Improve continuous horizontal reader (#110)

* differentiate ContinuesHorizontalLTR and ContinuesHorizontalRTL

* fix displaying pages in horizontal viewer

* add scroll handler for horizontal mode

* update curPage when images pass through center of the screen

* add click events to navigate pages

* remove console.log

* fix click mapping for ContinuesHorizontalRTL

* remove disable eslint inline comment

* fix ContinuesHorizontalRTL not updating curPage on scroll

* add ability to click to drag

* add margin in between images

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

@@ -11,15 +11,20 @@ import React, { useEffect, useRef } from 'react';
 import SpinnerImage from 'components/SpinnerImage';
 
 function imageStyle(settings: IReaderSettings): CSSProperties {
-    if (settings.readerType === 'DoubleLTR' || settings.readerType === 'DoubleRTL' || settings.readerType === 'ContinuesHorizontal') {
+    if (settings.readerType === 'DoubleLTR'
+    || settings.readerType === 'DoubleRTL'
+    || settings.readerType === 'ContinuesHorizontalLTR'
+    || settings.readerType === 'ContinuesHorizontalRTL') {
         return {
             display: 'block',
-            marginBottom: 0,
+            marginLeft: '7px',
+            marginRight: '7px',
             width: 'auto',
             minHeight: '99vh',
             height: 'auto',
             maxHeight: '99vh',
             objectFit: 'contain',
+            pointerEvents: 'none',
         };
     }
 
@@ -64,7 +69,7 @@ const Page = React.forwardRef((props: IProps, ref: any) => {
     const classes = useStyles(settings)();
     const imgRef = useRef<HTMLImageElement>(null);
 
-    const handleScroll = () => {
+    const handleVerticalScroll = () => {
         if (imgRef.current) {
             const rect = imgRef.current.getBoundingClientRect();
             if (rect.y < 0 && rect.y + rect.height > 0) {
@@ -73,15 +78,29 @@ const Page = React.forwardRef((props: IProps, ref: any) => {
         }
     };
 
-    useEffect(() => {
-        if (settings.readerType === 'Webtoon' || settings.readerType === 'ContinuesVertical') {
-            window.addEventListener('scroll', handleScroll);
+    const handleHorizontalScroll = () => {
+        if (imgRef.current) {
+            const rect = imgRef.current.getBoundingClientRect();
+            if (rect.left <= window.innerWidth / 2 && rect.right > window.innerWidth / 2) {
+                setCurPage(index);
+            }
+        }
+    };
 
-            return () => {
-                window.removeEventListener('scroll', handleScroll);
-            };
-        } return () => {};
-    }, [handleScroll]);
+    useEffect(() => {
+        switch (settings.readerType) {
+            case 'Webtoon':
+            case 'ContinuesVertical':
+                window.addEventListener('scroll', handleVerticalScroll);
+                return () => window.removeEventListener('scroll', handleVerticalScroll);
+            case 'ContinuesHorizontalLTR':
+            case 'ContinuesHorizontalRTL':
+                window.addEventListener('scroll', handleHorizontalScroll);
+                return () => window.removeEventListener('scroll', handleHorizontalScroll);
+            default:
+                return () => {};
+        }
+    }, [handleVerticalScroll]);
 
     return (
         <div ref={ref} style={{ margin: '0 auto' }}>

webUI/react/src/components/manga/reader/pager/HorizontalPager.tsx

@@ -6,34 +6,129 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 import { makeStyles } from '@material-ui/core/styles';
-import React from 'react';
+import React, { useEffect, useRef } from 'react';
 import Page from '../Page';
 
-const useStyles = makeStyles({
+const useStyles = (settings: IReaderSettings) => makeStyles({
     reader: {
         display: 'flex',
-        flexDirection: 'row',
-        justifyContent: 'center',
+        flexDirection: (settings.readerType === 'ContinuesHorizontalLTR') ? 'row' : 'row-reverse',
+        justifyContent: (settings.readerType === 'ContinuesHorizontalLTR') ? 'flex-start' : 'flex-end',
         margin: '0 auto',
-        width: '100%',
-        height: '100vh',
-        overflowX: 'scroll',
+        width: 'auto',
+        height: 'auto',
+        overflowX: 'visible',
+        userSelect: 'none',
     },
 });
 
-interface IProps {
-    pages: Array<IReaderPage>
-    setCurPage: React.Dispatch<React.SetStateAction<number>>
-    settings: IReaderSettings
-}
+export default function HorizontalPager(props: IReaderProps) {
+    const {
+        pages, curPage, settings, setCurPage, prevChapter, nextChapter,
+    } = props;
 
-export default function HorizontalPager(props: IProps) {
-    const { pages, settings, setCurPage } = props;
+    const classes = useStyles(settings)();
 
-    const classes = useStyles();
+    const selfRef = useRef<HTMLDivElement>(null);
+    const pagesRef = useRef<HTMLDivElement[]>([]);
+
+    function nextPage() {
+        if (curPage < pages.length - 1) {
+            pagesRef.current[curPage + 1]?.scrollIntoView({ inline: 'center' });
+            setCurPage((page) => page + 1);
+        } else if (settings.loadNextonEnding) {
+            nextChapter();
+        }
+    }
+
+    function prevPage() {
+        if (curPage > 0) {
+            pagesRef.current[curPage - 1]?.scrollIntoView({ inline: 'center' });
+            setCurPage(curPage - 1);
+        } else if (curPage === 0) {
+            prevChapter();
+        }
+    }
+
+    function goLeft() {
+        if (settings.readerType === 'ContinuesHorizontalLTR') {
+            prevPage();
+        } else {
+            nextPage();
+        }
+    }
+
+    function goRight() {
+        if (settings.readerType === 'ContinuesHorizontalLTR') {
+            nextPage();
+        } else {
+            prevPage();
+        }
+    }
+
+    const mouseXPos = useRef<number>(0);
+
+    function dragScreen(e: MouseEvent) {
+        window.scrollBy(mouseXPos.current - e.pageX, 0);
+    }
+
+    function dragControl(e:MouseEvent) {
+        mouseXPos.current = e.pageX;
+        selfRef.current?.addEventListener('mousemove', dragScreen);
+    }
+
+    function removeDragControl() {
+        selfRef.current?.removeEventListener('mousemove', dragScreen);
+    }
+
+    function clickControl(e:MouseEvent) {
+        if (e.clientX >= window.innerWidth * 0.85) {
+            goRight();
+        } else if (e.clientX <= window.innerWidth * 0.15) {
+            goLeft();
+        }
+    }
+
+    const handleLoadNextonEnding = () => {
+        if (settings.readerType === 'ContinuesHorizontalLTR') {
+            if (window.scrollX + window.innerWidth >= document.body.scrollWidth) {
+                nextChapter();
+            }
+        } else if (settings.readerType === 'ContinuesHorizontalRTL') {
+            if (window.scrollX <= window.innerWidth) {
+                nextChapter();
+            }
+        }
+    };
+
+    useEffect(() => {
+        pagesRef.current[curPage]?.scrollIntoView({ inline: 'center' });
+    }, [settings.readerType]);
+
+    useEffect(() => {
+        selfRef.current?.addEventListener('mousedown', dragControl);
+        selfRef.current?.addEventListener('mouseup', removeDragControl);
+
+        return () => {
+            selfRef.current?.removeEventListener('mousedown', dragControl);
+            selfRef.current?.removeEventListener('mouseup', removeDragControl);
+        };
+    }, [selfRef]);
+
+    useEffect(() => {
+        if (settings.loadNextonEnding) {
+            document.addEventListener('scroll', handleLoadNextonEnding);
+        }
+        selfRef.current?.addEventListener('mousedown', clickControl);
+
+        return () => {
+            document.removeEventListener('scroll', handleLoadNextonEnding);
+            selfRef.current?.removeEventListener('mousedown', clickControl);
+        };
+    }, [selfRef, curPage]);
 
     return (
-        <div className={classes.reader}>
+        <div ref={selfRef} className={classes.reader}>
             {
                 pages.map((page) => (
                     <Page
@@ -43,6 +138,7 @@ export default function HorizontalPager(props: IProps) {
                         onImageLoad={() => {}}
                         setCurPage={setCurPage}
                         settings={settings}
+                        ref={(e:HTMLDivElement) => { pagesRef.current[page.index] = e; }}
                     />
                 ))
             }

webUI/react/src/components/navbar/ReaderNavBar.tsx

@@ -313,8 +313,12 @@ export default function ReaderNavBar(props: IProps) {
                                         Continues Vertical
 
                                     </MenuItem>
-                                    <MenuItem value="ContinuesHorizontal">
-                                        Horizontal(WIP)
+                                    <MenuItem value="ContinuesHorizontalLTR">
+                                        Horizontal (LTR)
+
+                                    </MenuItem>
+                                    <MenuItem value="ContinuesHorizontalRTL">
+                                        Horizontal (RTL)
 
                                     </MenuItem>
                                 </Select>

webUI/react/src/screens/manga/Reader.tsx

@@ -46,7 +46,8 @@ const getReaderComponent = (readerType: ReaderType) => {
         case 'DoubleLTR':
             return DoublePagedPager;
             break;
-        case 'ContinuesHorizontal':
+        case 'ContinuesHorizontalLTR':
+        case 'ContinuesHorizontalRTL':
             return HorizontalPager;
         default:
             return VerticalPager;

webUI/react/src/typings.d.ts

@@ -117,7 +117,8 @@ type ReaderType =
 'DoubleVertical' |
 'DoubleRTL' |
 'DoubleLTR' |
-'ContinuesHorizontal';
+'ContinuesHorizontalLTR'|
+'ContinuesHorizontalRTL';
 
 interface IReaderSettings{
     staticNav: boolean