Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / FrameworkTextComposition.cs / 3 / FrameworkTextComposition.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: the TextComposition class // // History: // 11/18/2003 : [....] created // //--------------------------------------------------------------------------- using MS.Internal; using MS.Win32; using System; using System.Diagnostics; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Input; using System.Security; using System.Security.Permissions; namespace System.Windows.Documents { ////// the internal Composition class provides input-text/composition event promotion /// This class is used for simple TextBox control that does not expose TextRange. /// public class FrameworkTextComposition: TextComposition { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // // Constructor for TextStore's TextComposition. // internal FrameworkTextComposition(InputManager inputManager, IInputElement source, object owner) : base(inputManager, source, String.Empty, TextCompositionAutoComplete.Off) { _owner = owner; } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- //------------------------------------------------------ // // Public Interface Methods // //------------------------------------------------------ ////// Finalize the composition. /// This does not call base.Complete() because TextComposition.Complete() /// will call TextServicesManager.CompleteComposition() directly to generate TextCompositionEvent. /// We finalize Cicero's composition and TextStore will automatically /// generate the proper TextComposition events. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This method is critical only because its base class method is critical. /// PublicOK: This just changes the state of the composition string from undetermined to determined. /// And of course, this does not expose any critical data. /// Protected by link demand to match base class. /// [SecurityCritical] [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] public override void Complete() { _pendingComplete = true; } //----------------------------------------------------- // // Public Properties // //------------------------------------------------------ ////// Offset of the finalized composition text. /// ////// This property is only meaningful during the handling of a /// TextInput event. During a TextInputStart or TextInputUpdate event, /// this property has a value of -1. /// /// When read in the context of TextBox, the offset refers to unicode /// code points. When read in the context of a RichTextBox, the offset /// refers to FlowDocument symbols (unicode code points, TextElement edges, /// or embedded UIElements). /// public int ResultOffset { get { return (_ResultStart == null) ? -1 : _offset; } } ////// Length of the current composition in unicode code points. /// ////// This property is only meaningful during the handling of a /// TextInput event. During a TextInputStart or TextInputUpdate event, /// this property has a value of -1. /// public int ResultLength { get { return (_ResultStart == null) ? -1 : _length; } } ////// Offset of the composition text. /// ////// This property is only meaningful during the handling of a /// TextInputStart or TextInputUpdate event. During a TextInput event, /// this property has a value of -1. /// /// When read in the context of TextBox, the offset refers to unicode /// code points. When read in the context of a RichTextBox, the offset /// refers to FlowDocument symbols (unicode code points, TextElement edges, /// or embedded UIElements). /// public int CompositionOffset { get { return (_CompositionStart == null) ? -1 : _offset; } } ////// Length of the current composition in unicode code points. /// ////// This property is only meaningful during the handling of a /// TextInputStart or TextInputUpdate event. During a TextInput event, /// this property has a value of -1. /// public int CompositionLength { get { return (_CompositionStart == null) ? -1 : _length; } } //----------------------------------------------------- // // Internal Methods // //----------------------------------------------------- ////// Critical: This calls critical COM interop. /// [SecurityCritical] internal static void CompleteCurrentComposition(UnsafeNativeMethods.ITfDocumentMgr documentMgr) { UnsafeNativeMethods.ITfContext context; documentMgr.GetBase(out context); UnsafeNativeMethods.ITfCompositionView composition = GetComposition(context); if (composition != null) { UnsafeNativeMethods.ITfContextOwnerCompositionServices compositionService = context as UnsafeNativeMethods.ITfContextOwnerCompositionServices; // Terminate composition if there is a composition view. compositionService.TerminateComposition(composition); Marshal.ReleaseComObject(composition); } Marshal.ReleaseComObject(context); } ////// Critical: This calls critical COM interop. /// [SecurityCritical] internal static UnsafeNativeMethods.ITfCompositionView GetCurrentCompositionView(UnsafeNativeMethods.ITfDocumentMgr documentMgr) { UnsafeNativeMethods.ITfContext context; documentMgr.GetBase(out context); UnsafeNativeMethods.ITfCompositionView view = GetComposition(context); Marshal.ReleaseComObject(context); return view; } // Set result string to TextComposition. internal void SetResultPositions(ITextPointer start, ITextPointer end, string text) { Invariant.Assert(start != null); Invariant.Assert(end != null); Invariant.Assert(text != null); _compositionStart = null; _compositionEnd = null; // We need to have another instances of TextPointer since we don't want to // freeze original TextPointers. _resultStart = start.GetFrozenPointer(LogicalDirection.Backward); _resultEnd = end.GetFrozenPointer(LogicalDirection.Forward); this.Text = text; this.CompositionText = String.Empty; // We must cache integer offsets -- public listeners won't expect // them to float like TextPointers if the document changes. _offset = (_resultStart == null) ? -1 : _resultStart.Offset; _length = (_resultStart == null) ? -1 : _resultStart.GetOffsetToPosition(_resultEnd); } // Set composition string to TextComposition. internal void SetCompositionPositions(ITextPointer start, ITextPointer end, string text) { Invariant.Assert(start != null); Invariant.Assert(end != null); Invariant.Assert(text != null); // We need to have another instances of TextPointer since we don't want to // freeze original TextPointers. _compositionStart = start.GetFrozenPointer(LogicalDirection.Backward); _compositionEnd = end.GetFrozenPointer(LogicalDirection.Forward); _resultStart = null; _resultEnd = null; this.Text = String.Empty; this.CompositionText = text; // We must cache integer offsets -- public listeners won't expect // them to float like TextPointers if the document changes. _offset = (_compositionStart == null) ? -1 : _compositionStart.Offset; _length = (_compositionStart == null) ? -1 : _compositionStart.GetOffsetToPosition(_compositionEnd); } //----------------------------------------------------- // // Internal Properties // //------------------------------------------------------ ////// The result text of the text input. /// internal ITextPointer _ResultStart { get { return _resultStart; } } ////// The result text of the text input. /// internal ITextPointer _ResultEnd { get { return _resultEnd; } } ////// The current composition text. /// internal ITextPointer _CompositionStart { get { return _compositionStart; } } ////// The current composition text. /// internal ITextPointer _CompositionEnd { get { return _compositionEnd; } } // True if Complete has been called. internal bool PendingComplete { get { return _pendingComplete; } } // TextStore or ImmComposition that created this object. internal object Owner { get { return _owner; } } //----------------------------------------------------- // // Internal Events // //------------------------------------------------------ //------------------------------------------------------ // // Private Methods // //----------------------------------------------------- ////// Get ITfContextView of the context. /// ////// Critical: calls Marshal.ReleaseComObject which LinkDemands /// [SecurityCritical] private static UnsafeNativeMethods.ITfCompositionView GetComposition(UnsafeNativeMethods.ITfContext context) { UnsafeNativeMethods.ITfContextComposition contextComposition; UnsafeNativeMethods.IEnumITfCompositionView enumCompositionView; UnsafeNativeMethods.ITfCompositionView[] compositionViews = new UnsafeNativeMethods.ITfCompositionView[1]; int fetched; contextComposition = (UnsafeNativeMethods.ITfContextComposition)context; contextComposition.EnumCompositions(out enumCompositionView); enumCompositionView.Next(1, compositionViews, out fetched); Marshal.ReleaseComObject(enumCompositionView); return compositionViews[0]; } //------------------------------------------------------ // // Private Fields // //----------------------------------------------------- // the start poisiotn of the result text private ITextPointer _resultStart; // the end poisiotn of the result text private ITextPointer _resultEnd; // the start position of the composition text private ITextPointer _compositionStart; // the end position of the composition text private ITextPointer _compositionEnd; // Composition or result offset. private int _offset; // Composition or result length. private int _length; // TextStore or ImmComposition that created this object. private readonly object _owner; private bool _pendingComplete; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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