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<H1>[Gtk-sharp-list] cellrendererprogress confusion</H1>
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<B>Michael Hutchinson</B>
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<A HREF="mailto:gtk-sharp-list%40lists.ximian.com?Subject=%5BGtk-sharp-list%5D%20cellrendererprogress%20confusion&In-Reply-To=aec34c770902172340k44207711ydb330f1aea61ac70%40mail.gmail.com"
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TITLE="[Gtk-sharp-list] cellrendererprogress confusion">m.j.hutchinson at gmail.com
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<I>Wed Feb 18 03:01:22 EST 2009</I>
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<PRE>The AddValues method on the ListStore adds any number of objects to the
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columns of a single row, and unfortunately it's not strongly typed
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(primitive types are mapped to equivalent unmanaged types, which AFAIK is
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why you set up the type for the store and you can map these columns to cell
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renderer properties directly). This means your store has one row, containing
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a dictionary, which obviously can't be cast to 'thing'.
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You probably want something like
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foreach (thing t in thingDictionary.Values)
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store.AppendValues (t);
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Btw, where you're using an 'as' cast, you should use a () cast. The 'as'
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casts are useful when you expect them to fail sometimes in ordinary
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circumstances, because you can check for null. If you don't handle null
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you're just going to get a NullReferenceException when you try to use the
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casted value, whereas if a () cast fails, you get an InvalidCastException,
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which makes it more apparent where the problem is.
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On Feb 18, 2009 12:27 AM, "clarence clarence" <<A HREF="http://lists.ximian.com/mailman/listinfo/gtk-sharp-list">catchfire at gmail.com</A>> wrote:
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I guess i should be a bit more specific than my initial hand wavy post....
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So at the moment i have a...
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Dictionary<int, thing> thingDictionary = new Dictionary<int, thing>();
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to that i have added a new object of type 'thing" (the 'thing' object
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generates a number from 1 to 100 every second)....
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thingDictionary.Add(new thing());
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i create my ListStore etc....
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Gtk.ListStore store = new Gtk.ListStore(typeof(thing));
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treeview1.AppendColumn("gear", new Gtk.CellRendererProgress(),new
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TreeCellDataFunc(renderit));
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store.AppendValues(thingDictionary);
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treeview1.Model = store;
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The error I am getting is a "Cannot cast from source type to destination
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type" at the line indicated.....
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public void renderit(Gtk.TreeViewColumn col, Gtk.CellRenderer cell,
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Gtk.TreeModel model, Gtk.TreeIter iter)
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{
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Error Here -> thing tt = (thing) model.GetValue(iter,0);
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(cell as Gtk.CellRendererProgress).Value = tt.time;
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}
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Hope that is not too confusing ;)
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Cheers
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Gary A
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On Wed, Feb 18, 2009 at 1:22 PM, clarence clarence <<A HREF="http://lists.ximian.com/mailman/listinfo/gtk-sharp-list">catchfire at gmail.com</A>>
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wrote: > > hello. > > i a...
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--
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__________
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wow
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_______________________________________________
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Gtk-sharp-list maillist - <A HREF="http://lists.ximian.com/mailman/listinfo/gtk-sharp-list">Gtk-sharp-list at lists.ximian.com</A>
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<A HREF="http://lists.ximian.com/mailman/listinfo/gtk-sharp-list">http://lists.ximian.com/mailman/listinfo/gtk-sharp-list</A>
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