protected override int GetNextPosition(int position, FlexibleView.LayoutManager.Direction direction)
{
if (mOrientation == HORIZONTAL)
{
switch (direction)
{
case FlexibleView.LayoutManager.Direction.Left:
if (position > 0)
{
return(position - 1);
}
break;
case FlexibleView.LayoutManager.Direction.Right:
if (position < ItemCount - 1)
{
return(position + 1);
}
break;
}
}
else
{
switch (direction)
{
case FlexibleView.LayoutManager.Direction.Up:
if (position > 0)
{
return(position - 1);
}
break;
case FlexibleView.LayoutManager.Direction.Down:
if (position < ItemCount - 1)
{
return(position + 1);
}
break;
}
}
return(NO_POSITION);
}
// Converts a focusDirection to orientation.
//
// @param focusDirection One of {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
// {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT},
// {@link View#FOCUS_BACKWARD}, {@link View#FOCUS_FORWARD}
// or 0 for not applicable
// @return {@link LayoutState#LAYOUT_START} or {@link LayoutState#LAYOUT_END} if focus direction
// is applicable to current state, {@link LayoutState#INVALID_LAYOUT} otherwise.
private int ConvertFocusDirectionToLayoutDirection(FlexibleView.LayoutManager.Direction focusDirection)
{
switch (focusDirection)
{
case FlexibleView.LayoutManager.Direction.Up:
return(mOrientation == VERTICAL ? LayoutState.LAYOUT_START
: LayoutState.INVALID_LAYOUT);
case FlexibleView.LayoutManager.Direction.Down:
return(mOrientation == VERTICAL ? LayoutState.LAYOUT_END
: LayoutState.INVALID_LAYOUT);
case FlexibleView.LayoutManager.Direction.Left:
return(mOrientation == HORIZONTAL ? LayoutState.LAYOUT_START
: LayoutState.INVALID_LAYOUT);
case FlexibleView.LayoutManager.Direction.Right:
return(mOrientation == HORIZONTAL ? LayoutState.LAYOUT_END
: LayoutState.INVALID_LAYOUT);
default:
return(LayoutState.INVALID_LAYOUT);
}
}
internal override FlexibleView.ViewHolder OnFocusSearchFailed(FlexibleView.ViewHolder focused, FlexibleView.LayoutManager.Direction direction, FlexibleView.Recycler recycler)
{
if (ChildCount == 0)
{
return(null);
}
int layoutDir = ConvertFocusDirectionToLayoutDirection(direction);
if (layoutDir == LayoutState.INVALID_LAYOUT)
{
return(null);
}
int maxScroll = (int)(MAX_SCROLL_FACTOR * mOrientationHelper.GetTotalSpace());
UpdateLayoutState(layoutDir, maxScroll, false);
mLayoutState.ScrollingOffset = LayoutState.SCROLLING_OFFSET_NaN;
mLayoutState.Recycle = false;
Fill(recycler, mLayoutState, true, true);
FlexibleView.ViewHolder nextFocus;
if (layoutDir == LayoutState.LAYOUT_START)
{
nextFocus = GetChildAt(0);
}
else
{
nextFocus = GetChildAt(ChildCount - 1);
}
return(nextFocus);
}
