Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / DefaultTextStore.cs / 1407647 / DefaultTextStore.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: the default text store that allows default TSF enabling. // // History: // 11/17/2003 : yutakas // //--------------------------------------------------------------------------- using System; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Threading; using System.Threading; using System.Diagnostics; using System.Security; using MS.Internal; using MS.Internal.PresentationCore; // SecurityHelper using System.Security.Permissions; using MS.Win32; namespace System.Windows.Input { // This class has the default text store implementation. // DefaultTextStore is a TextStore to be shared by any element of the Dispatcher. // When the keyboard focus is on the element, Cicero input goes into this by default. // This DefaultTextStore will be used unless an Element (such as TextBox) set // the focus on the document manager for its own TextStore. internal class DefaultTextStore : UnsafeNativeMethods.ITfContextOwner, UnsafeNativeMethods.ITfContextOwnerCompositionSink, UnsafeNativeMethods.ITfTransitoryExtensionSink { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates a DefaultTextStore instance. internal DefaultTextStore(Dispatcher dispatcher) { // Save the target Dispatcher. _dispatcher = dispatcher; _editCookie = UnsafeNativeMethods.TF_INVALID_COOKIE; _transitoryExtensionSinkCookie = UnsafeNativeMethods.TF_INVALID_COOKIE; } #endregion Constructors //------------------------------------------------------ // // Public Methods - ITfContextOwner // //----------------------------------------------------- #region ITfContextOwner // // ITfContextOwner implementation for Cicero's default text store. // public void GetACPFromPoint(ref UnsafeNativeMethods.POINT point, UnsafeNativeMethods.GetPositionFromPointFlags flags, out int position) { position = 0; } public void GetTextExt(int start, int end, out UnsafeNativeMethods.RECT rect, out bool clipped) { rect = new UnsafeNativeMethods.RECT(); clipped = false; } public void GetScreenExt(out UnsafeNativeMethods.RECT rect) { rect = new UnsafeNativeMethods.RECT(); } public void GetStatus(out UnsafeNativeMethods.TS_STATUS status) { status = new UnsafeNativeMethods.TS_STATUS(); } public void GetWnd(out IntPtr hwnd) { hwnd = IntPtr.Zero; } public void GetValue(ref Guid guidAttribute, out object varValue) { varValue = null; } #endregion ITfContextOwner //------------------------------------------------------ // // Public Methods - ITfContextOwnerCompositionSink // //------------------------------------------------------ #region ITfContextOwnerCompositionSink ////// Critical - UnsafeNativeMethods.ITfCompositionView is a critical type. /// Safe - The method does nothing with the critical Input parameter. /// [SecuritySafeCritical] public void OnStartComposition(UnsafeNativeMethods.ITfCompositionView view, out bool ok) { // Return true in ok to start the composition. ok = true; } ////// Critical - UnsafeNativeMethods.ITfCompositionView & UnsafeNativeMethods.ITfRange are critical types. /// Safe - The method does nothing. /// [SecuritySafeCritical] public void OnUpdateComposition(UnsafeNativeMethods.ITfCompositionView view, UnsafeNativeMethods.ITfRange rangeNew) { } ////// Critical - UnsafeNativeMethods.ITfCompositionView is a critical type. /// Safe - The method does nothing. /// [SecuritySafeCritical] public void OnEndComposition(UnsafeNativeMethods.ITfCompositionView view) { } #endregion ITfContextOwnerCompositionSink //----------------------------------------------------- // // Public Methods - ITfTransitoryExtensionSink // //------------------------------------------------------ #region ITfTransitoryExtensionSink // Transitory Document has been updated. // This is the notification of the changes of the result string and the composition string. ////// Critical: This code acceses critical data in the form of TextCompositionManager /// TreatAsSafe: There exists a demand for unmanaged code. /// [SecurityCritical,SecurityTreatAsSafe] public void OnTransitoryExtensionUpdated(UnsafeNativeMethods.ITfContext context, int ecReadOnly, UnsafeNativeMethods.ITfRange rangeResult, UnsafeNativeMethods.ITfRange rangeComposition, out bool fDeleteResultRange) { SecurityHelper.DemandUnmanagedCode(); fDeleteResultRange = true; TextCompositionManager compmgr = InputManager.Current.PrimaryKeyboardDevice.TextCompositionManager; if (rangeResult != null) { string result = StringFromITfRange(rangeResult, ecReadOnly); if (result.Length > 0) { if (_composition == null) { // We don't have the composition now and we got the result string. // The result text is result and automatic termination is true. _composition = new DefaultTextStoreTextComposition(InputManager.Current, Keyboard.FocusedElement, result, TextCompositionAutoComplete.On); TextCompositionManager.StartComposition(_composition); // relese composition. _composition = null; } else { // Finalize the composition. _composition.SetCompositionText(""); _composition.SetText(result); // We don't call _composition.Complete() here. We just want to generate // TextInput events. TextCompositionManager.CompleteComposition(_composition); // relese composition. _composition = null; } } } if (rangeComposition != null) { string comp = StringFromITfRange(rangeComposition, ecReadOnly); if (comp.Length > 0) { if (_composition == null) { // Start the new composition. _composition = new DefaultTextStoreTextComposition(InputManager.Current, Keyboard.FocusedElement, "", TextCompositionAutoComplete.Off); _composition.SetCompositionText(comp); TextCompositionManager.StartComposition(_composition); } else { // Update the current composition. _composition.SetCompositionText(comp); _composition.SetText(""); TextCompositionManager.UpdateComposition(_composition); } } } } #endregion ITfTransitoryExtensionSink //----------------------------------------------------- // // Public Properties // //----------------------------------------------------- //----------------------------------------------------- // // Public Events // //------------------------------------------------------ //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- // Return the text services host associated with the current Dispatcher. internal static DefaultTextStore Current { get { // DefaultTextStore is per Dispatcher and the cached referrence is stored in InputMethod class. DefaultTextStore defaulttextstore = InputMethod.Current.DefaultTextStore; if(defaulttextstore == null) { defaulttextstore = new DefaultTextStore(Dispatcher.CurrentDispatcher); InputMethod.Current.DefaultTextStore = defaulttextstore; defaulttextstore.Register(); } return defaulttextstore; } } //------------------------------------------------------ // // Internal Properties // //----------------------------------------------------- // Pointer to ITfDocumentMgr interface. ////// Critical: This exposes ITfDocumentMgr that has methods with SuppressUnmanagedCodeSecurity. /// internal UnsafeNativeMethods.ITfDocumentMgr DocumentManager { [SecurityCritical] get { return _doc.Value;} set { _doc = new SecurityCriticalData(value); } } // EditCookie for ITfContext. internal int EditCookie { // get { return _editCookie; } set { _editCookie = value; } } internal int TransitoryExtensionSinkCookie { get { return _transitoryExtensionSinkCookie; } set { _transitoryExtensionSinkCookie = value; } } // // Get Transitory's DocumentMgr from GUID_COMPARTMENT_TRANSITORYEXTENSION_DOCUMENTMANAGER. // /// /// Critical: This code acceses ITfDocumentMgr, ItfCompartment and ITfCompartmentMgr /// TreatAsSafe: There exists a demand for unmanaged code /// internal UnsafeNativeMethods.ITfDocumentMgr TransitoryDocumentManager { [SecurityCritical,SecurityTreatAsSafe] get { SecurityHelper.DemandUnmanagedCode(); UnsafeNativeMethods.ITfDocumentMgr doc; UnsafeNativeMethods.ITfCompartmentMgr compartmentMgr; UnsafeNativeMethods.ITfCompartment compartment; // get compartment manager of the parent doc. compartmentMgr = (UnsafeNativeMethods.ITfCompartmentMgr)DocumentManager; // get compartment. Guid guid = UnsafeNativeMethods.GUID_COMPARTMENT_TRANSITORYEXTENSION_DOCUMENTMANAGER; compartmentMgr.GetCompartment(ref guid, out compartment); // get value of the compartment. object obj; compartment.GetValue(out obj); doc = obj as UnsafeNativeMethods.ITfDocumentMgr; Marshal.ReleaseComObject(compartment); return doc; } } //----------------------------------------------------- // // Internal Events // //----------------------------------------------------- //------------------------------------------------------ // // Private Methods // //----------------------------------------------------- // get the text from ITfRange. ////// Critical - calls unmanaged code (GetExtent) /// [SecurityCritical] private string StringFromITfRange(UnsafeNativeMethods.ITfRange range, int ecReadOnly) { // Transitory Document uses ther TextStore, which is ACP base. UnsafeNativeMethods.ITfRangeACP rangeacp = (UnsafeNativeMethods.ITfRangeACP)range; int start; int count; int countRet; rangeacp.GetExtent(out start, out count); char[] text = new char[count]; rangeacp.GetText(ecReadOnly, 0, text, count, out countRet); return new string(text); } // This function calls TextServicesContext to create TSF document and start transitory extension. ////// Critical - directly access the text store /// TreatAsSafe - registers "this" as a text store (safe operation) /// [SecurityCritical, SecurityTreatAsSafe] private void Register() { // Create TSF document and advise the sink to it. TextServicesContext.DispatcherCurrent.RegisterTextStore(this); } //------------------------------------------------------ // // Private Properties // //------------------------------------------------------ //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ // Dispatcher for this text store private readonly Dispatcher _dispatcher; // The current active composition. private TextComposition _composition; // The TSF document object. This is a native resource. ////// Critical: UnsafeNativeMethods.ITfDocumentMgr has methods with SuppressUnmanagedCodeSecurity. /// private SecurityCriticalData_doc; // The edit cookie TSF returns from CreateContext. private int _editCookie; // The transitory extension sink cookie. private int _transitoryExtensionSinkCookie; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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