请帮忙：自定义单选按钮没有 BN_CLICKED（MFC、VC++6）

发布于 2024-08-13 18:29:33 字数 665 浏览 2 评论 0原文

我派生了一个 CButton 类并创建了我自己的单选按钮控件。除了我无法让父对话框检测它何时单击单选按钮之外，一切都运行良好。

如果我调用 CButton::OnLButtonUp()，父对话框将检测单选按钮单击，但这样做的问题是框架也会绘制单选按钮。我不想这样做，因为我自己绘制单选按钮。

有人可以告诉我如何阻止 Windows/MFC 框架在这种情况下绘制控件吗？如果我不调用 CButton::OnLButtonUp() 那么是的，Windows/MFC 将不会绘制控件，但我的父对话框也不会收到 BN_CLICKED 通知。

我知道我可以将自定义消息发送回我的对话框，但我不希望这样 - 我希望与 BN_CLICKED 消息兼容。

正如您将在下面看到的，我还尝试将消息发布回所属对话框，但这也不起作用。

void CNCCheckBox::OnLButtonUp(UINT nFlags, CPoint point) 
{
  if( m_Owner )
    m_Owner->PostMessage( BN_CLICKED, (WPARAM) IDC_RAD_1/*GetDlgCtrlID()*/, (LPARAM) this->m_hWnd );
  //CButton::OnLButtonUp(nFlags,point); // Can't use this!!
}

原文

I have derived a CButton class and created my own radion button control. Its all working nicely with the exception that I can't get the parent dialog to detect when the radio button it clicked.

The parent dialog will detect the radio button click if I call CButton::OnLButtonUp() but the problem in doing that is that the framework also draws the radio button as well. I don't want to do that as I am drawing the radio button myself.

Can somebody please tell me how to stop Windows/MFC framework from drawing the control in this case? If I don't call CButton::OnLButtonUp() then yeah, Windows/MFC won't draw the control but my parent dialog won't get a BN_CLICKED notification either.

I know I could send a custom message back to my dialog but I don't want that - I want compatability with the BN_CLICKED message.

As you will see below, I have also tried posting a message back to the owning dialog and this doesn't work either.

void CNCCheckBox::OnLButtonUp(UINT nFlags, CPoint point) 
{
  if( m_Owner )
    m_Owner->PostMessage( BN_CLICKED, (WPARAM) IDC_RAD_1/*GetDlgCtrlID()*/, (LPARAM) this->m_hWnd );
  //CButton::OnLButtonUp(nFlags,point); // Can't use this!!
}

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岁月静好 2024-08-20 18:29:33

我已经解决了。我摆脱了 OnDrawItem() (AFX_MSG)，并添加了 DrawItem (AFX_VIRTUAL)。另外，在 PreSubClassWindow() 中，我将按钮的样式修改为 BS_PUSHBUTTON，并且 BN_CLICKED 事件现在被发送到我的父对话框。

简而言之：
- 不要使用 OnPaint()
- 不要使用 OnDrawItem()
- 使用：

//{{AFX_VIRTUAL(CNCCheckBox)
public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
protected:
virtual void PreSubclassWindow();
//}}AFX_VIRTUAL

I've solved it. I got rid of OnDrawItem() (AFX_MSG), and added DrawItem (AFX_VIRTUAL) instead. Also, in PreSubClassWindow() I modify the style to the button is treated as a BS_PUSHBUTTON and BN_CLICKED events are now being sent to my parent dialog.

So in short:
- Don't use OnPaint()
- Don't use OnDrawItem()
- Use:

//{{AFX_VIRTUAL(CNCCheckBox)
public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
protected:
virtual void PreSubclassWindow();
//}}AFX_VIRTUAL

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