpRect, BOOL bRepaint)
{
	return MoveWindow(pWnd, lpRect->left, lpRect->top, 
							      lpRect->right - lpRect->left,
							      lpRect->bottom - lpRect->top, bRepaint);
}

CRect CDeferWndMove::OffsetCtrl(CWnd* pParent, UINT nCtrlID, int x, int y)
{
	CWnd* pCtrl = pParent->GetDlgItem(nCtrlID);

	if (pCtrl)
	{
		CRect rChild;
		pCtrl->GetWindowRect(rChild);
		pParent->ScreenToClient(rChild);

		if (x || y)
		{
			rChild.OffsetRect(x, y);
			MoveWindow(pCtrl, rChild); // our own version
		}

		return rChild;
	}

	return CRect(0, 0, 0, 0);
}

CRect CDeferWndMove::ResizeCtrl(CWnd* pParent, UINT nCtrlID, int cx, int cy)
{
	CWnd* pCtrl = pParent->GetDlgItem(nCtrlID);

	if (pCtrl)
	{
		CRect rChild, rParent;
		pCtrl->GetWindowRect(rChild);
		pParent->ScreenToClient(rChild);
		pParent->GetClientRect(rParent);

		if (cx || cy)
		{
			rChild.right += cx;
			rChild.bottom += cy;

			// make sure it also intersects with parent
			if (rChild.IntersectRect(rChild, rParent))
				MoveWindow(pCtrl, rChild); // our own version
		}

		return rChild;
	}

	return CRect(0, 0, 0, 0);
}