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Cara: Mengatur Durasi untuk Animasi

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mewakili Timeline segmen waktu dan panjang segmen tersebut ditentukan oleh garis Durationwaktu . Timeline Ketika mencapai akhir durasinya, ia berhenti bermain. Timeline Jika memiliki garis waktu anak, mereka juga berhenti bermain. Dalam kasus animasi, Duration menentukan berapa lama animasi mengambil transisi dari nilai awal ke nilai akhirnya.

Anda dapat menentukan Duration dengan waktu tertentu yang terbatas atau nilai Automatic khusus atau Forever. Durasi animasi harus selalu menjadi nilai waktu, karena animasi harus selalu memiliki panjang yang ditentukan dan terbatas—jika tidak, animasi tidak akan tahu cara transisi antara nilai targetnya. Garis waktu kontainer (TimelineGroup objek), seperti Storyboard dan ParallelTimeline, memiliki durasi Automaticdefault , yang berarti mereka secara otomatis berakhir ketika anak terakhir mereka berhenti bermain.

Dalam contoh berikut, lebar, tinggi, dan warna Rectangle isian animasi. Durasi diatur pada animasi dan garis waktu kontainer yang menghasilkan efek animasi termasuk mengontrol kecepatan animasi yang dirasakan dan mengesampingkan durasi garis waktu anak dengan durasi garis waktu kontainer.

Contoh

<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel Margin="20">
  
    <Rectangle Width="100" Height="100" Name="myRectangle">
      <Rectangle.Fill>
        <SolidColorBrush x:Name="MyAnimatedBrush" Color="Black" />
      </Rectangle.Fill>
      <Rectangle.Triggers>
      
        <!-- Animates the rectangle fill to yellow and width to 300. -->
        <EventTrigger RoutedEvent="Rectangle.Loaded">
          <BeginStoryboard>

            <!-- By default, TimelineGroup objects like Storyboard and ParallelTimeline have 
            a Duration of "Automatic". A TimelineGroup's automatic duration encompasses its 
            last-ending child. In this example, there is only one child of the Storyboard, the
            ParallelTimeline, so when the ParallelTimeline ends, the Storyboard duration will
            automatically end. -->
            <Storyboard>

              <!-- This ParallelTimeline has overriden its default duration of "Automatic" with
              a finite duration of half a second. This will force this Timeline to end after half a
              second even though its child Timelines have a longer duration (2 and 4 seconds respectively). 
              This cuts off the animation prematurely and the rectangle's fill will not go all the way to 
              yellow nor will the rectangle width get all the way to 300. Again, the default duration of a
              ParallelTimeline is "Automatic" so if you remove the finite duration, the ParallelTimeline
              will wait for its child timelines to end before it ends. -->

              <!-- Note: To specify a finite time in XAML, use the syntax of "days:hours:seconds". As mentioned,
              this ParallelTimeline has a duration of half a second. -->
              <ParallelTimeline Duration="0:0:0.5">

                <!-- For Animation Timelines like DoubleAnimation, the duration is one factor that
                determines the rate at which an animation appears to progress. For example, the DoubleAnimation
                below that animates the rectangle height will complete in only one second while the animation
                that animates the width willwill complete in 2 seconds which is relatively fast compared to the DoubleAnimation
                which animates the rectangle width over 4 seconds. -->
                <DoubleAnimation
                  Storyboard.TargetName="myRectangle"
                  Storyboard.TargetProperty="Height"
                  To="300" Duration="0:0:1" />

                <DoubleAnimation
                  Storyboard.TargetName="myRectangle"
                  Storyboard.TargetProperty="Width"
                  To="300" Duration="0:0:4" />

                <ColorAnimation
                  Storyboard.TargetName="MyAnimatedBrush"
                  Storyboard.TargetProperty="Color"
                  To="Yellow" Duration="0:0:2" />

              </ParallelTimeline>
            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
        
      </Rectangle.Triggers>
    </Rectangle>
  </StackPanel>
</Page>

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