Manipulation.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / Manipulation.cs / 1305600 / Manipulation.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.ComponentModel; 
using System.Diagnostics;
using System.Windows; 
using System.Windows.Media;
using System.Windows.Input.Manipulations;
using MS.Internal.PresentationCore;
 
namespace System.Windows.Input
{ 
    ///  
    ///     Provides access to various features and settings of manipulation.
    ///  
    public static class Manipulation
    {
        internal static readonly RoutedEvent ManipulationStartingEvent = EventManager.RegisterRoutedEvent("ManipulationStarting", RoutingStrategy.Bubble, typeof(EventHandler), typeof(ManipulationDevice));
        internal static readonly RoutedEvent ManipulationStartedEvent = EventManager.RegisterRoutedEvent("ManipulationStarted", RoutingStrategy.Bubble, typeof(EventHandler), typeof(ManipulationDevice)); 
        internal static readonly RoutedEvent ManipulationDeltaEvent = EventManager.RegisterRoutedEvent("ManipulationDelta", RoutingStrategy.Bubble, typeof(EventHandler), typeof(ManipulationDevice));
        internal static readonly RoutedEvent ManipulationInertiaStartingEvent = EventManager.RegisterRoutedEvent("ManipulationInertiaStarting", RoutingStrategy.Bubble, typeof(EventHandler), typeof(ManipulationDevice)); 
        internal static readonly RoutedEvent ManipulationBoundaryFeedbackEvent = EventManager.RegisterRoutedEvent("ManipulationBoundaryFeedback", RoutingStrategy.Bubble, typeof(EventHandler), typeof(ManipulationDevice)); 
        internal static readonly RoutedEvent ManipulationCompletedEvent = EventManager.RegisterRoutedEvent("ManipulationCompleted", RoutingStrategy.Bubble, typeof(EventHandler), typeof(ManipulationDevice));
 
        /// 
        ///     Determines if a manipulation is currently active on an element.
        /// 
        /// Specifies the element that may or may not have a manipulation. 
        /// True if there is an active manipulation, false otherwise.
        public static bool IsManipulationActive(UIElement element) 
        { 
            if (element == null)
            { 
                throw new ArgumentNullException("element");
            }

            return GetActiveManipulationDevice(element) != null; 
        }
 
        private static ManipulationDevice GetActiveManipulationDevice(UIElement element) 
        {
            Debug.Assert(element != null, "element should be non-null."); 

            ManipulationDevice device = ManipulationDevice.GetManipulationDevice(element);
            if ((device != null) && device.IsManipulationActive)
            { 
                return device;
            } 
 
            return null;
        } 

        /// 
        ///     If a manipulation is active, forces the manipulation to proceed to the inertia phase.
        ///     If inertia is already occurring, it will restart inertia. 
        /// 
        /// The element on which there is an active manipulation. 
        public static void StartInertia(UIElement element) 
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element");
            }
 
            ManipulationDevice device = ManipulationDevice.GetManipulationDevice(element);
            if (device != null) 
            { 
                device.CompleteManipulation(/* withInertia = */ true);
            } 
        }

        /// 
        ///     If a manipulation is active, forces the manipulation to complete. 
        /// 
        /// The element on which there is an active manipulation. 
        public static void CompleteManipulation(UIElement element) 
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element");
            }
            if (!TryCompleteManipulation(element)) 
            {
                throw new InvalidOperationException(SR.Get(SRID.Manipulation_ManipulationNotActive)); 
            } 
        }
 
        internal static bool TryCompleteManipulation(UIElement element)
        {
            ManipulationDevice device = ManipulationDevice.GetManipulationDevice(element);
            if (device != null) 
            {
                device.CompleteManipulation(/* withInertia = */ false); 
                return true; 
            }
 
            return false;
        }

        ///  
        ///     Changes the manipulation mode of an active manipulation.
        ///  
        /// The element on which there is an active manipulation. 
        /// The new manipulation mode.
        public static void SetManipulationMode(UIElement element, ManipulationModes mode) 
        {
            if (element == null)
            {
                throw new ArgumentNullException("element"); 
            }
 
            ManipulationDevice device = GetActiveManipulationDevice(element); 
            if (device != null)
            { 
                device.ManipulationMode = mode;
            }
            else
            { 
                throw new InvalidOperationException(SR.Get(SRID.Manipulation_ManipulationNotActive));
            } 
        } 

        ///  
        ///     Retrieves the current manipulation mode of an active manipulation.
        /// 
        /// The element on which there is an active manipulation.
        /// The current manipulation mode. 
        public static ManipulationModes GetManipulationMode(UIElement element)
        { 
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            }

            ManipulationDevice device = ManipulationDevice.GetManipulationDevice(element);
            if (device != null) 
            {
                return device.ManipulationMode; 
            } 
            else
            { 
                return ManipulationModes.None;
            }
        }
 
        /// 
        ///     Changes the container that defines the coordinate space of event data 
        ///     for an active manipulation. 
        /// 
        /// The element on which there is an active manipulation. 
        /// The container that defines the coordinate space.
        public static void SetManipulationContainer(UIElement element, IInputElement container)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 

            ManipulationDevice device = GetActiveManipulationDevice(element); 
            if (device != null)
            {
                device.ManipulationContainer = container;
            } 
            else
            { 
                throw new InvalidOperationException(SR.Get(SRID.Manipulation_ManipulationNotActive)); 
            }
        } 

        /// 
        ///     Retrieves the container that defines the coordinate space of event data
        ///     for an active manipulation. 
        /// 
        /// The element on which there is an active manipulation. 
        /// The container that defines the coordinate space. 
        public static IInputElement GetManipulationContainer(UIElement element)
        { 
            if (element == null)
            {
                throw new ArgumentNullException("element");
            } 

            ManipulationDevice device = ManipulationDevice.GetManipulationDevice(element); 
            if (device != null) 
            {
                return device.ManipulationContainer; 
            }

            return null;
        } 

        ///  
        ///     Changes the pivot for single-finger manipulation on an active manipulation. 
        /// 
        /// The element on which there is an active manipulation. 
        /// The new pivot for single-finger manipulation.
        public static void SetManipulationPivot(UIElement element, ManipulationPivot pivot)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 

            ManipulationDevice device = GetActiveManipulationDevice(element); 
            if (device != null)
            {
                device.ManipulationPivot = pivot;
            } 
            else
            { 
                throw new InvalidOperationException(SR.Get(SRID.Manipulation_ManipulationNotActive)); 
            }
        } 

        /// 
        ///     Retrieves the pivot for single-finger manipulation on an active manipulation.
        ///  
        /// The element on which there is an active manipulation.
        /// The pivot for single-finger manipulation. 
        public static ManipulationPivot GetManipulationPivot(UIElement element) 
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element");
            }
 
            ManipulationDevice device = ManipulationDevice.GetManipulationDevice(element);
            if (device != null) 
            { 
                return device.ManipulationPivot;
            } 

            return null;
        }
 
        /// 
        ///     Associates a manipulator with a UIElement. This will either will start an 
        ///     active manipulation or add to an existing one. 
        /// 
        /// The element with which to associate the manipulator. 
        /// The manipulator, such as a TouchDevice.
        public static void AddManipulator(UIElement element, IManipulator manipulator)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 
            if (manipulator == null)
            { 
                throw new ArgumentNullException("manipulator");
            }
            if (!element.IsManipulationEnabled)
            { 
                throw new InvalidOperationException(SR.Get(SRID.Manipulation_ManipulationNotEnabled));
            } 
 
            ManipulationDevice device = ManipulationDevice.AddManipulationDevice(element);
            device.AddManipulator(manipulator); 
        }

        /// 
        ///     Disassociates a manipulator with a UIElement. This will remove it from 
        ///     an active manipulation, possibly completing it.
        ///  
        /// The element that the manipulator used to be associated with. 
        /// The manipulator, such as a TouchDevice.
        public static void RemoveManipulator(UIElement element, IManipulator manipulator) 
        {
            if (element == null)
            {
                throw new ArgumentNullException("element"); 
            }
            if (manipulator == null) 
            { 
                throw new ArgumentNullException("manipulator");
            } 

            if (!TryRemoveManipulator(element, manipulator))
            {
                throw new InvalidOperationException(SR.Get(SRID.Manipulation_ManipulationNotActive)); 
            }
        } 
 
        internal static bool TryRemoveManipulator(UIElement element, IManipulator manipulator)
        { 
            ManipulationDevice device = ManipulationDevice.GetManipulationDevice(element);
            if (device != null)
            {
                device.RemoveManipulator(manipulator); 
                return true;
            } 
 
            return false;
        } 

        /// 
        ///     Adds a ManipulationParameters2D object to an active manipulation.
        ///  
        /// The element on which there is an active manipulation.
        /// The parameter. 
        [Browsable(false)] 
        public static void SetManipulationParameter(UIElement element, ManipulationParameters2D parameter)
        { 
            if (element == null)
            {
                throw new ArgumentNullException("element");
            } 
            if (parameter == null)
            { 
                throw new ArgumentNullException("parameter"); 
            }
 
            ManipulationDevice device = GetActiveManipulationDevice(element);
            if (device != null)
            {
                device.SetManipulationParameters(parameter); 
            }
            else 
            { 
                throw new InvalidOperationException(SR.Get(SRID.Manipulation_ManipulationNotActive));
            } 
        }

        /// 
        ///     Searches from the specified visual (inclusively) up the visual tree 
        ///     for a UIElement that has a ManipulationMode that desires manipulation events.
        ///  
        ///  
        ///     The starting element. Usually, this is an element that an input device has hit-tested to.
        ///  
        /// 
        ///     A UIElement that has ManipulationMode set to Translate, Scale, Rotate, or some combination of the three.
        ///     If no element is found, then null is returned.
        ///  
        /// 
        ///     This function reads data that is thread-bound and should be 
        ///     called on the same thread that 'visual' is bound to. 
        /// 
        internal static UIElement FindManipulationParent(Visual visual) 
        {
            while (visual != null)
            {
                UIElement element = visual as UIElement; 
                if ((element != null) && element.IsManipulationEnabled)
                { 
                    return element; 
                }
                else 
                {
                    visual = VisualTreeHelper.GetParent(visual) as Visual;
                }
            } 

            return null; 
        } 
    }
} 

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