TreeNodeSelectionProcessor.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Annotations / Anchoring / TreeNodeSelectionProcessor.cs / 1305600 / TreeNodeSelectionProcessor.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//     TreeNodeSelectionProcessor is a selection processor 
//     that can handle Logical Tree Nodes as selections.
//     Spec: http://team/sites/ag/Specifications/Anchoring%20Namespace%20Spec.doc 
//
// History:
//  8/8/2003:   magedz: Created
//  08/18/2003: rruiz:  Updated to Anchoring Namespace Spec. 
//
//----------------------------------------------------------------------------- 
using System; 
using System.Collections;
using System.Collections.Generic; 
using System.Globalization;
using System.Windows;
using System.Windows.Annotations;
using System.Windows.Annotations.Storage; 
using System.Windows.Documents;
using System.Windows.Media; 
using System.Xml; 
using MS.Utility;
 
namespace MS.Internal.Annotations.Anchoring
{
    /// 
    ///     TreeNodeSelectionProcessor is a selection processor 
    ///     that can handle Logical Tree Nodes as selections.
    ///  
    internal sealed class TreeNodeSelectionProcessor : SelectionProcessor 
    {
        //----------------------------------------------------- 
        //
        //  Constructors
        //
        //----------------------------------------------------- 

        #region Constructors 
 
        /// 
        ///     Creates an instance of TreeNodeSelectionProcessor. 
        /// 
        public TreeNodeSelectionProcessor()
        {
        } 

        #endregion Constructors 
 
        //------------------------------------------------------
        // 
        //  Public Methods
        //
        //-----------------------------------------------------
 
        #region Public Methods
 
        ///  
        ///     Merges the two selections into one, if possible.
        ///  
        /// selection to merge 
        /// other selection to merge 
        /// new selection that contains the data from both
        /// selection1 and selection2 
        /// always returns false, Logical Tree Nodes cannot be merged
        ///  
        /// selection1 or selection2 are 
        /// null
        public override bool MergeSelections(Object selection1, Object selection2, out Object newSelection) 
        {
            if (selection1 == null)
                throw new ArgumentNullException("selection1");
 
            if (selection2 == null)
                throw new ArgumentNullException("selection2"); 
 
            newSelection = null;
            return false; 
        }

        /// 
        ///     Gets the tree elements spanned by the selection. 
        /// 
        /// the selection to examine 
        /// a list of elements spanned by the selection; never returns 
        /// null
        /// selection is null 
        /// selection is of wrong type
        public override IList GetSelectedNodes(Object selection)
        {
            return new DependencyObject[] { GetParent(selection) }; 
        }
 
        ///  
        ///     Gets the parent element of this selection.
        ///  
        /// the selection to examine
        /// the parent element of the selection; can be null
        /// selection is null
        /// selection is of wrong type 
        public override UIElement GetParent(Object selection)
        { 
            if (selection == null) 
                throw new ArgumentNullException("selection");
 
            UIElement element = selection as UIElement;
            if (element == null)
            {
                throw new ArgumentException(SR.Get(SRID.WrongSelectionType), "selection"); 
            }
 
            return element; 
        }
 
        /// 
        ///     Gets the anchor point for the selection
        /// 
        /// the selection to examine 
        /// the anchor point of the selection; can be null
        /// selection is null 
        /// selection is of wrong type 
        public override Point GetAnchorPoint(Object selection)
        { 
            if (selection == null)
                throw new ArgumentNullException("selection");

            Visual element = selection as Visual; 

            if (element == null) 
                throw new ArgumentException(SR.Get(SRID.WrongSelectionType), "selection"); 

            // get the Visual's bounding rectangle's let, top and store them in a point 
            Rect rect = element.VisualContentBounds;

            return new Point(rect.Left, rect.Top);
        } 

        ///  
        ///     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 
        /// startNode is not a DependencyObject or 
        /// selection is of the wrong type
        public override IList GenerateLocatorParts(Object selection, DependencyObject startNode) 
        {
            if (startNode == null)
                throw new ArgumentNullException("startNode");
 
            if (selection == null)
                throw new ArgumentNullException("selection"); 
 
            return new List(0);
        } 

        /// 
        ///     Creates a selection object spanning the portion of 'startNode'
        ///     specified by 'locatorPart'. 
        /// 
        /// locator part specifying data to be spanned 
        /// the node to be spanned by the created 
        /// selection
        /// always set to AttachmentLevel.Full 
        /// a selection spanning the portion of 'startNode' specified by
        /// 'locatorPart'
        /// locatorPart or startNode are
        /// null 
        /// locatorPart is of the incorrect type
        public override Object ResolveLocatorPart(ContentLocatorPart locatorPart, DependencyObject startNode, out AttachmentLevel attachmentLevel) 
        { 
            if (startNode == null)
                throw new ArgumentNullException("startNode"); 

            if (locatorPart == null)
                throw new ArgumentNullException("locatorPart");
 
            attachmentLevel = AttachmentLevel.Full;
 
            return startNode; 
        }
 
        /// 
        ///     Returns a list of XmlQualifiedNames representing the
        ///     the locator parts this processor can resolve/generate.
        ///  
        public override XmlQualifiedName[] GetLocatorPartTypes()
        { 
            return (XmlQualifiedName[])LocatorPartTypeNames.Clone(); 
        }
 
        #endregion Public Methods

        //------------------------------------------------------
        // 
        //  Public Operators
        // 
        //------------------------------------------------------ 
        //-----------------------------------------------------
        // 
        //  Public Properties
        //
        //------------------------------------------------------
 
        //-----------------------------------------------------
        // 
        //  Public Events 
        //
        //----------------------------------------------------- 
        //-----------------------------------------------------
        //
        //  Private Fields
        // 
        //------------------------------------------------------
 
        #region Private Fields 

        // ContentLocatorPart 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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TreeNodeSelectionProcessor.cs source code in C# .NET

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