ViewPort3D.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / ViewPort3D.cs / 2 / ViewPort3D.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: Viewport3D.cs 
//
// Description: Viewport3D element is a UIElement that contains a 3D 
// scene and a camera that defines the scene's projection into the 2D 
// rectangle of the control.
// 
// History:
//  11/17/2003 : [....] - created.
//
//--------------------------------------------------------------------------- 

using MS.Internal; 
using MS.Internal.KnownBoxes; 
using System;
using System.ComponentModel; 
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Windows;
using System.Windows.Automation.Peers; 
using System.Windows.Media;
using System.Windows.Media.Media3D; 
using System.Windows.Markup; 
using System.Windows.Threading;
 
namespace System.Windows.Controls
{
    /// 
    ///     The Viewport3D provides the Camera and layout bounds 
    ///     required to project the Visual3Ds into 2D.  The Viewport3D
    ///     is the bridge between 2D visuals and 3D. 
    ///  
    [ContentProperty("Children")]
    [Localizability(LocalizationCategory.NeverLocalize)] 
    public class Viewport3D : FrameworkElement, IAddChild
    {
        //-----------------------------------------------------
        // 
        //  Constructors
        // 
        //----------------------------------------------------- 

        #region Constructors 

        static Viewport3D()
        {
            // Viewport3Ds do not really have a "Desired Bounds" since the 
            // camera frustum is scaled to the width of the viewport rect.
            // As a result, layout never imposes a clip on Viewport3D. 
            // 
            // This makes it very easy to render Visual3Ds outside of the
            // layout bounds.  Most framework users find this surprising. 
            // As a result, we clip Viewport3Ds to bounds by default.
            ClipToBoundsProperty.OverrideMetadata(typeof(Viewport3D), new PropertyMetadata(BooleanBoxes.TrueBox));
        }
 
        /// 
        /// Viewport3D Constructor 
        ///  
        public Viewport3D()
        { 
            _viewport3DVisual = new Viewport3DVisual();

            // The value for the Camera property and the Children property on Viewport3D
            // will also be the value for these properties on the Viewport3DVisual we 
            // create as an internal Visual child.  This then will cause these values to
            // be shared, which will break property inheritance, dynamic resource references 
            // and databinding.  To prevent this, we mark the internal 
            // Viewport3DVisual.CanBeInheritanceContext to be false, allowing Camera and
            // Children to only pick up value context from the Viewport3D (this). 
            _viewport3DVisual.CanBeInheritanceContext = false;

            this.AddVisualChild(_viewport3DVisual);
 
            //
 
 

 

            SetValue(ChildrenPropertyKey, _viewport3DVisual.Children);

            _viewport3DVisual.SetInheritanceContextForChildren(this); 
        }
 
        #endregion 

        //------------------------------------------------------ 
        //
        //  Public properties
        //
        //----------------------------------------------------- 
        #region Properties
 
        ///  
        ///     The DependencyProperty for the Camera property.
        ///  
        public static readonly DependencyProperty CameraProperty =
            Viewport3DVisual.CameraProperty.AddOwner(
                typeof(Viewport3D),
                new FrameworkPropertyMetadata( 
                    FreezableOperations.GetAsFrozen(new PerspectiveCamera()),
                    new PropertyChangedCallback(OnCameraChanged))); 
 
        private static void OnCameraChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 
            Viewport3D owner = (Viewport3D) d;

            if (!e.IsASubPropertyChange)
            { 
                owner._viewport3DVisual.Camera = (Camera) e.NewValue;
            } 
        } 

        ///  
        /// Camera for viewing scene.  If no camera is specified, then a default will be provided.
        /// 
        public Camera Camera
        { 
            get { return (Camera) GetValue(CameraProperty); }
            set { SetValue(CameraProperty, value); } 
        } 

        private static readonly DependencyPropertyKey ChildrenPropertyKey = 
            DependencyProperty.RegisterReadOnly(
                "Children",
                typeof(Visual3DCollection),
                typeof(Viewport3D), 
                new FrameworkPropertyMetadata((object) null));
 
        ///  
        /// The 3D children of the Viewport3D
        ///  
        public static readonly DependencyProperty ChildrenProperty = ChildrenPropertyKey.DependencyProperty;

        private static object ChildrenGetValueOverride(DependencyObject d)
        { 
            return ((Viewport3D)d)._viewport3DVisual.Children;
        } 
 
        /// 
        /// The 3D children of this Viewport3D. 
        /// 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public Visual3DCollection Children
        { 
            get { return (Visual3DCollection) GetValue(ChildrenProperty); }
        } 
 
        #endregion
 
        //------------------------------------------------------
        //
        //  Protected methods
        // 
        //------------------------------------------------------
 
        #region Protected methods 

        ///  
        /// Creates AutomationPeer ()
        /// 
        protected override AutomationPeer OnCreateAutomationPeer()
        { 
            return new Viewport3DAutomationPeer(this);
        } 
 
        /// 
        /// Viewport3D arranges its children to fill whatever it is given. 
        /// 
        /// Size that Viewport3D will assume.
        protected override Size ArrangeOverride(Size finalSize)
        { 
            Rect newBounds = new Rect(new Point(), finalSize);
            _viewport3DVisual.Viewport = newBounds; 
 
            return finalSize;
        } 

        /// 
        ///   Derived class must implement to support Visual children. The method must return
        ///    the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1. 
        ///
        ///    By default a Visual does not have any children. 
        /// 
        ///  Remark:
        ///       During this virtual call it is not valid to modify the Visual tree. 
        /// 
        protected override Visual GetVisualChild(int index)
        {
            //added in the constructor so 1 children always exist 
            switch(index)
            { 
                case 0: 
                    return _viewport3DVisual;
 
                default:
                    throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange));
            }
        } 

        ///  
        ///  Derived classes override this property to enable the Visual code to enumerate 
        ///  the Visual children. Derived classes need to return the number of children
        ///  from this method. 
        ///
        ///    By default a Visual does not have any children.
        ///
        ///  Remark: During this virtual method the Visual tree must not be modified. 
        /// 
        protected override int VisualChildrenCount 
        { 
            //children are added in the constructor
            get { return 1; } 
        }
        #endregion Protected methods

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

        private readonly Viewport3DVisual _viewport3DVisual;
 
        #endregion Private Fields
 
        //----------------------------------------------------- 
        //
        //  IAddChild implementation 
        //
        //-----------------------------------------------------

        void IAddChild.AddChild(Object value) 
        {
            if (value == null) 
            { 
                throw new ArgumentNullException("value");
            } 

            Visual3D visual3D = value as Visual3D;

            if (visual3D == null) 
            {
                throw new ArgumentException(SR.Get(SRID.UnexpectedParameterType, value.GetType(), typeof(Visual3D)), "value"); 
            } 

            Children.Add(visual3D); 
        }

        void IAddChild.AddText(string text)
        { 
            // The only text we accept is whitespace, which we ignore.
            XamlSerializerUtil.ThrowIfNonWhiteSpaceInAddText(text, this); 
        } 
    }
} 



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