如何处理 CEdit 控件中的 Return 键？

发布于 2024-07-14 07:19:42 字数 130 浏览 13 评论 0 原文

如何处理 CEdit 控件中的 Return 键 (VK_RETURN)？ CEdit 控件的父级是 CDialog。

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玩物 2024-07-21 07:19:42

您还可以在对话框的 PreTranslateMessage 中过滤键。如果您收到 VK_RETURN 的 WM_KEYDOWN，请调用 GetFocus。如果焦点位于编辑控件上，请调用编辑控件中按下的返回按钮的处理。

请注意，if 中的子句顺序依赖于短路才能高效。

BOOL CMyDialog::PreTranslateMessage(MSG* pMsg)
{
    if (pMsg->message == WM_KEYDOWN &&
        pMsg->wParam == VK_RETURN &&
        GetFocus() == m_EditControl)
    {
        // handle return pressed in edit control
        return TRUE; // this doesn't need processing anymore
    }
    return FALSE; // all other cases still need default processing
}

You could also filter for the key in your dialog's PreTranslateMessage. If you get WM_KEYDOWN for VK_RETURN, call GetFocus. If focus is on your edit control, call your handling for return pressed in the edit control.

Note the order of clauses in the if relies on short-circuiting to be efficient.

BOOL CMyDialog::PreTranslateMessage(MSG* pMsg)
{
    if (pMsg->message == WM_KEYDOWN &&
        pMsg->wParam == VK_RETURN &&
        GetFocus() == m_EditControl)
    {
        // handle return pressed in edit control
        return TRUE; // this doesn't need processing anymore
    }
    return FALSE; // all other cases still need default processing
}

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完美的未来在梦里 2024-07-21 07:19:42

正确的答案是处理 WM_GETDLGCODE / OnGetDlgCode 消息。在那里您可以指定您希望所有键都由您的类处理。

UINT CMyEdit::OnGetDlgCode()
{
    return CEdit::OnGetDlgCode() | DLGC_WANTALLKEYS;
}

The correct answer is to handle the WM_GETDLGCODE / OnGetDlgCode message. In there you can specify that you want all keys to be handled by your class.

UINT CMyEdit::OnGetDlgCode()
{
    return CEdit::OnGetDlgCode() | DLGC_WANTALLKEYS;
}

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┊风居住的梦幻卍 2024-07-21 07:19:42

确保在控件的对话框资源中设置了编辑控件样式 ES_WANTRETURN

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清风夜微凉 2024-07-21 07:19:42

默认情况下，Return 键会关闭 MFC 对话框。这是因为 Return 键会导致调用 CDialog 的 OnOK() 函数。您可以重写该函数以拦截 Return 键。我从本文（请参阅最后的方法3）。

首先，确保您已使用类向导，例如：

CEdit m_editFind;

接下来，您可以将以下函数原型添加到对话框的头文件中：

protected:
    virtual void OnOK();

然后您可以将以下实现添加到对话框的cpp文件中：

void CMyDialog::OnOK()
{
    if(GetFocus() == &m_editFind)
    {
        // TODO: Add your handling of the Return key here.
        TRACE0("Return key in edit control pressed\n");

        // Call `return` to leave the dialog open.
        return;
    }

    // Default behavior: Close the dialog.
    CDialog::OnOK();
}

请注意：如果对话框中有一个 ID 为 IDOK 的 OK 按钮，那么它也会调用 OnOK()。
如果这给您带来任何问题，那么您必须将按钮重定向到另一个处理程序函数。
方法 3 中也描述了如何执行此操作-key-from-edit-controls-in-a-dialog-box" rel="nofollow noreferrer">我上面提到的文章。

By default, the Return key closes an MFC dialog. This is, because the Return key causes the CDialog's OnOK() function to be called. You can override that function in order to intercept the Return key. I got the basic idea from this article (see Method 3 at the end).

First, make sure that you have added a member for the edit control to your dialog using the Class Wizard, for example:

CEdit m_editFind;

Next, you can add the following function prototype to the header file of your dialog:

protected:
    virtual void OnOK();

Then you can add the following implementation to the cpp file of your dialog:

void CMyDialog::OnOK()
{
    if(GetFocus() == &m_editFind)
    {
        // TODO: Add your handling of the Return key here.
        TRACE0("Return key in edit control pressed\n");

        // Call `return` to leave the dialog open.
        return;
    }

    // Default behavior: Close the dialog.
    CDialog::OnOK();
}

Please note: If you have an OK button in your dialog which has the ID IDOK, then it will also call OnOK().
If this causes any problems for you, then you have to redirect the button to another handler function.
How to do this is also described in Method 3 of the article that I have mentioned above.