StylusEditingBehavior.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Ink / StylusEditingBehavior.cs / 1305600 / StylusEditingBehavior.cs
                        
                        
                            using System; 
using System.Diagnostics;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections; 
using System.Collections.Generic;
using System.Windows.Input; 
using System.Windows; 
using System.Windows.Controls;
using System.Windows.Controls.Primitives; 
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Interop;
using System.Windows.Navigation; 
using System.Windows.Media;
using System.Security; 
using System.Security.Permissions; 

namespace MS.Internal.Ink 
{
    /// 
    /// IStylusEditing Interface
    ///  
    internal interface IStylusEditing
    { 
        ///  
        /// AddStylusPoints
        ///  
        /// stylusPoints
        /// only true if eventArgs.UserInitiated is true
        void AddStylusPoints(StylusPointCollection stylusPoints, bool userInitiated);
    } 

    ///  
    /// StylusEditingBehavior - a base class for all stylus related editing behaviors 
    /// 
    internal abstract class StylusEditingBehavior : EditingBehavior, IStylusEditing 
    {
        //--------------------------------------------------------------------------------
        //
        // Constructors 
        //
        //------------------------------------------------------------------------------- 
 
        #region Constructors
 
        /// 
        /// Constructor
        /// 
        ///  
        /// 
        internal StylusEditingBehavior(EditingCoordinator editingCoordinator, InkCanvas inkCanvas) 
            : base(editingCoordinator, inkCanvas) 
        {
        } 

        #endregion Constructors

        //------------------------------------------------------------------------------- 
        //
        // Internal Methods 
        // 
        //-------------------------------------------------------------------------------
 
        #region Internal Methods

        /// 
        /// An internal method which performs a mode change in mid-stroke. 
        /// 
        ///  
        internal void SwitchToMode(InkCanvasEditingMode mode) 
        {
            // NTRAID:WINDOWSOS#1464481-2006/01/30/-WAYNEZEN, 
            // The dispather frames can be entered. If one calls InkCanvas.Select/Paste from a dispather frame
            // during the user editing, this method will be called. But before the method is processed completely,
            // the user input could kick in AddStylusPoints. So EditingCoordinator.UserIsEditing flag may be messed up.
            // Now we use _disableInput to disable the input during changing the mode in mid-stroke. 
            _disableInput = true;
            try 
            { 
                OnSwitchToMode(mode);
            } 
            finally
            {
                _disableInput = false;
            } 
        }
 
        #endregion Internal Methods 

        //-------------------------------------------------------------------------------- 
        //
        // IStylusEditing Interface
        //
        //------------------------------------------------------------------------------- 

        #region IStylusEditing Interface 
 
        /// 
        /// IStylusEditing.AddStylusPoints 
        /// 
        /// stylusPoints
        /// true if the eventArgs source had UserInitiated set to true
        ///  
        ///     Critical: Calls critical methods StylusInputBegin and StylusInputContinue
        /// 
        ///     Note that for InkCollectionBehavior, which inherits from this class, the stylusPoints 
        ///     passed through this API are critical.  For EraserBehavior and LassoSelectionBehavior, which
        ///     also inherit from this class, the stylusPoints are not critical.  This is because only 
        ///     InkCollectionBehavior calls a critical method with the stylusPoints as an argument.
        /// 
        [SecurityCritical]
        void IStylusEditing.AddStylusPoints(StylusPointCollection stylusPoints, bool userInitiated) 
        {
            EditingCoordinator.DebugCheckActiveBehavior(this); 
 
            // Don't process if SwitchToMode is called during the mid-stroke.
            if ( _disableInput ) 
            {
                return;
            }
 
            if ( !EditingCoordinator.UserIsEditing )
            { 
                EditingCoordinator.UserIsEditing = true; 
                StylusInputBegin(stylusPoints, userInitiated);
            } 
            else
            {
                StylusInputContinue(stylusPoints, userInitiated);
            } 
        }
 
        #endregion IStylusEditing Interface 

        //-------------------------------------------------------------------------------- 
        //
        // Protected Methods
        //
        //-------------------------------------------------------------------------------- 

        #region Protected Methods 
 
        /// 
        /// An abstract method which performs a mode change in mid-stroke. 
        /// 
        /// 
        protected abstract void OnSwitchToMode(InkCanvasEditingMode mode);
 
        /// 
        /// Called when the InkEditingBehavior is activated. 
        ///  
        protected override void OnActivate()
        { 
        }

        /// 
        /// Called when the InkEditingBehavior is deactivated. 
        /// 
        protected override void OnDeactivate() 
        { 
        }
 
        /// 
        /// OnCommit
        /// 
        ///  
        protected sealed override void OnCommit(bool commit)
        { 
            // Make sure that user is still editing 
            if ( EditingCoordinator.UserIsEditing )
            { 
                EditingCoordinator.UserIsEditing = false;

                // The follow code raises variety editing events.
                // The out-side code could throw exception in the their handlers. We use try/finally block to protect our status. 
                StylusInputEnd(commit);
            } 
            else 
            {
                // If user isn't editing, we should still call the derive class. 
                // So the dynamic behavior like LSB can be self deactivated when it has been commited.
                OnCommitWithoutStylusInput(commit);
            }
        } 

        ///  
        /// StylusInputBegin 
        /// 
        /// stylusPoints 
        /// true if the source eventArgs.UserInitiated flag is true
        /// 
        ///     Critical: Handles critical data stylusPoints, which is critical
        ///         when InkCollectionBehavior uses it to call critical method 
        ///         InkCanvas.RaiseGestureOrStrokeCollected
        /// 
        ///     Note that for InkCollectionBehavior, which inherits from this class, the stylusPoints 
        ///     passed through this API are critical.  For EraserBehavior and LassoSelectionBehavior, which
        ///     also inherit from this class, the stylusPoints are not critical.  This is because only 
        ///     InkCollectionBehavior calls a critical method with the stylusPoints as an argument.
        /// 
        [SecurityCritical]
        protected virtual void StylusInputBegin(StylusPointCollection stylusPoints, bool userInitiated) 
        {
            //defer to derived classes 
        } 

        ///  
        /// StylusInputContinue
        /// 
        /// stylusPoints
        /// true if the source eventArgs.UserInitiated flag is true 
        /// 
        ///     Critical: Handles critical data stylusPoints, which is critical 
        ///         when InkCollectionBehavior uses it to call critical method InkCanvas.RaiseGestureOrStrokeCollected 
        ///
        ///     Note that for InkCollectionBehavior, which inherits from this class, the stylusPoints 
        ///     passed through this API are critical.  For EraserBehavior and LassoSelectionBehavior, which
        ///     also inherit from this class, the stylusPoints are not critical.  This is because only
        ///     InkCollectionBehavior calls a critical method with the stylusPoints as an argument.
        ///  
        [SecurityCritical]
        protected virtual void StylusInputContinue(StylusPointCollection stylusPoints, bool userInitiated) 
        { 
            //defer to derived classes
        } 

        /// 
        /// StylusInputEnd
        ///  
        /// 
        protected virtual void StylusInputEnd(bool commit) 
        { 
            //defer to derived classes
        } 

        /// 
        /// OnCommitWithoutStylusInput
        ///  
        /// 
        protected virtual void OnCommitWithoutStylusInput(bool commit) 
        { 
            //defer to derived classes
        } 

        #endregion Protected Methods

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

        private bool    _disableInput;  // No need for initializing. The default value is false.
 
        #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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StylusEditingBehavior.cs source code in C# .NET

Source code for the .NET framework in C#

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