162 lines
8.0 KiB
JavaScript
162 lines
8.0 KiB
JavaScript
(function(requirejs, require, define) {
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define(['edx-ui-toolkit/js/utils/html-utils'], function(HtmlUtils) {
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return Scroller;
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function Scroller(state) {
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var $parentEl, $moveLeftEl, $showEl, $moveRightEl, showElLeftMargin;
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$parentEl = $(HtmlUtils.HTML(
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'<div style=" width: 665px; height: 102px; margin-left: auto; margin-right: auto; " ></div>'
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).toString());
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$moveLeftEl = $(HtmlUtils.joinHtml(
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HtmlUtils.HTML('<div style=" width: 40px; height: 102px; display: inline; float: left; " >'),
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HtmlUtils.HTML('<div style=" width: 38px; height: 100px; border: 1px solid #CCC; '),
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HtmlUtils.HTML('background-color: #EEE; '),
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HtmlUtils.HTML('background-image: -webkit-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: -moz-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: -ms-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: -o-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('-webkit-box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset; '),
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HtmlUtils.HTML('box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset; '),
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// eslint-disable-next-line no-undef
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HtmlUtils.HTML("background-image: url('"), baseUrl,
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HtmlUtils.HTML("images/arrow-left.png'); "),
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HtmlUtils.HTML('background-position: center center; '),
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HtmlUtils.HTML('background-repeat: no-repeat; " >'),
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HtmlUtils.HTML('</div>'),
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HtmlUtils.HTML('</div>')
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).toString());
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$moveLeftEl.appendTo($parentEl);
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// The below is necessary to prevent the browser thinking that we want
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// to perform a drag operation, or a highlight operation. If we don't
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// do this, the browser will then highlight with a gray shade the
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// element.
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$moveLeftEl.mousemove(function(event) { event.preventDefault(); });
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$moveLeftEl.mousedown(function(event) { event.preventDefault(); });
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// This event will be responsible for moving the scroller left.
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// Hidden draggables will be shown.
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$moveLeftEl.mouseup(function(event) {
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event.preventDefault();
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// When there are no more hidden draggables, prevent from
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// scrolling infinitely.
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if (showElLeftMargin > -102) {
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return;
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}
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showElLeftMargin += 102;
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// We scroll by changing the 'margin-left' CSS property smoothly.
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state.sliderEl.animate({
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'margin-left': showElLeftMargin + 'px'
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}, 100, function() {
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updateArrowOpacity();
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});
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});
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$showEl = $(HtmlUtils.HTML(
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'<div style=" width: 585px; height: 102px; overflow: hidden; display: inline; float: left; " ></div>'
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).toString());
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$showEl.appendTo($parentEl);
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showElLeftMargin = 0;
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// Element where the draggables will be contained. It is very long
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// so that any SANE number of draggables will fit in a single row. It
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// will be contained in a parent element whose 'overflow' CSS value
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// will be hidden, preventing the long row from fully being visible.
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// eslint-disable-next-line no-param-reassign
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state.sliderEl = $(HtmlUtils.joinHtml(
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HtmlUtils.HTML('<div style=" width: 20000px; height: 100px; border-top: 1px solid #CCC; '),
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HtmlUtils.HTML('border-bottom: 1px solid #CCC; " ></div>')
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).toString());
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state.sliderEl.appendTo($showEl);
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state.sliderEl.mousedown(function(event) {
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event.preventDefault();
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});
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$moveRightEl = $(HtmlUtils.joinHtml(
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HtmlUtils.HTML('<div style=" width: 40px; height: 102px; display: inline; float: left; " >'),
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HtmlUtils.HTML('<div style=" width: 38px; height: 100px; border: 1px solid #CCC; '),
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HtmlUtils.HTML('background-color: #EEE; '),
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HtmlUtils.HTML('background-image: -webkit-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: -moz-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: -ms-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: -o-linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('background-image: linear-gradient(top, #EEE, #DDD); '),
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HtmlUtils.HTML('-webkit-box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset; '),
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HtmlUtils.HTML('box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset; '),
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// eslint-disable-next-line no-undef
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HtmlUtils.HTML("background-image: url('"), baseUrl,
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HtmlUtils.HTML("images/arrow-right.png'); "),
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HtmlUtils.HTML('background-position: center center; '),
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HtmlUtils.HTML('background-repeat: no-repeat; " >'),
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HtmlUtils.HTML('</div>'),
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HtmlUtils.HTML('</div>')
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).toString());
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$moveRightEl.appendTo($parentEl);
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// The below is necessary to prevent the browser thinking that we want
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// to perform a drag operation, or a highlight operation. If we don't
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// do this, the browser will then highlight with a gray shade the
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// element.
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$moveRightEl.mousemove(function(event) { event.preventDefault(); });
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$moveRightEl.mousedown(function(event) { event.preventDefault(); });
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// This event will be responsible for moving the scroller right.
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// Hidden draggables will be shown.
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$moveRightEl.mouseup(function(event) {
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event.preventDefault();
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// When there are no more hidden draggables, prevent from
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// scrolling infinitely.
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if (showElLeftMargin < -102 * (state.numDraggablesInSlider - 6)) {
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return;
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}
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showElLeftMargin -= 102;
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// We scroll by changing the 'margin-left' CSS property smoothly.
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state.sliderEl.animate({
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'margin-left': showElLeftMargin + 'px'
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}, 100, function() {
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updateArrowOpacity();
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});
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});
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$parentEl.appendTo(state.containerEl);
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// Make the function available throughout the application. We need to
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// call it in several places:
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//
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// 1.) When initially reading answer from server, if draggables will be
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// positioned on the base image, the scroller's right and left arrows
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// opacity must be updated.
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//
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// 2.) When creating draggable elements, the scroller's right and left
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// arrows opacity must be updated according to the number of
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// draggables.
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state.updateArrowOpacity = updateArrowOpacity;
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return;
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function updateArrowOpacity() {
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$moveLeftEl.children('div').css('opacity', '1');
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$moveRightEl.children('div').css('opacity', '1');
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if (showElLeftMargin < -102 * (state.numDraggablesInSlider - 6)) {
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$moveRightEl.children('div').css('opacity', '.4');
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}
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if (showElLeftMargin > -102) {
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$moveLeftEl.children('div').css('opacity', '.4');
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}
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}
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} // End-of: function Scroller(state)
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}); // End-of: define([], function () {
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}(RequireJS.requirejs, RequireJS.require, RequireJS.define)); // End-of: (function (requirejs, require, define) {
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