protected override void OnKeyDown(KeyRoutedEventArgs e)
{
if (!Interaction.AllowKeyDown(e))
{
return;
}
base.OnKeyDown(e);
if (e.Handled)
{
return;
}
// Some keys (e.g. Left/Right) need to be translated in RightToLeft mode
VirtualKey invariantKey = InteractionHelper.GetLogicalKey(FlowDirection, e.Key);
switch (invariantKey)
{
case VirtualKey.Left:
{
RatingItem ratingItem = FocusManager.GetFocusedElement() as RatingItem;
if (ratingItem != null)
{
ratingItem = GetRatingItemAtOffsetFrom(ratingItem, -1);
}
else
{
ratingItem = GetRatingItems().FirstOrDefault();
}
if (ratingItem != null)
{
if (ratingItem.Focus(FocusState.Keyboard))
{
e.Handled = true;
}
}
}
break;
case VirtualKey.Right:
{
RatingItem ratingItem = FocusManager.GetFocusedElement() as RatingItem;
if (ratingItem != null)
{
ratingItem = GetRatingItemAtOffsetFrom(ratingItem, 1);
}
else
{
ratingItem = GetRatingItems().FirstOrDefault();
}
if (ratingItem != null)
{
if (ratingItem.Focus(FocusState.Keyboard))
{
e.Handled = true;
}
}
}
break;
case VirtualKey.Add:
{
if (this.IsEnabled)
{
RatingItem ratingItem = GetSelectedRatingItem();
if (ratingItem != null)
{
ratingItem = GetRatingItemAtOffsetFrom(ratingItem, 1);
}
else
{
ratingItem = GetRatingItems().FirstOrDefault();
}
if (ratingItem != null)
{
ratingItem.SelectValue();
e.Handled = true;
}
}
}
break;
case VirtualKey.Subtract:
{
if (this.IsEnabled)
{
RatingItem ratingItem = GetSelectedRatingItem();
if (ratingItem != null)
{
ratingItem = GetRatingItemAtOffsetFrom(ratingItem, -1);
}
if (ratingItem != null)
{
ratingItem.SelectValue();
e.Handled = true;
}
}
}
break;
}
}
