[Gtk-sharp-list] How to Give a TreeView Row a Different Color?

[Andy York]

Well I stand corrected, and pleasently so, I look forward to trying this.

  Thanks!

SpoodyGoon

On 5/9/2010 3:29 PM, Adam Tauno Williams wrote:
> On Sun, 2010-05-09 at 14:20 -0400, Andy York wrote:
>    
>> Jacek,
>> In Gtk it is not common to alter the row color as it is controlled by
>> the currently installed theme. I have had minor success with altering
>> the appearance of widgets without changing the theme but it has been a
>> frustrating task to say the least.
>>      
> Actually it is pretty straight forward.  But you apply the change via
> *cell* not *row*.  For example I have a method like -
>
>      internal static void Effect(
>        Gtk.TreeModel _model,
>        Gtk.TreeIter _iter,
>        Gtk.CellRendererText _cell,
>        Whitemice.ZOGI.Task _task)
>      {
>        /* Apply the "green bar effect" to make reading easier for older
> users */
>        if((_model.GetPath(_iter).Indices[0] % 2) == 1)
>          _cell.BackgroundGdk = GUI.ColorForKey("oddRowBackground");
>          else _cell.BackgroundGdk =
> GUI.ColorForKey("evenRowBackground");;
>        /* Make overdue tasks red and upcoming tasks blue */
>        if ((DateTime.Today>  _task.End)&&  (_task.IsActive))
>          _cell.ForegroundGdk = GUI.ColorForKey("overdueForeground");
>          else if (_task.Start>  DateTime.Today)
>            _cell.ForegroundGdk = GUI.ColorForKey("upcomingForeground");
>            else _cell.ForegroundGdk =
> GUI.ColorForKey("defaultForeground");
>      } /* End Effect */
>
> - which gets called by all of the render methods, such as -
>
>      internal static void RenderTitle(
>        Gtk.TreeViewColumn _column,
>        Gtk.CellRenderer _cell,
>        Gtk.TreeModel _model,
>        Gtk.TreeIter _iter)
>      {
>        Task task = IterTask(_model, _iter);
>        if(task == null)
>          return;
>        task = (Task)_model.GetValue(_iter, 0);
>        (_cell as Gtk.CellRendererText).Text = task.Name;
>        Effect(_model, _iter, (_cell as Gtk.CellRendererText), task);
>      } /* End RenderTitle */
>
> This does mean you have to have render methods for every column; but,
> honestly, you end up having to have lots of methods to do anything
> useful with the horror that is TreeView anyway.
>
> So you add columns to the TreeView like -
>
>        column = new Gtk.TreeViewColumn ();
>        column.Title = "Project";
>        column.Reorderable = true;
>        column.Resizable = true;
>        column.Clickable = true;
>        cell = new Gtk.CellRendererText ();
>        column.PackStart(cell, true);
>        column.SetCellDataFunc(cell,
>          new Gtk.TreeCellDataFunc(RenderProject));
>        _view.AppendColumn(column);
>
>   - then RenderProject calls Effect.
>
> Verbose, and kinda ugly, but it works 100% of the time; and you avoid
> the silly madness that is the whole theme-thing.
>
> I'm certain there is a faster and more elegant way to do the same thing
> via Hyena - by there is no documentation. :(
>    
>
>
>
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>    
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