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0a4047ab31
Unfortunately the babel minify-mangle plugin seems to be abandoned and in certain circumstances can be very buggy. The only safe options are to disable it, or to switch to a different minification library. Not minifying our javascript is not ideal, so this commit updates the javascript tasks to use a rollup, combined with babel, and terser. Babel still converts code from ES/UMD/AMD to AMD modules with the relevant browser support, whilst terser minifies the code. The rollup bundler handles tracking and creation of sourcemaps, and supports better parallelisation of the tasks. Since the upgrade to Node LTS/Gallium requires an upgrade to @babel/core and eslint, which change the built files anyway, this seems like the ideal time to make this change.
16 lines
2.4 KiB
JavaScript
16 lines
2.4 KiB
JavaScript
/*
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* JavaScript to provide automatic scrolling, e.g. during a drag operation.
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*
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* Note: this module is defined statically. It is a singleton. You
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* can only have one use of it active at any time. However, since this
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* is usually used in relation to drag-drop, and since you only ever
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* drag one thing at a time, this is not a problem in practice.
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*
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* @module core/autoscroll
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* @copyright 2016 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @since 3.6
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*/
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define("core/autoscroll",["jquery"],(function($){var autoscroll={SCROLL_THRESHOLD:30,SCROLL_FREQUENCY:1e3/60,SCROLL_SPEED:.5,scrollingId:null,scrollAmount:0,callback:null,start:function(callback){$(window).on("mousemove",autoscroll.mouseMove),$(window).on("touchmove",autoscroll.touchMove),autoscroll.callback=callback},stop:function(){$(window).off("mousemove",autoscroll.mouseMove),$(window).off("touchmove",autoscroll.touchMove),null!==autoscroll.scrollingId&&autoscroll.stopScrolling()},touchMove:function(e){for(var i=0;i<e.changedTouches.length;i++)autoscroll.handleMove(e.changedTouches[i].clientX,e.changedTouches[i].clientY)},mouseMove:function(e){autoscroll.handleMove(e.clientX,e.clientY)},handleMove:function(clientX,clientY){clientY<autoscroll.SCROLL_THRESHOLD?autoscroll.scrollAmount=-Math.min(autoscroll.SCROLL_THRESHOLD-clientY,autoscroll.SCROLL_THRESHOLD):clientY>$(window).height()-autoscroll.SCROLL_THRESHOLD?autoscroll.scrollAmount=Math.min(clientY-($(window).height()-autoscroll.SCROLL_THRESHOLD),autoscroll.SCROLL_THRESHOLD):autoscroll.scrollAmount=0,autoscroll.scrollAmount&&null===autoscroll.scrollingId?autoscroll.startScrolling():autoscroll.scrollAmount||null===autoscroll.scrollingId||autoscroll.stopScrolling()},startScrolling:function(){var maxScroll=$(document).height()-$(window).height();autoscroll.scrollingId=window.setInterval((function(){var y=$(window).scrollTop(),offset=Math.round(autoscroll.scrollAmount*autoscroll.SCROLL_SPEED);if(y+offset<0&&(offset=-y),y+offset>maxScroll&&(offset=maxScroll-y),0!==offset){$(window).scrollTop(y+offset);var realOffset=$(window).scrollTop()-y;0!==realOffset&&autoscroll.callback&&autoscroll.callback(realOffset)}}),autoscroll.SCROLL_FREQUENCY)},stopScrolling:function(){window.clearInterval(autoscroll.scrollingId),autoscroll.scrollingId=null}};return{start:autoscroll.start,stop:autoscroll.stop}}));
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//# sourceMappingURL=autoscroll.min.js.map
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