HitTestDrawingContextWalker.cs source code in C# .NET

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Code:

/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / HitTestDrawingContextWalker.cs / 1 / HitTestDrawingContextWalker.cs

                            //---------------------------------------------------------------------------- 
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
// File: HitTestDrawingContextWalker.cs 
//
// Description: This file contains the implementation of HitTestDrawingContextWalker. 
//              This DrawingContextWalker is used to perform hit tests on renderdata. 
//
// History: 
//  04/10/2004 : [....] - Created it.
//
//---------------------------------------------------------------------------
 
using MS.Internal;
using System; 
using System.ComponentModel; 
using System.Collections;
using System.Collections.Generic; 
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows; 
using System.Windows.Media;
using System.Windows.Media.Animation; 
using System.Windows.Media.Composition; 
using System.Windows.Media.Imaging;
 
namespace System.Windows.Media
{
    /// 
    /// HitTestDrawingContextWalker - a DrawingContextWalker which will perform a point or 
    /// geometry based hit test on the contents of a render data.
    ///  
    internal abstract class HitTestDrawingContextWalker: DrawingContextWalker 
    {
        ///  
        /// Constructor
        /// 
        internal HitTestDrawingContextWalker()
        { 
        }
 
        ///  
        /// IsHit Property - Returns whether the point or geometry intersected the drawing instructions.
        ///  
        internal abstract bool IsHit { get; }

        abstract internal IntersectionDetail IntersectionDetail { get; }
 
        #region Static Drawing Context Methods
 
        ///  
        ///     DrawLine -
        ///     Draws a line with the specified pen. 
        ///     Note that this API does not accept a Brush, as there is no area to fill.
        /// 
        ///  The Pen with which to stroke the line. 
        ///  The start Point for the line.  
        ///  The end Point for the line. 
        public override void DrawLine( 
            Pen pen, 
            Point point0,
            Point point1) 
        {
            //
            DrawGeometry(null /* brush */, pen, new LineGeometry(point0, point1));
        } 

        ///  
        ///     DrawRectangle - 
        ///     Draw a rectangle with the provided Brush and/or Pen.
        ///     If both the Brush and Pen are null this call is a no-op. 
        /// 
        /// 
        ///     The Brush with which to fill the rectangle.
        ///     This is optional, and can be null, in which case no fill is performed. 
        /// 
        ///  
        ///     The Pen with which to stroke the rectangle. 
        ///     This is optional, and can be null, in which case no stroke is performed.
        ///  
        ///  The Rect to fill and/or stroke. 
        public override void DrawRectangle(
            Brush brush,
            Pen pen, 
            Rect rectangle)
        { 
            // 
            DrawGeometry(brush, pen, new RectangleGeometry(rectangle));
        } 

        /// 
        ///     DrawRoundedRectangle -
        ///     Draw a rounded rectangle with the provided Brush and/or Pen. 
        ///     If both the Brush and Pen are null this call is a no-op.
        ///  
        ///  
        ///     The Brush with which to fill the rectangle.
        ///     This is optional, and can be null, in which case no fill is performed. 
        /// 
        /// 
        ///     The Pen with which to stroke the rectangle.
        ///     This is optional, and can be null, in which case no stroke is performed. 
        /// 
        ///  The Rect to fill and/or stroke.  
        ///  
        ///     The radius in the X dimension of the rounded corners of this
        ///     rounded Rect.  This value will be clamped to the range [0..rectangle.Width/2] 
        /// 
        /// 
        ///     The radius in the Y dimension of the rounded corners of this
        ///     rounded Rect.  This value will be clamped to the range [0..rectangle.Height/2]. 
        /// 
        public override void DrawRoundedRectangle( 
            Brush brush, 
            Pen pen,
            Rect rectangle, 
            Double radiusX,
            Double radiusY)
        {
            // 
            DrawGeometry(brush, pen, new RectangleGeometry(rectangle, radiusX, radiusY));
        } 
 
        /// 
        ///     DrawEllipse - 
        ///     Draw an ellipse with the provided Brush and/or Pen.
        ///     If both the Brush and Pen are null this call is a no-op.
        /// 
        ///  
        ///     The Brush with which to fill the ellipse.
        ///     This is optional, and can be null, in which case no fill is performed. 
        ///  
        /// 
        ///     The Pen with which to stroke the ellipse. 
        ///     This is optional, and can be null, in which case no stroke is performed.
        /// 
        /// 
        ///     The center of the ellipse to fill and/or stroke. 
        /// 
        ///  
        ///     The radius in the X dimension of the ellipse. 
        ///     The absolute value of the radius provided will be used.
        ///  
        /// 
        ///     The radius in the Y dimension of the ellipse.
        ///     The absolute value of the radius provided will be used.
        ///  
        public override void DrawEllipse(
            Brush brush, 
            Pen pen, 
            Point center,
            Double radiusX, 
            Double radiusY)
        {
            //
            DrawGeometry(brush, pen, new EllipseGeometry(center, radiusX, radiusY)); 
        }
 
 
        /// 
        ///     DrawImage - 
        ///     Draw an Image into the region specified by the Rect.
        ///     The Image will potentially be stretched and distorted to fit the Rect.
        ///     For more fine grained control, consider filling a Rect with an ImageBrush via
        ///     DrawRectangle. 
        /// 
        ///  The ImageSource to draw.  
        ///  
        ///     The Rect into which the ImageSource will be fit.
        ///  
        public override void DrawImage(
            ImageSource imageSource,
            Rect rectangle)
        { 
            //
            ImageBrush imageBrush = new ImageBrush(); 
 
            // The ImageSource provided will be shared between the original location and the new ImageBrush
            // we're creating - this will by default break property inheritance, dynamic resource references 
            // and databinding.  To prevent this, we mark the new ImageBrush.CanBeInheritanceContext == false.
            imageBrush.CanBeInheritanceContext = false;

            imageBrush.ImageSource = imageSource; 

            DrawGeometry(imageBrush, null /* pen */, new RectangleGeometry(rectangle)); 
        } 

        ///  
        ///     DrawVideo -
        ///     Draw a Video into the region specified by the Rect.
        ///     The Video will potentially be stretched and distorted to fit the Rect.
        ///     For more fine grained control, consider filling a Rect with a VideoBrush via 
        ///     DrawRectangle.
        ///  
        ///  The MediaPlayer to draw.  
        /// 
        ///     The Rect into which the MediaPlayer will be fit. 
        /// 
        public override void DrawVideo(
            MediaPlayer video,
            Rect rectangle) 
        {
            // Hit test a rect with a VideoBrush once it exists. 
            // DrawGeometry(new VideoBrush(video), null /* pen */, new RectangleGeometry(rectangle)); 

            // 
            DrawGeometry(Brushes.Black, null /* pen */, new RectangleGeometry(rectangle));
        }

        #endregion Static Drawing Context Methods 

        #region Protected Fields 
 
        // Indicates if the Visual fully contains the hit-test point or geometry
        protected bool _contains; 

        #endregion Protected Fields
    }
} 


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

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