private protected Point GetMoveFocusDestinationLocation(double distance)
{
Point Origin;
if (Focus is ILayoutTextFocus AsTextFocus)
{
Debug.Assert(CaretPosition >= 0 && CaretPosition <= MaxCaretPosition);
ILayoutTextFocusableCellView CellView = AsTextFocus.CellView;
double Position;
if (CaretMode == CaretModes.Override && CaretPosition < MaxCaretPosition)
{
Position = (CellView.CellSize.Width.Draw * ((CaretPosition * 2) + 1)) / (MaxCaretPosition * 2);
Origin = CellView.CellOrigin.Moved(new Measure()
{
Draw = Position
}, new Measure()
{
Draw = CellView.CellSize.Height.Draw / 2
});
}
else
{
Position = (CellView.CellSize.Width.Draw * CaretPosition) / MaxCaretPosition;
Origin = CellView.CellOrigin.Moved(new Measure()
{
Draw = Position
}, new Measure()
{
Draw = CellView.CellSize.Height.Draw / 2
});
}
}
else
{
ILayoutFocusableCellView CellView = Focus.CellView;
Origin = CellView.CellOrigin.Moved(new Measure()
{
Draw = CellView.CellSize.Width.Draw / 2
}, new Measure()
{
Draw = CellView.CellSize.Height.Draw / 2
});
}
Debug.Assert(RegionHelper.IsValid(Origin));
Origin = Origin.Moved(Measure.Zero, new Measure()
{
Draw = distance
});
return(Origin);
}
private void FindClosestFocusVertical(double distance, int oldFocusIndex, ref int newFocusIndex, ref double bestVerticalDistance, ref double bestHorizontalDistance)
{
Point Origin = GetMoveFocusDestinationLocation(distance);
for (int i = 0; i < FocusChain.Count; i++)
{
int CellIndex = distance < 0 ? i : FocusChain.Count - i - 1;
ILayoutFocus TestFocus = (ILayoutFocus)FocusChain[CellIndex];
ILayoutFocusableCellView CellView = TestFocus.CellView;
// If we check against the current focus, it might be the closest cell and then we don't move!
if (CellIndex == oldFocusIndex)
{
continue;
}
// Don't consider cells that are in the wrong direction;
if ((distance < 0 && CellView.CellOrigin.Y.Draw >= Origin.Y.Draw) || (distance > 0 && CellView.CellOrigin.Y.Draw + CellView.CellSize.Height.Draw <= Origin.Y.Draw))
{
continue;
}
if (CellView.CellRect.IsPointInRect(Origin.X.Draw, Origin.Y.Draw))
{
newFocusIndex = CellIndex;
break;
}
else
{
Point Center = CellView.CellRect.Center;
double VerticalDistance = Math.Abs((Center.Y - Origin.Y).Draw);
double HorizontalDistance = Math.Abs((Center.X - Origin.X).Draw);
if (newFocusIndex < 0 || bestVerticalDistance > VerticalDistance || (RegionHelper.IsZero(bestVerticalDistance - VerticalDistance) && bestHorizontalDistance > HorizontalDistance))
{
bestVerticalDistance = VerticalDistance;
bestHorizontalDistance = HorizontalDistance;
newFocusIndex = CellIndex;
}
}
}
}
private void FindClosestFocusHorizontal(int direction, ref int newFocusIndex, ref double bestSquaredDistance)
{
Point FocusCellOrigin = Focus.CellView.CellOrigin;
Size FocusCellSize = Focus.CellView.CellSize;
Point FocusCellCenter = Focus.CellView.CellRect.Center;
for (int i = 0; i < FocusChain.Count; i++)
{
int CellIndex = direction < 0 ? i : FocusChain.Count - i - 1;
ILayoutFocus TestFocus = (ILayoutFocus)FocusChain[CellIndex];
ILayoutFocusableCellView TestCellView = TestFocus.CellView;
Point TestCellOrigin = TestCellView.CellOrigin;
Size TestCellSize = TestCellView.CellSize;
Point TestCellCenter = TestCellView.CellRect.Center;
// Don't consider cells that are not on the same line;
if ((TestCellOrigin.Y.Draw + TestCellSize.Height.Draw <= FocusCellOrigin.Y.Draw) || (TestCellOrigin.Y.Draw >= FocusCellOrigin.Y.Draw + FocusCellSize.Height.Draw))
{
continue;
}
// Don't consider cells that are in the wrong direction;
if ((direction < 0 && TestCellOrigin.X.Draw >= FocusCellOrigin.X.Draw + FocusCellSize.Width.Draw) || (direction >= 0 && TestCellOrigin.X.Draw + TestCellSize.Width.Draw <= FocusCellOrigin.X.Draw))
{
continue;
}
double SquaredDistance = Point.SquaredDistance(FocusCellCenter, TestCellCenter);
if (newFocusIndex < 0 || bestSquaredDistance < SquaredDistance)
{
bestSquaredDistance = SquaredDistance;
newFocusIndex = CellIndex;
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="LayoutFocus"/> class.
/// </summary>
public LayoutFocus(ILayoutFocusableCellView cellView)
: base(cellView)
{
}
