[英]How to avoid the flickering effect when dynamically changes the image source in uwp
我已經設置了圖像,並且正在按鈕單擊事件中替換圖像源。 更換圖像源時出現閃爍效果。 如何解決呢?
<StackPanel>
<StackPanel Orientation="Horizontal">
<Image x:Name="image1" Height="200" Width="200" Source="ms-appx:///Assets/custom200.png"/>
<Image x:Name="image2" Height="200" Width="200" Source="ms-appx:///Assets/custom201.png"/>
<Image x:Name="image3" Height="200" Width="200" Source="ms-appx:///Assets/custom202.png"/>
<Image x:Name="image4" Height="200" Width="200" Source="ms-appx:///Assets/custom203.png"/>
</StackPanel>
<Button Height="50" Width="150" HorizontalAlignment="Center" VerticalAlignment="Center"
Content="Replace OSM" x:Name="replaceOSM" Click="replace_Click" Margin="5"/>
</StackPanel>
private void replace_Click(object sender, RoutedEventArgs e)
{
image1.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM200.png",
UriKind.RelativeOrAbsolute));
image2.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM201.png",
UriKind.RelativeOrAbsolute));
image3.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM202.png",
UriKind.RelativeOrAbsolute));
image4.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM203.png",
UriKind.RelativeOrAbsolute));
}
對於閃爍效果變化很快。 而且它確實在UI線程中花費了太長時間的代碼。
您可以使用bitmapImage.SetSourceAsync
等待圖像加載。
private async Task SetSourceAsync(Image image, Uri uri)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
var file = await StorageFile.GetFileFromApplicationUriAsync(uri);
var bitmapImage = new BitmapImage();
await bitmapImage.SetSourceAsync(await file.OpenAsync(FileAccessMode.Read));
image.Source = bitmapImage;
});
}
您可以更改代碼
image1.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM200.png",
UriKind.RelativeOrAbsolute));
image2.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM201.png",
UriKind.RelativeOrAbsolute));
image3.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM202.png",
UriKind.RelativeOrAbsolute));
image4.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM203.png",
UriKind.RelativeOrAbsolute));
image5.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM210.png",
UriKind.RelativeOrAbsolute));
image6.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM211.png",
UriKind.RelativeOrAbsolute));
image7.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM212.png",
UriKind.RelativeOrAbsolute));
image8.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM213.png",
UriKind.RelativeOrAbsolute));
image9.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM220.png",
UriKind.RelativeOrAbsolute));
image10.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM221.png",
UriKind.RelativeOrAbsolute));
image11.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM222.png",
UriKind.RelativeOrAbsolute));
image12.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM223.png",
UriKind.RelativeOrAbsolute));
至
private async void Replace_Click(object sender, RoutedEventArgs e)
{
await SetSourceAsync(image1, new Uri("ms-appx:///Assets/OSM200.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image2, new Uri("ms-appx:///Assets/OSM201.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image3, new Uri("ms-appx:///Assets/OSM202.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image4, new Uri("ms-appx:///Assets/OSM203.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image5, new Uri("ms-appx:///Assets/OSM210.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image6, new Uri("ms-appx:///Assets/OSM211.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image7, new Uri("ms-appx:///Assets/OSM212.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image8, new Uri("ms-appx:///Assets/OSM213.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image9, new Uri("ms-appx:///Assets/OSM220.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image10, new Uri("ms-appx:///Assets/OSM221.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image11, new Uri("ms-appx:///Assets/OSM222.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image12, new Uri("ms-appx:///Assets/OSM223.png",
UriKind.RelativeOrAbsolute));
}
但是,當代碼在某些較差的GPU中運行時,它始終會閃爍。
我認為另一種方法是“隱藏並顯示圖像”或制作動畫。
隱藏和顯示方式是制作一些將顯示其中一個面板的面板。
<StackPanel x:Name="custom">
<StackPanel Orientation="Horizontal">
<Image x:Name="image1" Height="200" Width="200" Source="ms-appx:///Assets/custom200.png"/>
<Image x:Name="image2" Height="200" Width="200" Source="ms-appx:///Assets/custom201.png"/>
<Image x:Name="image3" Height="200" Width="200" Source="ms-appx:///Assets/custom202.png"/>
<Image x:Name="image4" Height="200" Width="200" Source="ms-appx:///Assets/custom203.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image x:Name="image5" Height="200" Width="200" Source="ms-appx:///Assets/custom210.png"/>
<Image x:Name="image6" Height="200" Width="200" Source="ms-appx:///Assets/custom211.png"/>
<Image x:Name="image7" Height="200" Width="200" Source="ms-appx:///Assets/custom212.png"/>
<Image x:Name="image8" Height="200" Width="200" Source="ms-appx:///Assets/custom213.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image x:Name="image9" Height="200" Width="200" Source="ms-appx:///Assets/custom220.png"/>
<Image x:Name="image10" Height="200" Width="200" Source="ms-appx:///Assets/custom221.png"/>
<Image x:Name="image11" Height="200" Width="200" Source="ms-appx:///Assets/custom222.png"/>
<Image x:Name="image12" Height="200" Width="200" Source="ms-appx:///Assets/custom223.png"/>
</StackPanel>
</StackPanel>
<StackPanel x:Name="Osm" Visibility="Collapsed">
<StackPanel Orientation="Horizontal">
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM200.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM201.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM202.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM203.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM210.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM211.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM212.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM213.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM220.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM221.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM222.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM223.png"/>
</StackPanel>
</StackPanel>
您可以編寫一些按鈕,然后單擊
<StackPanel Orientation="Horizontal">
<Button Height="50" Width="150" HorizontalAlignment="Center" VerticalAlignment="Center"
Content="ReplaceCustom" Click="ShowCustom_OnClick" Margin="5"/>
<Button Height="50" Width="150" HorizontalAlignment="Center" VerticalAlignment="Center"
Content="Replace OSM" Click="ShowReplace_OnClick" Margin="5"/>
</StackPanel>
單擊按鈕時可以顯示面板。
private void ShowCustom_OnClick(object sender, RoutedEventArgs e)
{
custom.Visibility = Visibility.Visible;
Osm.Visibility = Visibility.Collapsed;
}
private void ShowReplace_OnClick(object sender, RoutedEventArgs e)
{
custom.Visibility = Visibility.Collapsed;
Osm.Visibility = Visibility.Visible;
}
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