ProgressBarBrushConverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Themes / Shared / Microsoft / Windows / Themes / ProgressBarBrushConverter.cs / 1305600 / ProgressBarBrushConverter.cs
                        
                        
                            //---------------------------------------------------------------------------- 
// File: ProgressBarBrushConverter.cs
//
// Description:
// Converts a brush into a DrawingBrush used to display the "block" style 
// progress bar
// 
// History: 
//  06/28/2004 - t-sergin - Created
// 
// Copyright (C) 2004,2005 by Microsoft Corporation.  All rights reserved.
//
//---------------------------------------------------------------------------
using System; 
using System.Globalization;
using System.Threading; 
 
using System.Windows;
using System.Windows.Controls.Primitives; 
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Media.Animation;
 
namespace Microsoft.Windows.Themes
{ 
    ///  
    /// The ProgressBarBrushConverter class
    ///  
    public class ProgressBarBrushConverter : IMultiValueConverter
    {
        /// 
        ///      Creates the brush for the ProgressBar 
        /// 
        /// ForegroundBrush, IsIndeterminate, Indicator Width, Indicator Height, Track Width 
        ///  
        /// 
        ///  
        /// Brush for the ProgressBar
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            // 
            // Parameter Validation
            // 
            Type doubleType = typeof(double); 
            if (values == null ||
                (values.Length != 5) || 
                (values[0] == null)  ||
                (values[1] == null)  ||
                (values[2] == null)  ||
                (values[3] == null) || 
                (values[4] == null) ||
                !typeof(Brush).IsAssignableFrom(values[0].GetType()) || 
                !typeof(bool).IsAssignableFrom(values[1].GetType()) || 
                !doubleType.IsAssignableFrom(values[2].GetType()) ||
                !doubleType.IsAssignableFrom(values[3].GetType()) || 
                !doubleType.IsAssignableFrom(values[4].GetType()))
            {
                return null;
            } 

            // 
            // Conversion 
            //
 
            Brush brush = (Brush)values[0];
            bool isIndeterminate = (bool)values[1];
            double width = (double)values[2];
            double height = (double)values[3]; 
            double trackWidth = (double)values[4];
 
            // if an invalid height, return a null brush 
            if (width <= 0.0 || Double.IsInfinity(width) || Double.IsNaN(width) ||
                height <= 0.0 || Double.IsInfinity(height) || Double.IsNaN(height) ) 
            {
                return null;
            }
 

            DrawingBrush newBrush = new DrawingBrush(); 
 
            // Set the viewport and viewbox to the size of the progress region
            newBrush.Viewport = newBrush.Viewbox = new Rect(0, 0, width, height); 
            newBrush.ViewportUnits = newBrush.ViewboxUnits = BrushMappingMode.Absolute;

            newBrush.TileMode = TileMode.None;
            newBrush.Stretch = Stretch.None; 

            DrawingGroup myDrawing = new DrawingGroup(); 
            DrawingContext myDrawingContext = myDrawing.Open(); 

            double drawnWidth = 0.0; // The total width drawn to the brush so far 

            double blockWidth = 6.0;
            double blockGap = 2.0;
            double blockTotal = blockWidth + blockGap; 

            // For the indeterminate case, just draw a portion of the width 
            // And animate the brush 
            if (isIndeterminate)
            { 
                int blocks = (int)Math.Ceiling(width / blockTotal);

                // The left (X) starting point of the brush
                double left = -blocks * blockTotal; 

                // Only draw 30% of the blocks 
                double indeterminateWidth = width * .3; 

                // Generate the brush so it wraps correctly 
                // The brush is larger than the rectangle to fill like so:
                //                +-------------+
                // [] [] [] __ __ |[] [] [] __ _|
                //                +-------------+ 
                // Translate Brush =>>
                // To have the marquee line up on the left as the blocks are scrolled off to the right 
                // we need to have the second set of blocks offset from the first by the width of the rect 
                newBrush.Viewport = newBrush.Viewbox = new Rect(left, 0, indeterminateWidth - left, height);
 
                // Add an animated translate transfrom
                TranslateTransform translation = new TranslateTransform();

                double milliseconds = blocks * 100; // 100 milliseconds on each position 

                DoubleAnimationUsingKeyFrames animation = new DoubleAnimationUsingKeyFrames(); 
                animation.Duration = new Duration(TimeSpan.FromMilliseconds(milliseconds));  // Repeat every 3 seconds 
                animation.RepeatBehavior = RepeatBehavior.Forever;
 
                // Add a keyframe to translate by each block
                for (int i = 1; i <= blocks; i++)
                {
                    double x = i * blockTotal; 

                    animation.KeyFrames.Add(new DiscreteDoubleKeyFrame(x, KeyTime.Uniform)); 
                } 

                // Set the animation to the XProperty 
                translation.BeginAnimation(TranslateTransform.XProperty, animation);

                // Set the animated translation on the brush
                newBrush.Transform = translation; 

                // Draw the Blocks to the left of the brush that are translated into view 
                // during the animation 

                // While able to draw complete blocks, 
                while ((drawnWidth + blockWidth) < indeterminateWidth)
                {
                    // Draw a block
                    myDrawingContext.DrawRectangle( 
                                brush,
                                null, 
                                new Rect(left + drawnWidth, 0, blockWidth, height)); 

                    drawnWidth += blockTotal; 
                }

                width = indeterminateWidth; //only need to draw 30% of the blocks
                drawnWidth = 0.0; //reset drawn width and draw the left blocks 
            }
 
            // Draw as many blocks 
            // While able to draw complete blocks,
            while ( (drawnWidth + blockWidth) < width ) 
            {
                // Draw a block
                myDrawingContext.DrawRectangle(
                            brush, 
                            null,
                            new Rect(drawnWidth, 0, blockWidth, height)); 
 
                drawnWidth += blockTotal;
            } 

            double remainder = width - drawnWidth;
            // Draw portion of last block when ProgressBar is 100% (ie indicatorWidth == trackWidth)
            if (!isIndeterminate && remainder > 0.0 && Math.Abs(width - trackWidth) < 1.0e-5) 
            {
                // Draw incomplete block to fill progress indicator area 
                myDrawingContext.DrawRectangle( 
                            brush,
                            null, 
                            new Rect(drawnWidth, 0, remainder, height));
            }

            myDrawingContext.Close(); 
            newBrush.Drawing = myDrawing;
 
            return newBrush; 
        }
 
        /// 
        /// Not Supported
        /// 
        /// value, as produced by target 
        /// target types
        /// converter parameter 
        /// culture information 
        /// Nothing
        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) 
        {
            return null;
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
// File: ProgressBarBrushConverter.cs
//
// Description:
// Converts a brush into a DrawingBrush used to display the "block" style 
// progress bar
// 
// History: 
//  06/28/2004 - t-sergin - Created
// 
// Copyright (C) 2004,2005 by Microsoft Corporation.  All rights reserved.
//
//---------------------------------------------------------------------------
using System; 
using System.Globalization;
using System.Threading; 
 
using System.Windows;
using System.Windows.Controls.Primitives; 
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Media.Animation;
 
namespace Microsoft.Windows.Themes
{ 
    ///  
    /// The ProgressBarBrushConverter class
    ///  
    public class ProgressBarBrushConverter : IMultiValueConverter
    {
        /// 
        ///      Creates the brush for the ProgressBar 
        /// 
        /// ForegroundBrush, IsIndeterminate, Indicator Width, Indicator Height, Track Width 
        ///  
        /// 
        ///  
        /// Brush for the ProgressBar
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            // 
            // Parameter Validation
            // 
            Type doubleType = typeof(double); 
            if (values == null ||
                (values.Length != 5) || 
                (values[0] == null)  ||
                (values[1] == null)  ||
                (values[2] == null)  ||
                (values[3] == null) || 
                (values[4] == null) ||
                !typeof(Brush).IsAssignableFrom(values[0].GetType()) || 
                !typeof(bool).IsAssignableFrom(values[1].GetType()) || 
                !doubleType.IsAssignableFrom(values[2].GetType()) ||
                !doubleType.IsAssignableFrom(values[3].GetType()) || 
                !doubleType.IsAssignableFrom(values[4].GetType()))
            {
                return null;
            } 

            // 
            // Conversion 
            //
 
            Brush brush = (Brush)values[0];
            bool isIndeterminate = (bool)values[1];
            double width = (double)values[2];
            double height = (double)values[3]; 
            double trackWidth = (double)values[4];
 
            // if an invalid height, return a null brush 
            if (width <= 0.0 || Double.IsInfinity(width) || Double.IsNaN(width) ||
                height <= 0.0 || Double.IsInfinity(height) || Double.IsNaN(height) ) 
            {
                return null;
            }
 

            DrawingBrush newBrush = new DrawingBrush(); 
 
            // Set the viewport and viewbox to the size of the progress region
            newBrush.Viewport = newBrush.Viewbox = new Rect(0, 0, width, height); 
            newBrush.ViewportUnits = newBrush.ViewboxUnits = BrushMappingMode.Absolute;

            newBrush.TileMode = TileMode.None;
            newBrush.Stretch = Stretch.None; 

            DrawingGroup myDrawing = new DrawingGroup(); 
            DrawingContext myDrawingContext = myDrawing.Open(); 

            double drawnWidth = 0.0; // The total width drawn to the brush so far 

            double blockWidth = 6.0;
            double blockGap = 2.0;
            double blockTotal = blockWidth + blockGap; 

            // For the indeterminate case, just draw a portion of the width 
            // And animate the brush 
            if (isIndeterminate)
            { 
                int blocks = (int)Math.Ceiling(width / blockTotal);

                // The left (X) starting point of the brush
                double left = -blocks * blockTotal; 

                // Only draw 30% of the blocks 
                double indeterminateWidth = width * .3; 

                // Generate the brush so it wraps correctly 
                // The brush is larger than the rectangle to fill like so:
                //                +-------------+
                // [] [] [] __ __ |[] [] [] __ _|
                //                +-------------+ 
                // Translate Brush =>>
                // To have the marquee line up on the left as the blocks are scrolled off to the right 
                // we need to have the second set of blocks offset from the first by the width of the rect 
                newBrush.Viewport = newBrush.Viewbox = new Rect(left, 0, indeterminateWidth - left, height);
 
                // Add an animated translate transfrom
                TranslateTransform translation = new TranslateTransform();

                double milliseconds = blocks * 100; // 100 milliseconds on each position 

                DoubleAnimationUsingKeyFrames animation = new DoubleAnimationUsingKeyFrames(); 
                animation.Duration = new Duration(TimeSpan.FromMilliseconds(milliseconds));  // Repeat every 3 seconds 
                animation.RepeatBehavior = RepeatBehavior.Forever;
 
                // Add a keyframe to translate by each block
                for (int i = 1; i <= blocks; i++)
                {
                    double x = i * blockTotal; 

                    animation.KeyFrames.Add(new DiscreteDoubleKeyFrame(x, KeyTime.Uniform)); 
                } 

                // Set the animation to the XProperty 
                translation.BeginAnimation(TranslateTransform.XProperty, animation);

                // Set the animated translation on the brush
                newBrush.Transform = translation; 

                // Draw the Blocks to the left of the brush that are translated into view 
                // during the animation 

                // While able to draw complete blocks, 
                while ((drawnWidth + blockWidth) < indeterminateWidth)
                {
                    // Draw a block
                    myDrawingContext.DrawRectangle( 
                                brush,
                                null, 
                                new Rect(left + drawnWidth, 0, blockWidth, height)); 

                    drawnWidth += blockTotal; 
                }

                width = indeterminateWidth; //only need to draw 30% of the blocks
                drawnWidth = 0.0; //reset drawn width and draw the left blocks 
            }
 
            // Draw as many blocks 
            // While able to draw complete blocks,
            while ( (drawnWidth + blockWidth) < width ) 
            {
                // Draw a block
                myDrawingContext.DrawRectangle(
                            brush, 
                            null,
                            new Rect(drawnWidth, 0, blockWidth, height)); 
 
                drawnWidth += blockTotal;
            } 

            double remainder = width - drawnWidth;
            // Draw portion of last block when ProgressBar is 100% (ie indicatorWidth == trackWidth)
            if (!isIndeterminate && remainder > 0.0 && Math.Abs(width - trackWidth) < 1.0e-5) 
            {
                // Draw incomplete block to fill progress indicator area 
                myDrawingContext.DrawRectangle( 
                            brush,
                            null, 
                            new Rect(drawnWidth, 0, remainder, height));
            }

            myDrawingContext.Close(); 
            newBrush.Drawing = myDrawing;
 
            return newBrush; 
        }
 
        /// 
        /// Not Supported
        /// 
        /// value, as produced by target 
        /// target types
        /// converter parameter 
        /// culture information 
        /// Nothing
        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) 
        {
            return null;
        }
    } 
}

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

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