wxWidgets Discussion Forum

Posted: **Thu Jun 15, 2006 11:19 am**

I got an context menu. How can I disable a entry of this context menu?

wxMenuItem::Enable(false) does not work. The entry is shown normal and I can activate it.

Posted: **Thu Jun 15, 2006 11:27 am**

As all MenuItem or ToolbarItem, you can disable (or check or other) a menu item with a wxUpdateUIEvent [1].

It is the same as http://forums.wxwidgets.org/viewtopic.php?t=8594
(first accepted answer).

[1] : http://www.wxwidgets.org/manuals/2.6.3/ ... ateuievent

Posted: **Thu Jun 15, 2006 11:47 am**

It looks very complicated for only disabling an menu entry. I do not understand how to use it. Is there a sample for that? The code in the referenced topic does not help me.

Why does wxMenuItem::Enable() does not work? For what is it?

Posted: **Thu Jun 15, 2006 11:59 am**

MoonKid wrote:It looks very complicated for only disabling an menu entry. I do not understand how to use it. Is there a sample for that? The code in the referenced topic does not help me.

Why does wxMenuItem::Enable() does not work? For what is it?

Could you post a piece of code where you want to use it ?

Posted: **Thu Jun 15, 2006 1:54 pm**

dsk wrote:Could you post a piece of code where you want to use it ?

Code: Select all

void OBBackupTree::OnItemMenu(wxTreeEvent& event)
{
    wxTreeItemId    item    (event.GetItem());
    wxPoint         point   (event.GetPoint());

    // right click on root item
    if (GetRootItem() == item)
    {
        wxMenu      menu;
        wxMenuItem  mItem1(&menu, OBID_BACKUPCTRL_ADDDESTINATION, _("add destination directory"));
                    mItem1.Enable(false);

        menu.Append(&mItem1);

        PopupMenu(&menu, point);
    }
}

Posted: **Thu Jun 15, 2006 2:10 pm**

MoonKid wrote:

dsk wrote:Could you post a piece of code where you want to use it ?

Code: Select all

void OBBackupTree::OnItemMenu(wxTreeEvent& event)
{
    wxTreeItemId    item    (event.GetItem());
    wxPoint         point   (event.GetPoint());

    // right click on root item
    if (GetRootItem() == item)
    {
        wxMenu      menu;
        wxMenuItem  mItem1(&menu, OBID_BACKUPCTRL_ADDDESTINATION, _("add destination directory"));
                    mItem1.Enable(false);

        menu.Append(&mItem1);

        PopupMenu(&menu, point);
    }
}

The wxWindow::PopupMenu documentation says:

Just before the menu is popped up, wxMenu::UpdateUI is called to ensure that the menu items are in the correct state. The menu does not get deleted by the window.

You can handle the EVT_UPDATE_UI event for identifier OBID_BACKUPCTRL_ADDDESTINATION.

Posted: **Thu Jun 15, 2006 2:16 pm**

benedicte wrote:You can handle the EVT_UPDATE_UI event for identifier OBID_BACKUPCTRL_ADDDESTINATION.

Sorry that is agains all my personal rules. Implementing an event handling for such a simple task is OVERHEAD. If such a event handling is needed for that the framework should handle it internaly without bother me with that.

I ask again: What is wxMenuItem::Enable() ? Why does n it work?

Posted: **Thu Jun 15, 2006 2:41 pm**

try putting the
mItem1.Enable(false);
after
menu.Append(&mItem1);

Code: Select all

menu.Append(&mItem1);
mItem1.Enable(false);

Posted: **Thu Jun 15, 2006 2:50 pm**

doublemax wrote:try...

No it works. But it is unlogical. A behavior like this should be in the docs.

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