QQ 静态截图完善实现之改造 CRectTracker 类
2007-03-17 21:58:32 来源:WEB开发网核心提示: // get messages until capture lost or cancelled/acceptedfor (;;){MSG msg;VERIFY(::GetMessage(&msg, NULL, 0, 0));if (CWnd::GetCapture() != pWnd)br
// get messages until capture lost or cancelled/accepted
for (;;)
{
MSG msg;
VERIFY(::GetMessage(&msg, NULL, 0, 0));
if (CWnd::GetCapture() != pWnd)
break;
//增加的,把消息派送给窗口
DispatchMessage(&msg);
switch (msg.message)
{
// handle movement/accept messages
case WM_LBUTTONUP:
case WM_MOUSEMOVE:
rectOld = m_rect;
// handle resize cases (and part of move)
if (px != NULL)
*px = (int)(short)LOWORD(msg.lParam) - xDiff;
if (py != NULL)
*py = (int)(short)HIWORD(msg.lParam) - yDiff;
// handle move case
if (nHandle == hitMiddle)
{
m_rect.right = m_rect.left + nWidth;
m_rect.bottom = m_rect.top + nHeight;
}
// allow caller to adjust the rectangle if necessary
AdjustRect(nHandle, &m_rect);
// only redraw and callback if the rect actually changed!
m_bFinalErase = (msg.message == WM_LBUTTONUP);
if (!rectOld.EqualRect(&m_rect) || m_bFinalErase)
{
if (bMoved)
{
m_bErase = TRUE;
DrawTrackerRect(&rectOld, pWndClipTo, pDrawDC, pWnd);
}
OnChangedRect(rectOld);
if (msg.message != WM_LBUTTONUP)
{
bMoved = TRUE;
}
}
if (m_bFinalErase)
goto ExitLoop;
if (!rectOld.EqualRect(&m_rect))
{
m_bErase = FALSE;
DrawTrackerRect(&m_rect, pWndClipTo, pDrawDC, pWnd);
}
break;
// handle cancel messages
case WM_KEYDOWN:
if (msg.wParam != VK_ESCAPE)
break;
case WM_RBUTTONDOWN:
if (bMoved)
{
m_bErase = m_bFinalErase = TRUE;
//DrawTrackerRect(&m_rect, pWndClipTo, pDrawDC, pWnd);
}
m_rect = rectSave;
goto ExitLoop;
// just dispatch rest of the messages
default:
DispatchMessage(&msg);
break;
}
}
我们只要在GetMessage(&msg, NULL, 0, 0)之后调用DispatchMessage(&msg),就可以把消息传递到主窗口,这样,内部处理和主窗口消息两不误,进而为程序为CRectTrakcer不能响应WM_LBUTTONUP和其消息而不用大改程序了...三、CRectTracker类的简要说明和改造类CMyTracker, CMyTracker类中增加了更改矩形颜色方法,增加StyleFlags的resizeMiddle设置中
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