由于歌曲名稱可能超過屏幕寬度而顯示不下，所以當歌曲名稱長度大于屏幕寬度的時候滾動顯示。

?這里主要用storyboard來完成，主要是silverlight的知識了。

?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?????????///?歌曲名稱滾動
?3?????????///?</summary>
?4?????????private?void?SongNameMarquee()
?5?????????{
?6?????????????this.sb.Stop();
?7?????????????double?sysWidth?=?System.Windows.Application.Current.Host.Content.ActualWidth;//屏幕寬度
?8?????????????if?(sysWidth?<=?this.SongName.ActualWidth)
?9?????????????{
10?????????????????animation.From?=?sysWidth;
11?????????????????animation.To?=?-this.SongName.ActualWidth?-?(sysWidth?-?360)?/?2;//360為Canvas寬度
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?????????}

?主要是計算幾個點麻煩點 其他沒什么。

轉載于:https://www.cnblogs.com/kklldog/archive/2011/09/15/2176806.html

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