using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace Implab.Fx
{
    public static class AnimationHelpers
    {
        public static Animation<TTarget> AnimateProperty<TTarget,TVal>(this Animation<TTarget> animation, Action<TTarget,TVal> setter, Func<TTarget,TVal> getter, TVal newValue, Func<TVal,TVal,int,int,TVal> fx) where TTarget: class
        {
            if (animation == null)
                throw new ArgumentNullException("animation");

            TVal oldValue = getter(animation.Traget);

            animation.Step += (target, elaped, duration) =>
            {
                var value = fx(oldValue, newValue, elaped, duration);
                setter(target, value);
            };

            return animation;
        }

        public static Animation<Form> AnimateTransparency(this Form ctl, float newValue)
        {
            var anim = new Animation<Form>(ctl);

            anim.AnimateProperty(
                (target, value) => target.Opacity = value,
                target => target.Opacity,
                newValue,
                (ov, nv, el, du) => ov + ((float)el / du) * (nv - ov)
            );
            return anim;
        }
    }
}