duilib中设置不激活窗口后移动无法立即跟随的bug

LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_LBUTTONDOWN:
{
OnMouseLButtonDown(wParam, lParam);
break;
}
case WM_LBUTTONUP:
{
OnMouseLButtonUp(wParam, lParam);
break;
}
case WM_MOUSEMOVE:
{
OnMouseLDownMove(wParam, lParam);
break;
}
case WM_NCMOUSEMOVE:
{
OnMouseNcLDownMove(wParam, lParam);
break;
}
case WM_NCLBUTTONUP:
{
OnMouseNcLButtonUp(wParam, lParam);
break;
}
case WM_NCLBUTTONDOWN:
{
OnMouseNcLButtonDown(wParam, lParam);
break;
}

}
return __super::HandleMessage(uMsg, wParam, lParam);
}

void OnMouseNcLButtonDown(WPARAM wParam, LPARAM lParam)
{
POINT point;
point.x = (short)LOWORD( lParam);
point.y = (short)HIWORD( lParam);
ClientToScreen(m_hWnd, &point);
m_ptPrev = point;
}
void OnMouseNcLButtonUp(WPARAM wParam, LPARAM lParam)
{
POINT ptIn;
ptIn.x = (short)LOWORD( lParam);
ptIn.y = (short)HIWORD( lParam);
POINT pt = ptIn;
ClientToScreen(m_hWnd, &pt);
RECT rectWnd, rcWorkArea;
SIZE sz;
GetWindowRect(m_hWnd, &rectWnd);
OffsetRect(&rectWnd, m_ptPrev.x - m_ptMouseDown.x, m_ptPrev.y - m_ptMouseDown.y);
OffsetRect(&rectWnd, pt.x - m_ptPrev.x, pt.y - m_ptPrev.y);
::SystemParametersInfo(SPI_GETWORKAREA, 0, &rcWorkArea, FALSE);
sz.cx = rectWnd.right - rectWnd.left;
sz.cy = rectWnd.bottom - rectWnd.top;
if (rectWnd.left  + sz.cx > rcWorkArea.right)
{
rectWnd.left = rcWorkArea.right - sz.cx;
}
else if(rectWnd.left < 0)
{
rectWnd.left = 0;
}
if(rectWnd.top < 0)
{
rectWnd.top = 0;
}
else if(rectWnd.top + sz.cy > rcWorkArea.bottom )
{
rectWnd.top = rcWorkArea.bottom - sz.cy;
}
m_ptPrev.x = m_ptPrev.y = m_ptMouseDown.x = m_ptMouseDown.y = -1;
GetWindowRect(m_hWnd, &rectWnd);
}
void OnMouseLButtonDown(WPARAM wParam, LPARAM lParam)
{
m_bMouseState = LNCDOWN;
// 按下标题栏时拖放
::SendMessage(m_hWnd, WM_NCLBUTTONDOWN, wParam, lParam);
}
void OnMouseLButtonUp(WPARAM wParam, LPARAM lParam)
{
POINT ptIn, pt;
pt.x = ptIn.x = (short)LOWORD(lParam);
pt.y = ptIn.y = (short)HIWORD(lParam);
HRGN hRgn =	CreateRectRgn(0, 0, 0, 0);
GetWindowRgn(m_hWnd, hRgn);
ClientToScreen(m_hWnd, &pt);
if (!PtInRegion(hRgn, ptIn.x, ptIn.y) && (m_bMouseState == NOEVENT)) //释放鼠标捕捉
{
::SendMessage(m_hWnd, WM_MOUSELEAVE, 0, 0);
}
DeleteObject(hRgn);
if ((m_bMouseState == LNCDOWN) || (m_bMouseState == NOEVENT))
{
::SendMessage(m_hWnd, WM_NCMOUSEMOVE, wParam, lParam);
}
}
void OnMouseLDownMove(WPARAM wParam, LPARAM lParam)
{
POINT ptIn, pt;
pt.x = ptIn.x = (short)LOWORD(lParam);
pt.y = ptIn.y = (short)HIWORD(lParam);
HRGN hRgn =	CreateRectRgn(0, 0, 0, 0);
GetWindowRgn(m_hWnd, hRgn);
ClientToScreen(m_hWnd, &pt);
if (!PtInRegion(hRgn, ptIn.x, ptIn.y) && (m_bMouseState == NOEVENT)) //释放鼠标捕捉
{
::SendMessage(m_hWnd, WM_MOUSELEAVE, 0, 0);
}
DeleteObject(hRgn);
if ((m_bMouseState == LNCDOWN) || (m_bMouseState == NOEVENT))
{
::SendMessage(m_hWnd, WM_NCMOUSEMOVE, wParam, lParam);
}

}
void OnMouseNcLDownMove(WPARAM wParam, LPARAM lParam)
{
UINT nFlags = (UINT)wParam;
POINT point;
point.x = (short)LOWORD( lParam);
point.y = (short)HIWORD( lParam);
if (nFlags & MK_LBUTTON)
{
RECT rectWnd;
POINT pt = point;
GetWindowRect(m_hWnd, &rectWnd);
ClientToScreen(m_hWnd, &pt);
OffsetRect(&rectWnd, pt.x - m_ptPrev.x , pt.y - m_ptPrev.y);
m_ptPrev = pt;
int nWidth = rectWnd.right - rectWnd.left;
int nHeight = rectWnd.bottom - rectWnd.top;
RECT rcWorkArea;
::SystemParametersInfo(SPI_GETWORKAREA, 0, &rcWorkArea, FALSE);
if(rectWnd.left < rcWorkArea.left)
{
rectWnd.left = rcWorkArea.left;
}
else if (rectWnd.left  + nWidth > rcWorkArea.right)
{
rectWnd.left = rcWorkArea.right - nWidth;
}
if (rectWnd.top < rcWorkArea.top)
{
rectWnd.top = rcWorkArea.top;
}
else if (rectWnd.top + nHeight > rcWorkArea.bottom)
{
rectWnd.top = rcWorkArea.bottom - nHeight;
}
::MoveWindow(m_hWnd, rectWnd.left, rectWnd.top, nWidth, nHeight, TRUE);
}

}

private:enum MOUSESTATE{NOEVENT, LNCDOWN, LCLIENTDOWN, LSIZEDOWN};MOUSESTATE m_bMouseState; //记录鼠标状态POINT m_ptMouseDown; //记录鼠标按下时的位置POINT m_ptPrev; //记录鼠标前一次的位置