/// <summary>
/// Get the parent OldFluidWrapPanel and check if the AssociatedObject is
/// hosted inside a ListBoxItem (this scenario will occur if the OldFluidWrapPanel
/// is the ItemsPanel for a ListBox).
/// </summary>
private void GetParentPanel()
{
if ((AssociatedObject as FrameworkElement) == null)
{
return;
}
var ancestor = (FrameworkElement)AssociatedObject;
while (ancestor != null)
{
if (ancestor is ListBoxItem)
{
_parentLbItem = ancestor as ListBoxItem;
}
if (ancestor is FluidWrapPanel)
{
_parentFwPanel = ancestor as FluidWrapPanel;
// No need to go further up
return;
}
// Find the visual ancestor of the current item
ancestor = VisualTreeHelper.GetParent(ancestor) as FrameworkElement;
}
}
/// <summary>
/// Handles changes to the DragEasing property.
/// </summary>
/// <param name="d">FluidWrapPanel</param>
/// <param name="e">DependencyProperty changed event arguments</param>
private static void OnDragEasingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FluidWrapPanel panel = (FluidWrapPanel)d;
EasingFunctionBase oldDragEasing = (EasingFunctionBase)e.OldValue;
EasingFunctionBase newDragEasing = panel.DragEasing;
panel.OnDragEasingChanged(oldDragEasing, newDragEasing);
}
/// <summary>
/// Handles changes to the Orientation property.
/// </summary>
/// <param name="d">FluidWrapPanel</param>
/// <param name="e">DependencyProperty changed event arguments</param>
private static void OnOrientationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FluidWrapPanel panel = (FluidWrapPanel)d;
Orientation oldOrientation = (Orientation)e.OldValue;
Orientation newOrientation = panel.Orientation;
panel.OnOrientationChanged(oldOrientation, newOrientation);
}
/// <summary>
/// Handles changes to the ItemsSource property.
/// </summary>
/// <param name="d">FluidWrapPanel</param>
/// <param name="e">DependencyProperty changed event arguments</param>
private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FluidWrapPanel panel = (FluidWrapPanel)d;
IEnumerable oldItemsSource = (ObservableCollection <UIElement>)e.OldValue;
IEnumerable newItemsSource = panel.ItemsSource;
panel.OnItemsSourceChanged(oldItemsSource, newItemsSource);
}
/// <summary>
/// Handles changes to the ItemWidth property.
/// </summary>
/// <param name="d">FluidWrapPanel</param>
/// <param name="e">DependencyProperty changed event arguments</param>
private static void OnItemWidthChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FluidWrapPanel fwPanel = (FluidWrapPanel)d;
double oldItemWidth = (double)e.OldValue;
double newItemWidth = fwPanel.ItemWidth;
fwPanel.OnItemWidthChanged(oldItemWidth, newItemWidth);
}
/// <summary>
/// Handles changes to the IsComposing property.
/// </summary>
/// <param name="d">FluidWrapPanel</param>
/// <param name="e">DependencyProperty changed event arguments</param>
private static void OnIsComposingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FluidWrapPanel panel = (FluidWrapPanel)d;
bool oldIsComposing = (bool)e.OldValue;
bool newIsComposing = panel.IsComposing;
panel.OnIsComposingChanged(oldIsComposing, newIsComposing);
}
/// <summary>
/// Handles changes to the DragScale property.
/// </summary>
/// <param name="d">FluidWrapPanel</param>
/// <param name="e">DependencyProperty changed event arguments</param>
private static void OnDragScaleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FluidWrapPanel panel = (FluidWrapPanel)d;
double oldDragScale = (double)e.OldValue;
double newDragScale = panel.DragScale;
panel.OnDragScaleChanged(oldDragScale, newDragScale);
}