WPF实现转圈进度条效果

在设计界面时，有时会遇到进度条，本次讲解WPF如何设计自定义的绕圈进度条，直接上代码：

1、控件界面

<UserControl x:Class="ProgressBarControl"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
       xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
       mc:Ignorable="d" d:DesignHeight="200" d:DesignWidth="300"
       Background="Gray" Loaded="ProgressBarControl_OnLoaded">

  <Grid>
    <Grid.Resources>
      <Style TargetType="Ellipse">
        <Setter Property="Height" Value="{Binding EclipseSize}"></Setter>
        <Setter Property="Width" Value="{Binding EclipseSize}"></Setter>
        <Setter Property="Stretch" Value="Fill"></Setter>
        <!--设置圆的颜色-->
        <Setter Property="Fill" Value="White"></Setter>
      </Style>
    </Grid.Resources>
    <StackPanel  HorizontalAlignment="Center"
      VerticalAlignment="Center">
      <Viewbox Width="{Binding ViewBoxSize}" Height="{Binding ViewBoxSize}"
      HorizontalAlignment="Center"
      VerticalAlignment="Center">
        <Grid x:Name="LayoutRoot"
        Background="Transparent"
        HorizontalAlignment="Center"
        VerticalAlignment="Center">
          <!--此处有canvas的加载和卸载事件-->
          <Canvas x:Name="ProgressBarCanvas" RenderTransformOrigin="0.5,0.5"
          HorizontalAlignment="Center"
          VerticalAlignment="Center" Width="{Binding CanvasSize}"
          Height="{Binding CanvasSize}" Loaded="HandleLoaded"
          Unloaded="HandleUnloaded" >
            <!--画圆-->
            <Canvas.RenderTransform>
              <RotateTransform x:Name="SpinnerRotate" Angle="0" />
            </Canvas.RenderTransform>
          </Canvas>
        </Grid>
      </Viewbox>
    </StackPanel>
  </Grid>
</UserControl> 

2、控件后台逻辑：

控件后台：

/// <summary>
  /// 进度条
  /// </summary>
  public partial class ProgressBarControl : UserControl
  {
    //集成到按指定时间间隔和指定优先级处理的 System.Windows.Threading.Dispatcher 队列中的计时器。
    private DispatcherTimer animationTimer;
    private ProgressBarDataModel _dataModel;
    private int index = 0;
    #region 构造方法与加载
    /// <summary>
    /// 构造方法
    /// </summary>
    public ProgressBarControl()
    {
      InitializeComponent();

    }
    /// <summary>
    /// 加载后刷新
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void ProgressBarControl_OnLoaded(object sender, RoutedEventArgs e)
    {
      animationTimer = new DispatcherTimer(DispatcherPriority.ContextIdle, Dispatcher);
      //指定时间间隔
      animationTimer.Interval = new TimeSpan(0, 0, 0, 0, TimeSpan);
      if (EllipseCount < 1)
      {
        EllipseCount = 12;
      }
      for (int i = 0; i < EllipseCount; i++)
      {
        ProgressBarCanvas.Children.Add(new Ellipse());
      }
      var dataModel = new ProgressBarDataModel()
      {
        CanvasSize = CanvasSize,
        EclipseSize = EllipseSize
      };
      _dataModel = dataModel;
      this.DataContext = dataModel;
    }
    #endregion

    #region 属性
    /// <summary>
    /// 获取或设置圆圈数量
    /// 默认12
    /// </summary>
    public double EllipseCount
    {
      get { return (double)GetValue(EllipseCountProperty); }
      set { SetValue(EllipseCountProperty, value); }
    }
    public static readonly DependencyProperty EllipseCountProperty =
      DependencyProperty.Register("EllipseCount", typeof(double), typeof(ProgressBarControl),
      new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender));

    /// <summary>
    /// 获取或设置圆圈大小
    /// 默认10
    /// </summary>
    public double EllipseSize
    {
      get { return (double)GetValue(EllipseSizeProperty); }
      set { SetValue(EllipseSizeProperty, value); }
    }
    public static readonly DependencyProperty EllipseSizeProperty =
      DependencyProperty.Register("EllipseSize", typeof(double), typeof(ProgressBarControl),
      new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender));

    /// <summary>
    /// 获取或设置面板大小
    /// 默认80
    /// </summary>
    public double CanvasSize
    {
      get { return (double)GetValue(CanvasSizeProperty); }
      set { SetValue(CanvasSizeProperty, value); }
    }
    public static readonly DependencyProperty CanvasSizeProperty =
      DependencyProperty.Register("CanvasSize", typeof(double), typeof(ProgressBarControl),
      new FrameworkPropertyMetadata(80.0, FrameworkPropertyMetadataOptions.AffectsRender));

    /// <summary>
    /// 获取或设置每次旋转角度
    /// 默认10.0
    /// </summary>
    public double StepAngle
    {
      get { return (double)GetValue(StepAngleProperty); }
      set { SetValue(StepAngleProperty, value); }
    }

    public static readonly DependencyProperty StepAngleProperty =
      DependencyProperty.Register("StepAngle", typeof(double), typeof(ProgressBarControl),
      new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender));
    /// <summary>
    /// 获取或设置每次旋转间隔时间（毫秒）
    /// 默认100毫秒
    /// </summary>
    public int TimeSpan
    {
      get { return (int)GetValue(TimeSpanProperty); }
      set { SetValue(TimeSpanProperty, value); }
    }
    public static readonly DependencyProperty TimeSpanProperty =
      DependencyProperty.Register("TimeSpan", typeof(int), typeof(ProgressBarControl),
      new FrameworkPropertyMetadata(100, FrameworkPropertyMetadataOptions.AffectsRender));

    #endregion

    #region 方法
    /// <summary>
    /// Canvas加载
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void HandleLoaded(object sender, RoutedEventArgs e)
    {
      //设置设置圆的位置和旋转角度
      SetEclipsePosition(_dataModel);
      //DesignerProperties  提供用于与设计器进行通信的附加属性。
      if (!DesignerProperties.GetIsInDesignMode(this))
      {
        if (this.Visibility == System.Windows.Visibility.Visible)
        {
          //超过计时器间隔时发生。
          animationTimer.Tick += HandleAnimationTick;
          animationTimer.Start();
        }
      }
    }

    /// <summary>
    /// 设置圆的位置和旋转角度
    /// </summary>
    private void SetEclipsePosition(ProgressBarDataModel dataModel)
    {
      //圆周长就是：C = π * d 或者C=2*π*r（其中d是圆的直径，r是圆的半径）
      double r =dataModel.R;

      var children=ProgressBarCanvas.Children;
      int count = children.Count;
      double step = (Math.PI * 2) / count;

      //根据圆中正弦、余弦计算距离
      int index = 0;
      foreach (var element in children)
      {
        var ellipse = element as Ellipse;
        //透明度
        var opacity = Convert.ToDouble(index)/(count - 1);
        ellipse.SetValue(UIElement.OpacityProperty, opacity<0.05?0.05:opacity);
        //距离
        double left = r + Math.Sin(step*index)*r;
        ellipse.SetValue(Canvas.LeftProperty,left);
        double top = r - Math.Cos(step*index)*r;
        ellipse.SetValue(Canvas.TopProperty, top);

        index++;
      }
    }

    /// <summary>
    /// Canvas卸载时
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void HandleUnloaded(object sender, RoutedEventArgs e)
    {
      animationTimer.Stop();
      //除去委托
      animationTimer.Tick -= HandleAnimationTick;
    }

    /// <summary>
    /// 超过计时器间隔时发生。
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void HandleAnimationTick(object sender, EventArgs e)
    {
      //设置旋转角度
      SpinnerRotate.Angle = (SpinnerRotate.Angle + StepAngle) % 360;
    }
    #endregion
}

数据Model类：

/// <summary>
  /// 进度条Model类
  /// </summary>
  public class ProgressBarDataModel
  {
    public double EclipseSize { get; set; }
    public double CanvasSize { get; set; }
    public double ViewBoxSize
    {
      get
      {
        double length = Convert.ToDouble(CanvasSize) - Convert.ToDouble(EclipseSize);
        return length;
      }
    }
    public double EclipseLeftLength
    {
      get
      {
        double length = Convert.ToDouble(CanvasSize) / 2;
        return length;
      }
    }
    public double R
    {
      get
      {
        double length = (Convert.ToDouble(CanvasSize) - Convert.ToDouble(EclipseSize)) / 2;
        return length;
      }
    }
}

3、取用控件

<control:ProgressBarControl CanvasSize="100" EllipseCount="10" EllipseSize="10" StepAngle="36" TimeSpan="60"/>

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