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Desktop: Add zoom feature on PDF viewer (laurent22#6748)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| import { useRef, useEffect, MutableRefObject } from 'react'; | ||
| import { ScaledSize } from '../pdfSource'; | ||
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| export interface ScrollSaver { | ||
| container: MutableRefObject<HTMLElement>; | ||
| scaledSize: ScaledSize; | ||
| pdfId: string; | ||
| rememberScroll: boolean; | ||
| } | ||
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| const useScrollSaver = ({ container, scaledSize, pdfId, rememberScroll }: ScrollSaver) => { | ||
| const currentScaleSize = useRef(scaledSize); | ||
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| useEffect(() => { | ||
| let scrollTimer: number = null; | ||
| const containerElement = container.current; | ||
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| const saveScroll = () => { | ||
| if (!currentScaleSize.current) return; | ||
| const scale = currentScaleSize.current.scale; | ||
| const scrollTop = container.current.scrollTop / scale; | ||
| if (rememberScroll && pdfId) { | ||
| sessionStorage.setItem(`pdf.${pdfId}.scrollTop`, `${scrollTop}`); | ||
| } | ||
| }; | ||
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| const onScroll = () => { | ||
| if (scrollTimer) { | ||
| clearTimeout(scrollTimer); | ||
| scrollTimer = null; | ||
| } | ||
| scrollTimer = window.setTimeout(saveScroll, 200); | ||
| }; | ||
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| containerElement.addEventListener('scroll', onScroll); | ||
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| return () => { | ||
| containerElement.removeEventListener('scroll', onScroll); | ||
| if (scrollTimer) { | ||
| clearTimeout(scrollTimer); | ||
| scrollTimer = null; | ||
| } | ||
| }; | ||
| }, [container, pdfId, rememberScroll, currentScaleSize]); | ||
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| useEffect(() => { | ||
| currentScaleSize.current = scaledSize; | ||
| } , [scaledSize]); | ||
|
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| return scaledSize; | ||
| }; | ||
|
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| export default useScrollSaver; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| import React from 'react'; | ||
| import styled from 'styled-components'; | ||
| import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'; | ||
| import { faMinus, faPlus } from '@fortawesome/free-solid-svg-icons'; | ||
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| const ZoomGroup = styled.div<{ size: number }>` | ||
| display: flex; | ||
| justify-content: center; | ||
| align-items: center; | ||
| flex-flow: row; | ||
| color: var(--grey); | ||
| cursor: initial; | ||
| font-size: ${props => props.size}rem; | ||
| padding: 0.2rem 0.4rem; | ||
| user-select: none; | ||
| border-radius: 5px; | ||
| &:hover { | ||
| background: #7676764d; | ||
| } | ||
| svg:hover { | ||
| color: var(--secondary); | ||
| } | ||
| `; | ||
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| export interface ZoomControlsProps { | ||
| zoom: number; | ||
| onChange: (zoom: number)=> void; | ||
| size?: number; | ||
| } | ||
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| export default function ZoomControls(props: ZoomControlsProps) { | ||
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| const zoomIn = () => { | ||
| props.onChange(Math.min(props.zoom + 0.25, 2)); | ||
| }; | ||
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| const zoomOut = () => { | ||
| props.onChange(Math.max(props.zoom - 0.25, 0.5)); | ||
| }; | ||
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| return (<ZoomGroup size={props.size || 0.8}> | ||
| <FontAwesomeIcon icon={faMinus} title="Zoom Out" style={{ paddingRight: '0.2rem', cursor: 'pointer' }} onClick={zoomOut} /> | ||
| <span style={{ color: 'grey' }} >{props.zoom * 100}%</span> | ||
| <FontAwesomeIcon icon={faPlus} title="Zoom In" style={{ paddingLeft: '0.2rem', cursor: 'pointer' }} onClick={zoomIn} /> | ||
| </ZoomGroup>); | ||
| } |
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