homebrewery/client/homebrew/brewRenderer/toolBar/toolBar.jsx

require('./toolBar.less');
const React = require('react');
const { useState, useEffect } = React;
const _ = require('lodash')

const MAX_ZOOM = 300;
const MIN_ZOOM = 10;

const ToolBar = ({ onZoomChange, currentPage, onPageChange, totalPages })=>{
	const [state, setState] = useState({
		currentPage     : currentPage,
		totalPages      : totalPages,
		pageNumberInput : currentPage,
	});

	const [zoomLevel, setZoomLevel] = useState(100);

	useEffect(()=>{
		onZoomChange(zoomLevel);
	}, [zoomLevel]);

	useEffect(()=>{
		setState((prevState)=>({
			...prevState,
			currentPage     : currentPage,
			pageNumberInput : currentPage,
		}));
	}, [currentPage]);

	const handleZoomChange = (delta)=>{
		const zoomChange = _.clamp(zoomLevel + delta, minZoom, maxZoom);

		setZoomLevel(zoomChange);
	};

	return (
		<div className='toolBar'>
			<div className='tool'>
				<button
					onClick={()=>handleZoomChange(-20)}
					disabled={zoomLevel <= minZoom}
				>
					<i className='fas fa-magnifying-glass-minus' />
				</button>
			</div>
			<div className='tool'>
				<input
					className='slider'
					type='range'
					name='zoom'
					list='zoomLevels'
					min={minZoom}
					max={maxZoom}
					step='1'
					value={zoomLevel}
					onChange={(e)=>{setZoomLevel(parseInt(e.target.value));}}
				/>
				<datalist id='zoomLevels'>
					<option value='100' />
				</datalist>
			</div>

			<div className='tool'>
				<button
					onClick={()=>handleZoomChange(20)}
					disabled={zoomLevel >= maxZoom}
				>
					<i className='fas fa-magnifying-glass-plus' />
				</button>
			</div>
			<div className='tool'>
				<button
					className='previousPage'
					onClick={()=>{
						console.log(`page is ${state.currentPage}`);
						onPageChange(state.currentPage - 2);
					}}
					disabled={state.currentPage <= 1}
				>
					<i className='fas fa-arrow-left'></i>
				</button>
			</div>

			<input
				type='number'
				name='page'
				min={1}
				max={state.totalPages}
				id='pageInput'
				value={state.pageNumberInput}
				onChange={(e)=>handleInputChange(e.target.value, 'page')}
				onBlur={(e)=>{
					parseInt(state.pageNumberInput) === state.currentPage ||
                        onPageChange(parseInt(state.pageNumberInput) - 1);
				}}
				onKeyPress={(e)=>{
					if(e.key === 'Enter') {
						e.target.blur();
					}
				}}
			/>

			<div className='tool'>
				<button
					className='nextPage'
					onClick={()=>{
						console.log(
							`page is ${state.currentPage} and i move to ${state.currentPage}`
						);
						onPageChange(state.currentPage);
					}}
					disabled={state.currentPage >= state.totalPages}
				>
					<i className='fas fa-arrow-right'></i>
				</button>
			</div>
		</div>
	);
};

module.exports = ToolBar;