1 files changed, 85 insertions, 0 deletions
diff --git a/src/animation/Animator.js b/src/animation/Animator.js
new file mode 100644
index 0000000..fdb2326
--- /dev/null
+++ b/src/animation/Animator.js
@@ -0,0 +1,85 @@
+import Queue from './Queue.js'
+
+const Animator = {
+  nextDraw: null,
+  frames: new Queue(),
+  timeouts: new Queue(),
+  timer: window.performance || window.Date,
+  transforms: [],
+
+  frame (fn) {
+    // Store the node
+    var node = Animator.frames.push({ run: fn })
+
+    // Request an animation frame if we don't have one
+    if (Animator.nextDraw === null) {
+      Animator.nextDraw = window.requestAnimationFrame(Animator._draw)
+    }
+
+    // Return the node so we can remove it easily
+    return node
+  },
+
+  transform_frame (fn, id) {
+    Animator.transforms[id] = fn
+  },
+
+  timeout (fn, delay) {
+    delay = delay || 0
+
+    // Work out when the event should fire
+    var time = Animator.timer.now() + delay
+
+    // Add the timeout to the end of the queue
+    var node = Animator.timeouts.push({ run: fn, time: time })
+
+    // Request another animation frame if we need one
+    if (Animator.nextDraw === null) {
+      Animator.nextDraw = window.requestAnimationFrame(Animator._draw)
+    }
+
+    return node
+  },
+
+  cancelFrame (node) {
+    Animator.frames.remove(node)
+  },
+
+  clearTimeout (node) {
+    Animator.timeouts.remove(node)
+  },
+
+  _draw (now) {
+    // Run all the timeouts we can run, if they are not ready yet, add them
+    // to the end of the queue immediately! (bad timeouts!!! [sarcasm])
+    var nextTimeout = null
+    var lastTimeout = Animator.timeouts.last()
+    while ((nextTimeout = Animator.timeouts.shift())) {
+      // Run the timeout if its time, or push it to the end
+      if (now >= nextTimeout.time) {
+        nextTimeout.run()
+      } else {
+        Animator.timeouts.push(nextTimeout)
+      }
+
+      // If we hit the last item, we should stop shifting out more items
+      if (nextTimeout === lastTimeout) break
+    }
+
+    // Run all of the animation frames
+    var nextFrame = null
+    var lastFrame = Animator.frames.last()
+    while ((nextFrame !== lastFrame) && (nextFrame = Animator.frames.shift())) {
+      nextFrame.run()
+    }
+
+    Animator.transforms.forEach(function (el) { el() })
+
+    // If we have remaining timeouts or frames, draw until we don't anymore
+    Animator.nextDraw = Animator.timeouts.first() || Animator.frames.first()
+      ? window.requestAnimationFrame(Animator._draw)
+      : null
+  }
+}
+
+export default Animator