/// <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}