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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Windows.Automation.Provider;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
namespace System.Windows.Automation.Peers
{
///
public class ExpanderAutomationPeer : FrameworkElementAutomationPeer, IExpandCollapseProvider
{
///
public ExpanderAutomationPeer(Expander owner): base(owner)
{}
///
override protected string GetClassNameCore()
{
return "Expander";
}
///
override protected AutomationControlType GetAutomationControlTypeCore()
{
return AutomationControlType.Group;
}
/// Go through the children and if we find the templated toggle button set its event source to this AutomationPeer
protected override List<AutomationPeer> GetChildrenCore()
{
List<AutomationPeer> children = base.GetChildrenCore();
ToggleButton expanderToggleButton = ((Expander)Owner).ExpanderToggleButton;
if (!AccessibilitySwitches.UseNetFx47CompatibleAccessibilityFeatures && children != null)
{
foreach (UIElementAutomationPeer peer in children)
{
if (peer.Owner == expanderToggleButton)
{
peer.EventsSource = (!AccessibilitySwitches.UseNetFx472CompatibleAccessibilityFeatures && this.EventsSource != null) ? this.EventsSource : this;
break;
}
}
}
return children;
}
/// The expander should have Automation Keyboard focus whenever the actual focus is set in the toggle button
override protected bool HasKeyboardFocusCore()
{
return ((!AccessibilitySwitches.UseNetFx47CompatibleAccessibilityFeatures && ((Expander)Owner).IsExpanderToggleButtonFocused)
|| base.HasKeyboardFocusCore());
}
///
override public object GetPattern(PatternInterface pattern)
{
object iface = null;
if(pattern == PatternInterface.ExpandCollapse)
{
iface = this;
}
else
{
iface = base.GetPattern(pattern);
}
return iface;
}
#region ExpandCollapse
/// <summary>
/// Blocking method that returns after the element has been expanded.
/// </summary>
/// <returns>true if the node was successfully expanded</returns>
void IExpandCollapseProvider.Expand()
{
if (!IsEnabled())
throw new ElementNotEnabledException();
Expander owner = (Expander)((ExpanderAutomationPeer)this).Owner;
owner.IsExpanded = true;
}
/// <summary>
/// Blocking method that returns after the element has been collapsed.
/// </summary>
/// <returns>true if the node was successfully collapsed</returns>
void IExpandCollapseProvider.Collapse()
{
if (!IsEnabled())
throw new ElementNotEnabledException();
Expander owner = (Expander)((ExpanderAutomationPeer)this).Owner;
owner.IsExpanded = false;
}
///<summary>indicates an element's current Collapsed or Expanded state</summary>
ExpandCollapseState IExpandCollapseProvider.ExpandCollapseState
{
get
{
Expander owner = (Expander)((ExpanderAutomationPeer)this).Owner;
return owner.IsExpanded ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed;
}
}
// BUG 1555137: Never inline, as we don't want to unnecessarily link the automation DLL
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
internal void RaiseExpandCollapseAutomationEvent(bool oldValue, bool newValue)
{
RaisePropertyChangedEvent(
ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty,
oldValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed,
newValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed);
}
#endregion ExpandCollapse
}
}
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