使用WPF怎么編寫一個轉圈進度條效果

使用WPF怎么編寫一個轉圈進度條效果？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。

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>
        <!--設置圓的顏色-->
        <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">
          <!--此處有canvas的加載和卸載事件-->
          <Canvas x:Name="ProgressBarCanvas" RenderTransformOrigin="0.5,0.5" 
          HorizontalAlignment="Center" 
          VerticalAlignment="Center" Width="{Binding CanvasSize}" 
          Height="{Binding CanvasSize}" Loaded="HandleLoaded" 
          Unloaded="HandleUnloaded" >
            <!--畫圓-->            
            <Canvas.RenderTransform>
              <RotateTransform x:Name="SpinnerRotate" Angle="0" />
            </Canvas.RenderTransform>
          </Canvas>
        </Grid>
      </Viewbox>
    </StackPanel>
  </Grid>
</UserControl>

2、控件后臺邏輯：

 控件后臺：

/// <summary>
  /// 進度條
  /// </summary>
  public partial class ProgressBarControl : UserControl
  {
    //集成到按指定時間間隔和指定優先級處理的 System.Windows.Threading.Dispatcher 隊列中的計時器。
    private DispatcherTimer animationTimer;
    private ProgressBarDataModel _dataModel;
    private int index = 0;
    #region 構造方法與加載
    /// <summary>
    /// 構造方法
    /// </summary>
    public ProgressBarControl()
    {
      InitializeComponent();
      
    }
    /// <summary>
    /// 加載后刷新
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void ProgressBarControl_OnLoaded(object sender, RoutedEventArgs e)
    {
      animationTimer = new DispatcherTimer(DispatcherPriority.ContextIdle, Dispatcher);
      //指定時間間隔
      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 屬性
    /// <summary>
    /// 獲取或設置圓圈數量
    /// 默認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>
    /// 獲取或設置圓圈大小
    /// 默認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>
    /// 獲取或設置面板大小
    /// 默認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>
    /// 獲取或設置每次旋轉角度
    /// 默認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>
    /// 獲取或設置每次旋轉間隔時間（毫秒）
    /// 默認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加載
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void HandleLoaded(object sender, RoutedEventArgs e)
    {
      //設置設置圓的位置和旋轉角度
      SetEclipsePosition(_dataModel);
      //DesignerProperties  提供用于與設計器進行通信的附加屬性。
      if (!DesignerProperties.GetIsInDesignMode(this))
      {
        if (this.Visibility == System.Windows.Visibility.Visible)
        {
          //超過計時器間隔時發生。
          animationTimer.Tick += HandleAnimationTick;
          animationTimer.Start();
        }
      }
    }

    /// <summary>
    /// 設置圓的位置和旋轉角度
    /// </summary>
    private void SetEclipsePosition(ProgressBarDataModel dataModel)
    {
      //圓周長就是：C = π * d 或者C=2*π*r（其中d是圓的直徑，r是圓的半徑）
      double r =dataModel.R;

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

      //根據圓中正弦、余弦計算距離
      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);
        //距離
        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卸載時
    /// </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>
    /// 超過計時器間隔時發生。
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void HandleAnimationTick(object sender, EventArgs e)
    {
      //設置旋轉角度
      SpinnerRotate.Angle = (SpinnerRotate.Angle + StepAngle) % 360;
    }
    #endregion
}

數據Model類：

/// <summary>
  /// 進度條Model類
  /// </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"/>

看完上述內容，你們掌握使用WPF怎么編寫一個轉圈進度條效果的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！