MFC的编辑框响应双击事件的三种方法
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正文
一. PreTranslateMessage结合位置信息法 在类中重写下面函数:
virtual BOOL PreTranslateMessage(MSG pMsg) override { if (pMsg->message == WM_LBUTTONDBLCLK) { CEdit ptr = (CEdit*)GetDlgItem(IDC_Edit); CRect rect; ptr->GetWindowRect(&rect); if (rect.PtInRect(pMsg->pt)) { //具体事务 } } return CDialog::PreTranslateMessage(pMsg); } 二. 子类继承法 创建CMyEdit类, 并创建一个其变量, 且与使用的编辑框进行DDX关联, 接着写双击事件的代码, 如下:
class CMyEdit : public CEdit { public: DECLARE_MESSAGE_MAP() afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point); }; BEGIN_MESSAGE_MAP(CMyEdit, CEdit) ON_WM_LBUTTONDBLCLK() END_MESSAGE_MAP() void CMyEdit::OnLButtonDblClk(UINT nFlags, CPoint point) { // TODO: 在此添加消息处理程序代码和/或调用默认值 CEdit::OnLButtonDblClk(nFlags, point); } 三. 子类发消息法
class CMyEdit : public CEdit { protected: virtual BOOL PreTranslateMessage(MSG * pMsg) override { if (pMsg->message == WM_LBUTTONDBLCLK) { //AfxWndProc接收BN_DOUBLECLICKED函数,并处理 AfxWndProc( GetParent()->GetSafeHwnd(), WM_COMMAND, (WPARAM)((BN_DOUBLECLICKED << 16) | GetDlgCtrlID()), (LPARAM)GetSafeHwnd()); } return __super::PreTranslateMessage(pMsg); } }; 或者使用:
//PostMessage发送系统消息BN_DOUBLECLICKED并处理 ::PostMessage( GetParent()->GetSafeHwnd(), WM_COMMAND, (BN_DOUBLECLICKED << 16) | GetDlgCtrlID(), (LPARAM)GetSafeHwnd()); 或者使用:
protected: virtual BOOL PreTranslateMessage(MSG * pMsg) override { //此PostMessage发送控件原生消息BN_DOUBLECLICKED并处理 if (pMsg->message == WM_LBUTTONDBLCLK) { if (m_hWnd) { ::PostMessage( ::GetParent(m_hWnd), WM_COMMAND, (WPARAM)((EM_LBUTTONDBLCLK() << 16) | (WPARAM)::GetDlgCtrlID(m_hWnd)), (LPARAM)GetSafeHwnd()); } } return __super::PreTranslateMessage(pMsg); } 可以使用下面的反射进行验证: 反射消息将先被编辑框捕获, 然后再传到其父类中去;
protected: BOOL On_EM_LBUTTONDBLCLK() { return 0; }
protected:
DEFINE_MESSAGE_MAP_BGN()
{
WM_COMMAND + WM_REFLECT_BASE, (WORD)CEdit_ResponseLButtonDblClick::EM_LBUTTONDBLCLK(), 0, 0, AfxSigCmd_b,
(AFX_PMSG)(static_cast<BOOL(AFX_MSG_CALL CCmdTarget::*)(void)> (&CEdit_ResponseLButtonDblClick::On_EM_LBUTTONDBLCLK))
}
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