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//---------------------------------------------------------------------------
//
// <copyright file=TextServicesManager.cs company=Microsoft>
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
//
// Description: Provides input to ImeProcessed promotion -- feeds keystrokes
// to IMEs.
//
// History:
// 07/23/2003 : Microsoft - Created
//
//---------------------------------------------------------------------------
using System.Windows.Threading;
using MS.Internal;
using MS.Win32;
using System;
using System.Security;
using System.Security.Permissions;
namespace System.Windows.Input
{
internal class TextServicesManager : DispatcherObject
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
///<SecurityNote>
/// Critical - Calls a critical method - PreProcessInput
/// TreatAsSafe - Ok for us to register an event handler. Handler itself is critical.
///</SecurityNote>
[SecurityCritical, SecurityTreatAsSafe]
internal TextServicesManager(InputManager inputManager)
{
_inputManager = inputManager;
_inputManager.PreProcessInput += new PreProcessInputEventHandler(PreProcessInput);
_inputManager.PostProcessInput += new ProcessInputEventHandler(PostProcessInput);
}
#endregion Constructors
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
//------------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
//------------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
// Track the focus of KeyboardDevice. KeyboardDevice.ChangeFocus() this.
internal void Focus(DependencyObject focus)
{
if (focus == null)
{
// Don't grab keyboard events from Text Services Framework without keyboard focus.
this.Dispatcher.IsTSFMessagePumpEnabled = false;
return;
}
// Grab keyboard events from Text Services Framework with keyboard focus.
this.Dispatcher.IsTSFMessagePumpEnabled = true;
if ((bool)focus.GetValue(InputMethod.IsInputMethodSuspendedProperty))
{
// The focus is on the element that suspending IME's input (such as menu).
// The document focus should remain.
return;
}
InputMethod.Current.EnableOrDisableInputMethod((bool)focus.GetValue(InputMethod.IsInputMethodEnabledProperty));
}
//------------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
//------------------------------------------------------
//
// Internal Events
//
//------------------------------------------------------
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// Marks interesting KeyDown events as ImeInput.
/// <SecurityNote>
/// Critical - directly pushes keys into the input stack
/// </SecurityNote>
[SecurityCritical]
private void PreProcessInput(object sender, PreProcessInputEventArgs e)
{
TextServicesContext context;
KeyEventArgs keyArgs;
if (!TextServicesLoader.ServicesInstalled)
return;
if(e.StagingItem.Input.RoutedEvent != Keyboard.PreviewKeyDownEvent &&
e.StagingItem.Input.RoutedEvent != Keyboard.PreviewKeyUpEvent)
{
return;
}
// filter SysKey
if (IsSysKeyDown())
return;
// IMM32-IME handles the key event and we don't do anything.
if (InputMethod.IsImm32ImeCurrent())
return;
DependencyObject element = Keyboard.FocusedElement as DependencyObject;
if ((element == null) || (bool)element.GetValue(InputMethod.IsInputMethodSuspendedProperty))
{
// The focus is on the element that suspending IME's input (such as menu).
// we don't do anything.
return;
}
keyArgs = (KeyEventArgs)e.StagingItem.Input;
if(!keyArgs.Handled)
{
context = TextServicesContext.DispatcherCurrent;
if (context != null)
{
if (TextServicesKeystroke(context, keyArgs, true /* test */))
{
keyArgs.MarkImeProcessed();
}
}
}
}
/// <SecurityNote>
/// Critical - directly pushes keys into the input stack
/// </SecurityNote>
[SecurityCritical]
private void PostProcessInput(object sender, ProcessInputEventArgs e)
{
TextServicesContext context;
KeyEventArgs keyArgs;
if (!TextServicesLoader.ServicesInstalled)
return;
// IMM32-IME handles the key event and we don't do anything.
if (InputMethod.IsImm32ImeCurrent())
return;
DependencyObject element = Keyboard.FocusedElement as DependencyObject;
if ((element == null) || (bool)element.GetValue(InputMethod.IsInputMethodSuspendedProperty))
{
// The focus is on the element that suspending IME's input (such as menu).
// we don't do anything.
return;
}
if(e.StagingItem.Input.RoutedEvent == Keyboard.PreviewKeyDownEvent ||
e.StagingItem.Input.RoutedEvent == Keyboard.PreviewKeyUpEvent)
{
// filter SysKey
if (IsSysKeyDown())
return;
keyArgs = (KeyEventArgs)e.StagingItem.Input;
if(!keyArgs.Handled && keyArgs.Key == Key.ImeProcessed)
{
context = TextServicesContext.DispatcherCurrent;
if (context != null)
{
if (TextServicesKeystroke(context, keyArgs, false /* test */))
{
keyArgs.Handled = true;
}
}
}
}
else if(e.StagingItem.Input.RoutedEvent == Keyboard.KeyDownEvent ||
e.StagingItem.Input.RoutedEvent == Keyboard.KeyUpEvent)
{
keyArgs = (KeyEventArgs)e.StagingItem.Input;
if(!keyArgs.Handled && keyArgs.Key == Key.ImeProcessed)
{
keyArgs.Handled = true;
}
}
}
/// <SecurityNote>
/// Critical - directly pushes keys into the input stack
/// </SecurityNote>
[SecurityCritical]
private bool TextServicesKeystroke(TextServicesContext context, KeyEventArgs keyArgs, bool test)
{
TextServicesContext.KeyOp keyop;
int wParam;
int lParam;
int scancode;
// Cicero's Keystroke Manager and TIP does not recognize VK_RSHIFT or VK_LSHIFT.
// We need to pass VK_SHIFT and the proper scancode.
//
switch (keyArgs.RealKey)
{
case Key.RightShift:
wParam = NativeMethods.VK_SHIFT;
scancode = 0x36;
break;
case Key.LeftShift:
wParam = NativeMethods.VK_SHIFT;
scancode = 0x2A;
break;
default:
wParam = KeyInterop.VirtualKeyFromKey(keyArgs.RealKey);
scancode = 0;
break;
}
lParam = (int)(((uint)scancode << 16) | 1);
if (keyArgs.RoutedEvent == Keyboard.PreviewKeyDownEvent/*keyArgs.IsDown*/)
{
keyop = test ? TextServicesContext.KeyOp.TestDown : TextServicesContext.KeyOp.Down;
}
else
{
// Previous key state and transition state always 1 for WM_KEYUP.
lParam |= (1 << 31) | (1 << 30);
keyop = test ? TextServicesContext.KeyOp.TestUp : TextServicesContext.KeyOp.Up;
}
return context.Keystroke(wParam, lParam, keyop);
}
private bool IsSysKeyDown()
{
if (Keyboard.IsKeyDown(Key.LeftAlt) ||
Keyboard.IsKeyDown(Key.RightAlt) ||
Keyboard.IsKeyDown(Key.F10))
return true;
return false;
}
#endregion Private methods
//------------------------------------------------------
//
// Private Properties
//
//------------------------------------------------------
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
///<SecurityNote>
/// Critical - required elevations to create.
///</SecurityNote>
[SecurityCritical]
private readonly InputManager _inputManager;
#endregion Private Fields
}
}
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