Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextServicesDisplayAttributePropertyRanges.cs / 1305600 / TextServicesDisplayAttributePropertyRanges.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: TextServicesDisplayAttributePropertyRanges.cs // // History: // 08/01/2003 : yutakas - Ported from dotnet tree. // //--------------------------------------------------------------------------- using System; using System.Runtime.InteropServices; using System.Windows.Threading; using System.Security; using System.Security.Permissions; using System.Collections; using System.Diagnostics; using System.Windows.Media; using System.Windows.Input; using System.Windows.Documents; using MS.Win32; namespace System.Windows.Documents { //----------------------------------------------------- // // TextServicesDisplayAttributePropertyRanges class // //----------------------------------------------------- ////// The class for readind string property ranges of EditRecord /// internal class TextServicesDisplayAttributePropertyRanges : TextServicesPropertyRanges { //------------------------------------------------------ // // Constructors // //----------------------------------------------------- #region Constructors internal TextServicesDisplayAttributePropertyRanges(TextStore textstore) : base(textstore, UnsafeNativeMethods.GUID_PROP_ATTRIBUTE) { } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ #region Internal Methods ////// Apply attribute for the range and display attribute property. /// ////// Critical - Calls critical method (ConvertToTextPosition) /// TreatAsSafe - all parameters are typesafe and are validated, elevated data (the string) /// is passed from one highly trusted entity to another. /// [SecurityCritical, SecurityTreatAsSafe] internal override void OnRange( UnsafeNativeMethods.ITfProperty property, int ecReadOnly, UnsafeNativeMethods.ITfRange range) { Int32 guidatom = GetInt32Value(ecReadOnly, property, range); if (guidatom != 0) { TextServicesDisplayAttribute attr; attr = GetDisplayAttribute(guidatom); if (attr != null) { ITextPointer start; ITextPointer end; ConvertToTextPosition(range, out start, out end); attr.Apply(start, end); } } } ////// Calback function for TextEditSink /// we track the property change here. /// ////// Critical - commits raw input changes to the system. it elevatest to get context properties. /// [SecurityCritical] internal override void OnEndEdit(UnsafeNativeMethods.ITfContext context, int ecReadOnly, UnsafeNativeMethods.ITfEditRecord editRecord) { Guid displayAttributeGuid; UnsafeNativeMethods.ITfProperty displayAttributeProperty; UnsafeNativeMethods.IEnumTfRanges attributeRangeEnumerator; UnsafeNativeMethods.ITfRange[] attributeRanges; int fetched; int guidAtom; TextServicesDisplayAttribute displayAttribute; ITextPointer start; ITextPointer end; // // Remove any existing display attribute highlights. // #if UNUSED_IME_HIGHLIGHT_LAYER if (_highlightLayer != null) { this.TextStore.TextContainer.Highlights.RemoveLayer(_highlightLayer); _highlightLayer = null; } #endif // // Remove any existing composition adorner for display attribute. // if (_compositionAdorner != null) { _compositionAdorner.Uninitialize(); _compositionAdorner = null; } // // Look for new ones. // // Get the DisplayAttributeProperty. displayAttributeGuid = Guid; context.GetProperty(ref displayAttributeGuid, out displayAttributeProperty); // Get a range enumerator for the property. if (displayAttributeProperty.EnumRanges(ecReadOnly, out attributeRangeEnumerator, null) == NativeMethods.S_OK) { attributeRanges = new UnsafeNativeMethods.ITfRange[1]; // Walk each range. while (attributeRangeEnumerator.Next(1, attributeRanges, out fetched) == NativeMethods.S_OK) { // Get a DisplayAttribute for this range. guidAtom = GetInt32Value(ecReadOnly, displayAttributeProperty, attributeRanges[0]); displayAttribute = GetDisplayAttribute(guidAtom); if (displayAttribute != null && !displayAttribute.IsEmptyAttribute()) { // Set a matching highlight for the attribute range. ConvertToTextPosition(attributeRanges[0], out start, out end); if (start != null) { #if UNUSED_IME_HIGHLIGHT_LAYER // Demand create the highlight layer. if (_highlightLayer == null) { _highlightLayer = new DisplayAttributeHighlightLayer(); } #endif if (_compositionAdorner == null) { _compositionAdorner = new CompositionAdorner(this.TextStore.TextView); _compositionAdorner.Initialize(this.TextStore.TextView); } #if UNUSED_IME_HIGHLIGHT_LAYER // ToDo: Need to pass the foreground and background color of the composition _highlightLayer.Add(start, end, /*TextDecorationCollection:*/null); #endif // Add the attribute range into CompositionAdorner. _compositionAdorner.AddAttributeRange(start, end, displayAttribute); } } Marshal.ReleaseComObject(attributeRanges[0]); } #if UNUSED_IME_HIGHLIGHT_LAYER if (_highlightLayer != null) { this.TextStore.TextContainer.Highlights.AddLayer(_highlightLayer); } #endif if (_compositionAdorner != null) { // Update the layout to get the acurated rectangle from calling GetRectangleFromTextPosition this.TextStore.RenderScope.UpdateLayout(); // Invalidate the composition adorner to render the composition attribute ranges. _compositionAdorner.InvalidateAdorner(); } Marshal.ReleaseComObject(attributeRangeEnumerator); } Marshal.ReleaseComObject(displayAttributeProperty); } // Callback from TextServicesProperty.OnLayoutUpdated. // Updates composition display attribute adorner on-screen location. internal void OnLayoutUpdated() { if (_compositionAdorner != null) { _compositionAdorner.InvalidateAdorner(); } } #endregion Internal Methods //----------------------------------------------------- // // Private Methods // //------------------------------------------------------ #region Private Methods ////// Access DisplayAttributeManager /// ////// Critical - Calls unmanaged code (various TextServicesInterop) /// TreatAsSafe - exposes safe data (display attributes), argument is /// validates through a GUID lookup table. /// [SecurityCritical, SecurityTreatAsSafe] private static TextServicesDisplayAttribute GetDisplayAttribute(Int32 guidatom) { TextServicesDisplayAttribute attr = null; // Demand create the cache. if (_attributes == null) { _attributes = new Hashtable(); } attr = (TextServicesDisplayAttribute)_attributes[guidatom]; if (attr != null) return attr; // // Use category manager to convert guidatom to GUID. // UnsafeNativeMethods.ITfCategoryMgr catmgr; if (UnsafeNativeMethods.TF_CreateCategoryMgr(out catmgr) != NativeMethods.S_OK) return null; if (catmgr == null) return null; Guid guid; catmgr.GetGUID(guidatom, out guid); Marshal.ReleaseComObject(catmgr); // GetGUID could fail and reutrn GUID_NULL. if (guid.Equals(UnsafeNativeMethods.Guid_Null)) return null; // // Use DisplayAttributeMgr to get TF_DISPLAYATTRIBUTE. // UnsafeNativeMethods.ITfDisplayAttributeMgr dam; UnsafeNativeMethods.ITfDisplayAttributeInfo dai; UnsafeNativeMethods.TF_DISPLAYATTRIBUTE tfattr; if (UnsafeNativeMethods.TF_CreateDisplayAttributeMgr(out dam) != NativeMethods.S_OK) return null; if (dam == null) return null; Guid clsid; dam.GetDisplayAttributeInfo(ref guid, out dai, out clsid); if (dai != null) { dai.GetAttributeInfo(out tfattr); attr = new TextServicesDisplayAttribute(tfattr); Marshal.ReleaseComObject(dai); // // cache this into our hashtable. // _attributes[guidatom] = attr; } Marshal.ReleaseComObject(dam); return attr; } ////// Critical - calls critical GetValue method. /// TreatAsSafe - exposes safe data (display attributes). /// [SecurityCritical, SecurityTreatAsSafe] private Int32 GetInt32Value(int ecReadOnly, UnsafeNativeMethods.ITfProperty property, UnsafeNativeMethods.ITfRange range) { Object obj = GetValue(ecReadOnly, property, range); if (obj == null) return 0; return (Int32)obj; } #endregion Private Methods //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields // Attribute cache. // private static Hashtable _attributes; #if UNUSED_IME_HIGHLIGHT_LAYER // Highlights for our display attributes. private DisplayAttributeHighlightLayer _highlightLayer; #endif // CompositionAdorner for displaying the composition attributes. private CompositionAdorner _compositionAdorner; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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