468 lines
14 KiB
Vue
468 lines
14 KiB
Vue
<template>
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<div ref="main" class="main">
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<canvas ref="canvas" class="canvas" @mousedown.prevent.stop="onMouseDown" @mouseup.prevent.stop="onMouseUp"
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@wheel.prevent.stop="onMouseWheel"
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@touchstart.prevent.stop="onTouchStart" @touchend.prevent.stop="onTouchEnd"
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oncontextmenu="return false;"></canvas>
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</div>
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</template>
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<script>
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//-----------------------------------------------------------------------------
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import Vue from 'vue';
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import Component from 'vue-class-component';
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import _ from 'lodash';
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import {sleep} from '../../../share/utils';
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import bookManager from '../share/bookManager';
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export default @Component({
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watch: {
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bookPos: function(newValue) {
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this.debouncedEmitPosChange(newValue);
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this.drawPage();
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},
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},
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})
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class TextPage extends Vue {
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lastBook = null;
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bookPos = 0;
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//убрать
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meta = null;
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items = null;
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created() {
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this.commit = this.$store.commit;
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this.dispatch = this.$store.dispatch;
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this.config = this.$store.state.config;
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this.reader = this.$store.state.reader;
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this.debouncedEmitPosChange = _.debounce((newValue) => {
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this.$emit('book-pos-changed', {bookPos: newValue});
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}, 1000);
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this.$root.$on('resize', () => {this.$nextTick(this.onResize)});
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}
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mounted() {
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this.canvas = this.$refs.canvas;
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this.context = this.canvas.getContext('2d');
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}
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async calcDrawProps() {
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this.realWidth = this.$refs.main.clientWidth;
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this.realHeight = this.$refs.main.clientHeight;
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let ratio = window.devicePixelRatio;
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if (ratio) {
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this.canvas.width = this.realWidth*ratio;
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this.canvas.height = this.realHeight*ratio;
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this.canvas.style.width = this.$refs.main.clientWidth + 'px';
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this.canvas.style.height = this.$refs.main.clientHeight + 'px';
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this.context.scale(ratio, ratio);
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} else {
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this.canvas.width = this.realWidth;
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this.canvas.height = this.realHeight;
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}
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this.lineHeight = this.fontSize + this.lineInterval;
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this.pageLineCount = Math.floor(this.realHeight/this.lineHeight);
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this.w = this.realWidth - 2*this.indent;
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this.h = this.realHeight;
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this.context.textAlign = 'left';
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this.context.textBaseline = 'bottom';
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if (this.parsed) {
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this.parsed.p = this.p;
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this.parsed.w = this.w;// px, ширина текста
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this.parsed.font = this.font;
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this.parsed.wordWrap = this.wordWrap;
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this.measureText = (text, style) => {// eslint-disable-line no-unused-vars
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if (style)
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this.context.font = this.fontByStyle(style);
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return this.context.measureText(text).width;
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};
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this.parsed.measureText = this.measureText;
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}
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}
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async loadFonts() {
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let loaded = await Promise.all(this.fontList.map(font => document.fonts.check(font)));
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if (loaded.some(r => !r)) {
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loaded = await Promise.all(this.fontList.map(font => document.fonts.load(font)));
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if (loaded.some(r => !r.length))
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throw new Error('some font not loaded');
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}
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}
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showBook() {
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this.$refs.main.focus();
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this.book = null;
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this.meta = null;
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this.fb2 = null;
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this.parsed = null;
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this.linesUp = null;
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this.linesDown = null;
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//preloaded fonts
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this.fontList = ['12px ReaderDefault', '12px Arial', '12px ComicSansMS', '12px OpenSans', '12px Roboto', '12px ArialNarrow',
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'12px Georgia', '12px Tahoma', '12px Helvetica', '12px CenturySchoolbook'];
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//draw props
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this.textColor = 'black';
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this.backgroundColor = '#478355';
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this.fontStyle = '';// 'bold','italic'
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this.fontSize = 34;// px
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this.fontName = 'Arial';
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this.lineInterval = 7;// px, межстрочный интервал
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this.textAlignJustify = true;// выравнивание по ширине
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this.p = 50;// px, отступ параграфа
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this.indent = 15;// px, отступ всего текста слева и справа
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this.wordWrap = true;
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this.statusBar = 'none'; //'none', 'top', 'bottom'
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this.calcDrawProps();
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this.drawPage();// пока не загрузили, очистим канвас
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if (this.lastBook) {
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(async() => {
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const isParsed = await bookManager.hasBookParsed(this.lastBook);
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if (!isParsed) {
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return;
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}
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this.book = await bookManager.getBook(this.lastBook);
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this.meta = bookManager.metaOnly(this.book);
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this.fb2 = this.meta.fb2;
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this.$root.$emit('set-app-title', _.compact([
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this.fb2.lastName,
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this.fb2.middleName,
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this.fb2.firstName,
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'-',
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this.fb2.bookTitle
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]).join(' '));
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const parsed = this.book.parsed;
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this.parsed = parsed;
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this.calcDrawProps();
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await this.loadFonts();
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this.drawPage();
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})();
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}
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}
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onResize() {
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this.calcDrawProps();
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this.drawPage();
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}
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get font() {
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return `${this.fontStyle} ${this.fontSize}px ${this.fontName}`;
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}
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fontByStyle(style) {
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return `${style.italic ? 'italic' : ''} ${style.bold ? 'bold' : ''} ${this.fontSize}px ${this.fontName}`;
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}
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drawPage() {
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if (!this.lastBook)
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return;
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//пустой канвас
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const canvas = this.canvas;
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const context = this.context;
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context.fillStyle = this.backgroundColor;
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context.fillRect(0, 0, canvas.width, canvas.height);
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if (!this.book)
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return;
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context.font = this.font;
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context.fillStyle = this.textColor;
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const spaceWidth = this.context.measureText(' ').width;
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const lines = this.parsed.getLines(this.bookPos, this.pageLineCount + 1);
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let len = lines.length;
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len = (len > this.pageLineCount ? len = this.pageLineCount : len);
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let y = -this.lineInterval/2 + (this.h - this.pageLineCount*this.lineHeight)/2;
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for (let i = 0; i < len; i++) {
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const line = lines[i];
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/* line:
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{
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begin: Number,
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end: Number,
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first: Boolean,
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last: Boolean,
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parts: array of {
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style: {bold: Boolean, italic: Boolean}
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text: String,
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}
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}*/
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let indent = this.indent + (line.first ? this.p : 0);
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y += this.lineHeight;
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let filled = false;
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if (this.textAlignJustify && !line.last) {
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let lineText = '';
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for (const part of line.parts) {
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lineText += part.text;
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}
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const words = lineText.split(' ');
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if (words.length > 1) {
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const spaceCount = words.length - 1;
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const space = (this.w - line.width + spaceWidth*spaceCount)/spaceCount;
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let x = indent;
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for (const part of line.parts) {
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context.font = this.fontByStyle(part.style);
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let partWords = part.text.split(' ');
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for (let i = 0; i < partWords.length; i++) {
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let word = partWords[i];
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context.fillText(word, x, y);
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x += this.measureText(word, part.style) + (i < partWords.length - 1 ? space : 0);
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}
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}
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filled = true;
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}
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}
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if (!filled) {
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let x = indent;
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for (const part of line.parts) {
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let text = part.text;
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context.font = this.fontByStyle(part.style);
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context.fillText(text, x, y);
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x += this.measureText(text, part.style);
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}
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}
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}
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this.linesUp = this.parsed.getLines(this.bookPos, -(this.pageLineCount + 1));
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this.linesDown = lines;
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}
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doDown() {
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if (this.linesDown && this.linesDown.length > 1) {
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this.bookPos = this.linesDown[1].begin;
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}
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}
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doUp() {
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if (this.linesUp && this.linesUp.length > 1) {
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this.bookPos = this.linesUp[1].begin;
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}
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}
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doPageDown() {
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if (this.linesDown) {
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let i = this.pageLineCount;
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i--;
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if (i >= 0 && this.linesDown.length > i) {
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this.bookPos = this.linesDown[i].begin;
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}
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}
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}
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doPageUp() {
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if (this.linesUp) {
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let i = this.pageLineCount;
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i--;
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i = (i > this.linesUp.length - 1 ? this.linesUp.length - 1 : i);
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if (i >= 0 && this.linesUp.length > i) {
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this.bookPos = this.linesUp[i].begin;
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}
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}
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}
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doHome() {
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this.bookPos = 0;
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}
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doEnd() {
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if (this.parsed.para.length) {
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const lastPara = this.parsed.para[this.parsed.para.length - 1];
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this.bookPos = lastPara.offset + lastPara.length - 1;
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}
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}
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doToolBarToggle() {
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this.$emit('tool-bar-toggle');
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}
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keyHook(event) {
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if (event.type == 'keydown') {
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switch (event.code) {
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case 'ArrowDown':
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this.doDown();
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break;
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case 'ArrowUp':
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this.doUp();
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break;
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case 'PageDown':
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case 'ArrowRight':
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case 'Enter':
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case 'Space':
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this.doPageDown();
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break;
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case 'PageUp':
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case 'ArrowLeft':
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case 'Backspace':
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this.doPageUp();
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break;
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case 'Home':
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this.doHome();
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break;
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case 'End':
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this.doEnd();
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break;
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}
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}
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}
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async startClickRepeat(pointX, pointY) {
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if (!this.repInit) {
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this.repInit = true;
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this.repStart = true;
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await sleep(1000);
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if (this.debouncedRepStart) {
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this.debouncedRepStart = false;
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this.repInit = false;
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await this.startClickRepeat(pointX, pointY);
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}
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if (this.repStart) {
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this.repDoing = true;
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let delay = 500;
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while (this.repDoing) {
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this.handleClick(pointX, pointY);
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await sleep(delay);
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if (delay > 20)
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delay *= 0.7;
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}
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}
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this.repInit = false;
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} else {
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this.debouncedRepStart = true;
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}
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}
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endClickRepeat() {
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this.repStart = false;
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this.repDoing = false;
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this.debouncedRepStart = false;
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}
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onTouchStart(event) {
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this.endClickRepeat();
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if (event.touches.length == 1) {
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const touch = event.touches[0];
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this.handleClick(touch.clientX, touch.clientY);
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this.startClickRepeat(touch.clientX, touch.clientY);
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}
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}
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onTouchEnd() {
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this.endClickRepeat();
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}
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onMouseDown(event) {
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this.endClickRepeat();
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if (event.button == 0) {
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this.handleClick(event.clientX, event.clientY);
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this.startClickRepeat(event.clientX, event.clientY);
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} else if (event.button == 2) {
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this.doToolBarToggle();
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}
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}
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onMouseUp() {
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this.endClickRepeat();
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}
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onMouseWheel(event) {
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if (event.deltaY > 0) {
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this.doDown();
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} else if (event.deltaY < 0) {
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this.doUp();
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}
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}
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handleClick(pointX, pointY) {
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const mouseLegend = {
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40: {30: 'PgUp', 100: 'PgDown'},
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60: {40: 'Up', 60: 'Menu', 100: 'Down'},
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100: {30: 'PgUp', 100: 'PgDown'}
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};
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const w = pointX/this.realWidth*100;
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const h = pointY/this.realHeight*100;
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let action = '';
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loops: {
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for (const x in mouseLegend) {
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for (const y in mouseLegend[x]) {
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if (w < x && h < y) {
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action = mouseLegend[x][y];
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break loops;
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}
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}
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}
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}
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switch (action) {
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case 'Down' ://Down
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this.doDown();
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break;
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case 'Up' ://Up
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this.doUp();
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break;
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case 'PgDown' ://PgDown
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this.doPageDown();
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break;
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case 'PgUp' ://PgUp
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this.doPageUp();
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break;
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case 'Menu' :
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this.doToolBarToggle();
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break;
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default :
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// Nothing
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}
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return !!action;
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}
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}
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//-----------------------------------------------------------------------------
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</script>
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<style scoped>
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.main {
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flex: 1;
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margin: 0;
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padding: 0;
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overflow: hidden;
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}
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.canvas {
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margin: 0;
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padding: 0;
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}
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</style>
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