ContextMenuService.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / ContextMenuService.cs / 1305600 / ContextMenuService.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Windows; 
using System.Windows.Controls;
using System.Windows.Controls.Primitives; 
using System.Windows.Input;
using MS.Internal.KnownBoxes;
using System.ComponentModel;
 
namespace System.Windows.Controls
{ 
    ///  
    ///     Service class that provides the system implementation for displaying ContextMenus.
    ///  
    public static class ContextMenuService
    {
        #region Attached Properties
 
        /// 
        ///     The DependencyProperty for the ContextMenu property. 
        ///  
        public static readonly DependencyProperty ContextMenuProperty =
                DependencyProperty.RegisterAttached( 
                       "ContextMenu",              // Name
                        typeof(ContextMenu),        // Type
                        typeof(ContextMenuService), // Owner
                        new FrameworkPropertyMetadata((ContextMenu)null, 
                                FrameworkPropertyMetadataOptions.None));
 
        ///  
        ///     Gets the value of the ContextMenu property on the specified object.
        ///  
        /// The object on which to query the ContextMenu property.
        /// The value of the ContextMenu property.
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))]
        public static ContextMenu GetContextMenu(DependencyObject element) 
        {
            if (element == null) 
            { 
                throw new ArgumentNullException("element");
            } 

            ContextMenu cm = (ContextMenu)element.GetValue(ContextMenuProperty);

            if ((cm != null) && (element.Dispatcher != cm.Dispatcher)) 
            {
                throw new ArgumentException(SR.Get(SRID.ContextMenuInDifferentDispatcher)); 
            } 

            return cm; 
       }

        /// 
        ///     Sets the ContextMenu property on the specified object. 
        /// 
        /// The object on which to set the ContextMenu property. 
        ///  
        ///     The value of the ContextMenu property. If the value is of type ContextMenu, then
        ///     that is the ContextMenu that will be used (without any modification). If the value 
        ///     is of any other type, then that value will be used as the content for a ContextMenu
        ///     provided by this service, and the other attached properties of this service
        ///     will be used to configure the ContextMenu.
        ///  
        public static void SetContextMenu(DependencyObject element, ContextMenu value)
        { 
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            }
            element.SetValue(ContextMenuProperty, value);
        }
 
        /// 
        ///     The DependencyProperty for the HorizontalOffset property. 
        ///  
        public static readonly DependencyProperty HorizontalOffsetProperty =
            DependencyProperty.RegisterAttached("HorizontalOffset",         // Name 
                                                typeof(double),             // Type
                                                typeof(ContextMenuService), // Owner
                                                new FrameworkPropertyMetadata(0d)); // Default Value
 
        /// 
        ///     Gets the value of the HorizontalOffset property. 
        ///  
        /// The object on which to query the property.
        /// The value of the property. 
        [TypeConverter(typeof(LengthConverter))]
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))]
        public static double GetHorizontalOffset(DependencyObject element)
        { 
            if (element == null)
            { 
                throw new ArgumentNullException("element"); 
            }
            return (double)element.GetValue(HorizontalOffsetProperty); 
        }

        /// 
        ///     Sets the value of the HorizontalOffset property. 
        /// 
        /// The object on which to set the value. 
        /// The desired value of the property. 
        public static void SetHorizontalOffset(DependencyObject element, double value)
        { 
            if (element == null)
            {
                throw new ArgumentNullException("element");
            } 
            element.SetValue(HorizontalOffsetProperty, value);
        } 
 
        /// 
        ///     The DependencyProperty for the VerticalOffset property. 
        /// 
        public static readonly DependencyProperty VerticalOffsetProperty =
            DependencyProperty.RegisterAttached("VerticalOffset",           // Name
                                                typeof(double),             // Type 
                                                typeof(ContextMenuService), // Owner
                                                new FrameworkPropertyMetadata(0d)); // Default Value 
 
        /// 
        ///     Gets the value of the VerticalOffset property. 
        /// 
        /// The object on which to query the property.
        /// The value of the property.
        [TypeConverter(typeof(LengthConverter))] 
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))]
        public static double GetVerticalOffset(DependencyObject element) 
        { 
            if (element == null)
            { 
                throw new ArgumentNullException("element");
            }
            return (double)element.GetValue(VerticalOffsetProperty);
        } 

        ///  
        ///     Sets the value of the VerticalOffset property. 
        /// 
        /// The object on which to set the value. 
        /// The desired value of the property.
        public static void SetVerticalOffset(DependencyObject element, double value)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 
            element.SetValue(VerticalOffsetProperty, value);
        } 

        /// 
        ///     The DependencyProperty for the HasDropShadow property.
        ///  
        public static readonly DependencyProperty HasDropShadowProperty =
            DependencyProperty.RegisterAttached("HasDropShadow",            // Name 
                                                typeof(bool),               // Type 
                                                typeof(ContextMenuService), // Owner
                                                new FrameworkPropertyMetadata(BooleanBoxes.FalseBox)); //Default Value 
        /// 
        ///     Gets the value of the HasDropShadow property.
        /// 
        /// The object on which to query the property. 
        /// The value of the property.
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))] 
        public static bool GetHasDropShadow(DependencyObject element) 
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element");
            }
            return (bool)element.GetValue(HasDropShadowProperty); 
        }
 
        ///  
        ///     Sets the value of the HasDropShadow property.
        ///  
        /// The object on which to set the value.
        /// The desired value of the property.
        public static void SetHasDropShadow(DependencyObject element, bool value)
        { 
            if (element == null)
            { 
                throw new ArgumentNullException("element"); 
            }
            element.SetValue(HasDropShadowProperty, BooleanBoxes.Box(value)); 
        }

        /// 
        ///     The DependencyProperty for the PlacementTarget property. 
        /// 
        public static readonly DependencyProperty PlacementTargetProperty = 
            DependencyProperty.RegisterAttached("PlacementTarget",          // Name 
                                                typeof(UIElement),          // Type
                                                typeof(ContextMenuService), // Owner 
                                                new FrameworkPropertyMetadata((UIElement)null)); // Default Value

        /// 
        ///     Gets the value of the PlacementTarget property. 
        /// 
        /// The object on which to query the property. 
        /// The value of the property. 
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))]
        public static UIElement GetPlacementTarget(DependencyObject element) 
        {
            if (element == null)
            {
                throw new ArgumentNullException("element"); 
            }
            return (UIElement)element.GetValue(PlacementTargetProperty); 
        } 

        ///  
        ///     Sets the value of the PlacementTarget property.
        /// 
        /// The object on which to set the value.
        /// The desired value of the property. 
        public static void SetPlacementTarget(DependencyObject element, UIElement value)
        { 
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            }
            element.SetValue(PlacementTargetProperty, value);
        }
 
        /// 
        ///     The DependencyProperty for the PlacementRectangle property. 
        ///  
        public static readonly DependencyProperty PlacementRectangleProperty =
            DependencyProperty.RegisterAttached("PlacementRectangle",       // Name 
                                                typeof(Rect),               // Type
                                                typeof(ContextMenuService), // Owner
                                                new FrameworkPropertyMetadata(Rect.Empty)); // Default Value
 
        /// 
        ///     Gets the value of the PlacementRectangle property. 
        ///  
        /// The object on which to query the property.
        /// The value of the property. 
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))]
        public static Rect GetPlacementRectangle(DependencyObject element)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 
            return (Rect)element.GetValue(PlacementRectangleProperty);
        } 

        /// 
        ///     Sets the value of the PlacementRectangle property.
        ///  
        /// The object on which to set the value.
        /// The desired value of the property. 
        public static void SetPlacementRectangle(DependencyObject element, Rect value) 
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element");
            }
            element.SetValue(PlacementRectangleProperty, value); 
        }
 
        ///  
        ///     The DependencyProperty for the Placement property.
        ///  
        public static readonly DependencyProperty PlacementProperty =
            DependencyProperty.RegisterAttached("Placement",                // Name
                                                typeof(PlacementMode),      // Type
                                                typeof(ContextMenuService), // Owner 
                                                new FrameworkPropertyMetadata(PlacementMode.MousePoint)); // Default Value
 
        ///  
        ///     Gets the value of the Placement property.
        ///  
        /// The object on which to query the property.
        /// The value of the property.
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))]
        public static PlacementMode GetPlacement(DependencyObject element) 
        {
            if (element == null) 
            { 
                throw new ArgumentNullException("element");
            } 
            return (PlacementMode)element.GetValue(PlacementProperty);
        }

        ///  
        ///     Sets the value of the Placement property.
        ///  
        /// The object on which to set the value. 
        /// The desired value of the property.
        public static void SetPlacement(DependencyObject element, PlacementMode value) 
        {
            if (element == null)
            {
                throw new ArgumentNullException("element"); 
            }
            element.SetValue(PlacementProperty, value); 
        } 

        ///  
        ///     The DependencyProperty for the ShowOnDisabled property.
        /// 
        public static readonly DependencyProperty ShowOnDisabledProperty =
            DependencyProperty.RegisterAttached("ShowOnDisabled",           // Name 
                                                typeof(bool),               // Type
                                                typeof(ContextMenuService), // Owner 
                                                new FrameworkPropertyMetadata(BooleanBoxes.FalseBox)); // Default Value 

        ///  
        ///     Gets the value of the ShowOnDisabled property.
        /// 
        /// The object on which to query the property.
        /// The value of the property. 
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))]
        public static bool GetShowOnDisabled(DependencyObject element) 
        { 
            if (element == null)
            { 
                throw new ArgumentNullException("element");
            }
            return (bool)element.GetValue(ShowOnDisabledProperty);
        } 

        ///  
        ///     Sets the value of the ShowOnDisabled property. 
        /// 
        /// The object on which to set the value. 
        /// The desired value of the property.
        public static void SetShowOnDisabled(DependencyObject element, bool value)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 
            element.SetValue(ShowOnDisabledProperty, BooleanBoxes.Box(value));
        } 

        /// 
        ///     The DependencyProperty for the IsEnabled property.
        ///  
        public static readonly DependencyProperty IsEnabledProperty =
            DependencyProperty.RegisterAttached("IsEnabled",                // Name 
                                                typeof(bool),               // Type 
                                                typeof(ContextMenuService), // Owner
                                                new FrameworkPropertyMetadata(BooleanBoxes.TrueBox)); // Default Value 

        /// 
        ///     Gets the value of the IsEnabled property.
        ///  
        /// The object on which to query the property.
        /// The value of the property. 
        [AttachedPropertyBrowsableForType(typeof(DependencyObject))] 
        public static bool GetIsEnabled(DependencyObject element)
        { 
            if (element == null)
            {
                throw new ArgumentNullException("element");
            } 
            return (bool)element.GetValue(IsEnabledProperty);
        } 
 
        /// 
        ///     Sets the value of the IsEnabled property. 
        /// 
        /// The object on which to set the value.
        /// The desired value of the property.
        public static void SetIsEnabled(DependencyObject element, bool value) 
        {
            if (element == null) 
            { 
                throw new ArgumentNullException("element");
            } 
            element.SetValue(IsEnabledProperty, BooleanBoxes.Box(value));
        }

        #endregion 

        #region Events 
 
        /// 
        ///     An event that fires just before a ContextMenu should be opened. 
        ///
        ///     To manually open and close ContextMenus, mark this event as handled.
        ///     Otherwise, the value of the the ContextMenu property will be used
        ///     to automatically open a ContextMenu. 
        /// 
        public static readonly RoutedEvent ContextMenuOpeningEvent = 
            EventManager.RegisterRoutedEvent("ContextMenuOpening", 
                                               RoutingStrategy.Bubble,
                                               typeof(ContextMenuEventHandler), 
                                               typeof(ContextMenuService));

        /// 
        ///     An event that fires just as a ContextMenu closes. 
        /// 
        public static readonly RoutedEvent ContextMenuClosingEvent = 
            EventManager.RegisterRoutedEvent("ContextMenuClosing", 
                                               RoutingStrategy.Bubble,
                                               typeof(ContextMenuEventHandler), 
                                               typeof(ContextMenuService));

        static ContextMenuService()
        { 
            EventManager.RegisterClassHandler(typeof(UIElement), ContextMenuOpeningEvent, new ContextMenuEventHandler(OnContextMenuOpening));
            EventManager.RegisterClassHandler(typeof(ContentElement), ContextMenuOpeningEvent, new ContextMenuEventHandler(OnContextMenuOpening)); 
            EventManager.RegisterClassHandler(typeof(UIElement3D), ContextMenuOpeningEvent, new ContextMenuEventHandler(OnContextMenuOpening)); 
        }
 
        private static void OnContextMenuOpening(object sender, ContextMenuEventArgs e)
        {
            if (e.TargetElement == null)
            { 
                DependencyObject o = sender as DependencyObject;
                if (o != null) 
                { 
                    if (ContextMenuIsEnabled(o))
                    { 
                        // Store for later
                        e.TargetElement = o;
                    }
                } 
            }
        } 
 
        #endregion
 
        #region Implementation

        internal static bool ContextMenuIsEnabled(DependencyObject o)
        { 
            bool contextMenuIsEnabled = false;
            object menu = GetContextMenu(o); 
            if ((menu != null) && GetIsEnabled(o)) 
            {
                if (PopupControlService.IsElementEnabled(o) || GetShowOnDisabled(o)) 
                {
                    contextMenuIsEnabled = true;
                }
            } 

            return contextMenuIsEnabled; 
        } 

        #endregion 
    }

    /// 
    /// The callback type for handling a ContextMenuEvent 
    /// 
    public delegate void ContextMenuEventHandler(object sender, ContextMenuEventArgs e); 
 
    /// 
    /// The data sent on a ContextMenuEvent 
    /// 
    public sealed class ContextMenuEventArgs : RoutedEventArgs
    {
        internal ContextMenuEventArgs(object source, bool opening) 
            : this(source, opening, -1.0, -1.0)
        { 
        } 

        internal ContextMenuEventArgs(object source, bool opening, double left, double top) 
        {
            _left = left;
            _top = top;
            RoutedEvent =(opening ? ContextMenuService.ContextMenuOpeningEvent : ContextMenuService.ContextMenuClosingEvent); 
            Source = source;
        } 
 
        /// 
        ///     Position (horizontal) that context menu should displayed 
        /// 
        public double CursorLeft
        {
            get { return _left; } 
        }
 
        ///  
        /// Position (vertical) that context menu should displayed
        ///  
        public double CursorTop
        {
            get { return _top; }
        } 

        internal DependencyObject TargetElement 
        { 
            get { return _targetElement; }
            set { _targetElement = value; } 
        }

        /// 
        /// Support DynamicInvoke for ContextMenuEvent 
        /// 
        ///  
        ///  
        protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget)
        { 
            ContextMenuEventHandler handler = (ContextMenuEventHandler)genericHandler;
            handler(genericTarget, this);
        }
 
        private double _left;
        private double _top; 
        private DependencyObject _targetElement; 
    }
 
}

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

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