/* XXX: Uncomment when ximian bug #81343 is closed and usable.
* protected override void OnActivate ()
* {
* foreach (IPlot plot in plots)
* {
* plot.UnselectAll ();
* }
*
* foreach (IPlot plot in plots)
* {
* if (plot.HasFocus) {
* int x, y;
* plot.GetFocusedPoint (axes, out x, out y);
* plot.SelectPoint (axes, x, y);
* break;
* }
* }
* }
*/
protected override bool OnFocused(DirectionType dir)
{
if (plots.Count < 1)
{
return(false);
}
if (!HasFocus)
{
GrabFocus();
return(true);
}
int visits;
int focused_x = -1, focused_y = -1;
switch (dir)
{
case DirectionType.Left:
((IPlot)plots[focused_plot_index]).FocusPrev();
return(true);
case DirectionType.Right:
((IPlot)plots[focused_plot_index]).FocusNext();
return(true);
case DirectionType.Up:
// Don't move selection if there is only one
// plot
if (plots.Count <= 1)
{
return(true);
}
// get the currently focused point
((IPlot)plots[focused_plot_index]).GetFocusedPoint(out focused_x,
out focused_y);
// Iterate through the plots in the zorder,
// looking for the next plot which CanFocus.
// Also, make sure we don't see plots twice, or
// infinite loop.
visits = 0;
do
{
// move to the next plot in the z-order
focused_plot_index--;
if (focused_plot_index < 0)
{
focused_plot_index = plots.Count - 1;
}
visits++;
IPlot plot = (IPlot)plots[focused_plot_index];
if (!plot.CanFocus)
{
continue;
}
// clear focus on all the plots
foreach (IPlot p in plots)
{
if (p.HasFocus)
{
p.ReleaseFocus();
}
}
// focus the nearest to the last
// focused point
plot.FocusNearest(focused_x, focused_y);
break;
} while (visits <= plots.Count);
return(true);
case DirectionType.Down:
// Don't move selection if there is only one
// plot
if (plots.Count <= 1)
{
return(true);
}
// get the currently focused point
((IPlot)plots[focused_plot_index]).GetFocusedPoint(out focused_x,
out focused_y);
// Iterate through the plots in the zorder,
// looking for the next plot which CanFocus.
// Also, make sure we don't see plots more than
// once, or worse, infinite loop.
visits = 0;
do
{
// move to the previous plot in the z-order
focused_plot_index++;
if (focused_plot_index >= plots.Count)
{
focused_plot_index = 0;
}
visits++;
IPlot plot = (IPlot)plots[focused_plot_index];
if (!plot.CanFocus)
{
continue;
}
// clear focus on all the plots
foreach (IPlot p in plots)
{
if (p.HasFocus)
{
p.ReleaseFocus();
}
}
// focus the nearest to the last
// focused point
plot.FocusNearest(focused_x, focused_y);
break;
} while (visits <= plots.Count);
return(true);
case DirectionType.TabForward:
default:
// let focus jump to the next widget
return(false);
}
}