C# WPF 低仿网易云音乐（PC）Banner动画控件

由于技术有限没能做到一模一样的动画，只是粗略地做了一下。动画有点生硬，还有就是没做出网易云音乐的立体感。代码非常简单粗暴，而且我也写有很多注释，这里就不多啰嗦了，直接贴代码。

算了，啰嗦几句。原理是这样的，在自定义用户控件内添加3个border（左、中、右，以下分别简称为：b1、b2、b3），对border进行缩放和移动动画。往右切换时b1放大平移到b2的位置，b2缩小平移到b3的位置，b3平移到b1的位置，动画结束后重新记录3个border的左、中、右位置，然后如此循环。一次滚动有三个动画，分别写了3个方法来定义。

可加上透明动画、阴影，应该会更加好看些。

没有实现调用的方法，只是个纯动画项目，图片也是写死在前台代码中，需要在项目中使用时自行简单地修改即可。

低仿效果

网易云音乐原版

代码

后台

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Windows.Threading;

namespace 网易云音乐Banner动画.Controls

{

    /// <summary>

    /// CloudMusicBanner.xaml 的交互逻辑

    /// </summary>

    public partial class CloudMusicBanner : UserControl

    {

        //代码所用涉及时间单位均是：秒

        #region 一些变量

        //左、中、右三张banner的位置

        double leftlocation = , centerlocation = , rightlocation = ;

        //每张banner的动画执行时间

        double AnimationTime = 0.4;

        //非中间banner的遮盖层透明度

        double bopacity = 0.65;

        //没有交互时动画自动执行间隔时间

        double timeranimation_time = ;

        //动画播放状态（当前动画是否在执行）

        bool isplay = false;

        //三个banner border变量，用于暂时保存

        Border b_left, b_center, b_right;

        //通用缓动函数，提升动画流畅感

        EasingFunctionBase easeFunction;

        //banner集合，用于定位和记录border的位置（左，中，右）

        Dictionary<Location, Border> Banners = new Dictionary<Location, Border>();

        DispatcherTimer timeranimation;

        #endregion

        public CloudMusicBanner()

        {

            InitializeComponent();

            //将三张banner(border)添加到banner集合

            Banners.Add(Location.Left, left);

            Banners.Add(Location.Center, center);

            Banners.Add(Location.Right, right);

            //控件加载完成后

            Loaded += (e, c) =>

            {

                //首次启动设置三张banner的位置、大小信息

                SetLocation(Location.Left, left);

                SetLocation(Location.Center, center);

                SetLocation(Location.Right, right);

                //启动定时器，用于自动播放滚动动画

                TimerAnimationStart();

            };

            //初始化缓动函数

            //quadraticease的easeout mode是从快到慢

            //参考了博客：http://www.cnblogs.com/xwlyun/archive/2012/09/11/2680579.html

            easeFunction = new QuadraticEase()

            {

                EasingMode = EasingMode.EaseOut

            };

            //初始化定时器

            timeranimation = new DispatcherTimer();

            //设置定时器的间隔时间

            timeranimation.Interval = TimeSpan.FromSeconds(timeranimation_time);

        }

        #region 交互事件

        private void UserControl_MouseEnter(object sender, MouseEventArgs e)

        {

            //鼠标移入控件时显示两个“左/右”图标按钮

            toleftbtn.Opacity = ;

        }

        private void UserControl_MouseLeave(object sender, MouseEventArgs e)

        {

            //鼠标移出控件时隐藏两个“左/右”图标按钮

            toleftbtn.Opacity = ;

        }

        private void toleftbtn_Click(object sender, RoutedEventArgs e)

        {

            //向左图标按钮点击

            LeftAnimation();

        }

        private void torightbtn_Click(object sender, RoutedEventArgs e)

        {

            RightAnimation();

        }

        #endregion

        //左切换动画时三张banner向右滚动

        /*

         * 即中间的border移动至：右

         * 右边的border移动至：左

         * 左边的border移动至：中

         */

        #region 左切换动画

        public void LeftAnimation()

        {

            //启动动画时停止定时器

            timeranimation.Stop();

            //设置动画播放状态为真

            isplay = true;

            //启动相应的动画

            LefttoCenterAnimation();

            CentertoRightAnimation();

            RighttoLeftAnimation();

        }

        //【仅注释此方法，以下代码均大多重复故不再注释】

        #region 左切换动画-中向右动画

        public void CentertoRightAnimation()

        {

            //记录动画结束后的位置，即当动画结束后中间的BORDER移动到右变成了右，代码：Banners[Location.Right] = b_center;

            b_center = Banners[Location.Center];

            //设置一下border的显示层级

            Grid.SetZIndex(Banners[Location.Center], );

            //获取透明遮盖图层，设置透明度

            /*

             * <Grid Background="Black" Panel.ZIndex="2"></Grid>

             * 透明遮盖图层在设计代码中的每个border内

             *

             */

            GetOpacityGrid(b_center).Opacity = bopacity;

            //定义一个缩放转换对象（用于banner从大到小的动画）

            ScaleTransform scale = new ScaleTransform();

            //需要设置中心点y坐标为控件的高度，不设置的话border是靠在顶部执行动画的。

            scale.CenterY = this.ActualHeight;

            //定义一个水平移动转换对象

            TranslateTransform ts = new TranslateTransform();

            //定义一个转换集合

            TransformGroup group = new TransformGroup();

            //将上面的缩放、平移转换对象添加到集合

            group.Children.Add(scale);

            group.Children.Add(ts);

            //将转换集合赋予给中心banner

            Banners[Location.Center].RenderTransform = group;

            //定义一个缩放动画

            DoubleAnimation scaleAnimation = new DoubleAnimation()

            {

                //从1（100%即默认比例）

                From = ,

                //到0.95（95%即从默认比例缩小到95%的比例大小）

                To = 0.95,

                //设置缓动函数

                EasingFunction = easeFunction,

                //动画执行所需时间

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            //定义一个移动动画（用于banner从左到右.....移动动画等）

            DoubleAnimation moveAnimation = new DoubleAnimation()

            {

                //从中心banner位置

                From = centerlocation,

                //移动到右banner位置

                To = rightlocation,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            //启动缩放动画

            scale.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);

            scale.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);

            //启动平移动画

            ts.BeginAnimation(TranslateTransform.XProperty, moveAnimation);

        }

        #endregion

        #region 左切换动画-右向左动画

        public void RighttoLeftAnimation()

        {

            b_right = Banners[Location.Right];

            Grid.SetZIndex(Banners[Location.Right], );

            GetOpacityGrid(b_right).Opacity = bopacity;

            ScaleTransform scale = new ScaleTransform();   //缩放

            scale.CenterY = this.ActualHeight;

            TranslateTransform ts = new TranslateTransform();//平移

            TransformGroup group = new TransformGroup();

            group.Children.Add(scale);

            group.Children.Add(ts);

            Banners[Location.Right].RenderTransform = group;

            DoubleAnimation scaleAnimation = new DoubleAnimation()

            {

                From = 0.85,

                To = 0.95,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            DoubleAnimation moveAnimation = new DoubleAnimation()

            {

                From = rightlocation,

                To = leftlocation,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            //scaleAnimation.Completed += new EventHandler(scaleAnimation_Completed);

            //  AnimationClock clock = scaleAnimation.CreateClock();

            scale.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);

            scale.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);

            //启动平移动画

            ts.BeginAnimation(TranslateTransform.XProperty, moveAnimation);

        }

        #endregion

        #region 左切换动画-左向中动画

        public void LefttoCenterAnimation()

        {

            b_left = Banners[Location.Left];

            Grid.SetZIndex(Banners[Location.Left], );

            GetOpacityGrid(b_left).Opacity = ;

            ScaleTransform scale = new ScaleTransform();   //缩放  

            //scale.CenterX = 0;

            scale.CenterY = this.ActualHeight;

            TranslateTransform ts = new TranslateTransform();//平移

            TransformGroup group = new TransformGroup();

            group.Children.Add(scale);

            group.Children.Add(ts);

            Banners[Location.Left].RenderTransform = group;

            DoubleAnimation scaleAnimation = new DoubleAnimation()

            {

                From = 0.95,

                To = ,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            DoubleAnimation moveAnimation = new DoubleAnimation()

            {

                From = leftlocation,

                To = centerlocation,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            scaleAnimation.Completed += new EventHandler(LeftAnimation_Completed);

            //  AnimationClock clock = scaleAnimation.CreateClock();

            scale.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);

            scale.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);

            //启动平移动画

            ts.BeginAnimation(TranslateTransform.XProperty, moveAnimation);

        }

        #endregion

        #region 动画结束

        private void LeftAnimation_Completed(object sender, EventArgs e)

        {

            //动画结束后将banner集合的位置重新设置

            Banners[Location.Left] = b_right;

            Banners[Location.Center] = b_left;

            Banners[Location.Right] = b_center;

            //此时动画结束

            isplay = false;

            //启动定时器

            TimerAnimationStart();

        }

        #endregion

        #endregion

        #region 右切换动画

        public void RightAnimation()

        {

            timeranimation.Stop();

            isplay = true;

            LefttoRightAnimation();

            CentertoLeftAnimation();

            RighttoCenterAnimation();

        }

        #region 右切换动画-左向右动画

        public void LefttoRightAnimation()

        {

            b_left = Banners[Location.Left];

            Grid.SetZIndex(Banners[Location.Left], );

            GetOpacityGrid(b_left).Opacity = bopacity;

            ScaleTransform scale = new ScaleTransform();   //缩放

            scale.CenterY = this.ActualHeight;

            TranslateTransform ts = new TranslateTransform();//平移

            TransformGroup group = new TransformGroup();

            group.Children.Add(scale);

            group.Children.Add(ts);

            Banners[Location.Left].RenderTransform = group;

            DoubleAnimation scaleAnimation = new DoubleAnimation()

            {

                From = 0.85,

                To = 0.95,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            DoubleAnimation moveAnimation = new DoubleAnimation()

            {

                From = leftlocation,

                To = rightlocation,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            scale.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);

            scale.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);

            //启动平移动画

            ts.BeginAnimation(TranslateTransform.XProperty, moveAnimation);

        }

        #endregion

        #region 右切换动画-中向左动画

        public void CentertoLeftAnimation()

        {

            b_center = Banners[Location.Center];

            Grid.SetZIndex(Banners[Location.Center], );

            GetOpacityGrid(b_center).Opacity = bopacity;

            ScaleTransform scale = new ScaleTransform();   //缩放

            scale.CenterY = this.ActualHeight;

            TranslateTransform ts = new TranslateTransform();//平移

            TransformGroup group = new TransformGroup();

            group.Children.Add(scale);

            group.Children.Add(ts);

            Banners[Location.Center].RenderTransform = group;

            DoubleAnimation scaleAnimation = new DoubleAnimation()

            {

                From = ,

                To = 0.95,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            DoubleAnimation moveAnimation = new DoubleAnimation()

            {

                From = centerlocation,

                To = leftlocation,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            //scaleAnimation.Completed += new EventHandler(scaleAnimation_Completed);

            //  AnimationClock clock = scaleAnimation.CreateClock();

            scale.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);

            scale.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);

            //启动平移动画

            ts.BeginAnimation(TranslateTransform.XProperty, moveAnimation);

        }

        #endregion

        #region 右切换动画-右向中动画

        public void RighttoCenterAnimation()

        {

            b_right = Banners[Location.Right];

            //SetZindex(b_right);

            Grid.SetZIndex(Banners[Location.Right], );

            GetOpacityGrid(b_right).Opacity = ;

            ScaleTransform scale = new ScaleTransform();   //缩放  

            //scale.CenterX = 0;

            scale.CenterY = this.ActualHeight;

            TranslateTransform ts = new TranslateTransform();//平移

            TransformGroup group = new TransformGroup();

            group.Children.Add(scale);

            group.Children.Add(ts);

            Banners[Location.Right].RenderTransform = group;

            DoubleAnimation scaleAnimation = new DoubleAnimation()

            {

                To = ,

                From = 0.95,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            DoubleAnimation moveAnimation = new DoubleAnimation()

            {

                From = rightlocation,

                To = centerlocation,

                EasingFunction = easeFunction,

                Duration = TimeSpan.FromSeconds(AnimationTime)

            };

            scaleAnimation.Completed += new EventHandler(RightAnimation_Completed);

            //  AnimationClock clock = scaleAnimation.CreateClock();

            scale.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);

            scale.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);

            //启动平移动画

            ts.BeginAnimation(TranslateTransform.XProperty, moveAnimation);

        }

        #endregion

        #region 动画结束

        private void RightAnimation_Completed(object sender, EventArgs e)

        {

            Banners[Location.Left] = b_center;

            Banners[Location.Center] = b_right;

            Banners[Location.Right] = b_left;

            isplay = false;

            TimerAnimationStart();

        }

        #endregion

        #endregion

        #region 初始化设置控件位置

        //定义一个枚举类用于标识左中右三个banner(border)，方便操作时获取到。

        public enum Location

        {

            Left, Center, Right

        }

        //设置三个border的大小和位置

        public void SetLocation(Location l, Border g)

        {

            //banner的大小

            g.Width = ;

            g.Height = ;

            //给除中间banner外的border缩小一些

            ScaleTransform scaleTransform = new ScaleTransform();

            scaleTransform.ScaleX = 0.95;

            scaleTransform.ScaleY = 0.95;

            scaleTransform.CenterY = this.ActualHeight;

            //获取设置遮盖层的透明度

            Grid opacity_grid = GetOpacityGrid(g);

            opacity_grid.Opacity = bopacity;

            switch (l)

            {

                case Location.Left:

                    TranslateTransform tt_left = new TranslateTransform()

                    {

                        X =

                    };

                    TransformGroup group_left = new TransformGroup();

                    group_left.Children.Add(tt_left);

                    group_left.Children.Add(scaleTransform);

                    g.RenderTransform = group_left;

                    break;

                case Location.Center:

                    opacity_grid.Opacity = ;

                    TransformGroup group_center = new TransformGroup();

                    //计算中心banner的x位置

                    centerlocation = (this.ActualWidth - g.ActualWidth) / ;

                    TranslateTransform tt_center = new TranslateTransform()

                    {

                        X = centerlocation

                    };

                    group_center.Children.Add(tt_center);

                    g.RenderTransform = group_center;

                    Grid.SetZIndex(g, );

                    break;

                case Location.Right:

                    //Grid.SetZIndex(g, 3);

                    //计算右banner的X位置

                    rightlocation = (this.ActualWidth - Banners[Location.Left].ActualWidth * 0.95);

                    TranslateTransform tt_right = new TranslateTransform()

                    {

                        X = rightlocation

                    };

                    TransformGroup group_right = new TransformGroup();

                    //这里要注意先后顺序，否则位置会有偏差，必须先缩放再设置X坐标。

                    group_right.Children.Add(scaleTransform);

                    group_right.Children.Add(tt_right);

                    g.RenderTransform = group_right;

                    break;

            }

        }

        #endregion

        //获取透明覆盖层

        //代码来自：https://www.cnblogs.com/udoless/p/3381411.html

        #region 获取透明覆盖层

        public Grid GetOpacityGrid(DependencyObject g)

        {

            Grid opacity_grid = GetChild<Grid>(g, typeof(Grid));

            opacity_grid = GetChild<Grid>(opacity_grid, typeof(Grid));

            return opacity_grid;

        }

        public T GetChild<T>(DependencyObject obj, Type typename) where T : FrameworkElement

        {

            DependencyObject child = null;

            List<T> childList = new List<T>();

            for (int i = ; i <= VisualTreeHelper.GetChildrenCount(obj) - ; i++)

            {

                child = VisualTreeHelper.GetChild(obj, i);

                if (child is T && (((T)child).GetType() == typename))

                {

                    return ((T)child);

                }

            }

            return null;

        }

        #endregion

        #region 定时唤醒动画

        public void TimerAnimationStart()

        {

            if (timeranimation.IsEnabled == false)

            {

                timeranimation.Start();

            }

            timeranimation.Tick += (e, c) =>

            {

                timeranimation.Stop();

                if (isplay == false)

                {

                    RightAnimation();

                }

            };

        }

        #endregion

    }

}

前台

<UserControl x:Class="网易云音乐Banner动画.Controls.CloudMusicBanner"

             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="762" MouseEnter="UserControl_MouseEnter" MouseLeave="UserControl_MouseLeave"

             >

    <Grid>

        <!--两个图标按钮，鼠标进入时显示-->

        <Button Name="toleftbtn" Opacity="0" Click="toleftbtn_Click" BorderThickness="0" HorizontalAlignment="Left" Background="Transparent" Panel.ZIndex="99" Width="50" Height="50" Cursor="Hand">

            <Image Source="/网易云音乐Banner动画;component/Res/左.png" Width="16" Height="16"></Image>

        </Button>

        <Button Name="torightbtn" Opacity="{Binding ElementName=toleftbtn,Path=Opacity}" Click="torightbtn_Click" BorderThickness="0" HorizontalAlignment="Right" Background="Transparent" Panel.ZIndex="99" Width="50" Height="50" Cursor="Hand">

            <Image Source="/网易云音乐Banner动画;component/Res/右.png" Width="16" Height="16"></Image>

        </Button>

        <Grid  HorizontalAlignment="Left">

           <!--左边的banner-->

            <Border BorderBrush="#000000" BorderThickness="0" Width="540" Name="left" Background="Black">

                <Grid>

                    <!--透明遮盖层-->

                    <Grid Background="Black" Panel.ZIndex="2"></Grid>

                    <!--banner图片-->

                    <Image Source="/网易云音乐Banner动画;component/Res/banner1.jpg" Stretch="Fill"></Image>

                </Grid>

            </Border>

            <!--中间的banner-->

            <Border BorderBrush="#96b0b3" BorderThickness="0" Width="540" Name="center" Background="Yellow" >

                <Grid>

                    <Grid Background="Black" Panel.ZIndex="2"></Grid>

                    <Image Source="/网易云音乐Banner动画;component/Res/banner2.jpg" Stretch="Fill"></Image>

                </Grid>

            </Border>

            <!--右边的banner-->

            <Border BorderBrush="#ab1491" BorderThickness="1" Name="right" Background="Red">

                <Grid>

                    <Grid Background="Black" Panel.ZIndex="2"></Grid>

                    <Image Source="/网易云音乐Banner动画;component/Res/banner3.jpg" Stretch="Fill"></Image>

                </Grid>

            </Border>

        </Grid>

    </Grid>

</UserControl>

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