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/*
An object for getting/setting scroll-related information for an element.
Internally, this is done very differently for window versus DOM element,
so this object serves as a common interface.
*/
export abstract class ScrollController {
abstract getScrollTop(): number
abstract getScrollLeft(): number
abstract setScrollTop(top: number): void
abstract setScrollLeft(left: number): void
abstract getClientWidth(): number
abstract getClientHeight(): number
abstract getScrollWidth(): number
abstract getScrollHeight(): number
getMaxScrollTop() {
return this.getScrollHeight() - this.getClientHeight()
}
getMaxScrollLeft() {
return this.getScrollWidth() - this.getClientWidth()
}
canScrollVertically() {
return this.getMaxScrollTop() > 0
}
canScrollHorizontally() {
return this.getMaxScrollLeft() > 0
}
canScrollUp() {
return this.getScrollTop() > 0
}
canScrollDown() {
return this.getScrollTop() < this.getMaxScrollTop()
}
canScrollLeft() {
return this.getScrollLeft() > 0
}
canScrollRight() {
return this.getScrollLeft() < this.getMaxScrollLeft()
}
}
export class ElementScrollController extends ScrollController {
el: HTMLElement
constructor(el: HTMLElement) {
super()
this.el = el
}
getScrollTop() {
return this.el.scrollTop
}
getScrollLeft() {
return this.el.scrollLeft
}
setScrollTop(top: number) {
this.el.scrollTop = top
}
setScrollLeft(left: number) {
this.el.scrollLeft = left
}
getScrollWidth() {
return this.el.scrollWidth
}
getScrollHeight() {
return this.el.scrollHeight
}
getClientHeight() {
return this.el.clientHeight
}
getClientWidth() {
return this.el.clientWidth
}
}
export class WindowScrollController extends ScrollController {
getScrollTop() {
return window.pageYOffset
}
getScrollLeft() {
return window.pageXOffset
}
setScrollTop(n: number) {
window.scroll(window.pageXOffset, n)
}
setScrollLeft(n: number) {
window.scroll(n, window.pageYOffset)
}
getScrollWidth() {
return document.documentElement.scrollWidth
}
getScrollHeight() {
return document.documentElement.scrollHeight
}
getClientHeight() {
return document.documentElement.clientHeight
}
getClientWidth() {
return document.documentElement.clientWidth
}
}