☆1、概述 InternetExplore...... 1、概述 Internet Explorer有实在太多没有公布的东西。上一篇文章《Internet Explorer 编程简述(六)自定义浏览器上下文菜单》提到的获取“编码”菜单的方法就是利用了浏览器的上层窗口“Shell DocObject View”的未公布的命令ID。本文将要介绍的是如何用这个ID把“编码”菜单放到我们自己的菜单中来(如工具条上的“编码”按钮的下拉菜单)。 #define SHDVID_GETMIMECSETMENU 27 ...... CComPtr spCT; hr = pcmdTarget->QueryInterface(IID_IOleCommandTarget, (void**)&spCT); ...... // Get the language submenu hr = spCT->Exec(&CGID_ShellDocView, SHDVID_GETMIMECSETMENU, 0, NULL, &var); 2、原理 上面指向IOleCommandTarget接口的智能指针spCT是从IDocHostUIHandler::ShowContextMenu的参数pcmdTarget得到的,它其实也可以从HTML文档接口得到,这就是实现的关键。 3、实现 下面的代码演示了如何将“编码”菜单放置到我们自己的编码菜单上去。 void CMainFrame::OnDropDown( NMHDR* pNotifyStruct, LRESULT* pResult ) { const UINT CmdID_GetMimeSubMenu = 27; // Command ID for getting the Encoding submenu NMTOOLBAR* pNMToolBar = ( NMTOOLBAR* )pNotifyStruct; CMenu menu; CMenu* pPopup = 0; CMyHtmlView *pView = NULL; m_bIsEncodMenuPopup = false;//标志变量,用以在WM_INITMENUPOPUP消息处理函数中检查“编码”菜单 switch ( pNMToolBar->iItem ) { ...... case ID_VIEW_ENCODE://按下“编码”按钮 { m_bIsEncodMenuPopup = true; VERIFY( menu.LoadMenu( IDR_ENCODE ) );//IDR_ENCODE是预置的“编码”菜单资源,内含任意一项占位用的菜单 CMyHtmlView = GetActiveMyHtmlView();//检查当前是否存在活动的浏览器视图窗口 if ( pView != NULL ) { LPDISPATCH lpDispatch =pView->GetHtmlDocument();//获得文档指针 if ( lpDispatch != NULL ) { // Get an IDispatch pointer for the IOleCommandTarget interface. IOleCommandTarget * pCmdTarget = NULL; HRESULT hr = lpDispatch->QueryInterface(IID_IOleCommandTarget, (void**)&pCmdTarget); if ( SUCCEEDED( hr ) ) { VARIANT varEncSubMenu; ::VariantInit( &varEncSubMenu ); hr = pCmdTarget->Exec( &::CGID_ShellDocView, CmdID_GetMimeSubMenu, OLECMDEXECOPT_DODEFAULT, NULL, &varEncSubMenu ); if ( SUCCEEDED( hr ) ) { // 添加“编码”菜单 MENUITEMINFO miiEncoding; ::memset( &miiEncoding, 0, sizeof(MENUITEMINFO) ); miiEncoding.cbSize = sizeof(MENUITEMINFO); miiEncoding.fMask = MIIM_SUBMENU; miiEncoding.hSubMenu = reinterpret_cast< HMENU > (varEncSubMenu.byref); menu.SetMenuItemInfo(0, &miiEncoding, TRUE);//丢掉设计时占位用的菜单,替换为“编码”菜单 } } } } pPopup = menu.GetSubMenu( 0 ); break; } ...... } if ( pPopup != 0 ) { CRect rc; ::SendMessage( pNMToolBar->hdr.hwndFrom, TB_GETRECT, pNMToolBar->iItem, ( LPARAM )&rc ); rc.top = rc.bottom; ::ClientToScreen( pNMToolBar->hdr.hwndFrom, &rc.TopLeft() ); long lResult = pPopup->TrackPopupMenu( TPM_LEFTALIGN | TPM_LEFTBUTTON | TPM_RETURNCMD, rc.left, rc.top, this ); m_bIsEncodMenuPopup = false; if ( pNMToolBar->iItem == ID_VIEW_ENCODE ) { //其余的事教给浏览器去做,参考《Internet Explorer 编程简述(五)调用IE隐藏的命令(中文版)》 CFindIEWnd FindIEWnd( pView->m_wndBrowser.m_hWnd, "Internet Explorer_Server"); ::SendMessage( FindIEWnd.m_hWnd, WM_COMMAND, MAKEWPARAM(LOWORD(lResult), 0x0), 0 ); } else { SendMessage( WM_COMMAND, MAKEWPARAM(LOWORD(lResult), 0x0), 0 ); } } *pResult = TBDDRET_DEFAULT; } void CMainFrame::OnInitMenuPopup(CMenu* pPopupMenu, UINT nIndex, BOOL bSysMenu) { CMDIFrameWndEx::OnInitMenuPopup(pPopupMenu, nIndex, bSysMenu); if ( m_bIsEncodMenuPopup ) { //默认情况下“编码”的所有菜单项都是Disabled的,在此修改其状态为Enabled for ( UINT i=0; iGetMenuItemCount(); i++ ) { pPopupMenu->EnableMenuItem( pPopupMenu->GetMenuItemID( i ), MF_ENABLED | MF_BYCOMMAND ); } } } 这样一来,原本只在浏览器上下文菜单中出现的“编码”菜单就出现在了我们自己的工具条按钮下拉菜单上,无需更多的处理,菜单状态的改变,编码的设置等,一切都教给浏览器自己去完成了。 |
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