WPF: Round Progress Bar

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Introduction

The standard WPF progress bar is very boring, and doesn't allows lot of customizations. I created a round progress bar like the ones that I always see in the web and in Flash applications.

Here is the simple idea of how to implement such a control. I used two Canvases, a TextBox and 12 Rectangles to create the progress bar.

Here is the XAML code of the UserControl:

<UserControl x:Class="RounderProgressBar.RounderProgressBarControl"  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml 
    Height="400" Width="400">

    <UserControl.Resources>  
        <Style x:Key="canvasStyle" TargetType="{x:Type Canvas}"> 
            <Setter Property="Background" Value="Transparent"/> 
        </Style>  
        <Style x:Key ="rectangle" 
                     TargetType="{x:Type Rectangle}"> 
            <Setter Property="Width" Value="35"/> 
            <Setter Property="Height" Value="100"/> 
            <Setter Property="Fill" Value="LightBlue"/> 
            <Setter Property="Canvas.Left" Value="190"/> 
            <Setter Property="Canvas.Top" Value="0"/> 
            <Setter Property="RadiusX" Value="10"/> 
            <Setter Property="RadiusY" Value="10"/> 
        </Style> 
        <Style x:Key="percents" TargetType="{x:Type TextBox}">
            <Setter Property="FontSize" Value="20" />
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="BorderBrush" Value="Transparent"/>
            <Setter Property="IsReadOnly" Value="true"/>
        </Style>      
    </UserControl.Resources> 

    <Canvas RenderTransformOrigin="0.5,0.5" 
             Style="{StaticResource canvasStyle}"> 
        <TextBox Name="tbPercents" 
          Style="{StaticResource percents}"  
          Canvas.Left="172" Canvas.Top="189" 
          TextChanged="tblPercents_TextChanged"> 
            100% 
        </TextBox>         
        <Canvas Name="rotationCanvas" 
               RenderTransformOrigin="0.5,0.5" 
               Style="{StaticResource canvasStyle}"> 
            <Rectangle  Style="{StaticResource rectangle}"> 
            </Rectangle> 
            <Rectangle Opacity="0.92" 
                    Style="{StaticResource rectangle}"> 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="30" 
                            CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.84" 
                    Style="{StaticResource rectangle}"> 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="60" 
                           CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.76" 
                     Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="90" 
                          CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.66" 
                   Style="{StaticResource rectangle}"> 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="120" 
                         CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.58" 
                      Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="150" 
                           CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.5" 
                      Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="180" 
                          CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.42" 
                    Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="210" 
                      CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.34" 
                      Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="240" 
                      CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.26" 
                  Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="270" 
                      CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.16" 
                 Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="300" 
                      CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Rectangle Opacity="0.08" 
                   Style="{StaticResource rectangle}" > 
                <Rectangle.RenderTransform> 
                    <RotateTransform Angle="330" 
                       CenterX="10" CenterY="200"/> 
                </Rectangle.RenderTransform> 
            </Rectangle> 
            <Canvas.RenderTransform> 
                <RotateTransform x:Name="SpinnerRotate"  
                   Angle="0" CenterX="200" 
                   CenterY="200" /> 
            </Canvas.RenderTransform> 
        </Canvas> 
    </Canvas> 
</UserControl>

To add some animation to the progress bar, I use a System.Timer and rotate the second Canvas on 30 angles every 100 milliseconds.

Here is the code in С#:

using System.Timers; 
using System.Windows; 
using System.Windows.Controls;

namespace RounderProgressBar 
{ 
    /// <summary> 
    /// Interaction logic for RounderProgressBar.xaml 
    /// </summary> 
    public partial class RounderProgressBarControl : UserControl 
    { 
        private const string PERCENTS_TEXT = "{0}%"; 
        private delegate void VoidDelegete(); 
        private Timer timer; 
        private bool loaded; 
        private int progress; 

        public RounderProgressBarControl() 
        { 
            InitializeComponent(); 
            Loaded += OnLoaded; 
        }

        void OnLoaded(object sender, RoutedEventArgs e) 
        { 
            timer = new Timer(100); 
            timer.Elapsed += OnTimerElapsed; 
            timer.Start(); 
            loaded = true; 
        }

        void OnTimerElapsed(object sender, ElapsedEventArgs e) 
        { 
            rotationCanvas.Dispatcher.Invoke 
            ( 
                new VoidDelegete( 
                    delegate 
                        { 
                            SpinnerRotate.Angle += 30; 
                            if (SpinnerRotate.Angle == 360) 
                            { 
                                SpinnerRotate.Angle = 0; 
                            } 
                        } 
                    ), 
                null 
            );  
        }

        private void tblPercents_TextChanged(object sender, 
                     TextChangedEventArgs e) 
        { 
            if (loaded) 
            { 
                Canvas.SetLeft(tbPercents, 
                  (rotationCanvas.ActualHeight - tbPercents.ActualWidth) / 2); 
                Canvas.SetTop(tbPercents, 
                  (rotationCanvas.ActualHeight - tbPercents.ActualHeight) / 2);    
            } 
        } 

        private void UpdateProgress() 
        { 
            tbPercents.Text = string.Format(PERCENTS_TEXT, progress); 
        } 

        public int Progress 
        { 
            get { return progress; } 
            set 
            { 
                progress = value; 
                UpdateProgress(); 
            } 
        } 
    } 
}

You can easily change the percentage info on the progress bar using the Progress property.

public int Progress 
{  
    get { return progress; } 

    set 
    { 
        progress = value; 
        UpdateProgress(); 
    }  
}

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