Code:
/ 4.0 / 4.0 / untmp / 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. 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