MFC中的CRectTracker问题 [英] CRectTracker problem in MFC

问题描述

我已经在Scrollview中实现了CRectTracker.问题是跟踪器无需滚动即可正常工作.但是，当我滚动窗口时，跟踪器消失了.任何人都可以提出解决我问题的建议.

I had implemented a CRectTracker in Scrollview. The problem is the tracker works fine without scrolling. But when I scroll the window the tracker disappears. Could anyone give suggestions to solve my problem.

CFinalPDoc* pDoc = GetDocument();
tracker.m_nStyle = CRectTracker::dottedLine^CRectTracker::resizeOutside;		
//if not hitting any handle
  if(tracker.HitTest(point)<0)
  {
    //if mouse move and rectangle is not empty
    if(tracker.TrackRubberBand(this,point))
    {
      RedrawWindow();
      //make width and height positive and set trackerRect
      tracker.m_rect.NormalizeRect(); 
      trackerRect = &tracker.m_rect;
      //show resize handles
      tracker.GetHandleMask(); 
      //draw rectangle
      CClientDC dc(this);
      tracker.Draw(&dc);
    }
    else //no rubber band
    {
      //make width and height positive and set trackerRect
      tracker.m_rect.NormalizeRect();
      trackerRect = &tracker.m_rect;
			
      ((CStatic*)GetDlgItem(IDC_PICTURE))->SetBitmap(*currentBmp); 
    }
  }

推荐答案

可能是，
鼠标单击仅设置元素的标记标志...
...然后，在您的CXXXView::OnDraw(CDC*)中，您可以使用标志
将跟踪器绘制到标记的元素周围:)

Probably,
the mouse click sholud set the element''s marking flag only...
...then, in your CXXXView::OnDraw(CDC*), you could use the flag
to draw the tracker arount the marked element(s) :)

/*afx_msg*/ void CYourView::OnMouseDown(UINT uiFlags, CPoint point)
{
  CPoint cptAbsoluteViewPosition(point + GetScrollPosition());
  CYourDoc* pcDoc(GetDocument);
  if (pcDoc) {
    CYourDocElementBase* pcElement(pcDoc->FindElementByPos(cptAbsoluteViewPosition));
    if (pcElement) {
      pcElement->SetMarked(true);
      Invalidate();
    }
  }
  CScrollView::OnMouseDown(uiFlags, point);
}

/*virtual*/ void CYourView::OnDraw(CDC* pDC)
{
  //..
  POSITION pos(pcDoc->GetFirstElementPos());
  while (pos) {
    CYourDocElementBase* pcElement(pcDoc->GetNextElement(pos));
    if (pcElement) {
      CRect crElement(pcElement->GetElemRect());
      if (/*IsElemRectClipped(pDC, crElement)*/) {
        pcElement->Draw(pDC);
        if (pcElement->IsMarked()) {
          // use the crElement to draw the tracker there :)
        }
      }
    }
  }
  //..

}

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