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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: Scroll pattern provider wrapper for WCP
//
//
using System;
using System.Windows.Threading;
using System.Windows;
using System.Windows.Media;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows.Automation.Peers;
using MS.Internal.Automation;
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 ScrollProviderWrapper: MarshalByRefObject, IScrollProvider
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
private ScrollProviderWrapper( AutomationPeer peer, IScrollProvider iface )
{
_peer = peer;
_iface = iface;
}
#endregion Constructors
//------------------------------------------------------
//
// Interface IScrollProvider
//
//------------------------------------------------------
#region Interface IScrollProvider
public void Scroll( ScrollAmount horizontalAmount, ScrollAmount verticalAmount )
{
ElementUtil.Invoke( _peer, new DispatcherOperationCallback( Scroll ), new ScrollAmount [ ] { horizontalAmount, verticalAmount } );
}
public void SetScrollPercent( double horizontalPercent, double verticalPercent )
{
ElementUtil.Invoke( _peer, new DispatcherOperationCallback( SetScrollPercent ), new double [ ] { horizontalPercent, verticalPercent } );
}
public double HorizontalScrollPercent
{
get
{
return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetHorizontalScrollPercent ), null );
}
}
public double VerticalScrollPercent
{
get
{
return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetVerticalScrollPercent ), null );
}
}
public double HorizontalViewSize
{
get
{
return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetHorizontalViewSize ), null );
}
}
public double VerticalViewSize
{
get
{
return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetVerticalViewSize ), null );
}
}
public bool HorizontallyScrollable
{
get
{
return (bool) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetHorizontallyScrollable ), null );
}
}
public bool VerticallyScrollable
{
get
{
return (bool) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetVerticallyScrollable ), null );
}
}
#endregion Interface IScrollProvider
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
internal static object Wrap( AutomationPeer peer, object iface )
{
return new ScrollProviderWrapper( peer, (IScrollProvider) iface );
}
#endregion Internal Methods
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
private object Scroll( object arg )
{
ScrollAmount [ ] args = (ScrollAmount [ ]) arg;
_iface.Scroll( args[ 0 ], args[ 1 ] );
return null;
}
private object SetScrollPercent( object arg )
{
double [ ] args = (double [ ]) arg;
_iface.SetScrollPercent( args[ 0 ], args[ 1 ] );
return null;
}
private object GetHorizontalScrollPercent( object unused )
{
return _iface.HorizontalScrollPercent;
}
private object GetVerticalScrollPercent( object unused )
{
return _iface.VerticalScrollPercent;
}
private object GetHorizontalViewSize( object unused )
{
return _iface.HorizontalViewSize;
}
private object GetVerticalViewSize( object unused )
{
return _iface.VerticalViewSize;
}
private object GetHorizontallyScrollable( object unused )
{
return _iface.HorizontallyScrollable;
}
private object GetVerticallyScrollable( object unused )
{
return _iface.VerticallyScrollable;
}
#endregion Private Methods
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
private AutomationPeer _peer;
private IScrollProvider _iface;
#endregion Private Fields
}
}
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