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src/Tizen.UIExtensions.Common/Animation/Animation.cs

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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 Tizen.UIExtensions.Common.Internal
+{
+    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;
+        }
+
+        internal void ResetChildren()
+        {
+            foreach (var anim in _children)
+                anim._finishedTriggered = false;
+        }
+
+        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;
+        }
+    }
+}