Created
August 7, 2019 02:26
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interface ScrollSectionConfig { | |
height : number; | |
speed : number; | |
} | |
interface Vector { | |
x : number; | |
y : number; | |
} | |
interface ScrollConfig { | |
section : ScrollSectionConfig; | |
gap : ScrollSectionConfig; | |
itemIdentifiers : string; | |
} | |
class ScrollController { | |
private readonly items = document.querySelectorAll(this.config.itemIdentifiers); | |
constructor( | |
private readonly config : ScrollConfig, | |
) { | |
} | |
registerEvent() { | |
// https://stackoverflow.com/questions/4770025/how-to-disable-scrolling-temporarily | |
window.addEventListener('DOMMouseScroll', this.eventHandler, false); | |
window.addEventListener('wheel', this.eventHandler); | |
window.addEventListener('mousewheel', this.eventHandler); | |
window.addEventListener('touchmove', this.eventHandler); | |
document.addEventListener('wheel', this.eventHandler, {passive: false}); // Disable scrolling in Chrome | |
document.addEventListener('mousewheel', this.eventHandler); // older browsers, IE | |
document.addEventListener('keydown', this.keydownHandler); | |
} | |
deregisterEvent() { | |
window.removeEventListener('DOMMouseScroll', this.eventHandler); | |
window.removeEventListener('wheel', this.eventHandler); | |
window.removeEventListener('mousewheel', this.eventHandler); | |
window.removeEventListener('touchmove', this.eventHandler); | |
document.removeEventListener('wheel', this.eventHandler); | |
document.removeEventListener('mousewheel', this.eventHandler); | |
document.removeEventListener('keydown', this.keydownHandler); | |
} | |
private handle ({ x, y } : Vector) { | |
const modifier = this.config.section.speed; | |
const newPos : Vector = { | |
x: this.round(x * modifier + window.scrollX), | |
y: this.round(y * modifier + window.scrollY), | |
}; | |
console.log({ x, y }); | |
this.updateScrollPosition(newPos); | |
return false; | |
} | |
/* TODO create scroll easing function */ | |
private keydownHandler = (event : KeyboardEvent) => { | |
const keys = { | |
"Space": 100, | |
"PageUp": -window.innerHeight, | |
"PageDown": window.innerHeight, | |
"Home": 0, | |
"ArrowUp": 0, | |
"ArrowDown": 0, | |
"ArrowLeft": 0, | |
"ArrowRight": 0, | |
}; | |
if (keys[event.code]) { | |
console.log(event); | |
this.preventDefault(event); | |
this.handle({ x: 0, y: keys[event.code] }); | |
return false; | |
} | |
}; | |
private eventHandler = (event : any) => { | |
this.preventDefault(event); | |
console.log(event); | |
this.handle({ x: event.deltaX, y: event.deltaY }); | |
return false; | |
}; | |
private preventDefault (event : Event) { | |
event.preventDefault(); | |
event.stopImmediatePropagation(); | |
event.returnValue = false; | |
} | |
private updateScrollPosition({ x, y } : Vector) { | |
window.scrollTo(x, y); | |
} | |
private round(number : number, places = 0) { | |
const precision = Math.pow(10, places); | |
return Math.round(number * precision) / precision; | |
} | |
} | |
(() => { | |
const controller = new ScrollController({ | |
section: { | |
speed: 0.2, | |
height: window.innerHeight, | |
}, | |
gap: { | |
speed: 2, | |
height: window.innerHeight * 2, | |
}, | |
itemIdentifiers: '.section', | |
}); | |
controller.registerEvent(); | |
})(); |
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