豆瓣电台WP7客户端 开发记录7

  1  <Canvas>
2                     <Canvas.Resources>
 3                         <Storyboard x:Name="sb">
 4                             <DoubleAnimation x:Name="animation"
 5                             Storyboard.TargetProperty="(Canvas.Left)"
 6                             Storyboard.TargetName="SongName"
 7                             Duration="0:0:9"
 8                             RepeatBehavior="Forever" />
 9                         </Storyboard>
10                     </Canvas.Resources>
11                 <TextBlock  x:Name="SongName" FontSize="24"   HorizontalAlignment="Center" Margin="0,15,0,0" />
12  </Canvas> 

cs: 1  /// <summary>

2         /// 歌曲名称滚动
 3         /// </summary>
 4         private void SongNameMarquee()
 5         {
 6             this.sb.Stop();
 7             double sysWidth = System.Windows.Application.Current.Host.Content.ActualWidth;//屏幕宽度
 8             if (sysWidth <= this.SongName.ActualWidth)
 9             {
10                 animation.From = sysWidth;
11                 animation.To = -this.SongName.ActualWidth - (sysWidth - 360) / 2;//360为Canvas宽度
12                 this.sb.Begin();
13             }
14             else
15             {//canvas居中
16                 this.SongName.SetValue(Canvas.LeftProperty, 180-this.SongName.ActualWidth/2);
17             }
18 
19         }