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//---------------------------------------------------------------------------
//
// <copyright file=MoveSizeWinEventHandler.cs company=Microsoft>
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
//
// Description: MoveSizeWinEventHandler implementation.
//
// History:
// 02/04/2005 : yutakas - created.
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using MS.Win32;
using MS.Internal;
namespace System.Windows.Documents
{
internal class MoveSizeWinEventHandler : WinEventHandler
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
// ctor that takes a range of events
internal MoveSizeWinEventHandler() : base(NativeMethods.EVENT_SYSTEM_MOVESIZEEND,
NativeMethods.EVENT_SYSTEM_MOVESIZEEND)
{
}
#endregion Constructors
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
// Register text store that will receive move/sice event.
internal void RegisterTextStore(TextStore textstore)
{
if (_arTextStore == null)
{
_arTextStore = new ArrayList(1);
}
_arTextStore.Add(textstore);
}
// Unregister text store.
internal void UnregisterTextStore(TextStore textstore)
{
_arTextStore.Remove(textstore);
}
// The callback from WinEvent.
/// <SecurityNote>
/// Critical - as this invokes Critical method CriticalSourceHwnd
/// TreatAsSafe - as this doesn't expose this information but just calls OnLayoutUpdated on the TextStore.
/// </SecurityNote>
[SecurityCritical, SecurityTreatAsSafe]
internal override void WinEventProc(int eventId, IntPtr hwnd)
{
Invariant.Assert(eventId == NativeMethods.EVENT_SYSTEM_MOVESIZEEND);
if (_arTextStore != null)
{
for (int i = 0; i < _arTextStore.Count; i++)
{
bool notified = false;
TextStore textstore = (TextStore)_arTextStore[i];
IntPtr hwndTemp = textstore.CriticalSourceWnd;
while (hwndTemp != IntPtr.Zero)
{
if (hwnd == hwndTemp)
{
// Only when the parent window of the source of this TextStore is
// moved or resized, we notfiy to Cicero.
textstore.OnLayoutUpdated();
notified = true;
break;
}
hwndTemp = UnsafeNativeMethods.GetParent(new HandleRef(this, hwndTemp));
}
if (!notified)
textstore.MakeLayoutChangeOnGotFocus();
}
}
}
#endregion Internal Methods
//------------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
// Number of TextStores listening to this event.
internal int TextStoreCount
{
get
{
return _arTextStore.Count;
}
}
#endregion Internal Properties
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// list of the registered TextStores.
private ArrayList _arTextStore;
#endregion Private Fields
}
}
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