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suwayomi-material-you-webui/src/modules/reader/services/ReaderControls.ts

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/*
* 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 { MutableRefObject, RefObject, useCallback, useEffect, useMemo } from 'react';
import { Direction, useTheme } from '@mui/material/styles';
import { useTranslation } from 'react-i18next';
import { TFunction } from 'i18next';
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import { userReaderStatePagesContext } from '@/modules/reader/contexts/state/ReaderStatePagesContext.tsx';
import {
getNextIndexFromPage,
getNextPageIndex,
getPage,
getPageForMousePos,
getProgressBarPositionInfo,
} from '@/modules/reader/utils/ReaderProgressBar.utils.tsx';
import { getOptionForDirection } from '@/modules/theme/services/ThemeCreator.ts';
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import { ReaderService } from '@/modules/reader/services/ReaderService.ts';
import { useReaderStateChaptersContext } from '@/modules/reader/contexts/state/ReaderStateChaptersContext.tsx';
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import {
PageInViewportType,
ProgressBarPosition,
ReaderTransitionPageMode,
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ReadingDirection,
ReadingMode,
} from '@/modules/reader/types/Reader.types.ts';
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import { ScrollDirection, ScrollOffset } from '@/modules/core/Core.types.ts';
import {
ReaderScrollAmount,
READING_DIRECTION_TO_THEME_DIRECTION,
} from '@/modules/reader/constants/ReaderSettings.constants.tsx';
import {
isATransitionPageVisible,
isEndOfPageInViewport,
isPageInViewport,
} from '@/modules/reader/utils/ReaderPager.utils.tsx';
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import { useReaderOverlayContext } from '@/modules/reader/contexts/ReaderOverlayContext.tsx';
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import { useReaderTapZoneContext } from '@/modules/reader/contexts/ReaderTapZoneContext.tsx';
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import { TapZoneRegionType, TReaderTapZoneContext } from '@/modules/reader/types/TapZoneLayout.types.ts';
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import { ReaderTapZoneService } from '@/modules/reader/services/ReaderTapZoneService.ts';
import { isContinuousReadingMode } from '@/modules/reader/utils/ReaderSettings.utils.tsx';
import {
getReaderChapterFromCache,
getReaderOpenChapterResumeMode,
updateReaderStateVisibleChapters,
} from '@/modules/reader/utils/Reader.utils.ts';
import { ChapterIdInfo, Chapters } from '@/modules/chapter/services/Chapters.ts';
import { DirectionOffset, TranslationKey } from '@/Base.types.ts';
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import { useMetadataServerSettings } from '@/modules/settings/services/ServerSettingsMetadata.ts';
import { TChapterReader } from '@/modules/chapter/Chapter.types.ts';
import { awaitConfirmation } from '@/modules/core/utils/AwaitableDialog.tsx';
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import { defaultPromiseErrorHandler } from '@/lib/DefaultPromiseErrorHandler.ts';
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import { TReaderOverlayContext } from '@/modules/reader/types/ReaderOverlay.types.ts';
import { ReaderProgressBarProps, TReaderProgressCurrentPage } from '@/modules/reader/types/ReaderProgressBar.types.ts';
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const getScrollDirectionInvert = (
scrollDirection: ScrollDirection,
scrollOffset: ScrollOffset,
themeDirection: Direction,
): 1 | -1 => {
if (scrollDirection === ScrollDirection.X) {
if (scrollOffset === ScrollOffset.BACKWARD) {
if (themeDirection === 'ltr') {
return -1;
}
return 1;
}
if (scrollOffset === ScrollOffset.FORWARD) {
if (themeDirection === 'ltr') {
return 1;
}
return -1;
}
}
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// handle ScrollDirection.XY the same as ScrollDirection.Y
if (scrollOffset === ScrollOffset.BACKWARD) {
return -1;
}
return 1;
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};
export class ReaderControls {
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private static updateCurrentPageTimeout: NodeJS.Timeout;
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static scroll(
offset: ScrollOffset,
direction: ScrollDirection,
readingMode: ReadingMode,
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readingDirection: ReadingDirection,
themeDirection: Direction,
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element: HTMLElement,
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openChapter: ReturnType<(typeof ReaderControls)['useOpenChapter']>,
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setIsOverlayVisible: TReaderOverlayContext['setIsVisible'],
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setShowPreview: TReaderTapZoneContext['setShowPreview'],
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scrollAmountPercentage: number = ReaderScrollAmount.LARGE,
): void {
if (!element) {
return;
}
const themeDirectionOfReadingDirection = READING_DIRECTION_TO_THEME_DIRECTION[readingDirection];
const areReadingDirectionsEqual = themeDirection === themeDirectionOfReadingDirection;
const isContinuousReadingModeActive = isContinuousReadingMode(readingMode);
const isAtStartY = Math.abs(element.scrollTop) <= 1;
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const isAtEndY =
Math.floor(element.scrollTop) === element.scrollHeight - element.clientHeight ||
Math.ceil(element.scrollTop) === element.scrollHeight - element.clientHeight;
const isAtStartX = Math.abs(element.scrollLeft) <= 1;
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const isAtEndX =
element.scrollWidth - element.clientWidth - Math.floor(Math.abs(element.scrollLeft)) <= 1 ||
element.scrollWidth - element.clientWidth - Math.ceil(Math.abs(element.scrollLeft)) <= 1;
const isAtStartXForDirection = areReadingDirectionsEqual ? isAtStartX : isAtEndX;
const isAtEndXForDirection = areReadingDirectionsEqual ? isAtEndX : isAtStartX;
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const scrollAmount = scrollAmountPercentage / 100;
const scrollDirection = getScrollDirectionInvert(direction, offset, themeDirectionOfReadingDirection);
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const getNewScrollPosition = (currentPos: number, elementSize: number) =>
currentPos + elementSize * scrollAmount * scrollDirection;
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setIsOverlayVisible(false);
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setShowPreview(false);
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switch (direction) {
case ScrollDirection.X:
if (isAtStartXForDirection && offset === ScrollOffset.BACKWARD && isContinuousReadingModeActive) {
openChapter('previous');
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return;
}
if (isAtEndXForDirection && offset === ScrollOffset.FORWARD && isContinuousReadingModeActive) {
openChapter('next');
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return;
}
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element.scroll({
left: getNewScrollPosition(element.scrollLeft, element.clientWidth),
behavior: 'smooth',
});
break;
case ScrollDirection.Y:
if (isAtStartY && offset === ScrollOffset.BACKWARD && isContinuousReadingModeActive) {
openChapter('previous');
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return;
}
if (isAtEndY && offset === ScrollOffset.FORWARD && isContinuousReadingModeActive) {
openChapter('next');
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return;
}
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element.scroll({
top: getNewScrollPosition(element.scrollTop, element.clientHeight),
behavior: 'smooth',
});
break;
default:
throw new Error(`Unexpected "ScrollDirection" (${direction})`);
}
}
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static useOpenChapter(): (
offset: 'previous' | 'next' | ChapterIdInfo['id'],
doTransitionCheck?: boolean,
scrollIntoView?: boolean,
) => void {
const { t } = useTranslation();
const { readingMode, shouldInformAboutMissingChapter, shouldInformAboutScanlatorChange } =
ReaderService.useSettings();
const { currentChapter, previousChapter, nextChapter, chapters, setReaderStateChapters } =
useReaderStateChaptersContext();
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const openChapter = ReaderService.useNavigateToChapter();
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return useCallback(
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(offset, doTransitionCheck = true, scrollIntoView = true) => {
if (!currentChapter) {
return;
}
const isSpecificChapterMode = typeof offset === 'number';
const isPreviousOffset = offset === 'previous';
const doesPreviousChapterExist = isPreviousOffset && !!previousChapter;
const doesNextChapterExist = !isPreviousOffset && !!nextChapter;
const canOpenNextChapter = isSpecificChapterMode || doesPreviousChapterExist || doesNextChapterExist;
if (!canOpenNextChapter) {
return;
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}
const doOpenChapter = async () => {
const chapterToOpen = (() => {
if (isSpecificChapterMode) {
return chapters.find((chapter) => chapter.id === offset);
}
if (isPreviousOffset) {
return previousChapter;
}
return nextChapter;
})();
if (!chapterToOpen) {
return;
}
const isPreviousChapter = chapterToOpen.sourceOrder < currentChapter.sourceOrder;
try {
if (doTransitionCheck) {
await ReaderControls.checkNextChapterConsistency(
t,
isPreviousChapter ? 'previous' : 'next',
currentChapter,
chapterToOpen,
shouldInformAboutMissingChapter,
shouldInformAboutScanlatorChange,
);
}
setReaderStateChapters((prevState) =>
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updateReaderStateVisibleChapters(
isPreviousChapter,
prevState,
chapterToOpen.sourceOrder,
scrollIntoView,
isPreviousChapter ? false : undefined,
!isPreviousChapter ? false : undefined,
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),
);
openChapter(
chapterToOpen,
getReaderOpenChapterResumeMode(isSpecificChapterMode, isPreviousChapter),
);
} catch (error) {
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defaultPromiseErrorHandler('ReaderControls#useOpenChapter#doOpenChapter:')(error);
}
};
doOpenChapter().catch(defaultPromiseErrorHandler('ReaderControls#useOpenChapter'));
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},
[
t,
currentChapter?.id,
openChapter,
readingMode.value,
shouldInformAboutMissingChapter,
shouldInformAboutScanlatorChange,
],
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);
}
private static async checkNextChapterConsistency(
t: TFunction,
offset: 'previous' | 'next',
currentChapter: TChapterReader | null | undefined,
chapterToOpen: TChapterReader | null | undefined,
shouldInformAboutMissingChapter: boolean,
shouldInformAboutScanlatorChange: boolean,
): Promise<void> {
if (!currentChapter || !chapterToOpen) {
return;
}
const missingChapters = Math.max(
0,
Math.trunc(currentChapter.chapterNumber) - Math.trunc(chapterToOpen.chapterNumber) - 1,
);
const isSameScanlator =
!shouldInformAboutScanlatorChange || currentChapter.scanlator === chapterToOpen.scanlator;
const isContinuousChapter = !shouldInformAboutMissingChapter || !missingChapters;
const showWarning = !isSameScanlator || !isContinuousChapter;
if (!showWarning) {
return;
}
const offsetToTranslationKeys: Record<typeof offset, Record<'scanlator' | 'chapter_number', TranslationKey>> = {
previous: {
scanlator: 'reader.chapter_transition.warning.previous.scanlator',
chapter_number: 'reader.chapter_transition.warning.previous.chapter_number',
},
next: {
scanlator: 'reader.chapter_transition.warning.next.scanlator',
chapter_number: 'reader.chapter_transition.warning.next.chapter_number',
},
};
const sameScanlator = isSameScanlator
? ''
: t(offsetToTranslationKeys[offset].scanlator, {
nextScanlator: chapterToOpen.scanlator,
currentScanlator: currentChapter.scanlator,
});
const continuousChapter = isContinuousChapter
? ''
: t(offsetToTranslationKeys[offset].chapter_number, {
count: missingChapters,
nextChapter: `#${chapterToOpen.chapterNumber} ${chapterToOpen.name}`,
currentChapter: `#${currentChapter.chapterNumber} ${currentChapter.name}`,
});
const warningLineBreak = !isSameScanlator && !isContinuousChapter ? '\n\n' : '';
const warning = `${sameScanlator}${warningLineBreak}${continuousChapter}`;
await awaitConfirmation({
title: t('reader.chapter_transition.warning.title'),
message: warning,
actions: {
confirm: {
title: t('global.button.open'),
},
},
});
}
static useOpenPage(): (
page: number | 'previous' | 'next',
forceDirection?: Direction,
hideOverlay?: boolean,
) => void {
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const { currentPageIndex, setPageToScrollToIndex, pages, transitionPageMode, setTransitionPageMode } =
userReaderStatePagesContext();
const { previousChapter, nextChapter } = useReaderStateChaptersContext();
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const { setIsVisible: setIsOverlayVisible } = useReaderOverlayContext();
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const { setShowPreview } = useReaderTapZoneContext();
const { readingDirection, readingMode } = ReaderService.useSettings();
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const openChapter = ReaderControls.useOpenChapter();
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const currentPage = useMemo(() => getPage(currentPageIndex, pages), [currentPageIndex, pages]);
const previousPageIndex = useMemo(
() => getNextPageIndex('previous', currentPage.pagesIndex, pages),
[currentPage, pages],
);
const nextPageIndex = useMemo(
() => getNextPageIndex('next', currentPage.pagesIndex, pages),
[currentPage, pages],
);
const indexOfFirstPage = getNextIndexFromPage(pages[0]);
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const indexOfLastPage = getNextIndexFromPage(pages[pages.length - 1]);
const direction = READING_DIRECTION_TO_THEME_DIRECTION[readingDirection.value];
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const isFirstPage = currentPage.primary.index === 0;
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const isLastPage = currentPageIndex === indexOfLastPage;
const isATransitionPageVisibleFlag = isATransitionPageVisible(transitionPageMode, readingMode.value);
const isContinuousReadingModeActive = isContinuousReadingMode(readingMode.value);
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return useCallback(
(page, forceDirection = direction, hideOverlay: boolean = true) => {
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const convertedPage = getOptionForDirection(
page,
page === 'previous' ? 'next' : 'previous',
forceDirection,
);
if (hideOverlay) {
setIsOverlayVisible(false);
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setShowPreview(false);
}
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const hideTransitionPage = () => setTransitionPageMode(ReaderTransitionPageMode.NONE);
if (typeof page === 'number') {
setPageToScrollToIndex(page);
hideTransitionPage();
return;
}
const areContinuousPagerTransitionPagesVisible =
isContinuousReadingModeActive && isATransitionPageVisibleFlag;
const isPreviousTransitionPageVisible =
(!isContinuousReadingModeActive && transitionPageMode === ReaderTransitionPageMode.PREVIOUS) ||
areContinuousPagerTransitionPagesVisible;
const isNextTransitionPageVisible =
(!isContinuousReadingModeActive && transitionPageMode === ReaderTransitionPageMode.NEXT) ||
areContinuousPagerTransitionPagesVisible;
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const shouldOpenPreviousChapter =
isFirstPage && isPreviousTransitionPageVisible && convertedPage === 'previous' && !!previousChapter;
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if (shouldOpenPreviousChapter) {
openChapter('previous');
return;
}
const shouldOpenNextChapter =
isLastPage && isNextTransitionPageVisible && convertedPage === 'next' && !!nextChapter;
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if (shouldOpenNextChapter) {
openChapter('next');
return;
}
const isPreviousMode = convertedPage === 'previous';
const isNextMode = convertedPage === 'next';
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const closePreviousTransitionPage = isPreviousTransitionPageVisible && isNextMode;
const closeNextTransitionPage = isNextTransitionPageVisible && isPreviousMode;
const needToHideTransitionPage =
isATransitionPageVisibleFlag &&
!isContinuousReadingModeActive &&
(closePreviousTransitionPage || closeNextTransitionPage);
if (needToHideTransitionPage) {
hideTransitionPage();
setPageToScrollToIndex(isPreviousTransitionPageVisible ? indexOfFirstPage : indexOfLastPage);
return;
}
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const needToOpenTransitionPage =
((isFirstPage && isPreviousMode) || (isLastPage && isNextMode)) && !isContinuousReadingModeActive;
if (needToOpenTransitionPage) {
setTransitionPageMode(
isPreviousMode ? ReaderTransitionPageMode.PREVIOUS : ReaderTransitionPageMode.NEXT,
);
return;
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}
setPageToScrollToIndex(isPreviousMode ? previousPageIndex : nextPageIndex);
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},
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[
direction,
indexOfFirstPage,
indexOfLastPage,
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previousPageIndex,
nextPageIndex,
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indexOfLastPage,
isATransitionPageVisibleFlag,
isContinuousReadingModeActive,
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isFirstPage,
isLastPage,
openChapter,
!!previousChapter,
!!nextChapter,
],
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);
}
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static useUpdateCurrentPageIndex(): (
pageIndex: number,
debounceChapterUpdate?: boolean,
endReached?: boolean,
) => void {
const { currentPageIndex, setCurrentPageIndex } = userReaderStatePagesContext();
const {
chapterForDuplicatesHandling,
currentChapter,
previousChapter,
nextChapter,
mangaChapters,
visibleChapters,
setReaderStateChapters,
} = useReaderStateChaptersContext();
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const updateChapter = ReaderService.useUpdateChapter();
const { shouldSkipDupChapters } = ReaderService.useSettings();
const {
settings: { downloadAheadLimit },
} = useMetadataServerSettings();
const nextChapters = useMemo(() => {
if (!chapterForDuplicatesHandling || !currentChapter) {
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return [];
}
return Chapters.getNextChapters(currentChapter, mangaChapters, {
offset: DirectionOffset.NEXT,
skipDupe: shouldSkipDupChapters,
skipDupeChapter: chapterForDuplicatesHandling,
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});
}, [chapterForDuplicatesHandling?.id, currentChapter?.id, mangaChapters, shouldSkipDupChapters]);
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return useCallback(
(pageIndex, debounceChapterUpdate = true, endReached = false) => {
if (pageIndex === currentPageIndex && !endReached) {
return;
}
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setCurrentPageIndex(pageIndex);
if (!currentChapter) {
return;
}
const direction = currentPageIndex > pageIndex ? DirectionOffset.PREVIOUS : DirectionOffset.NEXT;
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ReaderService.downloadAhead(currentChapter, nextChapter, nextChapters, pageIndex, downloadAheadLimit);
ReaderService.preloadChapter(
pageIndex,
currentChapter.pageCount,
direction === DirectionOffset.NEXT ? nextChapter : previousChapter,
visibleChapters.lastLeadingChapterSourceOrder,
visibleChapters.lastTrailingChapterSourceOrder,
setReaderStateChapters,
direction,
);
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const handleCurrentPageIndexChange = () => {
const currentChapterUpToDate = getReaderChapterFromCache(currentChapter.id);
if (!currentChapterUpToDate) {
return;
}
const actualPageIndex = endReached ? currentChapterUpToDate.pageCount - 1 : pageIndex;
const isLastPage = actualPageIndex === currentChapterUpToDate.pageCount - 1;
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updateChapter({
lastPageRead: actualPageIndex,
isRead: isLastPage ? true : undefined,
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});
};
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clearTimeout(ReaderControls.updateCurrentPageTimeout);
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if (debounceChapterUpdate) {
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ReaderControls.updateCurrentPageTimeout = setTimeout(handleCurrentPageIndexChange, 1000);
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return;
}
handleCurrentPageIndexChange();
},
[
currentChapter?.id,
previousChapter?.id,
nextChapter?.id,
nextChapters,
currentPageIndex,
downloadAheadLimit,
visibleChapters,
],
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);
}
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static updateCurrentPageOnScroll(
imageRefs: MutableRefObject<(HTMLElement | null)[]>,
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lastPageIndex: number,
updateCurrentPageIndex: ReturnType<typeof ReaderControls.useUpdateCurrentPageIndex>,
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type: PageInViewportType,
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readingDirection: ReadingDirection,
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) {
const themeDirectionForReadingDirection = READING_DIRECTION_TO_THEME_DIRECTION[readingDirection];
const firstVisibleImageIndex = imageRefs.current.findIndex(
(image) =>
image &&
isPageInViewport(
image,
type,
// the pages aren't always properly scrolled to the top which results in the leading page to still be slightly
// visible (e.g. 0.0123px) breaking the "first visible image" detection
{
bottom: 1,
left: getOptionForDirection(0, window.innerWidth + 1, themeDirectionForReadingDirection),
right: getOptionForDirection(1, 0, themeDirectionForReadingDirection),
},
),
);
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const lastPage = imageRefs.current?.[imageRefs.current.length - 1];
const isEndReached = lastPage && isEndOfPageInViewport(lastPage, type, readingDirection);
if (firstVisibleImageIndex === -1) {
return;
}
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// handle cases where the last page is too small to ever be the "firstVisibleImageIndex"
if (isEndReached) {
updateCurrentPageIndex(firstVisibleImageIndex, false, true);
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return;
}
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updateCurrentPageIndex(firstVisibleImageIndex, firstVisibleImageIndex !== lastPageIndex);
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}
static useHandleClick(
scrollElement: HTMLElement | null,
): (event: React.MouseEvent<HTMLDivElement, MouseEvent>) => void {
const { direction: themeDirection } = useTheme();
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const { setIsVisible: setIsOverlayVisible } = useReaderOverlayContext();
const { currentPageIndex, pages } = userReaderStatePagesContext();
const { setShowPreview } = useReaderTapZoneContext();
const { readingMode, readingDirection, isStaticNav } = ReaderService.useSettings();
const openPage = ReaderControls.useOpenPage();
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const openChapter = ReaderControls.useOpenChapter();
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return useCallback(
(e) => {
if (!scrollElement) {
return;
}
const rect = e.currentTarget.getBoundingClientRect();
const rectRelativeX = e.clientX - rect.left;
const rectRelativeY = e.clientY - rect.top;
const action = ReaderTapZoneService.getAction(rectRelativeX, rectRelativeY);
setShowPreview(false);
const isContinuousReadingModeActive = isContinuousReadingMode(readingMode.value);
const scrollDirection =
readingMode.value === ReadingMode.CONTINUOUS_HORIZONTAL ? ScrollDirection.X : ScrollDirection.Y;
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switch (action) {
case TapZoneRegionType.MENU:
setIsOverlayVisible((isVisible) => isStaticNav || !isVisible);
break;
case TapZoneRegionType.PREVIOUS:
case TapZoneRegionType.NEXT:
if (isContinuousReadingModeActive) {
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ReaderControls.scroll(
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action === TapZoneRegionType.PREVIOUS ? ScrollOffset.BACKWARD : ScrollOffset.FORWARD,
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scrollDirection,
readingMode.value,
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readingDirection.value,
themeDirection,
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scrollElement,
openChapter,
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setIsOverlayVisible,
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setShowPreview,
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);
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} else {
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openPage(action === TapZoneRegionType.PREVIOUS ? 'previous' : 'next', 'ltr');
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}
break;
default:
throw new Error(`Unexpected "TapZoneRegionType" (${action})`);
}
},
[
scrollElement,
currentPageIndex,
pages,
readingMode.value,
openPage,
readingDirection.value,
openChapter,
themeDirection,
isStaticNav,
],
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);
}
static useHandleProgressDragging(
openPage: ReturnType<(typeof ReaderControls)['useOpenPage']>,
progressBarRef: RefObject<HTMLDivElement | null>,
isDragging: boolean,
currentPage: TReaderProgressCurrentPage,
pages: ReaderProgressBarProps['pages'],
progressBarPosition: ProgressBarPosition,
getOptionForDirectionFn: typeof getOptionForDirection,
fullSegmentClicks: boolean,
): void {
useEffect(() => {
if (!isDragging) {
return () => undefined;
}
const { isHorizontal } = getProgressBarPositionInfo(progressBarPosition);
const handleMove = (coordinates: { clientX: number; clientY: number }) => {
if (!progressBarRef.current) {
return;
}
const newPageIndex = getNextIndexFromPage(
getPageForMousePos(
coordinates,
progressBarRef.current,
pages,
isHorizontal,
fullSegmentClicks,
getOptionForDirectionFn,
),
);
const hasCurrentPageIndexChanged = getNextIndexFromPage(currentPage) !== newPageIndex;
if (!hasCurrentPageIndexChanged) {
return;
}
openPage(newPageIndex, undefined, false);
};
const handleMouseMove = (e: MouseEvent) => {
handleMove(e);
};
const handleTouchMove = (e: TouchEvent) => {
if (e.touches.length > 0) {
handleMove(e.touches[0]);
}
};
document.addEventListener('mousemove', handleMouseMove);
document.addEventListener('touchmove', handleTouchMove);
return () => {
document.removeEventListener('mousemove', handleMouseMove);
document.removeEventListener('touchmove', handleTouchMove);
};
}, [openPage, isDragging, currentPage, pages, progressBarPosition]);
}
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}