protected override void OnSelectedChanged(ValueChangedEventArgs <bool> e)
{
if (!e.NewValue)
{
MousePositionTracker.Reset(true);
_canRadiusChangeUnratioble = false;
}
RaiseVisualChanged();
base.OnSelectedChanged(e);
}
protected override void OnMouseDown(MouseDownEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
var thisPosition = e.Position;
//若上次点击位置为空,则记录点击位置;
if (MousePositionTracker.LastMouseDownPosition == null)
{
if (thisPosition.IsAlmostEqualTo(Ellipse2D.Center))
{
MousePositionTracker.LastMouseDownPosition = thisPosition;
}
else if (thisPosition.IsAlmostEqualTo(Ellipse2D.GetTopPoint()) ||
thisPosition.IsAlmostEqualTo(Ellipse2D.GetBottomPoint()) ||
thisPosition.IsAlmostEqualTo(Ellipse2D.GetLeftPoint()) ||
thisPosition.IsAlmostEqualTo(Ellipse2D.GetRightPoint()))
{
MousePositionTracker.LastMouseDownPosition = thisPosition;
}
else
{
return;
}
e.Handled = true;
}
//否则将应用更改;
else if (MousePositionTracker.CurrentHoverPosition != null)
{
var newEllipse = GetPreviewEllipse2D();
if (newEllipse != null)
{
Ellipse2D = newEllipse;
}
MousePositionTracker.Reset(true);
e.Handled = true;
}
}
