Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / InterOp / HwndSourceKeyboardInputSite.cs / 1407647 / HwndSourceKeyboardInputSite.cs
using System; using System.Windows.Input; using System.Collections; using MS.Win32; using System.Windows.Media; using System.Windows.Threading; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; using System.Security ; using MS.Internal.PresentationCore; namespace System.Windows.Interop { internal class HwndSourceKeyboardInputSite : IKeyboardInputSite { ////// Critical: satisfies a LinkDemand for 'UIPermissionAttribute' on method /// 'System.Windows.Interop.IKeyboardInputSink.set_KeyboardInputSite(System.Windows.Interop.IKeyboardInputSite)'. /// [SecurityCritical] public HwndSourceKeyboardInputSite(HwndSource source, IKeyboardInputSink sink) { if(source == null) { throw new ArgumentNullException("source"); } if(sink == null) { throw new ArgumentNullException("sink"); } if(!(sink is UIElement)) { throw new ArgumentException(SR.Get(SRID.KeyboardSinkMustBeAnElement), "sink"); } _source = source; _sink = sink; _sink.KeyboardInputSite = this; _sinkElement = sink as UIElement; } #region IKeyboardInputSite ////// Unregisters a child KeyboardInputSink from this sink. /// ////// Requires unmanaged code permission. /// ////// Critical - calls CriticalUnregister. /// TreatAsSafe: - Interface declaration demands unrestricted UI permission /// [ SecurityCritical,SecurityTreatAsSafe ] void IKeyboardInputSite.Unregister() { CriticalUnregister(); } ////// Unregisters a child KeyboardInputSink from this sink. /// ////// Critical - calls CriticalUnregisterKeyboardInputSink /// [ SecurityCritical ] internal void CriticalUnregister() { if(_source != null && _sink != null) { _source.CriticalUnregisterKeyboardInputSink(this); _sink.KeyboardInputSite = null; } _source = null; _sink = null; } ////// Returns the sink associated with this site (the "child", not /// the "parent" sink that owns the site). There's no way of /// getting from the site to the parent sink. /// IKeyboardInputSink IKeyboardInputSite.Sink { get { return _sink; } } ////// Components call this when they want to move focus ("tab") but /// have nowhere further to tab within their own component. Return /// value is true if the site moved focus, false if the calling /// component still has focus and should wrap around. /// bool IKeyboardInputSite.OnNoMoreTabStops(TraversalRequest request) { bool traversed = false; if(_sinkElement != null) { traversed = _sinkElement.MoveFocus(request); } return traversed; } #endregion IKeyboardInputSite private HwndSource _source; private IKeyboardInputSink _sink; private UIElement _sinkElement; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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