1 files changed, 175 insertions, 0 deletions
diff --git a/library/Sortable/src/Animation.js b/library/Sortable/src/Animation.js
new file mode 100644
index 000000000..6aa8e3ef8
--- /dev/null
+++ b/library/Sortable/src/Animation.js
@@ -0,0 +1,175 @@
+import { getRect, css, matrix, isRectEqual, indexOfObject } from './utils.js';
+import Sortable from './Sortable.js';
+
+export default function AnimationStateManager() {
+	let animationStates = [],
+		animationCallbackId;
+
+	return {
+		captureAnimationState() {
+			animationStates = [];
+			if (!this.options.animation) return;
+			let children = [].slice.call(this.el.children);
+
+			children.forEach(child => {
+				if (css(child, 'display') === 'none' || child === Sortable.ghost) return;
+				animationStates.push({
+					target: child,
+					rect: getRect(child)
+				});
+				let fromRect = { ...animationStates[animationStates.length - 1].rect };
+
+				// If animating: compensate for current animation
+				if (child.thisAnimationDuration) {
+					let childMatrix = matrix(child, true);
+					if (childMatrix) {
+						fromRect.top -= childMatrix.f;
+						fromRect.left -= childMatrix.e;
+					}
+				}
+
+				child.fromRect = fromRect;
+			});
+		},
+
+		addAnimationState(state) {
+			animationStates.push(state);
+		},
+
+		removeAnimationState(target) {
+			animationStates.splice(indexOfObject(animationStates, { target }), 1);
+		},
+
+		animateAll(callback) {
+			if (!this.options.animation) {
+				clearTimeout(animationCallbackId);
+				if (typeof(callback) === 'function') callback();
+				return;
+			}
+
+			let animating = false,
+				animationTime = 0;
+
+			animationStates.forEach((state) => {
+				let time = 0,
+					animatingThis = false,
+					target = state.target,
+					fromRect = target.fromRect,
+					toRect = getRect(target),
+					prevFromRect = target.prevFromRect,
+					prevToRect = target.prevToRect,
+					animatingRect = state.rect,
+					targetMatrix = matrix(target, true);
+
+
+				if (targetMatrix) {
+					// Compensate for current animation
+					toRect.top -= targetMatrix.f;
+					toRect.left -= targetMatrix.e;
+				}
+
+				target.toRect = toRect;
+
+				if (target.thisAnimationDuration) {
+					// Could also check if animatingRect is between fromRect and toRect
+					if (
+						isRectEqual(prevFromRect, toRect) &&
+						!isRectEqual(fromRect, toRect) &&
+						// Make sure animatingRect is on line between toRect & fromRect
+						(animatingRect.top - toRect.top) /
+						(animatingRect.left - toRect.left) ===
+						(fromRect.top - toRect.top) /
+						(fromRect.left - toRect.left)
+					) {
+						// If returning to same place as started from animation and on same axis
+						time = calculateRealTime(animatingRect, prevFromRect, prevToRect, this.options);
+					}
+				}
+
+				// if fromRect != toRect: animate
+				if (!isRectEqual(toRect, fromRect)) {
+					target.prevFromRect = fromRect;
+					target.prevToRect = toRect;
+
+					if (!time) {
+						time = this.options.animation;
+					}
+					this.animate(
+						target,
+						animatingRect,
+						toRect,
+						time
+					);
+				}
+
+				if (time) {
+					animating = true;
+					animationTime = Math.max(animationTime, time);
+					clearTimeout(target.animationResetTimer);
+					target.animationResetTimer = setTimeout(function() {
+						target.animationTime = 0;
+						target.prevFromRect = null;
+						target.fromRect = null;
+						target.prevToRect = null;
+						target.thisAnimationDuration = null;
+					}, time);
+					target.thisAnimationDuration = time;
+				}
+			});
+
+
+			clearTimeout(animationCallbackId);
+			if (!animating) {
+				if (typeof(callback) === 'function') callback();
+			} else {
+				animationCallbackId = setTimeout(function() {
+					if (typeof(callback) === 'function') callback();
+				}, animationTime);
+			}
+			animationStates = [];
+		},
+
+		animate(target, currentRect, toRect, duration) {
+			if (duration) {
+				css(target, 'transition', '');
+				css(target, 'transform', '');
+				let elMatrix = matrix(this.el),
+					scaleX = elMatrix && elMatrix.a,
+					scaleY = elMatrix && elMatrix.d,
+					translateX = (currentRect.left - toRect.left) / (scaleX || 1),
+					translateY = (currentRect.top - toRect.top) / (scaleY || 1);
+
+				target.animatingX = !!translateX;
+				target.animatingY = !!translateY;
+
+				css(target, 'transform', 'translate3d(' + translateX + 'px,' + translateY + 'px,0)');
+
+				this.forRepaintDummy = repaint(target); // repaint
+
+				css(target, 'transition', 'transform ' + duration + 'ms' + (this.options.easing ? ' ' + this.options.easing : ''));
+				css(target, 'transform', 'translate3d(0,0,0)');
+				(typeof target.animated === 'number') && clearTimeout(target.animated);
+				target.animated = setTimeout(function () {
+					css(target, 'transition', '');
+					css(target, 'transform', '');
+					target.animated = false;
+
+					target.animatingX = false;
+					target.animatingY = false;
+				}, duration);
+			}
+		}
+	};
+}
+
+function repaint(target) {
+	return target.offsetWidth;
+}
+
+
+function calculateRealTime(animatingRect, fromRect, toRect, options) {
+	return (
+		Math.sqrt(Math.pow(fromRect.top - animatingRect.top, 2) + Math.pow(fromRect.left - animatingRect.left, 2)) /
+		Math.sqrt(Math.pow(fromRect.top - toRect.top, 2) + Math.pow(fromRect.left - toRect.left, 2))
+	) * options.animation;
+}