restructure the reader

webUI/react/src/components/reader/Page.tsx

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+/* eslint-disable react/no-unused-prop-types */
+/* eslint-disable @typescript-eslint/no-unused-vars */
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import CircularProgress from '@material-ui/core/CircularProgress';
+import { makeStyles } from '@material-ui/core/styles';
+import React, { useEffect, useRef, useState } from 'react';
+import LazyLoad from 'react-lazyload';
+
+const useStyles = (settings: IReaderSettings) => makeStyles({
+    loading: {
+        margin: '100px auto',
+        height: '100vh',
+        width: '100vw',
+    },
+    loadingImage: {
+        height: '100vh',
+        width: '70vw',
+        padding: '50px calc(50% - 20px)',
+        backgroundColor: '#525252',
+        marginBottom: 10,
+    },
+    image: {
+        display: 'block',
+        marginBottom: settings.continuesPageGap ? '15px' : 0,
+    },
+});
+
+interface IProps {
+    src: string
+    index: number
+    setCurPage: React.Dispatch<React.SetStateAction<number>>
+    settings: IReaderSettings
+}
+
+function LazyImage(props: IProps) {
+    const {
+        src, index, setCurPage, settings,
+    } = props;
+
+    const classes = useStyles(settings)();
+    const [imageSrc, setImagsrc] = useState<string>('');
+    const ref = useRef<HTMLImageElement>(null);
+
+    const handleScroll = () => {
+        if (ref.current) {
+            const rect = ref.current.getBoundingClientRect();
+            if (rect.y < 0 && rect.y + rect.height > 0) {
+                setCurPage(index);
+            }
+        }
+    };
+
+    useEffect(() => {
+        window.addEventListener('scroll', handleScroll);
+
+        return () => {
+            window.removeEventListener('scroll', handleScroll);
+        };
+    }, [handleScroll]);
+
+    useEffect(() => {
+        const img = new Image();
+        img.src = src;
+
+        img.onload = () => setImagsrc(src);
+    }, [src]);
+
+    if (imageSrc.length === 0) {
+        return (
+            <div className={`${classes.image} ${classes.loadingImage}`}>
+                <CircularProgress thickness={5} />
+            </div>
+        );
+    }
+
+    return (
+        <img
+            className={classes.image}
+            ref={ref}
+            src={imageSrc}
+            alt={`Page #${index}`}
+            style={{ width: '100%', maxWidth: '95vw' }}
+        />
+    );
+}
+
+export default function Page(props: IProps) {
+    const {
+        src, index, setCurPage, settings,
+    } = props;
+    const classes = useStyles(settings)();
+
+    return (
+        <div style={{ margin: '0 auto' }}>
+            <LazyLoad
+                offset={window.innerHeight}
+                placeholder={(
+                    <div className={classes.loadingImage}>
+                        <CircularProgress thickness={5} />
+                    </div>
+                )}
+                once
+            >
+                <LazyImage
+                    src={src}
+                    index={index}
+                    setCurPage={setCurPage}
+                    settings={settings}
+                />
+            </LazyLoad>
+        </div>
+    );
+}

webUI/react/src/components/reader/PageNumber.tsx

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+import { makeStyles } from '@material-ui/core/styles';
+import React from 'react';
+
+const useStyles = (settings: IReaderSettings) => makeStyles({
+    pageNumber: {
+        display: settings.showPageNumber ? 'block' : 'none',
+        position: 'fixed',
+        bottom: '50px',
+        right: settings.staticNav ? 'calc((100vw - 325px)/2)' : 'calc((100vw - 25px)/2)',
+        width: '50px',
+        textAlign: 'center',
+        backgroundColor: 'rgba(0, 0, 0, 0.3)',
+        borderRadius: '10px',
+    },
+});
+
+interface IProps {
+    settings: IReaderSettings
+    curPage: number
+    pageCount: number
+}
+
+export default function PageNumber(props: IProps) {
+    const { settings, curPage, pageCount } = props;
+    const classes = useStyles(settings)();
+
+    return (
+        <div className={classes.pageNumber}>
+            {`${curPage + 1} / ${pageCount}`}
+        </div>
+    );
+}

webUI/react/src/components/reader/VerticalReader.tsx

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+/* eslint-disable @typescript-eslint/no-unused-vars */
+import { makeStyles } from '@material-ui/core/styles';
+import React from 'react';
+import Page from './Page';
+
+const useStyles = makeStyles({
+    reader: {
+        display: 'flex',
+        flexDirection: 'column',
+        justifyContent: 'center',
+        margin: '0 auto',
+        width: '100%',
+    },
+});
+
+interface IProps {
+    pages: Array<IReaderPage>
+    setCurPage: React.Dispatch<React.SetStateAction<number>>
+    settings: IReaderSettings
+}
+
+export default function VerticalReader(props: IProps) {
+    const { pages, settings, setCurPage } = props;
+
+    const classes = useStyles();
+
+    return (
+        <div className={classes.reader}>
+            {
+                pages.map((page) => (
+                    <Page
+                        key={page.index}
+                        index={page.index}
+                        src={page.src}
+                        setCurPage={setCurPage}
+                        settings={settings}
+                    />
+                ))
+            }
+        </div>
+    );
+}