/// <summary>
/// Recalculates the size of the presenter to match its parent.
/// </summary>
/// <param name="sender">Sender</param>
/// <param name="e">Event args</param>
private void OnSizeChanged(object sender, SizeChangedEventArgs e)
{
if (_presenter != null)
{
ExpanderView parent = _presenter.GetParentByType <ExpanderView>();
GeneralTransform gt = parent.TransformToVisual(_presenter);
Point childToParentCoordinates = gt.TransformPoint(new Point(0, 0));
_presenter.Width = parent.RenderSize.Width + childToParentCoordinates.X;
}
}
/// <summary>
/// IsExpandedProperty changed handler.
/// </summary>
/// <param name="obj">The dependency object.</param>
/// <param name="e">The event information.</param>
private static void OnIsExpandedPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
ExpanderView source = (ExpanderView)obj;
RoutedEventArgs args = new RoutedEventArgs();
if ((bool)e.NewValue)
{
source.OnExpanded(args);
}
else
{
source.OnCollapsed(args);
}
source.UpdateVisualState(source._useTransitions);
}
/// <summary>
/// IsNonExpandableProperty changed handler.
/// </summary>
/// <param name="obj">The dependency object.</param>
/// <param name="e">The event information.</param>
private static void OnIsNonExpandablePropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
ExpanderView source = (ExpanderView)obj;
if ((bool)e.NewValue)
{
if (source.IsExpanded)
{
source._useTransitions = false;
source.IsExpanded = false;
}
}
else
{
source._useTransitions = true;
}
source.UpdateVisualState(source._useTransitions);
}
/// <summary>
/// NonExpandableHeaderTemplate changed handler.
/// </summary>
/// <param name="obj">The dependency object.</param>
/// <param name="e">The event information.</param>
private static void OnNonExpandableHeaderTemplatePropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
ExpanderView source = (ExpanderView)obj;
source.OnNonExpandableHeaderTemplateChanged((DataTemplate)e.OldValue, (DataTemplate)e.NewValue);
}
/// <summary>
/// ExpanderProperty changed handler.
/// </summary>
/// <param name="obj">The dependency object.</param>
/// <param name="e">The event information.</param>
private static void OnExpanderPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
ExpanderView source = (ExpanderView)obj;
source.OnExpanderChanged(e.OldValue, e.NewValue);
}