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Progress Bar Google Chrome

, 29 May 2011
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A Google Chrome themed progress, with customizable gradients.

ProgressBarPreview.png

Introduction

This article demonstrates creating a Google Chrome themed ProgressBar control from scratch.

Background

Any ProgressBar control relies on a value and its graphical representation. Google Chrome downloader has a circular representation of its progress.

Using the Code

ChromeProgressBar is designed the same way the Chrome ProgressBar works. This converts the progress values into a circular graphical representation.

private void PaintProgress(PaintEventArgs e)
{
   using( SolidBrush progressBrush = new SolidBrush(this.ProgressColor))
   {
       Rectangle rect = LayoutInternal.ProgressRectangle;

       rect.Inflate(-2, -2);
       rect.Height -= 2; rect.Width -= 2;

       float startAngle = -90;
       float sweepAngle = Progress / 100 * 360;
       
       e.Graphics.FillPie(progressBrush, rect, startAngle, sweepAngle);
   }
}

Here is how the circle and the segments are drawn, with the graphics path and four lines. The clipping region of the Graphics object is adjusted to clip the lines that run beyond the circle.

private void PaintBorder(PaintEventArgs e)
{
    GraphicsPath borderPath = new GraphicsPath();
    Rectangle progressRect = LayoutInternal.ProgressRectangle;
    borderPath.AddArc(progressRect, 0, 360);
    ....
    ....
    ....

    using (Pen borderPen = new Pen(this.BorderColor, 2))
    {
        e.Graphics.DrawPath(borderPen, borderPath);

        e.Graphics.DrawLine(borderPen,
            new Point(progressRect.Left + progressRect.Width / 2, progressRect.Top),
            new Point(progressRect.Left + progressRect.Width / 2, progressRect.Bottom));

        e.Graphics.DrawLine(borderPen,
            new Point(progressRect.Left, progressRect.Top + progressRect.Height / 2),
            new Point(progressRect.Right, progressRect.Top + progressRect.Height / 2));

        e.Graphics.DrawLine(borderPen,
             new Point(progressRect.Left ,progressRect.Top),
             new Point(progressRect.Right,progressRect.Bottom));

        e.Graphics.DrawLine(borderPen,
            new Point(progressRect.Left, progressRect.Bottom),
            new Point(progressRect.Right, progressRect.Top ));
    }

    e.Graphics.Clip = clip;
}

Points of Interest

Take a look at the InternalLayout class to see how the control layouts individual items on the control. The nested Internal Layout class takes ChromeProgressBar as an argument and provides all the necessary layout information required for the control leaving the painting process alone to the ChromeProgressBar.

Hope this will you with a good start in creating controls. Please do leave your valuable comments and suggestions.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

VallarasuS
Software Developer
India India
I code, learn, listen, and some day in a near future be a proud farmer.
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Comments and Discussions

 
GeneralMy vote of 4 Pinmemberzuojunyuan23-Nov-11 16:16 
Generalanti-aliasing PinmemberUnruled Boy29-May-11 23:58 
GeneralRe: anti-aliasing Pinmembervallarasus30-May-11 0:46 
GeneralToo short for an article PinmemberVenkatesh Mookkan29-May-11 18:53 
GeneralArticle is a bit light PinmemberDaveAuld29-May-11 2:59 
GeneralRe: Article is a bit light Pinmembervallarasus29-May-11 8:11 
GeneralRe: Article is a bit light PinmemberVenkatesh Mookkan29-May-11 18:52 
GeneralRe: Article is a bit light Pinmembervallarasus1-Jun-11 7:16 

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