TextViewSelectionProcessor.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Annotations / Anchoring / TextViewSelectionProcessor.cs / 1305600 / TextViewSelectionProcessor.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//     A SelectionProcessor subclass which produces locator parts that select 
//     all anchors that intersect with the text in an element's TextView.
// 
// History:
//  11/29/2006: rruiz: Created
//-----------------------------------------------------------------------------
using System; 
using System.Windows;
using System.Collections; 
using System.Collections.Generic; 
using System.Collections.ObjectModel;
using System.Diagnostics; 
using System.Globalization;
using System.Windows.Annotations;
using System.Windows.Annotations.Storage;
using System.Windows.Controls; 
using System.Windows.Documents;
using System.Xml; 
using MS.Utility; 
using System.Windows.Media;
using System.Windows.Controls.Primitives; 
using MS.Internal.Documents;
using MS.Internal.PtsHost;

namespace MS.Internal.Annotations.Anchoring 
{
    ///  
    ///  
    internal class TextViewSelectionProcessor : SelectionProcessor
    { 
        //-----------------------------------------------------
        //
        //  Constructors
        // 
        //-----------------------------------------------------
 
        #region Constructors 

        ///  
        ///     Creates an instance of TextViewSelectionProcessor.
        /// 
        public TextViewSelectionProcessor()
        { 
        }
 
        #endregion Constructors 

        //------------------------------------------------------ 
        //
        //  Public Methods
        //
        //----------------------------------------------------- 

        #region Public Methods 
 
        /// 
        ///     Not implemented for this selection processor. 
        /// 
        /// selection to merge 
        /// other selection to merge 
        /// always set to null because DocumentPageViews cannot be merged 
        /// always returns false because DocumentPageViewss cannot be merged
        public override bool MergeSelections(Object selection1, Object selection2, out Object newSelection) 
        { 
            newSelection = null;
            return false; 
        }


        ///  
        ///     Simply returns the selection passed in which should be an element.
        ///  
        /// the selection to examine 
        /// a list containing the selection
        /// selection is null 
        /// selection is of wrong type
        public override IList GetSelectedNodes(Object selection)
        {
            // Verify selection is a service provider that provides ITextView 
            VerifySelection(selection);
 
            return new DependencyObject[] { (DependencyObject)selection }; 
        }
 
        /// 
        ///     Simply returns the selection which should be an element.
        /// 
        /// the selection to examine 
        /// the selection itself
        /// selection is null 
        /// selection is of wrong type 
        public override UIElement GetParent(Object selection)
        { 
            // Verify selection is a service provider that provides ITextView
            VerifySelection(selection);

            return (UIElement)selection; 
        }
 
 
        /// 
        ///     Gets the anchor point for the selection.  This isn't a runtime selection 
        ///     and therefore shouldn't be anchored to.  This processor returns a point of
        ///     (Double.NaN, Double.NaN).
        /// 
        /// the selection to examine 
        /// selection is null
        /// selection is of wrong type 
        public override Point GetAnchorPoint(Object selection) 
        {
            // Verify selection is a DocumentPageView 
            VerifySelection(selection);

            // Returns the point (Nan,Nan)
            return new Point(double.NaN,double.NaN); 
        }
 
        ///  
        ///     Creates one or more locator parts representing the portion
        ///     of 'startNode' spanned by 'selection'. 
        /// 
        /// the selection that is being processed
        /// the node the locator parts should be in the
        /// context of 
        /// one or more locator parts representing the portion of 'startNode' spanned
        /// by 'selection' 
        /// startNode or selection is null 
        /// selection is of the wrong type
        public override IList 
            GenerateLocatorParts(Object selection, DependencyObject startNode)
        {
            if (startNode == null)
                throw new ArgumentNullException("startNode"); 

            List res = null; 
 
            ITextView textView = VerifySelection(selection);
 
            res = new List(1);

            int startOffset;
            int endOffset; 
            if (textView != null && textView.IsValid)
            { 
                GetTextViewTextRange(textView, out startOffset, out endOffset); 
            }
            else 
            {
                // This causes no content to be loaded
                startOffset = -1;
                endOffset = -1; 
            }
 
            ContentLocatorPart part = new ContentLocatorPart(TextSelectionProcessor.CharacterRangeElementName);// DocumentPageViewLocatorPart(); 
            part.NameValuePairs.Add(TextSelectionProcessor.CountAttribute, 1.ToString(NumberFormatInfo.InvariantInfo));
            part.NameValuePairs.Add(TextSelectionProcessor.SegmentAttribute + 0.ToString(NumberFormatInfo.InvariantInfo), startOffset.ToString(NumberFormatInfo.InvariantInfo) + TextSelectionProcessor.Separator[0] + endOffset.ToString(NumberFormatInfo.InvariantInfo)); 
            part.NameValuePairs.Add(TextSelectionProcessor.IncludeOverlaps, Boolean.TrueString);

            res.Add(part);
 
            return res;
        } 
 
        /// 
        ///     This processor doesn't resolve ContentLocatorParts.  It simply returns null. 
        /// 
        /// locator part specifying data to be spanned
        /// the node to be spanned by the created
        /// selection 
        /// always set to AttachmentLevel.Unresolved
        /// always returns null; this processor does not resolve ContentLocatorParts 
        /// locatorPart or startNode are null 
        public override Object ResolveLocatorPart(ContentLocatorPart locatorPart, DependencyObject startNode, out AttachmentLevel attachmentLevel)
        { 
            if (locatorPart == null)
                throw new ArgumentNullException("locatorPart");

            if (startNode == null) 
                throw new ArgumentNullException("startNode");
 
            attachmentLevel = AttachmentLevel.Unresolved; 

            // ContentLocator Parts generated by this selection processor cannot be resolved 
            return null;
        }

        ///  
        ///     Returns a list of XmlQualifiedNames representing the
        ///     the locator parts this processor can generate.  This processor 
        ///     does not resolve these ContentLocatorParts - only generates them. 
        /// 
        public override XmlQualifiedName[] GetLocatorPartTypes() 
        {
            return (XmlQualifiedName[])LocatorPartTypeNames.Clone();
        }
 
        #endregion Public Methods
 
        //------------------------------------------------------ 
        //
        //  Public Operators 
        //
        //------------------------------------------------------

        //----------------------------------------------------- 
        //
        //  Public Properties 
        // 
        //------------------------------------------------------
 
        //-----------------------------------------------------
        //
        //  Public Events
        // 
        //-----------------------------------------------------
        //----------------------------------------------------- 
        // 
        //  Internal Methods
        // 
        //------------------------------------------------------

        #region Internal Methods
 
        /// 
        /// Returns the TextRange representing the visible contents of the ITextView. 
        /// Also returns the same information in terms of the offsets to the start and end. 
        /// 
        /// ITextView to get visible contents of 
        /// offset into the document representing start of visible content
        /// offset into the document representing end of visible content
        /// TextRange spanning all visible content
        internal static TextRange GetTextViewTextRange(ITextView textView, out int startOffset, out int endOffset) 
        {
            Debug.Assert(textView != null); 
 
            // These are the default in case we don't find any content in the DocumentPageView
            startOffset = int.MinValue; 
            endOffset = 0;

            TextRange textRange = null;
            IList segments = textView.TextSegments; 
            if (segments != null && segments.Count > 0)
            { 
                ITextPointer start = segments[0].Start; 
                ITextPointer end = segments[segments.Count - 1].End;
 
                startOffset = end.TextContainer.Start.GetOffsetToPosition(start);
                endOffset = end.TextContainer.Start.GetOffsetToPosition(end);

                textRange = new TextRange(start, end); 
            }
            return textRange; 
        } 

        #endregion Internal Methods 

        //-----------------------------------------------------
        //
        //  Private Methods 
        //
        //------------------------------------------------------ 
 
        #region Private Methods
 
        /// 
        ///   Verify the selection is of the correct type.
        /// 
        /// selection to verify 
        /// the selection cast to the necessary type
        private ITextView VerifySelection(object selection) 
        { 
            if (selection == null)
                throw new ArgumentNullException("selection"); 

            IServiceProvider provider = selection as IServiceProvider;
            if (provider == null)
                throw new ArgumentException(SR.Get(SRID.SelectionMustBeServiceProvider),"selection"); 

            ITextView textView = provider.GetService(typeof(ITextView)) as ITextView; 
 
            return textView;
        } 

        #endregion Private Methods

        //------------------------------------------------------ 
        //
        //  Private Fields 
        // 
        //-----------------------------------------------------
 
        #region Private Fields

        // ContentLocator part types understood by this processor
        private static readonly XmlQualifiedName[] LocatorPartTypeNames = new XmlQualifiedName[0]; 

        #endregion Private Fields 
 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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TextViewSelectionProcessor.cs source code in C# .NET

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