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//
// Tweener.cs
//
// Author:
// Jason Smith <jason.smith@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections;
using System.Collections.Generic;
namespace Xamarin.Forms
{
public class Animation : IEnumerable
{
readonly List<Animation> _children;
readonly Easing _easing;
readonly Action _finished;
readonly Action<double> _step;
double _beginAt;
double _finishAt;
bool _finishedTriggered;
public Animation()
{
_children = new List<Animation>();
_easing = Easing.Linear;
_step = f => { };
}
public Animation(Action<double> callback, double start = 0.0f, double end = 1.0f, Easing easing = null, Action finished = null)
{
_children = new List<Animation>();
_easing = easing ?? Easing.Linear;
_finished = finished;
Func<double, double> transform = AnimationExtensions.Interpolate(start, end);
_step = f => callback(transform(f));
}
public IEnumerator GetEnumerator()
{
return _children.GetEnumerator();
}
public void Add(double beginAt, double finishAt, Animation animation)
{
if (beginAt < 0 || beginAt > 1)
throw new ArgumentOutOfRangeException("beginAt");
if (finishAt < 0 || finishAt > 1)
throw new ArgumentOutOfRangeException("finishAt");
if (finishAt <= beginAt)
throw new ArgumentException("finishAt must be greater than beginAt");
animation._beginAt = beginAt;
animation._finishAt = finishAt;
_children.Add(animation);
}
public void Commit(IAnimatable owner, string name, uint rate = 16, uint length = 250, Easing easing = null, Action<double, bool> finished = null, Func<bool> repeat = null)
{
owner.Animate(name, this, rate, length, easing, finished, repeat);
}
public Action<double> GetCallback()
{
Action<double> result = f =>
{
_step(_easing.Ease(f));
foreach (Animation animation in _children)
{
if (animation._finishedTriggered)
continue;
double val = Math.Max(0.0f, Math.Min(1.0f, (f - animation._beginAt) / (animation._finishAt - animation._beginAt)));
if (val <= 0.0f) // not ready to process yet
continue;
Action<double> callback = animation.GetCallback();
callback(val);
if (val >= 1.0f)
{
animation._finishedTriggered = true;
if (animation._finished != null)
animation._finished();
}
}
};
return result;
}
public Animation Insert(double beginAt, double finishAt, Animation animation)
{
Add(beginAt, finishAt, animation);
return this;
}
public Animation WithConcurrent(Animation animation, double beginAt = 0.0f, double finishAt = 1.0f)
{
animation._beginAt = beginAt;
animation._finishAt = finishAt;
_children.Add(animation);
return this;
}
public Animation WithConcurrent(Action<double> callback, double start = 0.0f, double end = 1.0f, Easing easing = null, double beginAt = 0.0f, double finishAt = 1.0f)
{
var child = new Animation(callback, start, end, easing);
child._beginAt = beginAt;
child._finishAt = finishAt;
_children.Add(child);
return this;
}
}
}
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