CODEWITHSUNDEEP
c++visual-studio-2010mfc
pintee
pintee

Reputation: 119

VS2010 C++ MFC Hide Toolbar

I'm having trouble understanding just how the View Menu turns off the Standard Toolbar in terms of code.

If I understand correctly, the standard toolbar is defined in the .rc file as follows:

IDR_MAINFRAME TOOLBAR 16, 15
BEGIN
    BUTTON      ID_FILE_NEW
    BUTTON      ID_FILE_OPEN
    BUTTON      ID_FILE_SAVE
    SEPARATOR
    BUTTON      ID_EDIT_CUT
    BUTTON      ID_EDIT_COPY
    BUTTON      ID_EDIT_PASTE
    SEPARATOR
    BUTTON      ID_FILE_PRINT
    BUTTON      ID_APP_ABOUT
END

Similarly the View Menu, which allows you to turn the Standard Toolbar on and off is defined as follows:

IDR_MAINFRAME MENU
BEGIN
    POPUP "&File"
    BEGIN
        MENUITEM "&New\tCtrl+N",                ID_FILE_NEW
        MENUITEM "&Open...\tCtrl+O",            ID_FILE_OPEN
        MENUITEM "&Close",                      ID_FILE_CLOSE
        MENUITEM SEPARATOR
        MENUITEM "P&rint Setup...",             ID_FILE_PRINT_SETUP
        MENUITEM SEPARATOR
        MENUITEM "Recent File",                 ID_FILE_MRU_FILE1,GRAYED
        MENUITEM SEPARATOR
        MENUITEM "E&xit",                       ID_APP_EXIT
    END
    POPUP "&View"
    BEGIN
        POPUP "&Toolbars and Docking Windows"
        BEGIN
            MENUITEM "<placeholder>",           ID_VIEW_TOOLBAR
        END
        MENUITEM "&Status Bar",                 ID_VIEW_STATUS_BAR
        POPUP "&Application Look"
        BEGIN
            MENUITEM "Windows &2000",           ID_VIEW_APPLOOK_WIN_2000
            MENUITEM "Office &XP",              ID_VIEW_APPLOOK_OFF_XP
            MENUITEM "&Windows XP",             ID_VIEW_APPLOOK_WIN_XP
            MENUITEM "Office 200&3",            ID_VIEW_APPLOOK_OFF_2003
            MENUITEM "Visual Studio 200&5",     ID_VIEW_APPLOOK_VS_2005
            MENUITEM "Visual Studio 200&8",     ID_VIEW_APPLOOK_VS_2008
            POPUP "Office 200&7"
            BEGIN
                MENUITEM "&Blue Style",         ID_VIEW_APPLOOK_OFF_2007_BLUE
                MENUITEM "B&lack Style",        ID_VIEW_APPLOOK_OFF_2007_BLACK
                MENUITEM "&Silver Style",       ID_VIEW_APPLOOK_OFF_2007_SILVER
                MENUITEM "&Aqua Style",         ID_VIEW_APPLOOK_OFF_2007_AQUA
            END
        END
    END
    POPUP "&Help"
    BEGIN
        MENUITEM "&About Emergence...",          ID_APP_ABOUT
    END
END

Now my reasoning is this....in order for the MENUITEM that allows you to toggle the Standard Toolbar on and off to work, ID_VIEW_TOOLBAR must somehow reference the toolbar definition itself. I have searched the entire project and nowhere can I find where ID_VIEW_TOOLBAR is associated with the Standard Toolbar definition. Surely there must be some relationship linking ID_VIEW_TOOLBAR to the definition of IDR_MAINFRAME TOOLBAR 16, 15 in order to toggle it on and off??

If not, could you kindly explain how ID_VIEW_TOOLBAR turns off the Standard Toolbar?

Thanks for your time.

Upvotes: 2

Views: 3118

Answers (1)

IInspectable
IInspectable

Reputation: 51503

ID_VIEW_TOOLBAR is a Standard Command ID. TN022: Standard Commands Implementation explains how these are handled. In case of the ID_VIEW_TOOLBAR:

ID_VIEW_TOOLBAR Toggles the toolbar on and off

CFrameWnd handles this command and the update-command UI handler to toggle the visible state of the toolbar. The toolbar must be a child window of the frame with child window ID of AFX_IDW_TOOLBAR. The command handler actually toggles the visibility of the toolbar window. CFrameWnd::RecalcLayout is used to redraw the frame window with the toolbar in its new state. The update-command UI handler checks the menu item when the toolbar is visible.

Customization of this command handler is not recommended. If you wish to add additional toolbars, you will want to clone and modify the command handler and the update-command UI handler for this command.

The connection is etablished in your CMainFrame::OnCreate override. It calls m_wndToolBar.CreateEx, leaving out the final optional parameter: The control ID AFX_IDW_TOOLBAR. It then proceeds to call m_wndToolBar.LoadToolBar(IDR_MAINFRAME). This constructs the toolbar from your TOOLBAR resource with ID IDR_MAINFRAME.

Upvotes: 3

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