Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Automation / Peers / GroupItemAutomationPeer.cs / 1477467 / GroupItemAutomationPeer.cs
using System; using System.Collections; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Security; using System.Text; using System.Windows; using System.Windows.Automation.Provider; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Data; using System.Windows.Interop; using System.Windows.Media; using MS.Internal; using MS.Win32; namespace System.Windows.Automation.Peers { /// public class GroupItemAutomationPeer : FrameworkElementAutomationPeer { /// public GroupItemAutomationPeer(GroupItem owner): base(owner) { } /// override protected string GetClassNameCore() { return "GroupItem"; } /// override protected AutomationControlType GetAutomationControlTypeCore() { return AutomationControlType.Group; } /// override protected bool IsOffscreenCore() { if (!Owner.IsVisible) return true; Rect boundingRect = CalculateVisibleBoundingRect(); return (boundingRect == Rect.Empty || boundingRect.Height == 0 || boundingRect.Width == 0); } /// protected override ListGetChildrenCore() { GroupItem owner = (GroupItem)Owner; ItemsControl itemsControl = ItemsControl.ItemsControlFromItemContainer(Owner); if (itemsControl != null) { ItemsControlAutomationPeer itemsControlAP = itemsControl.CreateAutomationPeer() as ItemsControlAutomationPeer; if (itemsControlAP != null) { ItemContainerGenerator generator = owner.Generator; if (generator != null) { IList items = generator.Items; List children = new List (items.Count); ItemPeersStorage oldChildren = _dataChildren; //cache the old ones for possible reuse _dataChildren = new ItemPeersStorage (); if (items.Count > 0) { foreach (object item in items) { CollectionViewGroup cvg = item as CollectionViewGroup; if (cvg != null) { GroupItem groupItem = generator.ContainerFromItem(item) as GroupItem; if (groupItem != null) { GroupItemAutomationPeer peer = groupItem.CreateAutomationPeer() as GroupItemAutomationPeer; if (peer != null) children.Add(peer); } } else { //try to reuse old peer if it exists ItemAutomationPeer peer = oldChildren[item]; //no old peer - create new one if (peer == null) peer = itemsControlAP.CreateItemAutomationPeerInternal(item); //perform hookup so the events sourced from wrapper peer are fired as if from the data item if (peer != null) { AutomationPeer wrapperPeer = peer.GetWrapperPeer(); if (wrapperPeer != null) { wrapperPeer.EventsSource = peer; if (peer.ChildrenValid && peer.Children == null && this.AncestorsInvalid) { peer.AncestorsInvalid = true; wrapperPeer.AncestorsInvalid = true; } } } //protection from indistinguishable items - for example, 2 strings with same value //this scenario does not work in ItemsControl however is not checked for. if (_dataChildren[item] == null) { children.Add(peer); _dataChildren[item] = peer; // Update ItemsControl cache too // ItemPeers needs to be updated because used in Selector and other ItemsControl subclasses to access item peers directly if (itemsControlAP.ItemPeers[item] == null) { itemsControlAP.ItemPeers[item] = peer; } } } } return children; } } } } return null; } private ItemPeersStorage _dataChildren = new ItemPeersStorage (); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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