【WPF】Image控件显示Gif图片

最新推荐文章于 2024-09-27 16:32:01 发布

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最新推荐文章于 2024-09-27 16:32:01 发布 · 155 阅读

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#wpf

class GifImage : Image
    {
        private bool _isInitialized;
        private GifBitmapDecoder _gifDecoder;
        private Int32Animation _animation;

        public int FrameIndex
        {
            get { return (int)GetValue(FrameIndexProperty); }
            set { SetValue(FrameIndexProperty, value); }
        }

        private void Initialize()
        {
            _gifDecoder = new GifBitmapDecoder(new Uri((this.GifSource.StartsWith("pack://") ? "" : "pack://application:,,,") + this.GifSource), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
            var frameinfo = _gifDecoder.Metadata.GetFrameInfo();
            var delay = frameinfo.Delay;
            _animation = new Int32Animation(0, _gifDecoder.Frames.Count - 1, new Duration(new TimeSpan(0, 0, 0, delay.Seconds * _gifDecoder.Frames.Count + (delay.Milliseconds * _gifDecoder.Frames.Count) / 1000, (delay.Milliseconds * _gifDecoder.Frames.Count) % 1000)));
            _animation.RepeatBehavior = RepeatBehavior.Forever;
            this.Source = _gifDecoder.Frames[0];

            _isInitialized = true;
        }

        static GifImage()
        {
            VisibilityProperty.OverrideMetadata(typeof(GifImage),
                new FrameworkPropertyMetadata(VisibilityPropertyChanged));
        }

        private static void VisibilityPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            if ((Visibility)e.NewValue == Visibility.Visib