Comment : contrôler un MediaElement à l'aide d'une table de montage séquentielle
Mise à jour : novembre 2007
Cet exemple indique comment contrôler un MediaElement à l'aide d'un MediaTimeline dans un Storyboard.
Exemple
Lorsque vous utilisez un MediaTimeline dans un Storyboard pour contrôler le minutage d'un MediaElement, les fonctionnalités sont identiques à celles d'autres objets Timeline, tels que les animations. Par exemple, un MediaTimeline utilise des propriétés Timeline telles que la propriété BeginTime pour spécifier le moment auquel démarrer un MediaElement (démarrer la lecture du média). Il utilise également la propriété Duration pour spécifier la durée pendant laquelle MediaElement est actif (durée de lecture du média). Pour plus d'informations sur l'utilisation des objets Timeline avec un Storyboard, consultez Vue d'ensemble des tables de montage séquentiel.
Cet exemple indique comment créer un lecteur multimédia simple qui utilise un MediaTimeline pour contrôler la lecture. Le lecteur multimédia inclut les boutons lire, pause, reprendre et arrêter. Le lecteur dispose également d'un contrôle Slider qui agit comme une barre de progression.
L'exemple suivant crée l'interface utilisateur (UI) du lecteur multimédia.
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
x:Class="SDKSample.MediaTimelineExample" >
<StackPanel Background="Black">
<MediaElement Name="myMediaElement" MediaOpened="Element_MediaOpened"
Width="260" Height="150" Stretch="Fill" />
<!-- Button controls for play, pause, resume, and stop. -->
<StackPanel HorizontalAlignment="Center" Width="260" Orientation="Horizontal">
<Image Name="PlayButton" Source="images\UI_play.gif" Margin="30,10,10,10" />
<Image Name="PauseButton" Source="images\UI_pause.gif" Margin="10" />
<Image Name="ResumeButton" Source="images\UI_resume.gif" Margin="10" />
<Image Name="StopButton" Source="images\UI_stop.gif" Margin="10" />
</StackPanel>
<!-- Ths slider shows the progress of the media. -->
<Slider Name="timelineSlider" Margin="5" Width="250" HorizontalAlignment="Center"/>
<StackPanel.Triggers>
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="PlayButton">
<EventTrigger.Actions>
<BeginStoryboard Name= "myBegin">
<Storyboard SlipBehavior="Slip">
<!-- The MediaTimeline controls the timing of the video and acts like other Timeline objects.
For example, although the video clip (numbers.wmv) lasts longer, playback ends after six
seconds because that is the duration of the MediaTimeline (Duration="0:0:6"). -->
<MediaTimeline Source="media\numbers.wmv" Storyboard.TargetName="myMediaElement"
BeginTime="0:0:0" Duration="0:0:6" CurrentTimeInvalidated="MediaTimeChanged" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
<!-- These triggers impliment the functionality of the Pause, Resume
and Stop buttons.-->
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="PauseButton">
<EventTrigger.Actions>
<PauseStoryboard BeginStoryboardName="myBegin" />
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="ResumeButton">
<EventTrigger.Actions>
<ResumeStoryboard BeginStoryboardName="myBegin" />
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="StopButton">
<EventTrigger.Actions>
<StopStoryboard BeginStoryboardName="myBegin" />
</EventTrigger.Actions>
</EventTrigger>
</StackPanel.Triggers>
</StackPanel>
</Page>
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
x:Class="SDKSample.MediaTimelineExample" >
<StackPanel Background="Black">
<MediaElement Name="myMediaElement" MediaOpened="Element_MediaOpened"
Width="260" Height="150" Stretch="Fill" />
<!-- Button controls for play, pause, resume, and stop. -->
<StackPanel HorizontalAlignment="Center" Width="260" Orientation="Horizontal">
<Image Name="PlayButton" Source="images\UI_play.gif" Margin="30,10,10,10" />
<Image Name="PauseButton" Source="images\UI_pause.gif" Margin="10" />
<Image Name="ResumeButton" Source="images\UI_resume.gif" Margin="10" />
<Image Name="StopButton" Source="images\UI_stop.gif" Margin="10" />
</StackPanel>
<!-- Ths slider shows the progress of the media. -->
<Slider Name="timelineSlider" Margin="5" Width="250" HorizontalAlignment="Center"/>
<StackPanel.Triggers>
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="PlayButton">
<EventTrigger.Actions>
<BeginStoryboard Name= "myBegin">
<Storyboard SlipBehavior="Slip">
<!-- The MediaTimeline controls the timing of the video and acts like other Timeline objects.
For example, although the video clip (numbers.wmv) lasts longer, playback ends after six
seconds because that is the duration of the MediaTimeline (Duration="0:0:6"). -->
<MediaTimeline Source="media\numbers.wmv" Storyboard.TargetName="myMediaElement"
BeginTime="0:0:0" Duration="0:0:6" CurrentTimeInvalidated="MediaTimeChanged" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
<!-- These triggers impliment the functionality of the Pause, Resume
and Stop buttons.-->
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="PauseButton">
<EventTrigger.Actions>
<PauseStoryboard BeginStoryboardName="myBegin" />
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="ResumeButton">
<EventTrigger.Actions>
<ResumeStoryboard BeginStoryboardName="myBegin" />
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="Image.MouseDown" SourceName="StopButton">
<EventTrigger.Actions>
<StopStoryboard BeginStoryboardName="myBegin" />
</EventTrigger.Actions>
</EventTrigger>
</StackPanel.Triggers>
</StackPanel>
</Page>
L'exemple suivant crée les fonctionnalités de la barre de progression.
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Namespace SDKSample
Partial Class MediaTimelineExample
Inherits Page
' When the media opens, initialize the "Seek To" slider maximum value
' to the total number of miliseconds in the length of the media clip.
Private Sub Element_MediaOpened(ByVal sender As Object, ByVal e As RoutedEventArgs)
timelineSlider.Maximum = myMediaElement.NaturalDuration.TimeSpan.TotalMilliseconds
End Sub 'Element_MediaOpened
Private Sub MediaTimeChanged(ByVal sender As Object, ByVal e As EventArgs)
timelineSlider.Value = myMediaElement.Position.TotalMilliseconds
End Sub 'MediaTimeChanged
End Class 'MediaTimelineExample
End Namespace 'SDKSample
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
namespace SDKSample
{
public partial class MediaTimelineExample : Page
{
// When the media opens, initialize the "Seek To" slider maximum value
// to the total number of miliseconds in the length of the media clip.
private void Element_MediaOpened(object sender, EventArgs e)
{
timelineSlider.Maximum = myMediaElement.NaturalDuration.TimeSpan.TotalMilliseconds;
}
private void MediaTimeChanged(object sender, EventArgs e)
{
timelineSlider.Value = myMediaElement.Position.TotalMilliseconds;
}
}
}
Pour l'exemple complet, consultez Galerie multimédia.
Voir aussi
Tâches
Comment : contrôler un MediaElement (lecture, pause, arrêt, volume et vitesse)
Concepts
Vue d'ensemble des tables de montage séquentiel
Vue d'ensemble des animations d'image clé
Vue d'ensemble des graphiques, animations et du multimédia WPF