WTL中如何子类化控件(转帖）

文章分类:C++编程

在开发中，大部分情况控件是直接通过rc文件创建的，但也有时候需要在程序中通过CreateWindow来创建控件，下面以Button控件为例说明子类化控件的两种方法。

class CButtonImpl : public CWindowImpl<CButtonImpl, CButton>
{
public:
    CButtonImpl(void)
    {
    }

    ~CButtonImpl(void)
    {
    }

    BEGIN_MSG_MAP(CButtonImpl)
        MESSAGE_HANDLER(WM_GETDLGCODE, OnGetDlgCode)
        DEFAULT_REFLECTION_HANDLER()
    END_MSG_MAP()

……

};

 
class CButtonImpl : public CWindowImpl<CButtonImpl, CButton>  
{  
public:  
    CButtonImpl(void)  
    {  
    }  
  
    ~CButtonImpl(void)  
    {  
    }  
  
    BEGIN_MSG_MAP(CButtonImpl)  
        MESSAGE_HANDLER(WM_GETDLGCODE, OnGetDlgCode)  
        DEFAULT_REFLECTION_HANDLER()  
    END_MSG_MAP()  
  
……  
  
}; 

方法一：使用DDX

class CTestDlg : public CDialogImpl<CTestDlg>, public CWinDataExchange<CTestDlg>
{
    BEGIN_MSG_MAP(CTestDlg)
        MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
    END_MSG_MAP()

    BEGIN_DDX_MAP(CTestDlg)
        DDX_CONTROL(IDC_BUTTON,  m_button)
    END_DDX_MAP()

……

    CButtonImpl m_button;
}

LRESULT CTestDlg::OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
{
    DoDataExchange(FALSE);
    return bHandled = FALSE;
}

 
class CTestDlg : public CDialogImpl<CTestDlg>, public CWinDataExchange<CTestDlg>  
{  
    BEGIN_MSG_MAP(CTestDlg)  
        MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)  
    END_MSG_MAP()  
  
    BEGIN_DDX_MAP(CTestDlg)  
        DDX_CONTROL(IDC_BUTTON,  m_button)  
    END_DDX_MAP()  
  
……  
  
    CButtonImpl m_button;  
}  
  
LRESULT CTestDlg::OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)  
{  
    DoDataExchange(FALSE);  
    return bHandled = FALSE;  
}

 

方法二：使用SubclassWindow

class CTestDlg : public CDialogImpl<CTestDlg>
{
    BEGIN_MSG_MAP(CTestDlg)
        MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
    END_MSG_MAP()

……

    CButtonImpl m_button;
}

LRESULT CTestDlg::OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
{
    // 程序中创建Button
    HWND hButton = CreateWindow(TEXT("BUTTON"), _T("test"), WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON, 0, 0, 0, 0, m_hWnd, (HMENU)0, hInst, 0);
    // 子类化
    m_button.SubclassWindow(hButton );
}