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));

                    }

        }

    }

}