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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.
//
//
//
// Description: Expand Collapse pattern provider wrapper for WCP
//
//
using System;
using System.Windows.Threading;
using System.Windows.Media;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows.Automation.Peers;
namespace MS.Internal.Automation
{
// Automation/WCP Wrapper class: Implements that UIAutomation I...Provider
// interface, and calls through to a WCP AutomationPeer which implements the corresponding
// I...Provider inteface. Marshalls the call from the RPC thread onto the
// target AutomationPeer's context.
//
// Class has two major parts to it:
// * Implementation of the I...Provider, which uses Dispatcher.Invoke
// to call a private method (lives in second half of the class) via a delegate,
// if necessary, packages any params into an object param. Return type of Invoke
// must be cast from object to appropriate type.
// * private methods - one for each interface entry point - which get called back
// on the right context. These call through to the peer that's actually
// implenting the I...Provider version of the interface.
internal class ExpandCollapseProviderWrapper: MarshalByRefObject, IExpandCollapseProvider
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
private ExpandCollapseProviderWrapper( AutomationPeer peer, IExpandCollapseProvider iface )
{
_peer = peer;
_iface = iface;
}
#endregion Constructors
//------------------------------------------------------
//
// Interface IExpandCollapseProvider
//
//------------------------------------------------------
#region Interface IExpandCollapseProvider
public void Expand()
{
ElementUtil.Invoke( _peer, new DispatcherOperationCallback( Expand ), null );
}
public void Collapse()
{
ElementUtil.Invoke( _peer, new DispatcherOperationCallback( Collapse ), null );
}
public ExpandCollapseState ExpandCollapseState
{
get
{
return (ExpandCollapseState) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetExpandCollapseState ), null );
}
}
#endregion Interface IExpandCollapseProvider
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
internal static object Wrap( AutomationPeer peer, object iface )
{
return new ExpandCollapseProviderWrapper( peer, (IExpandCollapseProvider) iface );
}
#endregion Internal Methods
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
private object Expand( object unused )
{
_iface.Expand();
return null;
}
private object Collapse( object unused )
{
_iface.Collapse();
return null;
}
private object GetExpandCollapseState( object unused )
{
return _iface.ExpandCollapseState;
}
#endregion Private Methods
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
private AutomationPeer _peer;
private IExpandCollapseProvider _iface;
#endregion Private Fields
}
}
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