本文共 1514 字，大约阅读时间需要 5 分钟。
- CMFCTabCtrl::EnableActiveTabCloseButton
用于在CMFCTabCtrl的Tab页显示一个关闭按钮，看看关闭按钮怎么实现：
- void CMFCBaseTabCtrl::OnLButtonDown(UINT nFlags, CPoint point)
- {
- m_bWindowPosChanged = FALSE;
- CWnd::OnLButtonDown(nFlags, point);
- if (m_rectCloseButton.PtInRect(point))
- {
- m_bTabCloseButtonPressed = TRUE;
- RedrawWindow(m_rectCloseButton);
- return ;
- }
- ...
- void CMFCBaseTabCtrl::OnLButtonUp(UINT nFlags, CPoint point)
- {
- if (m_bTabCloseButtonPressed)
- {
- m_bTabCloseButtonPressed = FALSE;
- m_bTabCloseButtonHighlighted = FALSE;
- RedrawWindow(m_rectCloseButton);
- if (m_rectCloseButton.PtInRect(point))
- {
- CWnd* pWndActive = GetActiveWnd();
- if (pWndActive != NULL)
- {
- pWndActive->SendMessage(WM_CLOSE);
- }
- return ;
- }
- }
- ...
应该就这些了。
在例子TabbedView中添加这个功能：
- int CTabbedViewView::OnCreate(LPCREATESTRUCT lpCreateStruct)
- {
- if (CTabView::OnCreate(lpCreateStruct) == -1)
- return -1;
- AddView (RUNTIME_CLASS (CView1), _T( "Simple" ), 100);
- AddView (RUNTIME_CLASS (CView2), _T( "List" ), 101);
- AddView (RUNTIME_CLASS (CView3), _T( "Form" ), 102);
- AddView (RUNTIME_CLASS (CView4), _T( "ScrollView" ), 102);
- m_wndTabs.EnableActiveTabCloseButton();
- return 0;
- }
然后点击一个页面上的关闭按钮，会发现这个tab页并没有消失，而切换到其他页面，程序就中断了，问题出在：
- BOOL CMFCTabCtrl::SetActiveTab( int iTab)
- {
- ...
- if (m_iActiveTab != -1 && m_bHideInactiveWnd)
- {
-
-
-
- CWnd* pWndActive = GetActiveWnd();
- if (pWndActive != NULL)
- {
- pWndActive->ShowWindow(SW_HIDE);
- }
- }
由于窗口已经销毁，而该Tab页仍然存在，所以m_iActiveTab就是被销毁的窗口所在页面，pWndActive是已经被销毁的窗口，自然调用其ShowWindow方法就出错了。
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