/// <summary>
/// Handles changes on the <see cref="ObserveChildItemsProperty"/> dependency property. As
/// WPF internally uses the dependency property system and bypasses the
/// <see cref="ObserveChildItems"/> property wrapper, updates should be handled here.
/// </summary>
/// <param name="d">The currently processed owner of the property.</param>
/// <param name="e">Provides information about the updated property.</param>
private static void ObserveChildItemsPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//don't do anything if the control is being created
TreeViewBase <T> owner = (TreeViewBase <T>)d;
if (!owner.IsInitialized)
{
return;
}
//recreate the three
owner.Refresh(owner.GetTreeLayout());
}
/// <summary>
/// Handles changes on the <see cref="RootNodeProperty"/> dependency property. As
/// WPF internally uses the dependency property system and bypasses the
/// <see cref="RootNode"/> property wrapper, updates should be handled here.
/// </summary>
/// <param name="d">The currently processed owner of the property.</param>
/// <param name="e">Provides information about the updated property.</param>
private static void RootNodePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//just recreate the tree - this takes care of everything
TreeViewBase <T> owner = (TreeViewBase <T>)d;
TreeViewItem newValue = (TreeViewItem)e.NewValue;
//don't do anything if the control is being created
if (!owner.IsInitialized)
{
return;
}
owner.Refresh(owner.GetTreeLayout());
//apply sorting on root or tree (if the new value is null)
owner.ApplySorting(newValue, null);
}
/// <summary>
/// Handles changes on the <see cref="TreeProperty"/> dependency property. As
/// WPF internally uses the dependency property system and bypasses the
/// <see cref="TreeView"/> property wrapper, updates should be handled here.
/// </summary>
/// <param name="d">The currently processed owner of the property.</param>
/// <param name="e">Provides information about the updated property.</param>
private static void TreePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TreeViewBase <T> owner = (TreeViewBase <T>)d;
TreeView oldValue = (TreeView)e.OldValue;
TreeView newValue = (TreeView)e.NewValue;
if (oldValue != null)
{
//deregister event listeners
oldValue.SelectedItemChanged -= owner.OnSelectedItemChanged;
oldValue.MouseRightButtonUp -= owner.OnRightMouseButtonUp;
}
//set the tree as the control content
owner.Content = newValue;
//only assign a style if it's not null
if (newValue != null && owner.TreeStyle != null)
{
newValue.Style = owner.TreeStyle;
}
if (newValue != null)
{
//register event listeners
newValue.SelectedItemChanged += owner.OnSelectedItemChanged;
newValue.MouseRightButtonUp += owner.OnRightMouseButtonUp;
}
//don't do anything if the control is being created
if (!owner.IsInitialized)
{
return;
}
//render the tree
owner.Refresh();
}