329 lines
9.0 KiB
JavaScript
329 lines
9.0 KiB
JavaScript
const {each, isFn, isNum, dom, includes, compact} = require('../../util');
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const event = require('../../core/event');
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const resource = require('../../core/resource');
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const allsettings = require('../../core/settings');
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const store = require('../../core/store');
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const win = global.window;
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const settings = Object.assign({
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enabled: true
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}, allsettings.preview);
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const tplOverlay =
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`<div id="pv-overlay">
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<div id="pv-container"></div>
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<div id="pv-spinner"><img class="back"/><img class="spinner" src="${resource.image('spinner')}"/></div>
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<div id="pv-prev-area" class="hof"><img src="${resource.image('preview-prev')}"/></div>
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<div id="pv-next-area" class="hof"><img src="${resource.image('preview-next')}"/></div>
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<div id="pv-bottombar" class="clearfix hof">
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<ul id="pv-buttons">
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<li id="pv-bar-close" class="bar-right bar-button"><img src="${resource.image('preview-close')}"/></li>
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<li id="pv-bar-raw" class="bar-right"><a class="bar-button" target="_blank"><img src="${resource.image('preview-raw')}"/></a></li>
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<li id="pv-bar-fullscreen" class="bar-right bar-button"><img src="${resource.image('preview-fullscreen')}"/></li>
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<li id="pv-bar-next" class="bar-right bar-button"><img src="${resource.image('preview-next')}"/></li>
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<li id="pv-bar-idx" class="bar-right bar-label"></li>
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<li id="pv-bar-prev" class="bar-right bar-button"><img src="${resource.image('preview-prev')}"/></li>
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</ul>
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</div>
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</div>`;
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const storekey = 'ext/preview';
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let isFullscreen = store.get(storekey) || false;
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let userAliveTimeoutId = null;
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let onIndexChange = null;
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let onAdjustSize = null;
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let spinnerVisible = false;
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let spinnerTimeoutId;
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const adjustSize = () => {
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const docEl = win.document.documentElement;
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const winWidth = docEl.clientWidth;
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const winHeight = docEl.clientHeight;
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const margin = isFullscreen ? 0 : 20;
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const barHeight = isFullscreen ? 0 : 48;
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dom('#pv-container').css({
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width: winWidth - 2 * margin + 'px',
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height: winHeight - 2 * margin - barHeight + 'px',
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left: margin + 'px',
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top: margin + 'px'
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});
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dom('#pv-spinner').css({
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left: winWidth * 0.5 + 'px',
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top: winHeight * 0.5 + 'px'
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});
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if (isFullscreen) {
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dom('#pv-overlay').addCls('fullscreen');
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dom('#pv-bar-fullscreen').find('img').attr('src', resource.image('preview-no-fullscreen'));
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} else {
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dom('#pv-overlay').rmCls('fullscreen');
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dom('#pv-bar-fullscreen').find('img').attr('src', resource.image('preview-fullscreen'));
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}
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if (isFn(onAdjustSize)) {
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onAdjustSize();
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}
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};
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const setLabels = labels => {
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dom('#pv-buttons .bar-left').rm();
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each(labels, label => {
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dom('<li></li>')
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.addCls('bar-left')
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.addCls('bar-label')
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.text(label)
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.appTo('#pv-buttons');
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});
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};
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const onNext = () => {
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if (isFn(onIndexChange)) {
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onIndexChange(1);
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}
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};
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const onPrevious = () => {
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if (isFn(onIndexChange)) {
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onIndexChange(-1);
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}
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};
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const userAlive = () => {
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const $hof = dom('#pv-overlay .hof');
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win.clearTimeout(userAliveTimeoutId);
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$hof.show();
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if (isFullscreen) {
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userAliveTimeoutId = win.setTimeout(() => $hof.hide(), 2000);
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}
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};
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const onFullscreen = () => {
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isFullscreen = !isFullscreen;
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store.put(storekey, isFullscreen);
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userAlive();
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adjustSize();
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};
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const dropEvent = ev => {
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ev.stopPropagation();
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ev.preventDefault();
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};
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const onKeydown = ev => {
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const key = ev.keyCode;
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if (key === 27) { // esc
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dropEvent(ev);
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onExit(); // eslint-disable-line no-use-before-define
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} else if (key === 8 || key === 37) { // backspace, left
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dropEvent(ev);
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onPrevious();
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} else if (key === 13 || key === 32 || key === 39) { // enter, space, right
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dropEvent(ev);
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onNext();
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} else if (key === 70) { // f
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dropEvent(ev);
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onFullscreen();
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}
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};
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const onEnter = () => {
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setLabels([]);
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dom('#pv-container').clr();
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dom('#pv-overlay').show();
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dom(win).on('keydown', onKeydown);
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adjustSize();
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};
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const onExit = () => {
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setLabels([]);
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dom('#pv-container').clr();
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dom('#pv-overlay').hide();
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dom(win).off('keydown', onKeydown);
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};
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const setIndex = (idx, total) => {
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if (isNum(idx)) {
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dom('#pv-bar-idx').text(String(idx) + (isNum(total) ? '/' + String(total) : '')).show();
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} else {
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dom('#pv-bar-idx').text('').hide();
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}
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};
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const setRawLink = href => {
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if (href) {
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dom('#pv-bar-raw').show().find('a').attr('href', href);
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} else {
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dom('#pv-bar-raw').hide().find('a').attr('href', '#');
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}
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};
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const setOnIndexChange = fn => {
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onIndexChange = fn;
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};
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const setOnAdjustSize = fn => {
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onAdjustSize = fn;
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};
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const showSpinner = (show, src, delay) => {
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win.clearTimeout(spinnerTimeoutId);
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const $spinner = dom('#pv-spinner');
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if (!show) {
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spinnerVisible = false;
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$spinner.hide();
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return;
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}
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if (!spinnerVisible && delay) {
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spinnerTimeoutId = win.setTimeout(() => showSpinner(true, src), delay);
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return;
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}
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const $back = $spinner.find('.back');
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if (src) {
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$back.attr('src', src).show();
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} else {
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$back.hide();
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}
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spinnerVisible = true;
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$spinner.show();
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};
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const centerContent = () => {
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const $container = dom('#pv-container');
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const container = $container[0];
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const content = $container.children()[0];
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if (!container || !content) {
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return;
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}
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const containerW = container.offsetWidth;
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const containerH = container.offsetHeight;
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const contentW = content.offsetWidth;
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const contentH = content.offsetHeight;
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dom(content).css({
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left: (containerW - contentW) * 0.5 + 'px',
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top: (containerH - contentH) * 0.5 + 'px'
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});
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};
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const state = (items, idx, load, adjust) => {
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const inst = Object.assign(Object.create(state.prototype), {items, load, adjust});
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inst.setIdx(idx);
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setOnAdjustSize(adjust);
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setOnIndexChange(delta => inst.moveIdx(delta));
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onEnter();
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return {
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get item() {
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return inst.item;
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}
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};
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};
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state.prototype = {
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setIdx(idx) {
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this.idx = (idx + this.items.length) % this.items.length;
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this.item = this.items[this.idx];
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this.updateGui();
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this.updateContent();
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},
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moveIdx(delta) {
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this.setIdx(this.idx + delta);
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},
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updateGui() {
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setLabels([this.item.label]);
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setIndex(this.idx + 1, this.items.length);
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setRawLink(this.item.absHref);
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},
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updateContent() {
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const item = this.item;
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Promise.resolve()
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.then(() => {
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dom('#pv-container').hide().clr();
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showSpinner(true, item.thumbSquare || item.icon, 200);
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})
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.then(() => this.load(item))
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// delay for testing
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// .then(x => new Promise(resolve => setTimeout(() => resolve(x), 1000)))
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.then($content => {
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if (item !== this.item) {
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return;
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}
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showSpinner(false);
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dom('#pv-container').clr().app($content).show();
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this.adjust();
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});
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}
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};
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const register = (types, enter) => {
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const initItem = item => {
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if (item.$view && includes(types, item.type)) {
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item.$view.find('a').on('click', ev => {
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ev.preventDefault();
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const matchedItems = compact(dom('#items .item').map(el => {
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const matchedItem = el._item;
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return includes(types, matchedItem.type) ? matchedItem : null;
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}));
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enter(matchedItems, matchedItems.indexOf(item));
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});
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}
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};
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event.sub('view.changed', added => each(added, initItem));
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};
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const init = () => {
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if (!settings.enabled) {
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return;
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}
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dom(tplOverlay)
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.hide()
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.appTo('body')
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.on('keydown', onKeydown)
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.on('mousemove', userAlive)
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.on('mousedown', userAlive)
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.on('click', ev => {
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if (ev.target.id === 'pv-overlay' || ev.target.id === 'pv-container') {
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onExit();
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}
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})
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.on('mousedown', dropEvent)
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.on('mousemove', dropEvent)
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.on('keydown', dropEvent)
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.on('keypress', dropEvent);
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dom('#pv-spinner').hide();
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dom('#pv-bar-prev, #pv-prev-area').on('click', onPrevious);
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dom('#pv-bar-next, #pv-next-area').on('click', onNext);
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dom('#pv-bar-close').on('click', onExit);
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dom('#pv-bar-fullscreen').on('click', onFullscreen);
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dom(win)
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.on('resize', adjustSize)
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.on('load', adjustSize);
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};
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init();
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module.exports = {
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setLabels,
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centerContent,
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state,
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register
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};
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