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

/*
 * ToggleButtonAutomationPeer.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 ToggleButtonAutomationPeer : ButtonBaseAutomationPeer, IToggleProvider
  {
    public ToggleButtonAutomationPeer (ToggleButton owner)
      : base (owner)
    {
      this.owner = owner;

      // UIA Event TogglePatternIdentifiers.ToggleStateProperty
      // raised by ToggleButton.OnIsCheckedPropertyChanged().
      toggleState = ToggleState;
    }

    public override object GetPattern (PatternInterface patternInterface)
    {
      if (patternInterface == PatternInterface.Toggle)
        return this;
      return base.GetPattern (patternInterface);
    }

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

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

    #region IToggleProvider implementation

    void IToggleProvider.Toggle ()
    {
      if (!owner.IsEnabled)
        throw new ElementNotEnabledException ();

      bool? isChecked = owner.IsChecked;
      if (isChecked == true)
        owner.IsChecked = owner.IsThreeState ? null : ((bool?) false);
      else
        owner.IsChecked = (bool?) isChecked.HasValue;
    }

    ToggleState IToggleProvider.ToggleState {
      get { return ToggleState; }
    }

    #endregion

    internal virtual void RaiseToggleStateChanged ()
    {
      RaisePropertyChangedEvent (TogglePatternIdentifiers.ToggleStateProperty,
                                 toggleState,
               ToggleState);
      toggleState = ToggleState;
    }

    private ToggleState ToggleState {
      get {
        bool? isChecked = owner.IsChecked;
        if (isChecked.HasValue)
          return (isChecked == true) ? ToggleState.On : ToggleState.Off;
        return ToggleState.Indeterminate;
      }
    }

    private ToggleButton owner;
    private ToggleState toggleState;
  }
}