51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
"use strict"
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var coreRenderer = require("../render/render")
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function throttle(callback) {
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//60fps translates to 16.6ms, round it down since setTimeout requires int
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var delay = 16
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var last = 0, pending = null
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var timeout = typeof requestAnimationFrame === "function" ? requestAnimationFrame : setTimeout
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return function() {
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var elapsed = Date.now() - last
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if (pending === null) {
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pending = timeout(function() {
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pending = null
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callback()
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last = Date.now()
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}, delay - elapsed)
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}
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}
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}
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module.exports = function($window, throttleMock) {
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var renderService = coreRenderer($window)
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renderService.setEventCallback(function(e) {
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if (e.redraw === false) e.redraw = undefined
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else redraw()
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})
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var callbacks = []
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var rendering = false
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function subscribe(key, callback) {
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unsubscribe(key)
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callbacks.push(key, callback)
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}
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function unsubscribe(key) {
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var index = callbacks.indexOf(key)
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if (index > -1) callbacks.splice(index, 2)
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}
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function sync() {
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if (rendering) throw new Error("Nested m.redraw.sync() call")
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rendering = true
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for (var i = 1; i < callbacks.length; i+=2) try {callbacks[i]()} catch (e) {if (typeof console !== "undefined") console.error(e)}
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rendering = false
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}
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var redraw = (throttleMock || throttle)(sync)
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redraw.sync = sync
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return {subscribe: subscribe, unsubscribe: unsubscribe, redraw: redraw, render: renderService.render}
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}
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