mirror of
https://github.com/hkalexling/Mango.git
synced 2025-08-02 19:05:32 -04:00
349 lines
9.0 KiB
JavaScript
349 lines
9.0 KiB
JavaScript
const readerComponent = () => {
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return {
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loading: true,
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mode: 'continuous', // Can be 'continuous', 'height' or 'width'
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msg: 'Loading the web reader. Please wait...',
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alertClass: 'uk-alert-primary',
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items: [],
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curItem: {},
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enableFlipAnimation: true,
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flipAnimation: null,
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longPages: false,
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lastSavedPage: page,
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selectedIndex: 0, // 0: not selected; 1: the first page
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margin: 30,
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preloadLookahead: 3,
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enableRightToLeft: false,
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/**
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* Initialize the component by fetching the page dimensions
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*/
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init(nextTick) {
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$.get(`${base_url}api/dimensions/${tid}/${eid}`)
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.then(data => {
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if (!data.success && data.error)
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throw new Error(resp.error);
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const dimensions = data.dimensions;
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this.items = dimensions.map((d, i) => {
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return {
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id: i + 1,
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url: `${base_url}api/page/${tid}/${eid}/${i+1}`,
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width: d.width,
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height: d.height,
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};
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});
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const avgRatio = this.items.reduce((acc, cur) => {
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return acc + cur.height / cur.width
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}, 0) / this.items.length;
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console.log(avgRatio);
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this.longPages = avgRatio > 2;
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this.loading = false;
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this.mode = localStorage.getItem('mode') || 'continuous';
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// Here we save a copy of this.mode, and use the copy as
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// the model-select value. This is because `updateMode`
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// might change this.mode and make it `height` or `width`,
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// which are not available in mode-select
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const mode = this.mode;
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this.updateMode(this.mode, page, nextTick);
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$('#mode-select').val(mode);
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const savedMargin = localStorage.getItem('margin');
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if (savedMargin) {
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this.margin = savedMargin;
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}
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// Preload Images
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this.preloadLookahead = +(localStorage.getItem('preloadLookahead') ?? 3);
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const limit = Math.min(page + this.preloadLookahead, this.items.length);
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for (let idx = page + 1; idx <= limit; idx++) {
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this.preloadImage(this.items[idx - 1].url);
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}
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const savedFlipAnimation = localStorage.getItem('enableFlipAnimation');
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this.enableFlipAnimation = savedFlipAnimation === null || savedFlipAnimation === 'true';
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const savedRightToLeft = localStorage.getItem('enableRightToLeft');
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if (savedRightToLeft === null) {
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this.enableRightToLeft = false;
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} else {
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this.enableRightToLeft = (savedRightToLeft === 'true');
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}
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})
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.catch(e => {
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const errMsg = `Failed to get the page dimensions. ${e}`;
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console.error(e);
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this.alertClass = 'uk-alert-danger';
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this.msg = errMsg;
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})
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},
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/**
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* Preload an image, which is expected to be cached
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*/
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preloadImage(url) {
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(new Image()).src = url;
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},
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/**
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* Handles the `change` event for the page selector
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*/
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pageChanged() {
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const p = parseInt($('#page-select').val());
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this.toPage(p);
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},
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/**
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* Handles the `change` event for the mode selector
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*
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* @param {function} nextTick - Alpine $nextTick magic property
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*/
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modeChanged(nextTick) {
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const mode = $('#mode-select').val();
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const curIdx = parseInt($('#page-select').val());
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this.updateMode(mode, curIdx, nextTick);
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},
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/**
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* Handles the window `resize` event
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*/
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resized() {
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if (this.mode === 'continuous') return;
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const wideScreen = $(window).width() > $(window).height();
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this.mode = wideScreen ? 'height' : 'width';
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},
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/**
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* Handles the window `keydown` event
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*
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* @param {Event} event - The triggering event
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*/
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keyHandler(event) {
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if (this.mode === 'continuous') return;
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if (event.key === 'ArrowLeft' || event.key === 'k')
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this.flipPage(false ^ this.enableRightToLeft);
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if (event.key === 'ArrowRight' || event.key === 'j')
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this.flipPage(true ^ this.enableRightToLeft);
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},
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/**
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* Flips to the next or the previous page
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*
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* @param {bool} isNext - Whether we are going to the next page
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*/
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flipPage(isNext) {
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const idx = parseInt(this.curItem.id);
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const newIdx = idx + (isNext ? 1 : -1);
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if (newIdx <= 0) return;
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if (newIdx > this.items.length) {
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this.showControl(idx);
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return;
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}
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if (newIdx + this.preloadLookahead < this.items.length + 1) {
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this.preloadImage(this.items[newIdx + this.preloadLookahead - 1].url);
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}
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this.toPage(newIdx);
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if (this.enableFlipAnimation) {
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if (isNext ^ this.enableRightToLeft)
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this.flipAnimation = 'right';
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else
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this.flipAnimation = 'left';
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}
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setTimeout(() => {
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this.flipAnimation = null;
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}, 500);
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this.replaceHistory(newIdx);
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},
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/**
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* Jumps to a specific page
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*
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* @param {number} idx - One-based index of the page
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*/
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toPage(idx) {
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if (this.mode === 'continuous') {
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$(`#${idx}`).get(0).scrollIntoView(true);
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} else {
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if (idx >= 1 && idx <= this.items.length) {
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this.curItem = this.items[idx - 1];
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}
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}
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this.replaceHistory(idx);
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UIkit.modal($('#modal-sections')).hide();
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},
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/**
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* Replace the address bar history and save the reading progress if necessary
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*
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* @param {number} idx - One-based index of the page
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*/
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replaceHistory(idx) {
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const ary = window.location.pathname.split('/');
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ary[ary.length - 1] = idx;
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ary.shift(); // remove leading `/`
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ary.unshift(window.location.origin);
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const url = ary.join('/');
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this.saveProgress(idx);
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history.replaceState(null, "", url);
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},
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/**
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* Updates the backend reading progress if:
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* 1) the current page is more than five pages away from the last
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* saved page, or
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* 2) the average height/width ratio of the pages is over 2, or
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* 3) the current page is the first page, or
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* 4) the current page is the last page
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*
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* @param {number} idx - One-based index of the page
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* @param {function} cb - Callback
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*/
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saveProgress(idx, cb) {
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idx = parseInt(idx);
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if (Math.abs(idx - this.lastSavedPage) >= 5 ||
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this.longPages ||
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idx === 1 || idx === this.items.length
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) {
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this.lastSavedPage = idx;
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console.log('saving progress', idx);
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const url = `${base_url}api/progress/${tid}/${idx}?${$.param({eid: eid})}`;
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$.ajax({
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method: 'PUT',
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url: url,
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dataType: 'json'
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})
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.done(data => {
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if (data.error)
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alert('danger', data.error);
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if (cb) cb();
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})
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.fail((jqXHR, status) => {
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alert('danger', `Error: [${jqXHR.status}] ${jqXHR.statusText}`);
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});
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}
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},
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/**
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* Updates the reader mode
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*
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* @param {string} mode - Either `continuous` or `paged`
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* @param {number} targetPage - The one-based index of the target page
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* @param {function} nextTick - Alpine $nextTick magic property
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*/
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updateMode(mode, targetPage, nextTick) {
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localStorage.setItem('mode', mode);
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// The mode to be put into the `mode` prop. It can't be `screen`
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let propMode = mode;
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if (mode === 'paged') {
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const wideScreen = $(window).width() > $(window).height();
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propMode = wideScreen ? 'height' : 'width';
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}
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this.mode = propMode;
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if (mode === 'continuous') {
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nextTick(() => {
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this.setupScroller();
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});
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}
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nextTick(() => {
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this.toPage(targetPage);
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});
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},
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/**
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* Handles clicked image
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*
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* @param {Event} event - The triggering event
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*/
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clickImage(event) {
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const idx = event.currentTarget.id;
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this.showControl(idx);
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},
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/**
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* Shows the control modal
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*
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* @param {number} idx - selected page index
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*/
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showControl(idx) {
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this.selectedIndex = idx;
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UIkit.modal($('#modal-sections')).show();
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},
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/**
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* Redirects to a URL
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*
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* @param {string} url - The target URL
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*/
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redirect(url) {
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window.location.replace(url);
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},
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/**
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* Set up the scroll handler that calls `replaceHistory` when an image
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* enters the view port
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*/
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setupScroller() {
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if (this.mode !== 'continuous') return;
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$('img').each((idx, el) => {
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$(el).on('inview', (event, inView) => {
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if (inView) {
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const current = $(event.currentTarget).attr('id');
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this.curItem = this.items[current - 1];
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this.replaceHistory(current);
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}
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});
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});
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},
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/**
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* Marks progress as 100% and jumps to the next entry
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*
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* @param {string} nextUrl - URL of the next entry
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*/
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nextEntry(nextUrl) {
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this.saveProgress(this.items.length, () => {
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this.redirect(nextUrl);
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});
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},
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/**
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* Exits the reader, and sets the reading progress tp 100%
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*
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* @param {string} exitUrl - The Exit URL
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*/
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exitReader(exitUrl) {
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this.saveProgress(this.items.length, () => {
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this.redirect(exitUrl);
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});
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},
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/**
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* Handles the `change` event for the entry selector
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*/
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entryChanged() {
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const id = $('#entry-select').val();
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this.redirect(`${base_url}reader/${tid}/${id}`);
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},
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marginChanged() {
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localStorage.setItem('margin', this.margin);
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this.toPage(this.selectedIndex);
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},
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preloadLookaheadChanged() {
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localStorage.setItem('preloadLookahead', this.preloadLookahead);
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},
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enableFlipAnimationChanged() {
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localStorage.setItem('enableFlipAnimation', this.enableFlipAnimation);
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},
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enableRightToLeftChanged() {
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localStorage.setItem('enableRightToLeft', this.enableRightToLeft);
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},
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};
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}
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