/// <summary>
/// Adds the current element to the collection of selected items.
/// </summary>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
void ISelectionItemProvider.AddToSelection()
{
TreeViewItem owner = OwnerTreeViewItem;
TreeView parent = owner.ParentTreeView;
if (parent == null || (parent.SelectedItem != null && parent.SelectedContainer != Owner))
{
throw new InvalidOperationException("Controls.Properties.Resources.Automation_OperationCannotBePerformed");
}
owner.IsSelected = true;
}
void RefreshItem(mwc.TreeViewItem item)
{
if (item == null)
{
return;
}
var old = item.DataContext;
item.DataContext = null;
item.DataContext = old;
#if TODO_XAML
item.InvalidateProperty(EtoTreeViewItem.IsExpandedProperty);
item.HeaderTemplate = item.HeaderTemplate == template1 ? template2 : template1;
#endif
}
/// <summary>
/// Hides all nodes, controls, or content that are descendants of the
/// control.
/// </summary>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
void IExpandCollapseProvider.Collapse()
{
if (!IsEnabled())
{
throw new ElementNotEnabledException();
}
TreeViewItem owner = OwnerTreeViewItem;
if (!owner.HasItems)
{
throw new InvalidOperationException("Controls.Properties.Resources.Automation_OperationCannotBePerformed");
}
owner.IsExpanded = false;
}
///// <summary>
///// Gets the collection of child elements of the
///// <see cref="T:WinRTXamlToolkit.Controls.TreeView" /> that is associated
///// with this
///// <see cref="T:System.Windows.Automation.Peers.TreeViewAutomationPeer" />.
///// </summary>
///// <returns>The collection of child elements.</returns>
//[SuppressMessage("Microsoft.Design", "CA1002:DoNotExposeGenericLists", Justification = "Required by automation")]
//protected override List<AutomationPeer> GetChildrenCore()
//{
// TreeView owner = OwnerTreeView;
// ItemCollection items = owner.Items;
// if (items.Count <= 0)
// {
// return null;
// }
// List<AutomationPeer> peers = new List<AutomationPeer>(items.Count);
// for (int i = 0; i < items.Count; i++)
// {
// TreeViewItem element = owner.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem;
// if (element != null)
// {
// peers.Add(
// FrameworkElementAutomationPeer.FromElement(element) ??
// FrameworkElementAutomationPeer.CreatePeerForElement(element));
// }
// }
// return peers;
//}
/// <summary>
/// Retrieves a UI automation provider for each child element that is
/// selected.
/// </summary>
/// <returns>An array of UI automation providers.</returns>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
IRawElementProviderSimple[] ISelectionProvider.GetSelection()
{
IRawElementProviderSimple[] selection = null;
TreeViewItem selectedItem = OwnerTreeView.SelectedContainer;
if (selectedItem != null)
{
AutomationPeer peer = FrameworkElementAutomationPeer.FromElement(selectedItem);
if (peer != null)
{
selection = new IRawElementProviderSimple[] { ProviderFromPeer(peer) };
}
}
return(selection ?? new IRawElementProviderSimple[] { });
}
/// <summary>
/// Scrolls the content area of a container object in order to display
/// the control within the visible region (viewport) of the container.
/// </summary>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
void IScrollItemProvider.ScrollIntoView()
{
// Note: WPF just calls BringIntoView on the current TreeViewItem.
// This actually raises an event that can be handled by the
// its containers. Silverlight doesn't support this, so we will
// approximate by moving scrolling the TreeView's ScrollHost to the
// item.
// Get the parent TreeView
TreeViewItem owner = OwnerTreeViewItem;
TreeView parent = owner.ParentTreeView;
if (parent == null)
{
return;
}
// Scroll the item into view
parent.ItemsControlHelper.ScrollIntoView(owner);
}
/// <summary>
/// Select any descendents when adding new TreeViewItems to a TreeView.
/// </summary>
/// <param name="item">The added item.</param>
internal void CheckForSelectedDescendents(TreeViewItem item)
{
Debug.Assert(item != null, "item should not be null!");
Stack<TreeViewItem> items = new Stack<TreeViewItem>();
items.Push(item);
// Recurse into subtree of each added item to ensure none of
// its descendents are selected.
while (items.Count > 0)
{
TreeViewItem current = items.Pop();
if (current.IsSelected)
{
// Make IsSelected false so that its property changed
// handler will be fired when it's set to true in
// ChangeSelection
current.IgnorePropertyChange = true;
current.IsSelected = false;
ChangeSelection(current, current, true);
// If the item is not in the visual tree, we will make sure
// every check for ContainsSelection will try and update the
// sequence of ContainsSelection flags for the
// SelectedContainer.
if (SelectedContainer.ParentItemsControl == null)
{
SelectedContainer.RequiresContainsSelectionUpdate = true;
}
}
foreach (TreeViewItem nestedItem in current.Items.OfType<TreeViewItem>())
{
items.Push(nestedItem);
}
}
}
/// <summary>
/// Change whether a TreeViewItem is selected.
/// </summary>
/// <param name="itemOrContainer">
/// Item whose selection is changing.
/// </param>
/// <param name="container">
/// Container of the item whose selection is changing.
/// </param>
/// <param name="selected">
/// A value indicating whether the TreeViewItem is selected.
/// </param>
internal void ChangeSelection(object itemOrContainer, TreeViewItem container, bool selected)
{
// Ignore any change notifications if we're alread in the middle of
// changing the selection
if (IsSelectionChangeActive)
{
return;
}
object oldValue = null;
object newValue = null;
bool raiseSelectionChanged = false;
TreeViewItem element = SelectedContainer;
// Start changing the selection
IsSelectionChangeActive = true;
try
{
if (selected && container != SelectedContainer)
{
// Unselect the old value
oldValue = SelectedItem;
if (SelectedContainer != null)
{
SelectedContainer.IsSelected = false;
SelectedContainer.UpdateContainsSelection(false);
}
// Select the new value
newValue = itemOrContainer;
SelectedContainer = container;
SelectedContainer.UpdateContainsSelection(true);
SelectedItem = itemOrContainer;
UpdateSelectedValue(itemOrContainer);
raiseSelectionChanged = true;
// Scroll the selected item into view. We only want to
// scroll the header into view, if possible, because an
// expanded TreeViewItem contains all of its child items
// as well.
ItemsControlHelper.ScrollIntoView(container.HeaderElement ?? container);
}
else if (!selected && container == SelectedContainer)
{
// Unselect the old value
SelectedContainer.UpdateContainsSelection(false);
SelectedContainer = null;
SelectedItem = null;
SelectedValue = null;
oldValue = itemOrContainer;
raiseSelectionChanged = true;
}
container.IsSelected = selected;
}
finally
{
// Finish changing the selection
IsSelectionChangeActive = false;
}
// Notify when the selection changes
if (raiseSelectionChanged)
{
if (SelectedContainer != null && AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementSelected))
{
AutomationPeer peer = FrameworkElementAutomationPeer.CreatePeerForElement(SelectedContainer);
if (peer != null)
{
peer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementSelected);
}
}
if (element != null && AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection))
{
AutomationPeer peer = FrameworkElementAutomationPeer.CreatePeerForElement(element);
if (peer != null)
{
peer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection);
}
}
OnSelectedItemChanged(new RoutedPropertyChangedEventArgs<object>(oldValue, newValue));
}
}
/// <summary>
/// Initializes a new instance of the
/// <see cref="T:System.Windows.Automation.Peers.TreeViewItemAutomationPeer" />
/// class.
/// </summary>
/// <param name="owner">
/// The <see cref="T:WinRTXamlToolkit.Controls.TreeViewItem" /> instance
/// to associate with this
/// <see cref="T:System.Windows.Automation.Peers.TreeViewItemAutomationPeer" />.
/// </param>
public TreeViewItemAutomationPeer(TreeViewItem owner)
: base(owner)
{
}
/// <summary>
/// Initializes a new instance of the
/// <see cref="T:System.Windows.Automation.Peers.TreeViewItemAutomationPeer" />
/// class.
/// </summary>
/// <param name="owner">
/// The <see cref="T:WinRTXamlToolkit.Controls.TreeViewItem" /> instance
/// to associate with this
/// <see cref="T:System.Windows.Automation.Peers.TreeViewItemAutomationPeer" />.
/// </param>
public TreeViewItemAutomationPeer(TreeViewItem owner)
: base(owner)
{
}
