Re: Added tooltip to display details of items in TreeView

[Bob Caryl <bob fis-cal com>]

Tony Yum wrote:

> Andrew E. Makeev wrote:
>
> > Tony Yum wrote:
> >
> > > Dear all,
> > >
> > > I have just started using gtkmm and forgive me if the question might 
> > > be a bit silly. But I don't seemed to be able to add tooltip to 
> > > treeview items. i.e. I wish to display detail of the items in the 
> > > treeview when I hover hover it. The tooltip object sets the text for 
> > > the entire treeview, so I thought about listening to mouse motions 
> > > on the treeview widget and then setting the tooltip appropriately. 
> > > However as soon as I add content to the tree, the 
> > > signal_motion_notify_event no longer sends signal to the slot that I 
> > > connected to.
> >
> >
> >
> > I have implemented TreeView tooltip. Works both for Gtkmm-2.2 & 2.4.
> >
> > See my motion notify callback. I guess, you forgot to generate ENTER 
> > notify event to let TreeView widget think that mouse just entered, 
> > otherwise it will hide tooltip. Actually, it requires some 
> > optimization, but that is not critical issue.
>
>
> Thanx for the reply.
>
> I don't think I understand what you mean by generating an ENTER notify 
> event? Doesn't gtkmm widget know that when a mouse is entered anyway? 
> If not do I have to attach the signal_enter_notify_event to some slot? 
> What slot do I have to attached it to?
>
> I looked around the mail list and I found this:
>
> http://mail.gnome.org/archives/gtkmm-list/2002-November/msg00165.html
>
> which basically says use this function:
>
> add_events(Gtk::POINTER_MOTION_MASK)
>
> But my compiler complains that POINTER_MOTION_MASK does not exist in 
> the Gtk namespace. I then did a grep for this in the gtkmm header 
> files and could not find it? Maybe I am using gtkmm-2.6
>
>
> <http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1Widget.html#a208> 
>
>
> > The main problem is that no one has answered how to change tooltip 
> > position on the fly, i.e. how to display tooltip at the Cell but 
> > below TreeView.
> >
> >    bool Grid::motion_notify_cb( GdkEventMotion* event )
> >    {
> >    Gtk::TreeModel::Path path;
> >    Gtk::TreeViewColumn *column;
> >    int cell_x, cell_y;
> >
> >    if ( view.get_path_at_pos( (int)event->x,
> >                   (int)event->y,
> >                   path, column,
> >                   cell_x, cell_y ) )
> >    {
> >        Gtk::TreeModel::Row row = *viewStore->get_iter( path );
> >        Glib::ustring tip = get_cell_tooltip( path, 
> > column->get_title() ); // this function is setting tooltip text 
> > depending on mouse position
> >        if( !tip.empty() )
> >        {
> >        instanceProperties.tooltips->set_tip( view, tip );
> >        GdkEventCrossing* user_event = 
> > (GdkEventCrossing*)gdk_event_new( GDK_ENTER_NOTIFY );
> >        user_event->window = event->window;
> >        user_event->send_event = TRUE;
> >        user_event->subwindow = event->window;
> >        user_event->time = event->time;
> >        user_event->x = event->x;
> >        user_event->y = event->y;
> >        user_event->x_root = event->x_root;
> >        user_event->y_root = event->y_root;
> >        user_event->mode = GDK_CROSSING_NORMAL;
> >        user_event->detail = GDK_NOTIFY_ANCESTOR;
> >        user_event->focus = TRUE;
> >        Gdk::Event cpp_event( (GdkEvent*)user_event );
> >        cpp_event.put();
> >        }
> >        else
> >        {
> >        instanceProperties.tooltips->unset_tip( view );
> >        }
> >    }
> >    else
> >    {
> >        instanceProperties.tooltips->unset_tip( view );
> >    }
> >    return false;
> >    }
> I'll give the above a try once I can get the tree to listen to mouse 
> motion.
> _______________________________________________
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> gtkmm-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtkmm-list
Maybe you want "Gdk::POINTER_MOTION_MASK" ?

Bob Caryl