画刷更新

1. 屏幕布局
   
   成员变量准备

   class CDemoDlg : public CDialog
   {
   // Construction
   public:
    CDemoDlg(CWnd* pParent = NULL);    // standard constructor
    CRect m_example;
    CString brushs[4];
    int brush_datas[4];
    int brush_type;
   // Dialog Data
    //{{AFX_DATA(CDemoDlg)
    enum { IDD = IDD_DEMO_DIALOG };
    CListBox    m_list;

2. 为组件修改ID

   组件	ID
   列表框	IDC_BRUSH_LIST
   组合框	IDC_STATIC_EXAMPLE

3. 窗口初始化函数

   BOOL CDemoDlg::OnInitDialog()
   {
    ...
    // TODO: Add extra initialization here
    brushs[0] = "水平线";
    brush_datas[0] = HS_HORIZONTAL;
    brushs[1] = "竖直线";
    brush_datas[1] = HS_VERTICAL;
    brushs[2] = "向下斜线";
    brush_datas[2] = HS_DIAGCROSS;
    brushs[3] = "十字线";
    brush_datas[3] = HS_CROSS;
    // 添加
    for (int i = 0; i < 4; i++) {
        int index = m_list.AddString(brushs[i]);
        m_list.SetItemData(index, brush_datas[i]);
        if (i == 3) {
            m_list.SetCurSel(index);
            brush_type = m_list.GetItemData(m_list.GetCurSel());
        }
    }
    return TRUE;  // return TRUE  unless you set the focus to a control
   }

4. 列表框选择函数

   void CDemoDlg::OnSelchangeBrushList() 
   {
    // TODO: Add your control notification handler code here
    int index = m_list.GetCurSel();
    if (index != LB_ERR) {
        int type = (int)m_list.GetItemData(index);
        brush_type = type;
    }
    InvalidateRect(&m_example);
   }

5. Paint函数

   void CDemoDlg::OnPaint() 
   {
    if (IsIconic())
    {
        ...
    }
    else
    {
        COLORREF Color = RGB(255, 20, 30);
        GetDlgItem(IDC_STATIC_EXAMPLE)->GetWindowRect(&m_example);
        ScreenToClient(&m_example);
        int border = (m_example.right - m_example.left) / 6;
        m_example.InflateRect(-border, -30);
        CBrush brush(brush_type, Color);
        CPaintDC dc(this);
        dc.FillRect(&m_example, &brush);
        CDialog::OnPaint();
    }
   }

   运行结果
   

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