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https://github.com/chartjs/Chart.js.git
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5836c19ec5
The animation service now keeps track of the active animation frame request and will skip new requests until the current one is executed. This can happen when processing mouse events, e.g. 'mousemove' and 'mouseout' events will trigger multiple renders.
129 lines
4.0 KiB
JavaScript
129 lines
4.0 KiB
JavaScript
/*global window: false */
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"use strict";
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module.exports = function(Chart) {
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var helpers = Chart.helpers;
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Chart.defaults.global.animation = {
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duration: 1000,
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easing: "easeOutQuart",
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onProgress: helpers.noop,
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onComplete: helpers.noop
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};
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Chart.Animation = Chart.Element.extend({
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currentStep: null, // the current animation step
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numSteps: 60, // default number of steps
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easing: "", // the easing to use for this animation
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render: null, // render function used by the animation service
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onAnimationProgress: null, // user specified callback to fire on each step of the animation
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onAnimationComplete: null // user specified callback to fire when the animation finishes
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});
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Chart.animationService = {
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frameDuration: 17,
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animations: [],
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dropFrames: 0,
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request: null,
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addAnimation: function(chartInstance, animationObject, duration, lazy) {
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if (!lazy) {
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chartInstance.animating = true;
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}
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for (var index = 0; index < this.animations.length; ++index) {
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if (this.animations[index].chartInstance === chartInstance) {
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// replacing an in progress animation
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this.animations[index].animationObject = animationObject;
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return;
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}
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}
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this.animations.push({
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chartInstance: chartInstance,
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animationObject: animationObject
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});
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// If there are no animations queued, manually kickstart a digest, for lack of a better word
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if (this.animations.length === 1) {
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this.requestAnimationFrame();
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}
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},
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// Cancel the animation for a given chart instance
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cancelAnimation: function(chartInstance) {
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var index = helpers.findIndex(this.animations, function(animationWrapper) {
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return animationWrapper.chartInstance === chartInstance;
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});
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if (index !== -1) {
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this.animations.splice(index, 1);
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chartInstance.animating = false;
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}
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},
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requestAnimationFrame: function() {
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var me = this;
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if (me.request === null) {
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// Skip animation frame requests until the active one is executed.
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// This can happen when processing mouse events, e.g. 'mousemove'
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// and 'mouseout' events will trigger multiple renders.
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me.request = helpers.requestAnimFrame.call(window, function() {
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me.request = null;
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me.startDigest();
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});
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}
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},
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startDigest: function() {
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var startTime = Date.now();
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var framesToDrop = 0;
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if (this.dropFrames > 1) {
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framesToDrop = Math.floor(this.dropFrames);
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this.dropFrames = this.dropFrames % 1;
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}
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var i = 0;
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while (i < this.animations.length) {
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if (this.animations[i].animationObject.currentStep === null) {
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this.animations[i].animationObject.currentStep = 0;
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}
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this.animations[i].animationObject.currentStep += 1 + framesToDrop;
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if (this.animations[i].animationObject.currentStep > this.animations[i].animationObject.numSteps) {
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this.animations[i].animationObject.currentStep = this.animations[i].animationObject.numSteps;
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}
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this.animations[i].animationObject.render(this.animations[i].chartInstance, this.animations[i].animationObject);
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if (this.animations[i].animationObject.onAnimationProgress && this.animations[i].animationObject.onAnimationProgress.call) {
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this.animations[i].animationObject.onAnimationProgress.call(this.animations[i].chartInstance, this.animations[i]);
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}
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if (this.animations[i].animationObject.currentStep === this.animations[i].animationObject.numSteps) {
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if (this.animations[i].animationObject.onAnimationComplete && this.animations[i].animationObject.onAnimationComplete.call) {
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this.animations[i].animationObject.onAnimationComplete.call(this.animations[i].chartInstance, this.animations[i]);
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}
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// executed the last frame. Remove the animation.
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this.animations[i].chartInstance.animating = false;
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this.animations.splice(i, 1);
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} else {
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++i;
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}
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}
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var endTime = Date.now();
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var dropFrames = (endTime - startTime) / this.frameDuration;
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this.dropFrames += dropFrames;
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// Do we have more stuff to animate?
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if (this.animations.length > 0) {
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this.requestAnimationFrame();
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}
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}
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};
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}; |