Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Automation / EventMap.cs / 1606164 / EventMap.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description:
// Accessibility event map classes are used to determine if, and how many
// listeners there are for events and property changes.
//
// History:
// 07/23/2003 : BrendanM Ported to WCP
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using System.Windows;
using System.Windows.Automation;
using System.Windows.Automation.Peers;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.Automation
{
// Manages the event map that is used to determine if there are Automation
// clients interested in specific events.
internal static class EventMap
{
private class EventInfo
{
internal EventInfo()
{
NumberOfListeners = 1;
}
internal int NumberOfListeners;
}
// Never inline, as we don't want to unnecessarily link the automation DLL.
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
private static bool IsKnownEvent(int id)
{
if ( id == AutomationElementIdentifiers.ToolTipOpenedEvent.Id
|| id == AutomationElementIdentifiers.ToolTipClosedEvent.Id
|| id == AutomationElementIdentifiers.MenuOpenedEvent.Id
|| id == AutomationElementIdentifiers.MenuClosedEvent.Id
|| id == AutomationElementIdentifiers.AutomationFocusChangedEvent.Id
|| id == InvokePatternIdentifiers.InvokedEvent.Id
|| id == SelectionItemPatternIdentifiers.ElementAddedToSelectionEvent.Id
|| id == SelectionItemPatternIdentifiers.ElementRemovedFromSelectionEvent.Id
|| id == SelectionItemPatternIdentifiers.ElementSelectedEvent.Id
|| id == SelectionPatternIdentifiers.InvalidatedEvent.Id
|| id == TextPatternIdentifiers.TextSelectionChangedEvent.Id
|| id == TextPatternIdentifiers.TextChangedEvent.Id
|| id == AutomationElementIdentifiers.AsyncContentLoadedEvent.Id
|| id == AutomationElementIdentifiers.AutomationPropertyChangedEvent.Id
|| id == AutomationElementIdentifiers.StructureChangedEvent.Id
|| ((SynchronizedInputPatternIdentifiers.InputReachedTargetEvent != null) && (id == SynchronizedInputPatternIdentifiers.InputReachedTargetEvent.Id))
|| ((SynchronizedInputPatternIdentifiers.InputReachedOtherElementEvent != null) && (id == SynchronizedInputPatternIdentifiers.InputReachedOtherElementEvent.Id))
|| ((SynchronizedInputPatternIdentifiers.InputDiscardedEvent != null) && (id == SynchronizedInputPatternIdentifiers.InputDiscardedEvent.Id)))
{
return true;
}
return false;
}
// Never inline, as we don't want to unnecessarily link the automation DLL.
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
private static AutomationEvent GetRegisteredEventObjectHelper(AutomationEvents eventId)
{
AutomationEvent eventObject = null;
switch(eventId)
{
case AutomationEvents.ToolTipOpened: eventObject = AutomationElementIdentifiers.ToolTipOpenedEvent; break;
case AutomationEvents.ToolTipClosed: eventObject = AutomationElementIdentifiers.ToolTipClosedEvent; break;
case AutomationEvents.MenuOpened: eventObject = AutomationElementIdentifiers.MenuOpenedEvent; break;
case AutomationEvents.MenuClosed: eventObject = AutomationElementIdentifiers.MenuClosedEvent; break;
case AutomationEvents.AutomationFocusChanged: eventObject = AutomationElementIdentifiers.AutomationFocusChangedEvent; break;
case AutomationEvents.InvokePatternOnInvoked: eventObject = InvokePatternIdentifiers.InvokedEvent; break;
case AutomationEvents.SelectionItemPatternOnElementAddedToSelection: eventObject = SelectionItemPatternIdentifiers.ElementAddedToSelectionEvent; break;
case AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection: eventObject = SelectionItemPatternIdentifiers.ElementRemovedFromSelectionEvent; break;
case AutomationEvents.SelectionItemPatternOnElementSelected: eventObject = SelectionItemPatternIdentifiers.ElementSelectedEvent; break;
case AutomationEvents.SelectionPatternOnInvalidated: eventObject = SelectionPatternIdentifiers.InvalidatedEvent; break;
case AutomationEvents.TextPatternOnTextSelectionChanged: eventObject = TextPatternIdentifiers.TextSelectionChangedEvent; break;
case AutomationEvents.TextPatternOnTextChanged: eventObject = TextPatternIdentifiers.TextChangedEvent; break;
case AutomationEvents.AsyncContentLoaded: eventObject = AutomationElementIdentifiers.AsyncContentLoadedEvent; break;
case AutomationEvents.PropertyChanged: eventObject = AutomationElementIdentifiers.AutomationPropertyChangedEvent; break;
case AutomationEvents.StructureChanged: eventObject = AutomationElementIdentifiers.StructureChangedEvent; break;
case AutomationEvents.InputReachedTarget: eventObject = SynchronizedInputPatternIdentifiers.InputReachedTargetEvent; break;
case AutomationEvents.InputReachedOtherElement: eventObject = SynchronizedInputPatternIdentifiers.InputReachedOtherElementEvent; break;
case AutomationEvents.InputDiscarded: eventObject = SynchronizedInputPatternIdentifiers.InputDiscardedEvent; break;
default:
throw new ArgumentException(SR.Get(SRID.Automation_InvalidEventId), "eventId");
}
if ((eventObject != null) && (!_eventsTable.ContainsKey(eventObject.Id)))
{
eventObject = null;
}
return (eventObject);
}
internal static void AddEvent(int idEvent)
{
lock (_lock)
{
if (_eventsTable == null)
_eventsTable = new Hashtable(20, .1f);
if (_eventsTable.ContainsKey(idEvent))
{
EventInfo info = (EventInfo)_eventsTable[idEvent];
info.NumberOfListeners++;
}
// to avoid unbound memory allocations,
// register only events that we recognize
else if (IsKnownEvent(idEvent))
{
_eventsTable[idEvent] = new EventInfo();
}
}
}
internal static void RemoveEvent(int idEvent)
{
lock (_lock)
{
if (_eventsTable != null)
{
// Decrement the count of listeners for this event
if (_eventsTable.ContainsKey(idEvent))
{
EventInfo info = (EventInfo)_eventsTable[idEvent];
// Update or remove the entry based on remaining listeners
info.NumberOfListeners--;
if (info.NumberOfListeners <= 0)
{
_eventsTable.Remove(idEvent);
// If no more entries exist kill the table
if (_eventsTable.Count == 0)
{
_eventsTable = null;
}
}
}
}
}
}
// Unlike GetRegisteredEvent below,
// HasRegisteredEvent does NOT cause automation DLLs loading
internal static bool HasRegisteredEvent(AutomationEvents eventId)
{
lock (_lock)
{
if (_eventsTable != null && _eventsTable.Count != 0)
{
return (GetRegisteredEventObjectHelper(eventId) != null);
}
}
return (false);
}
internal static AutomationEvent GetRegisteredEvent(AutomationEvents eventId)
{
lock (_lock)
{
if (_eventsTable != null && _eventsTable.Count != 0)
{
return (GetRegisteredEventObjectHelper(eventId));
}
}
return (null);
}
private static Hashtable _eventsTable; // key=event id, data=listener count
private readonly static object _lock = new object();
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description:
// Accessibility event map classes are used to determine if, and how many
// listeners there are for events and property changes.
//
// History:
// 07/23/2003 : BrendanM Ported to WCP
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using System.Windows;
using System.Windows.Automation;
using System.Windows.Automation.Peers;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.Automation
{
// Manages the event map that is used to determine if there are Automation
// clients interested in specific events.
internal static class EventMap
{
private class EventInfo
{
internal EventInfo()
{
NumberOfListeners = 1;
}
internal int NumberOfListeners;
}
// Never inline, as we don't want to unnecessarily link the automation DLL.
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
private static bool IsKnownEvent(int id)
{
if ( id == AutomationElementIdentifiers.ToolTipOpenedEvent.Id
|| id == AutomationElementIdentifiers.ToolTipClosedEvent.Id
|| id == AutomationElementIdentifiers.MenuOpenedEvent.Id
|| id == AutomationElementIdentifiers.MenuClosedEvent.Id
|| id == AutomationElementIdentifiers.AutomationFocusChangedEvent.Id
|| id == InvokePatternIdentifiers.InvokedEvent.Id
|| id == SelectionItemPatternIdentifiers.ElementAddedToSelectionEvent.Id
|| id == SelectionItemPatternIdentifiers.ElementRemovedFromSelectionEvent.Id
|| id == SelectionItemPatternIdentifiers.ElementSelectedEvent.Id
|| id == SelectionPatternIdentifiers.InvalidatedEvent.Id
|| id == TextPatternIdentifiers.TextSelectionChangedEvent.Id
|| id == TextPatternIdentifiers.TextChangedEvent.Id
|| id == AutomationElementIdentifiers.AsyncContentLoadedEvent.Id
|| id == AutomationElementIdentifiers.AutomationPropertyChangedEvent.Id
|| id == AutomationElementIdentifiers.StructureChangedEvent.Id
|| ((SynchronizedInputPatternIdentifiers.InputReachedTargetEvent != null) && (id == SynchronizedInputPatternIdentifiers.InputReachedTargetEvent.Id))
|| ((SynchronizedInputPatternIdentifiers.InputReachedOtherElementEvent != null) && (id == SynchronizedInputPatternIdentifiers.InputReachedOtherElementEvent.Id))
|| ((SynchronizedInputPatternIdentifiers.InputDiscardedEvent != null) && (id == SynchronizedInputPatternIdentifiers.InputDiscardedEvent.Id)))
{
return true;
}
return false;
}
// Never inline, as we don't want to unnecessarily link the automation DLL.
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
private static AutomationEvent GetRegisteredEventObjectHelper(AutomationEvents eventId)
{
AutomationEvent eventObject = null;
switch(eventId)
{
case AutomationEvents.ToolTipOpened: eventObject = AutomationElementIdentifiers.ToolTipOpenedEvent; break;
case AutomationEvents.ToolTipClosed: eventObject = AutomationElementIdentifiers.ToolTipClosedEvent; break;
case AutomationEvents.MenuOpened: eventObject = AutomationElementIdentifiers.MenuOpenedEvent; break;
case AutomationEvents.MenuClosed: eventObject = AutomationElementIdentifiers.MenuClosedEvent; break;
case AutomationEvents.AutomationFocusChanged: eventObject = AutomationElementIdentifiers.AutomationFocusChangedEvent; break;
case AutomationEvents.InvokePatternOnInvoked: eventObject = InvokePatternIdentifiers.InvokedEvent; break;
case AutomationEvents.SelectionItemPatternOnElementAddedToSelection: eventObject = SelectionItemPatternIdentifiers.ElementAddedToSelectionEvent; break;
case AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection: eventObject = SelectionItemPatternIdentifiers.ElementRemovedFromSelectionEvent; break;
case AutomationEvents.SelectionItemPatternOnElementSelected: eventObject = SelectionItemPatternIdentifiers.ElementSelectedEvent; break;
case AutomationEvents.SelectionPatternOnInvalidated: eventObject = SelectionPatternIdentifiers.InvalidatedEvent; break;
case AutomationEvents.TextPatternOnTextSelectionChanged: eventObject = TextPatternIdentifiers.TextSelectionChangedEvent; break;
case AutomationEvents.TextPatternOnTextChanged: eventObject = TextPatternIdentifiers.TextChangedEvent; break;
case AutomationEvents.AsyncContentLoaded: eventObject = AutomationElementIdentifiers.AsyncContentLoadedEvent; break;
case AutomationEvents.PropertyChanged: eventObject = AutomationElementIdentifiers.AutomationPropertyChangedEvent; break;
case AutomationEvents.StructureChanged: eventObject = AutomationElementIdentifiers.StructureChangedEvent; break;
case AutomationEvents.InputReachedTarget: eventObject = SynchronizedInputPatternIdentifiers.InputReachedTargetEvent; break;
case AutomationEvents.InputReachedOtherElement: eventObject = SynchronizedInputPatternIdentifiers.InputReachedOtherElementEvent; break;
case AutomationEvents.InputDiscarded: eventObject = SynchronizedInputPatternIdentifiers.InputDiscardedEvent; break;
default:
throw new ArgumentException(SR.Get(SRID.Automation_InvalidEventId), "eventId");
}
if ((eventObject != null) && (!_eventsTable.ContainsKey(eventObject.Id)))
{
eventObject = null;
}
return (eventObject);
}
internal static void AddEvent(int idEvent)
{
lock (_lock)
{
if (_eventsTable == null)
_eventsTable = new Hashtable(20, .1f);
if (_eventsTable.ContainsKey(idEvent))
{
EventInfo info = (EventInfo)_eventsTable[idEvent];
info.NumberOfListeners++;
}
// to avoid unbound memory allocations,
// register only events that we recognize
else if (IsKnownEvent(idEvent))
{
_eventsTable[idEvent] = new EventInfo();
}
}
}
internal static void RemoveEvent(int idEvent)
{
lock (_lock)
{
if (_eventsTable != null)
{
// Decrement the count of listeners for this event
if (_eventsTable.ContainsKey(idEvent))
{
EventInfo info = (EventInfo)_eventsTable[idEvent];
// Update or remove the entry based on remaining listeners
info.NumberOfListeners--;
if (info.NumberOfListeners <= 0)
{
_eventsTable.Remove(idEvent);
// If no more entries exist kill the table
if (_eventsTable.Count == 0)
{
_eventsTable = null;
}
}
}
}
}
}
// Unlike GetRegisteredEvent below,
// HasRegisteredEvent does NOT cause automation DLLs loading
internal static bool HasRegisteredEvent(AutomationEvents eventId)
{
lock (_lock)
{
if (_eventsTable != null && _eventsTable.Count != 0)
{
return (GetRegisteredEventObjectHelper(eventId) != null);
}
}
return (false);
}
internal static AutomationEvent GetRegisteredEvent(AutomationEvents eventId)
{
lock (_lock)
{
if (_eventsTable != null && _eventsTable.Count != 0)
{
return (GetRegisteredEventObjectHelper(eventId));
}
}
return (null);
}
private static Hashtable _eventsTable; // key=event id, data=listener count
private readonly static object _lock = new object();
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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