【MFC】基於對話方塊程式選單欄不更新
阿新 • • 發佈:2018-12-15
環境:win10,vs2017
問題描述:
為mfc對話方塊程式添加了一個托盤選單,但這個托盤選單不響應ON_UPDATE_COMMAND_UI訊息,
並且設定選單項的勾選(SetCheck)時,可以通過程式碼觀察到勾選成功,但選單欄顯示的勾選狀態依然不變。
經過幾天的百度,終於發現了問題的所在
解決方法:
原因請參考原文章,這裡記錄一下解決方法
第一步:在程式Dlg類中,新增訊息響應
BEGIN_MESSAGE_MAP(CXXXDlg, CDialogEx)
//..
ON_WM_INITMENUPOPUP()
END_MESSAGE_MAP()
第二步:給Dlg類新增如下成員函式
//... class CXXXDlg : public CDialogEx { //... void OnInitMenuPopup(CMenu *pPopupMenu, UINT nIndex, BOOL bSysMenu); }; void CXXXDlg::OnInitMenuPopup(CMenu *pPopupMenu, UINT nIndex, BOOL bSysMenu) { // TODO: 在此處新增實現程式碼. ASSERT(pPopupMenu != NULL); // Check the enabled state of various menu items. CCmdUI state; state.m_pMenu = pPopupMenu; ASSERT(state.m_pOther == NULL); ASSERT(state.m_pParentMenu == NULL); // Determine if menu is popup in top-level menu and set m_pOther to // it if so (m_pParentMenu == NULL indicates that it is secondary popup). HMENU hParentMenu; if (AfxGetThreadState()->m_hTrackingMenu == pPopupMenu->m_hMenu) state.m_pParentMenu = pPopupMenu; // Parent == child for tracking popup. else if ((hParentMenu = ::GetMenu(m_hWnd)) != NULL) { CWnd* pParent = this; // Child windows don't have menus--need to go to the top! if (pParent != NULL && (hParentMenu = ::GetMenu(pParent->m_hWnd)) != NULL) { int nIndexMax = ::GetMenuItemCount(hParentMenu); for (int nIndex = 0; nIndex < nIndexMax; nIndex++) { if (::GetSubMenu(hParentMenu, nIndex) == pPopupMenu->m_hMenu) { // When popup is found, m_pParentMenu is containing menu. state.m_pParentMenu = CMenu::FromHandle(hParentMenu); break; } } } } state.m_nIndexMax = pPopupMenu->GetMenuItemCount(); for (state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax; state.m_nIndex++) { state.m_nID = pPopupMenu->GetMenuItemID(state.m_nIndex); if (state.m_nID == 0) continue; // Menu separator or invalid cmd - ignore it. ASSERT(state.m_pOther == NULL); ASSERT(state.m_pMenu != NULL); if (state.m_nID == (UINT)-1) { // Possibly a popup menu, route to first item of that popup. state.m_pSubMenu = pPopupMenu->GetSubMenu(state.m_nIndex); if (state.m_pSubMenu == NULL || (state.m_nID = state.m_pSubMenu->GetMenuItemID(0)) == 0 || state.m_nID == (UINT)-1) { continue; // First item of popup can't be routed to. } state.DoUpdate(this, TRUE); // Popups are never auto disabled. } else { // Normal menu item. // Auto enable/disable if frame window has m_bAutoMenuEnable // set and command is _not_ a system command. state.m_pSubMenu = NULL; state.DoUpdate(this, FALSE); } // Adjust for menu deletions and additions. UINT nCount = pPopupMenu->GetMenuItemCount(); if (nCount < state.m_nIndexMax) { state.m_nIndex -= (state.m_nIndexMax - nCount); while (state.m_nIndex < nCount && pPopupMenu->GetMenuItemID(state.m_nIndex) == state.m_nID) { state.m_nIndex++; } } state.m_nIndexMax = nCount; } }