InertiaTranslationBehavior.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / InertiaTranslationBehavior.cs / 1305600 / InertiaTranslationBehavior.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Diagnostics; 
using System.Windows;
using System.Windows.Input.Manipulations; 

namespace System.Windows.Input
{
    ///  
    ///     Provides information about the inertia behavior.
    ///  
    public class InertiaTranslationBehavior 
    {
        ///  
        ///     Instantiates a new instance of this class.
        /// 
        public InertiaTranslationBehavior()
        { 
        }
 
        ///  
        ///     Instantiates a new instance of this class.
        ///  
        internal InertiaTranslationBehavior(Vector initialVelocity)
        {
            _initialVelocity = initialVelocity;
        } 

        ///  
        ///     The initial rate of change of position of the element at the start of the inertia phase. 
        /// 
        public Vector InitialVelocity 
        {
            get { return _initialVelocity; }
            set
            { 
                _isInitialVelocitySet = true;
                _initialVelocity = value; 
            } 
        }
 
        /// 
        ///     The desired rate of change of velocity.
        /// 
        public double DesiredDeceleration 
        {
            get { return _desiredDeceleration; } 
            set 
            {
                if (Double.IsInfinity(value) || Double.IsNaN(value)) 
                {
                    throw new ArgumentOutOfRangeException("value");
                }
 
                _isDesiredDecelerationSet = true;
                _desiredDeceleration = value; 
                _isDesiredDisplacementSet = false; 
                _desiredDisplacement = double.NaN;
            } 
        }

        /// 
        ///     The desired total change in position. 
        /// 
        public double DesiredDisplacement 
        { 
            get { return _desiredDisplacement; }
            set 
            {
                if (Double.IsInfinity(value) || Double.IsNaN(value))
                {
                    throw new ArgumentOutOfRangeException("value"); 
                }
 
                _isDesiredDisplacementSet = true; 
                _desiredDisplacement = value;
                _isDesiredDecelerationSet = false; 
                _desiredDeceleration = double.NaN;
            }
        }
 
        internal bool CanUseForInertia()
        { 
            return _isInitialVelocitySet || _isDesiredDecelerationSet || _isDesiredDisplacementSet; 
        }
 
        internal static void ApplyParameters(InertiaTranslationBehavior behavior, InertiaProcessor2D processor, Vector initialVelocity)
        {
            if (behavior != null && behavior.CanUseForInertia())
            { 
                InertiaTranslationBehavior2D behavior2D = new InertiaTranslationBehavior2D();
                if (behavior._isInitialVelocitySet) 
                { 
                    behavior2D.InitialVelocityX = (float)behavior._initialVelocity.X;
                    behavior2D.InitialVelocityY = (float)behavior._initialVelocity.Y; 
                }
                else
                {
                    behavior2D.InitialVelocityX = (float)initialVelocity.X; 
                    behavior2D.InitialVelocityY = (float)initialVelocity.Y;
                } 
                if (behavior._isDesiredDecelerationSet) 
                {
                    behavior2D.DesiredDeceleration = (float)behavior._desiredDeceleration; 
                }
                if (behavior._isDesiredDisplacementSet)
                {
                    behavior2D.DesiredDisplacement = (float)behavior._desiredDisplacement; 
                }
 
                processor.TranslationBehavior = behavior2D; 
            }
        } 

        private bool _isInitialVelocitySet;
        private Vector _initialVelocity = new Vector(double.NaN, double.NaN);
        private bool _isDesiredDecelerationSet; 
        private double _desiredDeceleration = double.NaN;
        private bool _isDesiredDisplacementSet; 
        private double _desiredDisplacement = double.NaN; 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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