RadioButtonAutomationPeer.cs :  » 2.6.4-mono-.net-core » System.Windows » System » Windows » Automation » Peers » C# / CSharp Open Source

/*
 * RadioButtonAutomationPeer.cs.
 *
 * Contact:
 *   Moonlight List (moonlight-list@lists.ximian.com)
 *
 * Copyright 2009 Novell, Inc. (http://www.novell.com)
 *
 * See the LICENSE file included with the distribution for details.
 *
 */

using System;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;

namespace System.Windows.Automation.Peers{
  public class RadioButtonAutomationPeer : ToggleButtonAutomationPeer,
    ISelectionItemProvider
  {
    public RadioButtonAutomationPeer (RadioButton owner)
      : base (owner)
    {
      isSelected = IsSelected;

      // UIA Event SelectionItemPatternIdentifiers.IsSelectedProperty
      // raised by ToggleButton.OnIsCheckedPropertyChanged().
    }

    public override object GetPattern (PatternInterface patternInterface)
    {
      if (patternInterface == PatternInterface.SelectionItem)
        return this;
      else if (patternInterface == PatternInterface.Toggle)
        // Mirrors the SL implementation
        return null;
      return base.GetPattern (patternInterface);
    }

    protected override string GetClassNameCore ()
    {
      return "RadioButton";
    }

    protected override AutomationControlType GetAutomationControlTypeCore ()
    {
      return AutomationControlType.RadioButton;
    }

    #region ISelectionItemProvider implementation

    void ISelectionItemProvider.AddToSelection ()
    {
      throw new InvalidOperationException ();
    }

    void ISelectionItemProvider.RemoveFromSelection ()
    {
      RadioButton radioButton = (RadioButton) Owner;
      if (radioButton.IsChecked == true)
        throw new InvalidOperationException ();
    }

    void ISelectionItemProvider.Select ()
    {
      RadioButton radioButton = (RadioButton) Owner;
      if (!radioButton.IsEnabled)
        throw new ElementNotEnabledException ();

      radioButton.IsChecked = true;
    }

    bool ISelectionItemProvider.IsSelected {
      get { return IsSelected; }
    }

    IRawElementProviderSimple ISelectionItemProvider.SelectionContainer {
      get { return null; }
    }

    #endregion

    internal override void RaiseToggleStateChanged ()
    {
      base.RaiseToggleStateChanged ();

      if (((RadioButton) Owner).IsChecked == null)
        return;

      RaisePropertyChangedEvent (SelectionItemPatternIdentifiers.IsSelectedProperty,
                                 isSelected,
               IsSelected);
      isSelected = IsSelected;
    } 

    private bool IsSelected {
      get { return ((RadioButton) Owner).IsChecked == true; }
    }

    private bool isSelected;
  }
}