如何禁止tab键在对话框内的编辑控件和按钮之间切换焦点?

2022-01-12 00:00:00 mfc

我有一个带有按钮和编辑框的对话框.
当编辑控件获得焦点时，如果我按 Tab 键，它会移动并聚焦按钮.
我希望 tab 键的工作方式不会切换焦点，而是应该作为编辑控件内的 tab 输入，即作为键输入到编辑框.

I have dialog box having buttons and edit box.
When edit control have focus then if I press tab key it moves and focus the button.
I wanted tab key work in such a way that it will not switch focus instead it should work as tab input inside edit control i.e. input to edit box as keys.

推荐答案

解决方案相当简单，主要包括处理 WM_GETDLGCODE 消息.这允许控件实现微调键盘处理(除其他外).

The solution is fairly simple, and essentially consists of handling the WM_GETDLGCODE message. This allows a control implementation to fine-tune keyboard handling (among other things).

在 MFC 中，这意味着:

In MFC this means:

  • 从 CEdit 派生自定义控件类.
  • 添加 ON_WM_GETDLGCODE消息映射的消息处理程序宏.
  • 实现 OnGetDlgCode 成员函数，将 DLGC_WANTTAB 标志添加到返回值.
  • 子类化对话框的控件，例如使用 DDX_Control 功能.
  • Derive a custom control class from CEdit.
  • Add the ON_WM_GETDLGCODE message handler macro to the message map.
  • Implement the OnGetDlgCode member function, that adds the DLGC_WANTTAB flag to the return value.
  • Subclass the dialog's control, e.g. using the DDX_Control function.

头文件:

class MyEdit : public CEdit {
protected:
    DECLARE_MESSAGE_MAP()
public:
    afx_msg UINT OnGetDlgCode();
};

实现文件:

BEGIN_MESSAGE_MAP(MyEdit, CEdit)
    ON_WM_GETDLGCODE()
END_MESSAGE_MAP

UINT MyEdit::OnGetDlgCode() {
    UINT value{ CEdit::OnGetDlgCore() };
    value |= DLGC_WANTTAB;
    return value;
}

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