305 lines
8.5 KiB
C#
305 lines
8.5 KiB
C#
/******************************************************************************
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* SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
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* CopyRight (C) 2012-2024 ShenYongHua(沈永华).
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* QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
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*
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* Blog: https://www.cnblogs.com/yhuse
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* Gitee: https://gitee.com/yhuse/SunnyUI
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* GitHub: https://github.com/yhuse/SunnyUI
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*
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* SunnyUI.dll can be used for free under the GPL-3.0 license.
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* If you use this code, please keep this note.
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* 如果您使用此代码，请保留此说明。
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******************************************************************************
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* 文件名称: UGif.cs
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* 文件说明: GIF图片帮助类，可控制单帧显示图片
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* 当前版本: V3.1
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* 创建日期: 2021-07-17
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*
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* 2021-07-17: V3.0.5 增加文件说明
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******************************************************************************/
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/* 用法
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private void button1_Click(object sender, System.EventArgs e)
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{
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Gif gif = new Gif("C:\\aa.gif");
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//gif.Loop = true;//是否循环播放
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gif.ImageChanged += Gif_ImageChanged;
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gif.Active = gif.IsGif;//打开播放
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}
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private void Gif_ImageChanged(object sender, System.Drawing.Image image)
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{
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pictureBox1.Image = image;
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}
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*/
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using System;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Windows.Forms;
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namespace Sunny.UI
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{
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/// <summary>
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/// GIF图片帮助类
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/// </summary>
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public class Gif : IDisposable
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{
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="fileName">文件名</param>
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public Gif(string fileName)
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{
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timer = new Timer();
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timer.Tick += Timer_Tick;
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if (File.Exists(fileName))
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{
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Image = Image.FromFile(fileName);
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}
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}
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="img">图片</param>
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public Gif(Image img)
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{
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timer = new Timer();
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timer.Tick += Timer_Tick;
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if (img != null)
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{
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Image = img;
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}
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}
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/// <summary>
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/// 析构函数
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/// </summary>
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public void Dispose()
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{
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Active = false;
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timer?.Stop();
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timer?.Dispose();
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Image?.Dispose();
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Image = null;
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ShowImage?.Dispose();
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ShowImage = null;
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}
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/// <summary>
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/// 是否循环
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/// </summary>
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public bool Loop
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{
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get; set;
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}
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/// <summary>
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/// 跳帧
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/// </summary>
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/// <param name="frameIndex">帧号</param>
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public void JumpToFrame(int frameIndex)
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{
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if (ImageCount == 0) return;
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if (frameIndex >= 0 && frameIndex < ImageCount)
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{
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if (ShowImage == null || ShowImage.Width != Image.Width || ShowImage.Height != Image.Height)
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{
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ShowImage?.Dispose();
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ShowImage = new Bitmap(Image.Width, Image.Height);
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}
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FrameDimension fd = Image.GifFrameDimension();
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Image.SelectActiveFrame(fd, frameIndex);
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using var g = ShowImage.Graphics();
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g.DrawImage(Image, 0, 0, Image.Width, Image.Height);
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ImageChanged?.Invoke(this, ShowImage);
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}
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}
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private Image ShowImage;
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private void Timer_Tick(object sender, EventArgs e)
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{
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timer.Stop();
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if (Image == null)
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{
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Active = false;
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return;
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}
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if (IsGif)
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{
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JumpToFrame(FrameIndex);
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if (FrameIndex < ImageCount - 1)
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{
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FrameIndex++;
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}
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else
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{
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if (Loop)
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{
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FrameIndex = 0;
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}
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else
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{
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active = false;
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}
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}
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}
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else
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{
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ImageChanged?.Invoke(this, Image);
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}
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timer.Enabled = IsGif && active;
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}
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/// <summary>
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/// 图片切换事件
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/// </summary>
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/// <param name="sender">对象</param>
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/// <param name="image">图片</param>
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public delegate void OnImageChanged(object sender, Image image);
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/// <summary>
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/// 图片切换事件
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/// </summary>
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public event OnImageChanged ImageChanged;
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private readonly Timer timer;
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private Image image;
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private int ImageCount => image == null ? 0 : image.GifFrameCount();
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/// <summary>
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/// 图片是否是GIF图片
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/// </summary>
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public bool IsGif => ImageCount > 0;
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/// <summary>
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/// 图片
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/// </summary>
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public Image Image
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{
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get => image;
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set
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{
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Active = false;
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image = value;
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if (IsGif)
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{
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int delay = image.GifFrameInterval();
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if (delay > 0)
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{
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timer.Interval = delay;
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}
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}
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}
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}
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/// <summary>
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/// 刷新
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/// </summary>
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public void Invalidate()
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{
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if (!Active)
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{
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Active = true;
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}
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}
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private int FrameIndex;
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private bool active;
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/// <summary>
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/// 图片动画
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/// </summary>
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public bool Active
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{
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get => active;
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set
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{
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FrameIndex = 0;
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active = value;
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timer.Enabled = value;
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}
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}
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}
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/// <summary>
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/// GIF图片帮助类
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/// </summary>
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public static class GifHelper
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{
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/// <summary>
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/// 获取图像框架的维度
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/// </summary>
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/// <param name="img">图片</param>
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/// <returns>图像框架的维度</returns>
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public static FrameDimension GifFrameDimension(this Image img)
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{
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return new FrameDimension(img.FrameDimensionsList[0]);
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}
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/// <summary>
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/// 获取图像的帧数
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/// </summary>
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/// <param name="img">图像</param>
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/// <returns>帧数</returns>
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public static int GifFrameCount(this Image img)
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{
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if (img == null) return 0;
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FrameDimension fd = new FrameDimension(img.FrameDimensionsList[0]);
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return img.GetFrameCount(fd);
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}
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/// <summary>
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/// 获取图像的帧间隔
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/// </summary>
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/// <param name="img">图像</param>
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/// <returns>帧间隔</returns>
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public static int GifFrameInterval(this Image img)
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{
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FrameDimension dim = new FrameDimension(img.FrameDimensionsList[0]);
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int frameCount = img.GetFrameCount(dim);
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if (frameCount <= 1)
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return 0;
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int delay = 0;
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bool stop = false;
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for (int i = 0; i < frameCount; i++)//遍历图像帧
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{
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if (stop) break;
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img.SelectActiveFrame(dim, i);//激活当前帧
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for (int j = 0; j < img.PropertyIdList.Length; j++)//遍历帧属性
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{
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if ((int)img.PropertyIdList.GetValue(j) == 0x5100)//如果是延迟时间
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{
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PropertyItem pItem = (PropertyItem)img.PropertyItems.GetValue(j);//获取延迟时间属性
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byte[] delayByte = new byte[4];//延迟时间，以1/100秒为单位
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delayByte[0] = pItem.Value[i * 4];
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delayByte[1] = pItem.Value[1 + i * 4];
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delayByte[2] = pItem.Value[2 + i * 4];
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delayByte[3] = pItem.Value[3 + i * 4];
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delay = BitConverter.ToInt32(delayByte, 0) * 10; //乘以10，获取到毫秒
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stop = true;
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break;
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}
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}
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}
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return delay;
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}
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}
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}
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