主要功能有以下几点：
1、使用动画属性驱动图片运动动画
2、图片循环到最后一张后会自动循环
3、当鼠标放到图片时运动的图片会停止，当鼠标离开时暂停的图片会继续运动
4、当鼠标点击任何一个图片时，该图片会显示真正大小
XAML：
<Grid x:Name="Layout" Background="White">
<Canvas x:Name="canvas" Background="Black" Grid.Row="1" Height="280">
<!--隐藏矩形以外的其它部分-->
<Canvas.Clip >
<RectangleGeometry x:Name="rg" />
</Canvas.Clip>
<StackPanel x:Name="sp" Orientation="Horizontal" ></StackPanel>
</Canvas>
<Image x:Name="img_Full" Width="640" Height="480" Visibility="Collapsed" MouseLeftButtonUp="img_Full_MouseLeftButtonUp" />
</Grid>界面由Grid、Canvas、StackPanel和一个Image组成，Image用来显示图片的真实尺寸。
public partial class Demo : UserControl
{
//定义
private Storyboard storyboard;
private const double photowidth = 320;
private double totalwidth;
public Demo()
{
InitializeComponent();
CreatePhoto();
}
/// <summary>
/// 创建图片列表
/// </summary>
private void CreatePhoto()
{
string[] picList = new string[] { "1.jpg", "2.jpg", "3.jpg", "4.jpg", "5.jpg" };
//创建多组图片，保证图片不会出现空白,因为StackPanel是横向排列的，这样就可以把图片类似模拟的排成一圈
for (int i = 0; i < 3; i++)
{
//根据数组创建图片
for (int j = 0; j < picList.Length; j++)
{
UC_pic pic = new UC_pic();
pic.ImageUrl = "../images/photo/" + picList[j];
pic.Width = photowidth;
//绑定事件
pic.MouseEnter += new MouseEventHandler(pic_MouseEnter);
pic.MouseLeave += new MouseEventHandler(pic_MouseLeave);
pic.MouseLeftButtonUp += new MouseButtonEventHandler(pic_MouseLeftButtonUp);
//添加对象到StackPanel中
sp.Children.Add(pic);
}
}
//计算图片的总宽度
totalwidth = -1.0 * photowidth * picList.Length;
Canvas.SetLeft(sp, totalwidth);
//调用初始化 方法
CreateStoryboard();
//播放动画
storyboard.Begin();
//重新绘制区域
Resize();
}
/// <summary>
/// 创建故事面板
/// </summary>
private void CreateStoryboard()
{
//创建故事面板
storyboard = new Storyboard();
DoubleAnimation animation = new DoubleAnimation();
//设置动画延时
animation.Duration = new Duration(TimeSpan.FromSeconds(2.0));
//设置对象的作用属性
Storyboard.SetTarget(animation, sp);
Storyboard.SetTargetProperty(animation, new PropertyPath("(Canvas.Left)", new object[0]));
//添加到动画故事板内
storyboard.Children.Add(animation);
//动画自动完成事件
storyboard.Completed += new EventHandler(storyboard_Completed);
}
//动画自动完成事件，当动画播放完成（结束）的时候。再次循环动画
void storyboard_Completed(object sender, EventArgs e)
{
DoubleAnimation animation = (DoubleAnimation)storyboard.Children[0];
//取得图片当前位置
double left = Canvas.GetLeft(sp);
//如果图片已接近最后，就重新设置位置
if (left > (totalwidth - photowidth))
{
animation.From = new double?(left);
}
//设置动画的起始值（From）所依据的总量（总长度）
animation.By = new double?(totalwidth);
//循环动画
storyboard.Begin();
}
private void Resize()
{
//重新绘制显示区域
rg.Rect = new Rect(0, 0, this.ActualWidth, 260);
}
void pic_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
//显示放大图片
UC_pic pic = sender as UC_pic;
img_Full.Source = pic.photo.Source;
img_Full.Visibility = Visibility.Visible;
}
void pic_MouseLeave(object sender, MouseEventArgs e)
{
//继续动画
storyboard.Resume();
}
void pic_MouseEnter(object sender, MouseEventArgs e)
{
//暂停动画
storyboard.Pause();
}
private void img_Full_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
//隐藏放大图片
img_Full.Visibility = Visibility.Collapsed;
}
private void UserControl_SizeChanged(object sender, SizeChangedEventArgs e)
{
//动画根据屏幕大小改变而改变
Resize();
}
}同时还有一个UserControl用来承载图片代码如下：
<Canvas x:Name="LayoutRoot" Background="White">
<Image x:Name="photo" Width="320" Height="240" Stretch="UniformToFill" Margin="10" />
</Canvas>C#：
public partial class UC_pic : UserControl
{
public UC_pic()
{
InitializeComponent();
}
private string _imgUrl;
public string ImageUrl
{
get { return this._imgUrl; }
set {
//设置图片资源属性
this._imgUrl = value;
Uri uri = new Uri(value, UriKind.Relative);
BitmapImage bitimg = new BitmapImage(uri);
this.photo.Source = bitimg;
}
}
}这样就完成了跑马灯的效果，如图：
