59 lines
1.9 KiB
JavaScript
59 lines
1.9 KiB
JavaScript
/* Copyright (c) 2015 Hyunje Alex Jun and other contributors
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* Licensed under the MIT License
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*/
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'use strict';
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var h = require('../../lib/helper')
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, instances = require('../instances')
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, updateGeometry = require('../update-geometry');
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function bindClickRailHandler(element, i) {
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function pageOffset(el) {
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return el.getBoundingClientRect();
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}
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var stopPropagation = window.Event.prototype.stopPropagation.bind;
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i.event.bind(i.scrollbarY, 'click', stopPropagation);
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i.event.bind(i.scrollbarYRail, 'click', function (e) {
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var halfOfScrollbarLength = h.toInt(i.scrollbarYHeight / 2);
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var positionTop = i.railYRatio * (e.pageY - window.scrollY - pageOffset(i.scrollbarYRail).top - halfOfScrollbarLength);
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var maxPositionTop = i.railYRatio * (i.railYHeight - i.scrollbarYHeight);
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var positionRatio = positionTop / maxPositionTop;
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if (positionRatio < 0) {
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positionRatio = 0;
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} else if (positionRatio > 1) {
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positionRatio = 1;
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}
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element.scrollTop = (i.contentHeight - i.containerHeight) * positionRatio;
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updateGeometry(element);
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e.stopPropagation();
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});
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i.event.bind(i.scrollbarX, 'click', stopPropagation);
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i.event.bind(i.scrollbarXRail, 'click', function (e) {
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var halfOfScrollbarLength = h.toInt(i.scrollbarXWidth / 2);
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var positionLeft = i.railXRatio * (e.pageX - window.scrollX - pageOffset(i.scrollbarXRail).left - halfOfScrollbarLength);
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var maxPositionLeft = i.railXRatio * (i.railXWidth - i.scrollbarXWidth);
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var positionRatio = positionLeft / maxPositionLeft;
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if (positionRatio < 0) {
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positionRatio = 0;
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} else if (positionRatio > 1) {
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positionRatio = 1;
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}
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element.scrollLeft = ((i.contentWidth - i.containerWidth) * positionRatio) - i.negativeScrollAdjustment;
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updateGeometry(element);
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e.stopPropagation();
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});
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}
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module.exports = function (element) {
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var i = instances.get(element);
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bindClickRailHandler(element, i);
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};
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