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https://github.com/Jermolene/TiddlyWiki5
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60 lines
1.4 KiB
JavaScript
60 lines
1.4 KiB
JavaScript
/*\
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title: $:/core/modules/utils/dom/scroller.js
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type: application/javascript
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module-type: utils
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Plugin that creates a $tw.utils.Scroller object prototype that manages scrolling in the browser
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var slowInSlowOut = function(t) {
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return (1 - ((Math.cos(t * Math.PI) + 1) / 2));
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};
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/*
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Creates a Scroller object
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*/
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var Scroller = function() {
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};
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Scroller.prototype.cancel = function() {
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if(this.timerId) {
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window.clearInterval(this.timerId);
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this.timerId = null;
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}
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};
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/*
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Smoothly scroll an element back into view if needed
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*/
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Scroller.prototype.scrollIntoView = function(element) {
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var scrollPosition = $tw.utils.getScrollPosition();
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this.cancel();
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this.startTime = new Date();
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this.startX = scrollPosition.x;
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this.startY = scrollPosition.y;
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this.endX = element.offsetLeft;
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this.endY = element.offsetTop;
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if((this.endX < this.startX) || (this.endX > (this.startX + window.innerWidth)) || (this.endY < this.startY) || (this.endY > (this.startY + window.innerHeight))) {
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var self = this;
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this.timerId = window.setInterval(function() {
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var t = ((new Date()) - self.startTime) / $tw.config.preferences.animationDuration;
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if(t >= 1) {
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self.cancel();
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t = 1;
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}
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t = slowInSlowOut(t);
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window.scrollTo(self.startX + (self.endX - self.startX) * t,self.startY + (self.endY - self.startY) * t);
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}, 10);
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}
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};
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exports.Scroller = Scroller;
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})();
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