PageVisual.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / PtsHost / PageVisual.cs / 1 / PageVisual.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: PageVisual.cs 
//
// Description: Visual representing a PTS page. 
// 
// History:
//  11/11/2003 : [....] - created. 
//
//---------------------------------------------------------------------------
using System;
using System.Diagnostics; 
using System.Collections.Generic;
using System.Collections.ObjectModel; 
using System.Windows; 
using System.Windows.Controls;
using System.Windows.Media; 
using System.Windows.Threading;

namespace MS.Internal.PtsHost
{ 
    // ---------------------------------------------------------------------
    // Visual representing a PTS page. 
    // --------------------------------------------------------------------- 
    internal class PageVisual : DrawingVisual, IContentHost
    { 
        // ------------------------------------------------------------------
        // Create a visual representing a PTS page.
        // -----------------------------------------------------------------
        internal PageVisual(FlowDocumentPage owner) 
        {
            _owner = new WeakReference(owner); 
        } 

        // ------------------------------------------------------------------ 
        // Set information about background that is necessary for rendering
        // process.
        //
        //      backgroundBrush - The background brush used for background. 
        //      renderBounds - Render bounds of the visual.
        // ------------------------------------------------------------------ 
        internal void DrawBackground(Brush backgroundBrush, Rect renderBounds) 
        {
            if (_backgroundBrush != backgroundBrush || _renderBounds != renderBounds) 
            {
                _backgroundBrush = backgroundBrush;
                _renderBounds = renderBounds;
 
                // Open DrawingContext and draw background.
                // If background is not set, Open will clean the render data, but it 
                // will preserve visual children. 
                using (DrawingContext dc = RenderOpen())
                { 
                    if (_backgroundBrush != null)
                    {
                        dc.DrawRectangle(_backgroundBrush, null, _renderBounds);
                    } 
                    else
                    { 
                        dc.DrawRectangle(Brushes.Transparent, null, _renderBounds); 
                    }
                } 
            }
        }

        // ----------------------------------------------------------------- 
        // Get/Set visual child.
        // ------------------------------------------------------------------ 
        internal Visual Child 
        {
            get 
            {
                VisualCollection vc = this.Children;
                Debug.Assert(vc.Count <= 1);
                return (vc.Count == 0) ? null : vc[0]; 
            }
            set 
            { 
                VisualCollection vc = this.Children;
                Debug.Assert(vc.Count <= 1); 
                if (vc.Count == 0)
                {
                    vc.Add(value);
                } 
                else if (vc[0] != value)
                { 
                    vc[0] = value; 
                }
                // else Visual child is the same as already stored; do nothing. 
            }
        }

        // ----------------------------------------------------------------- 
        // Clear its DrawingContext
        // Opening and closing a DrawingContext, clears it. 
        // ----------------------------------------------------------------- 
        internal void ClearDrawingContext()
        { 
            DrawingContext ctx = this.RenderOpen();
            if(ctx != null)
                ctx.Close();
        } 

        //------------------------------------------------------------------- 
        // 
        //  IContentHost Members
        // 
        //--------------------------------------------------------------------

        #region IContentHost Members
 
        /// 
        ///  
        ///  
        IInputElement IContentHost.InputHitTest(Point point)
        { 
            IContentHost host = _owner.Target as IContentHost;
            if (host != null)
            {
                return host.InputHitTest(point); 
            }
            return null; 
        } 

        ///  
        /// 
        /// 
        ReadOnlyCollection IContentHost.GetRectangles(ContentElement child)
        { 
            IContentHost host = _owner.Target as IContentHost;
            if (host != null) 
            { 
                return host.GetRectangles(child);
            } 
            return new ReadOnlyCollection(new List(0));
        }

        ///  
        /// 
        ///  
        IEnumerator IContentHost.HostedElements 
        {
            get 
            {
                IContentHost host = _owner.Target as IContentHost;
                if (host != null)
                { 
                    return host.HostedElements;
                } 
                return null; 
            }
        } 

        /// 
        /// 
        ///  
        void IContentHost.OnChildDesiredSizeChanged(UIElement child)
        { 
            IContentHost host = _owner.Target as IContentHost; 
            if (host != null)
            { 
                host.OnChildDesiredSizeChanged(child);
            }
        }
 
        #endregion IContentHost Members
 
        // ----------------------------------------------------------------- 
        // Reference to DocumentPage that owns this visual.
        // ------------------------------------------------------------------ 
        private readonly WeakReference _owner;

        // ------------------------------------------------------------------
        // Brush used for background rendering. 
        // -----------------------------------------------------------------
 
        private Brush _backgroundBrush; 

        // ------------------------------------------------------------------ 
        // Render bounds.
        // -----------------------------------------------------------------
        private Rect _renderBounds;
    } 
}

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

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