WPF使用Animation仿WeChat（微信）播放語音消息

效果圖預覽

新建MyCustomControl類。

 public class MyCustomControl : Control
    {
        private static Storyboard MyStory;
        private ObjectAnimationUsingKeyFrames MyAnimation;
        private List<BitmapImage> ImageList;

        private UIElement animation;

        public static readonly DependencyProperty DurationProperty =
             DependencyProperty.Register("Duration", typeof(TimeSpan),
             typeof(MyCustomControl), new PropertyMetadata(null));

        /// <summary>
        /// 動畫時間
        /// </summary>
        public TimeSpan Duration
        {
            get { return (TimeSpan)GetValue(DurationProperty); }
            set { SetValue(DurationProperty, value); }
        }

        public static readonly DependencyProperty IsLitProperty =
             DependencyProperty.Register("IsLit", typeof(bool),
             typeof(MyCustomControl), new PropertyMetadata(false, new PropertyChangedCallback(OnIsLitChanged)));

        /// <summary>
        /// 是否開始播放
        /// </summary>
        public bool IsLit
        {
            get { return (bool)GetValue(IsLitProperty); }
            set { SetValue(IsLitProperty, value); }
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            animation = Template.FindName("animation", this) as UIElement;
            if (animation != null && IsLit)
                Animate(animation);

        }

        private static void OnIsLitChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            bool newValue = (bool)e.NewValue;
            if (newValue)
            {
                MyCustomControl c = d as MyCustomControl;
                if (c != null && c.animation != null)
                {
                    c.Animate(c.animation);
                }
            }
            else
            {
                MyStory.Stop();
            }
        }

        private void Animate(UIElement animation)
        {
            int count = 0;//計數
            for (double i = Duration.TotalSeconds; i > 1; i--)
            {
                if (count > 2)
                {
                    count = 0;
                }
                MyAnimation.KeyFrames.Add(
                   new DiscreteObjectKeyFrame()
                   {
                       Value = ImageList[count],
                       KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromSeconds(Duration.TotalSeconds - i))
                   });
                count++;
            }
            Storyboard.SetTarget(MyAnimation, animation);
            Storyboard.SetTargetProperty(MyAnimation,new PropertyPath(Image.SourceProperty));
            MyStory.Children.Add(MyAnimation);//將動畫添加到動畫板中

            Console.WriteLine($"一共添加：{MyAnimation.KeyFrames.Count} 個 DiscreteObjectKeyFrame。");
            MyStory.Begin();
        }
        public MyCustomControl()
        {
            MyStory = new Storyboard();
            MyAnimation = new ObjectAnimationUsingKeyFrames();
            MyAnimation.FillBehavior = FillBehavior.Stop;

            MyAnimation.Completed += (s, args) => 
            {
                IsLit = false;
            };

            ImageList = new List<BitmapImage>();
            ImageList.Add(new BitmapImage(new Uri("pack://application:,,,/Images/0.png")));
            ImageList.Add(new BitmapImage(new Uri("pack://application:,,,/Images/1.png")));
            ImageList.Add(new BitmapImage(new Uri("pack://application:,,,/Images/2.png")));
            

        }
    }

修改MainWindow.xaml。

<Window x:Class="WpfAnimationWeChat.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfAnimationWeChat"
        mc:Ignorable="d" WindowState="Maximized"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <ControlTemplate x:Key="ct" TargetType="local:MyCustomControl">
            <Image x:Name="animation" Height="20" Width="20" Source="/WpfAnimationWeChat;component/Images/2.png"/>
        </ControlTemplate>
    </Window.Resources>
    <Grid>
        <Viewbox>
            <Grid Width="1240" Height="768">
                <Grid Height="28" Width="100" MouseLeftButtonDown="Grid_MouseLeftButtonDown">
                    <Rectangle RadiusX="4" RadiusY="4" Fill="#9eea6a" />
                    <StackPanel Orientation="Horizontal" Margin="4,0">
                        <!--可以設置MyCustomControl的Duration 和 IsLit(點擊的時候執行)的{binding}-->
                        <local:MyCustomControl x:Name="AudioPlay" Template="{StaticResource ct}" Duration="0:00:10" IsLit="False"/>
                        <TextBlock Text="10ms”" VerticalAlignment="Center" FontSize="20"/>
                </StackPanel>
            </Grid>
            </Grid>
            
        </Viewbox>
    </Grid>
</Window>

新增資源（3張）。

MainWindow.xaml.cs新增Grid_MouseLeftButtonDown。

private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (this.AudioPlay.IsLit)
            {
                 this.AudioPlay.IsLit = false;
            }
            else
            {
                this.AudioPlay.IsLit = true;
            }
        }