我想分别在暂停/播放模式下在视频上显示播放/暂停图标 . 几秒钟后,这些图标就会消失 . 将fadeout / fadein动画应用到它的最佳方法是什么?
<MediaElement Name="videoMediaElement" AreTransportControlsEnabled="True" Stretch="Fill" PointerPressed="videoMediaElement_PointerPressed" MediaOpened="videoMediaElement_MediaOpened" CurrentStateChanged="Media_State_Changed" >
<MediaElement.TransportControls>
<MediaTransportControls Background="Red" Foreground="White" IsStopButtonVisible="True" IsStopEnabled="True" IsTextScaleFactorEnabled="True" IsPlaybackRateEnabled="True" IsPlaybackRateButtonVisible="True" IsFastForwardButtonVisible="True" IsFastForwardEnabled="True" IsFastRewindButtonVisible="True" IsFastRewindEnabled="True" />
</MediaElement.TransportControls>
</MediaElement>
<Image x:Name="icon_play" Source="Assets/icon_play.png" Visibility="Collapsed" Opacity="0.5" HorizontalAlignment="Center" Height="100px" Width="100"/>
<Image x:Name="icon_pause" Source="Assets/icon_pause.png" Visibility="Collapsed" Opacity="0.5" HorizontalAlignment="Center" Height="100px" Width="100"/>
private void Media_State_Changed(object sender, RoutedEventArgs args)
{
if (videoMediaElement.CurrentState == MediaElementState.Paused)
{
icon_play.Visibility = Visibility.Visible;
icon_pause.Visibility = Visibility.Collapsed;
}
else if (videoMediaElement.CurrentState == MediaElementState.Playing)
{
icon_pause.Visibility = Visibility.Visible;
icon_play.Visibility = Visibility.Collapsed;
}
}
2 回答
通过设置
AreTransportControlsEnabled="True"
,您决定使用内置媒体播放器 . 您可以进行一些自定义(如颜色),但这些非常有限 . 如果您想构建自己的UI,则需要设置AreTransportControlsEnabled="False"
并使用XAML创建自己的UI .创建XAML动画,如:
然后调用
FadeOut.Begin();
或创建(我更喜欢)合成动画:
现在,每次更改visual 's opacity - it' ll的值时都会被动画化:
playVisual.Opacity = 0;