protected override void OnPointerPressed(PointerPressedEventArgs e)
{
e.Device.Capture(this);
_lastPoint = e.GetPosition(this);
var ev = new VectorEventArgs
{
RoutedEvent = DragStartedEvent,
Vector = (Vector)_lastPoint,
};
RaiseEvent(ev);
}
protected override void OnPointerMoved(PointerEventArgs e)
{
if (_lastPoint.HasValue)
{
var ev = new VectorEventArgs
{
RoutedEvent = DragDeltaEvent,
Vector = e.GetPosition(this) - _lastPoint.Value,
};
RaiseEvent(ev);
}
}
protected override void OnDragDelta(VectorEventArgs e)
{
var delta = Orientation == Orientation.Vertical ? e.Vector.X : e.Vector.Y;
double max;
double min;
GetDeltaConstraints(out min, out max);
delta = Math.Min(Math.Max(delta, min), max);
foreach (var definition in _definitions)
{
if (definition == _prevDefinition)
{
SetLengthInStars(_prevDefinition, GetActualLength(_prevDefinition) + delta);
}
else if (definition == _nextDefinition)
{
SetLengthInStars(_nextDefinition, GetActualLength(_nextDefinition) - delta);
}
else if (IsStar(definition))
{
SetLengthInStars(definition, GetActualLength(definition)); // same size but in stars.
}
}
}
private void ThumbDragged(object sender, VectorEventArgs e)
{
double range = Maximum - Minimum;
double value = Value;
double offset;
if (Orientation == Orientation.Horizontal)
{
offset = e.Vector.X / ((Bounds.Size.Width - Thumb.Bounds.Size.Width) / range);
}
else
{
offset = e.Vector.Y * (range / (Bounds.Size.Height - Thumb.Bounds.Size.Height));
}
if (!double.IsNaN(offset) && !double.IsInfinity(offset))
{
value += offset;
value = Math.Max(value, Minimum);
value = Math.Min(value, Maximum);
Value = value;
}
}
protected override void OnPointerReleased(PointerEventArgs e)
{
if (_lastPoint.HasValue)
{
e.Device.Capture(null);
_lastPoint = null;
var ev = new VectorEventArgs
{
RoutedEvent = DragCompletedEvent,
Vector = (Vector)e.GetPosition(this),
};
RaiseEvent(ev);
}
}
protected virtual void OnDragCompleted(VectorEventArgs e)
{
}
protected virtual void OnDragDelta(VectorEventArgs e)
{
}
protected virtual void OnDragStarted(VectorEventArgs e)
{
}
/// <summary>
/// Called when user dragging the <see cref="Thumb"/>.
/// </summary>
/// <param name="e"></param>
protected virtual void OnThumbDragDelta(VectorEventArgs e)
{
Thumb thumb = e.Source as Thumb;
if (thumb != null && _track.Thumb == thumb)
{
MoveToNextTick(_track.Value);
}
}