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componentDidUpdate() { | |
if (this.cloneImage && this.originalWrap) { | |
this.originalImage = this.originalWrap.querySelector('img') | |
this.addEventListener() | |
this.clearStyles() | |
} | |
} | |
componentWillUnmount() { | |
this.removeListeners() | |
} | |
addEventListener = () => { | |
this.originalWrap.addEventListener('mousedown', this.imageHandleDown) | |
this.originalWrap.addEventListener('mouseup', this.imageHandleUp) | |
this.originalWrap.addEventListener('mousewheel', this.scale) | |
} | |
removeListeners = () => { | |
this.originalWrap.removeEventListener('mousedown', this.imageHandleDown) | |
this.originalWrap.removeEventListener('mouseup', this.imageHandleUp) | |
this.originalWrap.removeEventListener('mousewheel', this.scale) | |
} | |
imageHandleDown = (e) => { | |
this.setState({ isPressed: true }, () => { | |
this.originalWrap.onmousemove = this.mouseMove | |
}) | |
} | |
imageHandleUp = () => { | |
this.setState({ isPressed: false }) | |
} | |
mouseMove = (e) => { | |
if (this.state.isPressed) { | |
const { offsetX, offsetY } = this.getMouseCoord(e) | |
const { oldX, oldY } = this.state | |
oldX > offsetX | |
? this.moveX('left') | |
: this.moveX('right') | |
oldY > offsetY | |
? this.moveY('bottom') | |
: this.moveY('top') | |
this.setState({ | |
oldX: offsetX, | |
oldY: offsetY | |
}) | |
} | |
} | |
moveX = (direction) => { | |
direction === 'right' | |
? this.originalImage.style.left = `${parseInt(this.originalImage.style.left || 0) + this.state.swipeSpeed}px` | |
: this.originalImage.style.left = `${parseInt(this.originalImage.style.left || 0) - this.state.swipeSpeed}px` | |
} | |
moveY = (direction) => { | |
direction === 'top' | |
? this.originalImage.style.top = `${parseInt(this.originalImage.style.top || 0) + this.state.swipeSpeed}px` | |
: this.originalImage.style.top = `${parseInt(this.originalImage.style.top || 0) - this.state.swipeSpeed}px` | |
} | |
scale = (e) => { | |
const { deltaY } = e | |
const { oldScale } = this.state | |
e.preventDefault() | |
if (deltaY > 0) { | |
console.log(oldScale) | |
this.setState({ oldScale: oldScale - .2 }, () => { | |
this.originalImage.style.transform = `scale(${oldScale})` | |
}) | |
} else { | |
this.setState({ oldScale: oldScale + .2 }, () => { | |
this.originalImage.style.transform = `scale(${oldScale})` | |
}) | |
} | |
} | |
getMouseCoord = (e) => ({ | |
px: e.x, | |
py: e.y, | |
offsetX: e.offsetX, | |
offsetY: e.offsetY | |
}) | |
clearStyles = () => { | |
this.originalImage.removeAttribute('style') | |
} |
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