让GIF在WPF中播放(使用GifImage类)

本文关键字：使用 GifImage 播放 GIF WPF | 更新日期: 2023-09-27 17:49:28

下面是我在这里找到的一段代码:我如何得到一个动画gif工作在WPF?

class GifImage : Image {
    public int FrameIndex {
        get { return (int)GetValue(FrameIndexProperty); }
        set { SetValue(FrameIndexProperty, value); }
    }
    public static readonly DependencyProperty FrameIndexProperty =
        DependencyProperty.Register("FrameIndex", typeof(int), typeof(GifImage), new UIPropertyMetadata(0, new PropertyChangedCallback(ChangingFrameIndex)));
    static void ChangingFrameIndex(DependencyObject obj, DependencyPropertyChangedEventArgs ev) {
        GifImage ob = obj as GifImage;
        ob.Source = ob.gf.Frames[(int)ev.NewValue];
        ob.InvalidateVisual();
    }
    GifBitmapDecoder gf;
    Int32Animation anim ;            
    public GifImage(Uri uri) {
        gf = new GifBitmapDecoder(uri, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
        anim = new Int32Animation(0, gf.Frames.Count - 1, new Duration(new TimeSpan(0,0, 0,gf.Frames.Count/10,(int)((gf.Frames.Count/10.0-gf.Frames.Count/10)*1000))));
        anim.RepeatBehavior = RepeatBehavior.Forever;
        Source = gf.Frames[0];
    }
    bool animationIsWorking = false;
    protected override void OnRender(DrawingContext dc) {
        base.OnRender(dc);
        if (!animationIsWorking) {
            BeginAnimation(FrameIndexProperty, anim);
            animationIsWorking = true;
        }
    }
}

它应该允许我使用GifImage作为一个控件。但

  1. 如何在XAML中使用它?
  2. 如何设置源?我尝试了各种组合，但不工作，没有文档:

GifImage = new GifImage(newUri("/应用程序;组件/图片/indicator.gif");

不起作用，异常告诉我错误的路径，但我就是找不到正确的路径。帮助. .

让GIF在WPF中播放(使用GifImage类)

我稍微修改了一下上面的代码，它似乎可以工作。

Xaml: 

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication1"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <local:GifImage GifSource="c:'data'test.gif" />
    </Grid>
</Window>

代码:

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

namespace WpfApplication1
{
    public class GifImage : Image
    {
        private GifBitmapDecoder _decoder;
        private Int32Animation _animation;
        #region FrameIndex
        public static readonly DependencyProperty FrameIndexProperty = DependencyProperty.Register("FrameIndex", typeof(int), typeof(GifImage), new UIPropertyMetadata(0, new PropertyChangedCallback(ChangingFrameIndex)));
        public int FrameIndex
        {
            get { return (int)GetValue(FrameIndexProperty); }
            set { SetValue(FrameIndexProperty, value); }
        }
        private static void ChangingFrameIndex(DependencyObject obj, DependencyPropertyChangedEventArgs ev)
        {
            GifImage gifImage = obj as GifImage;
            gifImage.ChangeFrameIndex((int)ev.NewValue);
        }
        private void ChangeFrameIndex(int index)
        {
            Source = _decoder.Frames[index];
        }
        #endregion
        #region GifSource
        public static readonly DependencyProperty GifSourceProperty = DependencyProperty.Register("GifSource", typeof(string), typeof(GifImage), new UIPropertyMetadata(String.Empty, new PropertyChangedCallback(GifSourceChanged)));
        public string GifSource
        {
            get { return (string)GetValue(GifSourceProperty); }
            set { SetValue(GifSourceProperty, value); }
        }
        private static void GifSourceChanged(DependencyObject obj, DependencyPropertyChangedEventArgs ev)
        {
            GifImage gifImage = obj as GifImage;
            gifImage.GifSourceChanged(ev.NewValue.ToString());
        }
        private void GifSourceChanged(string newSource)
        {
            if (_animation != null)
                BeginAnimation(FrameIndexProperty, null);
            _decoder = new GifBitmapDecoder(new Uri(newSource), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
            Source = _decoder.Frames[0];
            int count = _decoder.Frames.Count;
            _animation = new Int32Animation(0, count - 1, new Duration(new TimeSpan(0, 0, 0, count / 10, (int)((count / 10.0 - count / 10) * 1000))));
            _animation.RepeatBehavior = RepeatBehavior.Forever;
            BeginAnimation(FrameIndexProperty, _animation);
        }
        #endregion
    }
}
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