06第六章 MFC程序设计-菜单

MFC程序设计菜单作者：李季主要内容菜单分类菜单创建菜单加载与显示响应菜单命令命令范围更新菜单项更新范围自制菜单创建上下文菜单菜单分类顶层菜单弹出式菜单–下拉式菜单–上下文菜单–层叠菜单自制菜单菜单创建编程方法，调用CreateMenu、InsertMenu等其他CMenu函数初始化定义菜单内容的数据结构，调用CMenu::LoadMenuIndirect创建菜单资源，在程序运行时加载生成的菜单菜单加载和显示CFrameWnd::Create–Create(NULL,_T(“MyApplication”),WS_OVERLOPPEDWINDOW,rectDefault,NULL,MAKEINTRESOURCE(IDR_MAINFRAME));CFrameWnd::LoadFrame–LoadFrame(IDR_MAINFRAME,WS_OVERLOPPEDWINDOW,NULL,NULL);CMenu::LoadMenu、CMenu::SetMenu–CMenumenu;Menu.LoadMenu(IDR_MAINFRAME);SetMenu(&menu);Menu.Detach();响应菜单命令WM_INITMENU:显示最高级菜单项之前WM_INITMENUPOPUP:显示子菜单项之前WM_MENUSELECT:报告加亮条在菜单中的最新位置WM_COMMAND–ON_COMMAND(ID_FILE_NEW,OnFileNew)–ON_COMMAND(ID_FILE_OPEN,OnFileOpen)–ON_COMMAND(ID_FILE_EXIT,OnFileExit)命令范围ON_COMMAND(ID_SHAPE_CIRCLE,OnShapeCircle)ON_COMMAND(ID_SHAPE_TRIANGLE,OnShapeTriangle)ON_COMMAND(ID_SHAPE_SQUARE,OnShapeSquare)…voidCMainWindow::OnShapeCircle(){m_nCurrentShape=0;}voidCMianWindow::OnShapeTriangle(){m_nCurrentShape=1;}voidCMainWindow::OnShapeSquare(){m_nCurrentShape=2;}命令范围ON_COMMAND(ID_SHAPE_CIRCLE,OnShape)ON_COMMAND(ID_SHAPE_TRIANGLE,OnShape)ON_COMMAND(ID_SHAPE_SQUARE,OnShape)…voidCMainWindow::OnShape(){UINTnShapeID=(UINT)LOWORD(GetCurrentMessage()-wParam);m_nCurrentShape=nShapeID–ID_SHAPE_CIRCLE;}命令范围ON_COMMAD_RANGE(ON_SHAPE_CIRCLE,ON_SHAPE_SQUARE,OnShape)…voidCMainWindow::OnShape(UINTnID){m_nCurrentShape=nID–ID_SHAPE_CIRCLE;}更新菜单项voidCMainWindow::OnShape(UINTnID){CMenu*pMenu=GetMenu();pMenu-CheckMenuItem(m_nCurrentShape+ID_SHAPE_CIRCLE,MF_UNCHECKED);pMenu-CheckMenuItem(nID,MF_CHECKED);m_nCurrentShape=nID-ID_SHAPE_CIRCLE);}更新菜单项ON_WM_INITMENUPOPUP()…voidCMainWindow::OnInitMenuPopup(CMenu*pPopupMenu,UINTnIndex,BOOLbSysMenu){if(!bSysMenu&&(nIndex==SHAPE_MENU_INDEX)){pPopupMenu-CheckMenuItem(ID_SHAPE_CIRCLE,MF_UNCHECKED);pPopupMenu-CheckMenuItem(ID_SHAPE_TRIANGLE,MF_UNCHECKED);pPopupMenu-CheckMenuItem(ID_SHAPE_SQUARE,MF_UNCHECKED);pPopupMenu-CheckMenuItem(m_nCurrentShape+ID_SHAPE_CIRCLE,MF_CHECKED);}}更新菜单项ON_COMMAD_RANGE(ID_SHAPE_CIRCLE,ID_SHAPE_SQUARE,OnShape)ON_UPDATE_COMMAND_UI(ID_SHAPE_CIRCLE,OnUpdateShapeCircle)ON_UPDATE_COMMAND_UI(ID_SHAPE_TRIANGLE,OnUpdateShapeTriangle)ON_UPDATE_COMMAND_UI(ID_SHAPE_SQUARE,OnUpdateShapeSquare)…voidCMainWindow::OnShape(UINTnID){m_nCurrentShape=nID–ID_SHAPE_CIRCLE;}voidCMainWindow::OnUpdateShapeCircle(CCmdUI*pCmdUI){pCmdUI-SetCheck(m_nCurrentShape==0);}voidCMainWindow::OnUpdateShapeTriangle(CCmdUI*pCmdUI){pCmdUI-SetCheck(m_nCurrentShape==1);}voidCMainWindow::OnUpdateShapeSquare(CCmdUI*pCmdUI){pCmdUI-SetCheck(m_nCurrentShape==2);}更新菜单项函数说明CCmdUI::Enable使菜单项有效或无效CCmdUI::SetCheck选中或取消选中的菜单项CCmdUI::SetRadio给菜单项添加或删除单选标记CCmdUI::SetText改变菜单项的正文更新范围ON_COMMAND_RANGE(ID_SHAPE_CIRCLE,ID_SHAPE_SQUARE,OnShape)ON_UPDATE_COMMAND_UI_RANGE(ID_SHAPE_CIRCLE,ID_SHAPE_SQUARE,OnUpdateShapeUI)…voidCMainWindow::OnShape(UINTnID){m_nCurrentShape=nID–ID_SHAPE_CIRCLE;}voidCMainWindow::OnUpdateShapeUI(CCmdUI*pCmdUI){pCmdUI-SetRadio(pCmdUI-m_nID–ID_SHAPE_CIRCLE==m_nCurrentShape);}自制菜单创建第一步：调用CMenu::ModifyMenu实现传统菜单项到自制菜单项的转化–CMenu*pMenu=newCMenu;pMenu-ModifyMenu(menuID,MF_OWNERDRAW,menuID);自制菜单创建第二步：添加WM_MEASUREITEM消息映射和相应的处理函数以及相关的消息-位图映射项–OnMeasureItem(intnIDCtl,LPMEASUREITEMSTRUCTlpMeasureItemStruct){设置菜单项高度和宽度}自制菜单创建第三步：添加WM_DRAWITEM消息映射和相应的处理函数–在这里实施绘制自制菜单的工作上下文菜单创建和加载上下文菜单–CMenumenu;menu.LoadMenu(IDR_CONTEXTMENU);CMenu*pContextMenu=menu.GetSubMenu(0);上下文菜单添加WM_CONTEXTMENU消息映射和相应处理函数在OnContextMenu()中首先确定弹出范围然后调用TrackPopupMenu()在指定位置显示上下文菜单