OnSize(UINT nType, int cx, int cy)

绿豆蛙2013 2008-09-02 08:15:27

这样得到的cx,cy是不是屏幕的宽度和高度？和GetSystemMetrics又有什么区别呢？我想设计一个任何像素的屏幕都能正常显示的界面，该用哪个函数？

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ykx_yeer 2008-09-02

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OnSize(UINT nType, int cx, int cy) 是用来响应窗口大小变化
cx和cy是窗口变化后客户区的宽度和高度

绿豆蛙2013 2008-09-02

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那OnSize(UINT nType, int cx, int cy) 的作用是什么呢？

datoucaicai 2008-09-02

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cx,cy是不是屏幕的宽度和高度？ //不是
用GetSystemMetrics

//这个你测试下就了解了

这是用MFC编写的使用openGL的视口代码。 CChildView::CChildView() 构造函数 CChildView::~CChildView() 析构函数 BEGIN_MESSAGE_MAP(CChildView,CWnd ) 消息映射 BOOL CChildView::PreCreateWindow(CREATESTRUCT& cs)创建窗口重新设置窗口参数 BOOL CChildView::PreTranslateMessage( MSG* pMsg ) 翻译消息 int CChildView::OnCreate( LPCREATESTRUCT lpCreateStruct ) 窗口创建好后进入此函数完成openGL的初始化 void CChildView::OnSize( UINT nType, int cx, int cy ) 当窗口大小发生改变时重新设置OPenGL的视口参数。 void CChildView::OnDestroy() 销毁窗口

一。大小和位置都改变 1.首先为窗体类添加CRect m_rect，该成员变量用来记录窗体的当前大小。 2.在类向导里面（Ctrl+W），为窗体添加消息WM_SIZE的响应函数OnSize(）；注意if(nType==1) return;这一句必须添加，否则最小化恢复的时候会出错。 void CPaperManagementDlg::OnSize(UINT nType, int cx, int cy) { CDialog::OnSize(nType, cx, cy); if(nType==1) return;//最小化则什么都不做 // TODO: Add your messa

sbyte、byte、short、ushort、int、uint、long、ulong8个是整数，他们之间的区别就是表示氛围不一样，而对于范围不一样的根本原因是类型在内存中的存储不同。

class CMainFrame : public CMDIFrameWnd { DECLARE_DYNAMIC(CMainFrame) public: CMainFrame(); // Attributes public: // Operations public: // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CMainFrame) virtual BOOL PreCreateWindow(CREATESTRUCT& cs); //}}AFX_VIRTUAL // Implementation public: virtual ~CMainFrame(); #ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const; #endif protected: // control bar embedded members CStatusBar m_wndStatusBar; CToolBar m_wndToolBar; CDialogBar m_wndTabBar; public: CMyTab m_MyTab; CViewManager m_ViewManager; // Generated message map functions protected: //{{AFX_MSG(CMainFrame) afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct); afx_msg void OnSize(UINT nType, int cx, int cy); //}}AFX_MSG DECLARE_MESSAGE_MAP()

Selecting the "Horizontal Scroll" and "Verticla Scroll" styles among the properties of your dialog box in the resource editor, you can add scroll bars to the dialog box. Remember also to select the 'resizing' border style. However for adding functionality to the scroll bars, you need to override the WM_VSCROLL and WM_HSCROLL message handlers. Also,override the WM_SIZE handler to set the scroll bar range if the size is reduced than the original. So you get the original size of the dialog in your OninitDialog(). The code would look something like this. Modify to your needs. 1. To OnInitDialog(),add the following line. GetWindowRect(m_rect); m_nScrollPos = 0; to get the original window size. Make m_rect a member variable of your dialog. Add another variable m_nScrollPos and initialize its value to zero. It stores the current vertical scroll position. 2. Here is the WM_SIZE handler for setting the scroll bar range.Set range 0 if size is increased more than original. void CCharlesDlg::OnSize(UINT nType, int cx, int cy) { CDialog::OnSize(nType, cx, cy); // TODO: Add your message handler code here m_nCurHeight = cy; int nScrollMax; if (cy < m_rect.Height()) { nScrollMax = m_rect.Height() - cy; } else nScrollMax = 0; SCROLLINFO si; si.cbSize = sizeof(SCROLLINFO); si.fMask = SIF_ALL;// SIF_ALL = SIF_PAGE | SIF_RANGE | SIF_POS; si.nMin = 0; si.nMax = nScrollMax; si.nPage = si.nMax/10; si.nPos = 0; SetScrollInfo(SB_VERT, &si, TRUE); } You need m_nCurHeight to store the current height of the dialog and use it to handle the scrolling in OnVScroll. m_ncurHeight is also a member variable of the dialog. 3. Here is the handler for WM_VSCROLL. void CCharlesDlg::OnVScroll(UINT nSBCode,UINT nPos,CScrollBar* pScrollBar) { //TODO:Add your message handler code here and/or call default int nDelta; int nMaxPos = m_rect.Height() - m_nCurHeight; switch(nSBCode) { case SB_LINEDOWN: if (m_nScrollPos >= nMaxPos) return; nDelta = min(nMaxPos/100,nMaxPos-m_nScrollPos); break; case SB_LINEUP: if (m_nScrollPos <= 0) return; nDelta = -min(nMaxPos/100,m_nScrollPos); break; case SB_PAGEDOWN: if (m_nScrollPos >= nMaxPos) return; nDelta = min(nMaxPos/10,nMaxPos-m_nScrollPos); break; case SB_THUMBPOSITION: nDelta = (int)nPos - m_nScrollPos; break; case SB_PAGEUP: if (m_nScrollPos <= 0) return; nDelta = -min(nMaxPos/10,m_nScrollPos); break; default: return; } m_nScrollPos += nDelta; SetScrollPos(SB_VERT,m_nScrollPos,TRUE); ScrollWindow(0,-nDelta); CDialog::OnVScroll(nSBCode, nPos, pScrollBar); } The above code handles the vertical scrolling. For horizontal scrolling add the WM_HSCROLL similarly and add the necessary code to OnSize and OnInitDialog. Information provided in this document and any software that may accompany this document is provided "as is" without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose. The user assumes the entire risk as to the accuracy and the use of this information.

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