protected override void OnDispose()
{
if (this.Value is SolidColorBrush && colorCanvas != null)
{
TargetDependencyProperty.RemoveValueChanged(Target, Brush_Changed);
colorCanvas.SelectedColorChanged -= ColorCanvas_SelectedColorChanged;
colorCanvas = null;
}
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
colorCanvas = GetTemplateChild <ColorCanvas>("PART_colorCanvas");
if (this.Value is SolidColorBrush brush)
{
colorCanvas.SelectedColor = brush.Color;
TargetDependencyProperty.AddValueChanged(Target, Brush_Changed);
colorCanvas.SelectedColorChanged += ColorCanvas_SelectedColorChanged;
}
else
{
this.IsEnabled = false;
}
}