namespace DysncPicTest
{
    public partial class Form1 : Form
    {
        private Image m_imgImage = null;
        private EventHandler m_evthdlAnimator = null;
        public Form1()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.UserPaint, true);
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);

            m_evthdlAnimator = new EventHandler(OnImageAnimate);
            Debug.Assert(m_evthdlAnimator != null);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            if (m_imgImage != null)
            {
                UpdateImage();
                e.Graphics.DrawImage(m_imgImage, new Rectangle(100, 100, m_imgImage.Width, m_imgImage.Height));
            }
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            m_imgImage = Image.FromFile("1.gif"); // 加載測(cè)試用的Gif圖片
            BeginAnimate();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
             if (m_imgImage != null)
            {
                StopAnimate();
                m_imgImage = null;
            }
        }

        private void BeginAnimate()
        {
           if (m_imgImage == null)
                return;

           if (ImageAnimator.CanAnimate(m_imgImage))
           {
                ImageAnimator.Animate(m_imgImage,m_evthdlAnimator);
           }
        }

        private void StopAnimate()
        {
            if (m_imgImage == null)
                return;

            if (ImageAnimator.CanAnimate(m_imgImage))
            {
                ImageAnimator.StopAnimate(m_imgImage,m_evthdlAnimator);
            }
        }

        private void UpdateImage()
        {
            if (m_imgImage == null)
                return;

            if (ImageAnimator.CanAnimate(m_imgImage))
            {
                ImageAnimator.UpdateFrames(m_imgImage);
            }
        }

        private void OnImageAnimate(Object sender,EventArgs e)
        {
            this.Invalidate();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}