继承PictureBox显示GIF的自定义控件实现

处理GIF部分

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;


namespace AnimatePaint
{
    /// <summary>
    /// 处理gif动画
    /// </summary>
    public class AnimateImage
    {
        private Image _image;
        private FrameDimension _frameDimension;
        private bool _bCanAnimate;
        private int _iFrameCount = 1, _iCurrentFrame = 0;
        
        public event EventHandler OnFrameChanged;
        public Image Image { get { return _image;} }
        public bool CanAnimate { get { return _bCanAnimate;} }
        public int FrameCount { get { return _iFrameCount; } }
        public int CurrentFrame { get { return _iCurrentFrame; } }


        private void FrameChanged(object sender, EventArgs e)
        {
            _iCurrentFrame = _iCurrentFrame + 1 >= _iFrameCount ? 0 : _iCurrentFrame + 1;
            lock (_image)
            {
                _image.SelectActiveFrame(_frameDimension, _iCurrentFrame);
                if (OnFrameChanged != null)
                {
                    OnFrameChanged(sender, e);
                }
            }
        }


        public AnimateImage(Image img)
        {
            _image = img;
            lock (_image)
            {
                _bCanAnimate = ImageAnimator.CanAnimate(_image);
                if (_bCanAnimate)
                {
                    Guid[] guids = _image.FrameDimensionsList;
                    _frameDimension = new FrameDimension(guids[0]);
                    _iFrameCount = _image.GetFrameCount(_frameDimension);
                }
            }
        }


        public void Play()
        {
            if (_bCanAnimate)
            {
                lock (_image)
                {
                    ImageAnimator.Animate(_image, new EventHandler(FrameChanged));
                }
            }
        }


        public void Stop()
        {
            if (_bCanAnimate)
            {
                lock (_image)
                {
                    ImageAnimator.StopAnimate(_image, new EventHandler(FrameChanged));
                }
            }
        }
        
        public void Reset()
        {
            if (_bCanAnimate)
            {
                ImageAnimator.StopAnimate(_image, new EventHandler(FrameChanged));
                lock (_image)
                {
                    _image.SelectActiveFrame(_frameDimension, 0);
                    _iCurrentFrame = 0;
                }
            }
        }
        
    }
}

自定义控件部分

 

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace AnimatePicture
{
    public partial class AnimatePictureBox : PictureBox
    {
        private AnimatePaint.AnimateImage _animateimg;
        
        private void image_OnFrameChanged(object sender, EventArgs e)
        {
            Invalidate();
        }

        public AnimatePictureBox()
        {
            SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
        }

        public void LoadGIF(string strFileName)
        {
            _animateimg = new AnimatePaint.AnimateImage(Image.FromFile(strFileName));
            _animateimg.OnFrameChanged += new EventHandler(image_OnFrameChanged);
            _animateimg.Play();
        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
            if (_animateimg != null)
                if (_animateimg.Image != null)
                    lock (_animateimg.Image)
                    {
                        pe.Graphics.DrawImage(_animateimg.Image, new Point(0, 0));
                    }
        }
    }
}