Comment : rechercher un storyboard de façon synchrone

L’exemple suivant montre comment utiliser la SeekAlignedToLastTick méthode d’un Storyboard pour rechercher une position dans une animation de table de montage séquentiel de manière synchrone.

Balisage XAML

Voici le balisage XAML de cet exemple.

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="SDKSample.SeekStoryboardSynchronouslyExample">
  <StackPanel Margin="20" >

    <Rectangle Name="myRectangle"
      Width="10" Height="20" Fill="#AA3333FF" HorizontalAlignment="Left" >
      <Rectangle.Triggers>
        <EventTrigger RoutedEvent="Rectangle.Loaded">
          <BeginStoryboard Name="myBeginStoryboard">
            <Storyboard Name="myStoryboard" Duration="0:0:4">
              <DoubleAnimation 
                Storyboard.TargetName="myRectangle" 
                Storyboard.TargetProperty="Width" 
                Duration="0:0:4" From="10" To="500"/>
            </Storyboard>

          </BeginStoryboard>
        </EventTrigger>
      </Rectangle.Triggers>
    </Rectangle>

    <!-- Use this slider to seek to different points of the Storyboard Duration 
         (in milliseconds). -->
    <Slider Name="SeekSlider" ValueChanged="OnSliderValueChanged" Height="Auto" 
    Width="500" Minimum="0" Maximum="4000" HorizontalAlignment="Left" />

    <!-- TextBlock displays the current time position of the Storyboard in milliseconds. -->
    <TextBlock Name="PositionTextBlock"/>
  </StackPanel>
</Page>

Code

Voici le code utilisé avec le code XAML ci-dessus.

using System;
using System.Media;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Animation;

namespace SDKSample
{

    public partial class SeekStoryboardSynchronouslyExample : Page
    {
        private void OnSliderValueChanged(object sender, RoutedEventArgs e)
        {
            int sliderValue = (int)SeekSlider.Value;

            // The SeekAlignedToLastTick method should be used to seek a Storyboard synchronously.
            myStoryboard.SeekAlignedToLastTick(myRectangle, new TimeSpan(0, 0, 0, 0, sliderValue), TimeSeekOrigin.BeginTime);
            PositionTextBlock.Text = sliderValue.ToString();
        }
    }
}

Imports System.Media
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media.Animation

Namespace SDKSample

    Partial Public Class SeekStoryboardSynchronouslyExample
        Inherits Page
        Private Sub OnSliderValueChanged(ByVal sender As Object, ByVal e As RoutedEventArgs)
            Dim sliderValue As Integer = CInt(SeekSlider.Value)

            ' The SeekAlignedToLastTick method should be used to seek a Storyboard synchronously.
            myStoryboard.SeekAlignedToLastTick(myRectangle, New TimeSpan(0, 0, 0, 0, sliderValue), TimeSeekOrigin.BeginTime)
            PositionTextBlock.Text = sliderValue.ToString()
        End Sub
    End Class

End Namespace