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【MFC】 ClientToScreen 和ScreenToClient 【转】
ClientToScreen( )是把窗口坐标转换为屏幕坐标
ScreenToClient( )是把屏幕坐标转换为窗口坐标
屏幕坐标是相对于屏幕左上角的,而窗口坐标是相对于窗口用户区左上角的
VC下,有些函数使用窗口坐标,有些使用屏幕坐标,使用时要分清。
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一个窗体分为两部分:系统区和客户区
象标题和菜单之类的是系统区,由系统来控制,客户区就是你的地盘喽!!!
Width, Height 是指整体的,ClientWidth, ClientHeight是指客户区的,两者相减就是
系统区的啦!!!
ClientToScreen是把坐标从当前窗体转化成全屏幕的!!!
ScreenToClient是把屏幕坐标转化成相对当前窗体的坐标!!!!
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bool m_bIsLButtonDawn =false;
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void CDrawDlg::OnMouseMove(UINT nFlags, CPoint point)
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{
// TODO: Add your message handler code here and/or call default
CWnd *pwnd=GetDlgItem(IDC_EDIT1);
CDC *pdc=pwnd->GetDC();
CRect rect;
this->ClientToScreen(&point);
pwnd->ScreenToClient(&point);
pwnd->GetClientRect(&rect);
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// HCURSOR hcur=::LoadCursorFromFile("pen.cur");
// SetClassLong(GetSafeHwnd(),GCL_HCURSOR,(LONG)hcur);
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// CPen pen(PS_INSIDEFRAME,-1,RGB(255,255,255));
// CPen* olePen=pdc->SelectObject(&pen);
if(rect.PtInRect(point) && m_bIsLButtonDawn )
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{
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pdc->DPtoLP(&m_fp);
pdc->MoveTo(m_fp);
pdc->DPtoLP(&point);
pdc->LineTo(point);
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}
m_fp=point;
// pdc->SelectObject(olePen);
ReleaseDC(pdc);
CDialog::OnMouseMove(nFlags, point);
}
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void CDrawDlg::OnLButtonUp(UINT nFlags, CPoint point)
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{
m_bIsLButtonDawn =false;
// TODO: Add your message handler code here and/or call default
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/**//**//**//*
CWnd *pwnd=GetDlgItem(IDC_EDIT1);
CDC *pdc=pwnd->GetDC();
CRect rect;
this->ClientToScreen(&point);
pwnd->ScreenToClient(&point);
pwnd->GetClientRect(&rect);
if(rect.PtInRect(point))
{
pdc->DPtoLP(&m_fp);
pdc->MoveTo(m_fp);
pdc->DPtoLP(&point);
pdc->LineTo(point);
}
ReleaseDC(pdc);*/
CDialog::OnLButtonUp(nFlags, point);
}
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void CDrawDlg::OnLButtonDown(UINT nFlags, CPoint point)
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{
// TODO: Add your message handler code here and/or call default
CWnd *pwnd=GetDlgItem(IDC_EDIT1);
CDC *pDC=pwnd->GetDC();
CRect rect;
this->ClientToScreen(&point);
pwnd->ScreenToClient(&point);
pwnd->GetClientRect(&rect);
if(rect.PtInRect(point))
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{
m_fp.x=point.x;
m_fp.y=point.y;
}
ReleaseDC(pDC);
m_bIsLButtonDawn =true;
CDialog::OnLButtonDown(nFlags, point);
}
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CTreeCtrl *pTree = (CTreeCtrl*)pDropWnd;
// pTree->ShowWindow(SW_HIDE);
CScheduleDlg *pDlg = (CScheduleDlg*)AfxGetMainWnd();
ClientToScreen(& pt2);
pTree->ScreenToClient(& pt2);
CString strText;
strText.Format("%d - %d", pt2.x, pt2.y);
pDlg->SetWindowText(strText);
// CTreeCtrl *pTree = & (pDlg->m_tcMyWorks);
HTREEITEM hItem = pTree->HitTest(pt2, &flags);
//鼠标经过时高亮显示
CImageList::DragShowNolock( false ); //避免鼠标经过时留下难看的痕迹
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if(hItem /**//*&& (flags & TVHT_ONITEM) || (flags & TVHT_ONITEMRIGHT)*/)
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{
// m_tc.SetFocus();
// m_tc.SelectItem(hItem);
pTree->SelectDropTarget( hItem );
// m_tc.Invalidate(); //flag tree needs to be redrawn
// m_tc.UpdateWindow(); //redraw tree
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// AfxMessageBox(m_tc.GetItemText(hItem));
}
CImageList::DragShowNolock( true );
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原文地址:https://www.cnblogs.com/shengshuai/p/1450668.html
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