Created
December 17, 2019 12:13
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A hook that gives you resize logic that you can attach to an element
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import { useLocalStore } from 'mobx-react-lite'; | |
import { clamp } from 'lodash'; | |
type Props = { | |
height: number; | |
maxHeight?: number; | |
minWidth: number; | |
minHeight: number; | |
measureWidth?: boolean; | |
measureHeight?: boolean; | |
maxWidth?: number; | |
onResize?: ({ size: Size, dragging: boolean }) => void; | |
onResizeFinish?: () => void; | |
width: number; | |
}; | |
export const useResizer = (props: Props) => { | |
const { onResize, onResizeFinish } = props; | |
const state = useLocalStore((source: Props) => { | |
return { | |
fullScreen: false, | |
dragging: false, | |
measureWidth: true, | |
measureHeight: true, | |
originalHeight: source.height, | |
originalWidth: source.width, | |
startY: 0, | |
startX: 0, | |
heightBeforeMinimize: 0, | |
onMouseDown: e => { | |
state.dragging = true; | |
if (source.measureWidth) { | |
state.startX = e.clientX; | |
state.originalWidth = source.width; | |
} | |
if (source.measureHeight) { | |
state.startY = e.clientY; | |
state.originalHeight = source.height; | |
} | |
window.document.body.classList.add('no-select'); | |
document.addEventListener('mousemove', state.onMouseMove); | |
document.addEventListener('mouseup', state.onMouseUp); | |
}, | |
measureSide: ( | |
name, | |
currentPosition, | |
startPosition, | |
original, | |
min, | |
max, | |
currentSize | |
) => { | |
const verticalDistance = currentPosition - startPosition; | |
const difference = original - verticalDistance; | |
const newMeasure = clamp(difference, min, max); | |
const sizeHasChanged = newMeasure !== currentSize; | |
if (sizeHasChanged) { | |
const newSize = { [name]: newMeasure }; | |
onResize && onResize({ size: newSize, dragging: state.dragging }); | |
state[name] = newMeasure; | |
} | |
}, | |
onMouseMove: e => { | |
if (state.dragging) { | |
if (source.measureHeight) { | |
state.measureSide( | |
'height', | |
e.clientY, | |
state.startY, | |
state.originalHeight, | |
source.minHeight, | |
source.maxHeight, | |
source.height | |
); | |
} | |
if (source.measureWidth) { | |
state.measureSide( | |
'width', | |
e.clientX, | |
state.startX, | |
state.originalWidth, | |
source.minWidth, | |
source.maxWidth, | |
source.height | |
); | |
} | |
} | |
}, | |
onMouseUp: () => { | |
state.dragging = false; | |
window.document.body.classList.remove('no-select'); | |
document.removeEventListener('mousemove', state.onMouseMove); | |
document.removeEventListener('mouseup', state.onMouseUp); | |
onResizeFinish && onResizeFinish(); | |
}, | |
}; | |
}, props); | |
return state; | |
}; |
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