控制Storyboard播放zz

 1 <Grid Width="300" Height="460">
 2         <Grid.RowDefinitions>
 3             <RowDefinition Height="*"/>        
 4             <RowDefinition Height="60"/>
 5             <RowDefinition Height="100"/>
 6         </Grid.RowDefinitions>
 7         <Grid.Triggers>
 8             <EventTrigger SourceName="btnStart" RoutedEvent="Button.Click">
 9                 <BeginStoryboard x:Name="myImageBStoryboard"  >
10                     <Storyboard CurrentTimeInvalidated="Storyboard_CurrentTimeInvalidated">
11                         <DoubleAnimation Storyboard.TargetName="myImageB" Storyboard.TargetProperty="Opacity" From="1" To="0" Duration="00:00:05">
12                             
13                         </DoubleAnimation>
14                     </Storyboard>
15                 </BeginStoryboard>
16             </EventTrigger>
17             <EventTrigger SourceName="btnPause" RoutedEvent="Button.Click">
18                 <PauseStoryboard BeginStoryboardName="myImageBStoryboard"></PauseStoryboard>
19             </EventTrigger>
20             <EventTrigger SourceName="btnResume" RoutedEvent="Button.Click">
21                 <ResumeStoryboard BeginStoryboardName="myImageBStoryboard"></ResumeStoryboard>
22             </EventTrigger>
23             <EventTrigger SourceName="btnStop" RoutedEvent="Button.Click">
24                 <StopStoryboard BeginStoryboardName="myImageBStoryboard"></StopStoryboard>
25             </EventTrigger>
26             <EventTrigger SourceName="btnMiddle" RoutedEvent="Button.Click">
27                 <SeekStoryboard BeginStoryboardName="myImageBStoryboard" Offset="00:00:02">                    
28                 </SeekStoryboard>
29             </EventTrigger>
30         </Grid.Triggers>
31         <Grid Grid.Row="0" Grid.Column="0"  >
32             <Image x:Name="myImageA" Source="Images/A.jpg"  Height="300" Width="300" Stretch="Fill"></Image>
33             <Image x:Name="myImageB" Source="Images/B.jpg"   Height="300" Width="300"  Stretch="Fill" ></Image>
34         </Grid>
35         <StackPanel Grid.Row="1" Grid.Column="0" Orientation="Horizontal">            
36             <Button x:Name="btnStart" Content="Start" Width="50" Height="40"  Margin="3" ></Button>
37             <Button x:Name="btnPause" Content="Pause" Width="50" Height="40" Margin="3" ></Button>
38             <Button x:Name="btnResume" Content="Resume" Width="50" Height="40" Margin="3" ></Button>
39             <Button x:Name="btnStop" Content="Stop" Width="50" Height="40" Margin="3" ></Button>
40             <Button x:Name="btnMiddle" Content="SeekToMiddle" Width="50" Height="40" Margin="3" ></Button>
41         </StackPanel>
42         <StackPanel Grid.Row="2" Grid.Column="0" Orientation="Vertical">
43             <TextBlock x:Name="myTextBlock" FontSize="13" Foreground="Red"> </TextBlock>
44             <ProgressBar x:Name="myProgressBar"  Height="35" Background="White" Width="300" >
45                 <ProgressBar.Foreground>
46                     <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
47                         <GradientStop Color="#FF4DF22F" Offset="0.505" />
48                         <GradientStop Color="#FFEFF5F1" Offset="1" />
49                         <GradientStop Color="#FFF8F8F8" Offset="0.013" />
50                     </LinearGradientBrush>
51                 </ProgressBar.Foreground>
52             </ProgressBar>
53         </StackPanel>
54     </Grid>

 1 public partial class MainWindow : Window
 2     {
 3         public MainWindow()
 4         {
 5             InitializeComponent();
 6         }
 7 
 8         private void Storyboard_CurrentTimeInvalidated(object sender, EventArgs e)
 9         {
10             Clock storyboardClock = sender as Clock;
11             if (storyboardClock.CurrentProgress != null)
12             {
13                 myTextBlock.Text = storyboardClock.CurrentTime.ToString();
14                 myProgressBar.Value = (double)storyboardClock.CurrentProgress*100;(注意这儿storyboardClock.CurrentProgres值范围是0至1)
15                 System.Diagnostics.Debug.WriteLine(myProgressBar.Value);
16             }
17             else
18             {
19                 myProgressBar.Value = 0;
20                 myTextBlock.Text = "Stopped";
21             }
22         }
23     }