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 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" 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></param> /// <param></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></param> /// <param></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></param> /// <param></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></param> /// <param></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：