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Refactored scrolling.ts

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This commit is contained in:
MatiasStorm 2020-05-17 16:59:15 +02:00
parent 9ca4a08358
commit 5f72ce6561
1 changed files with 42 additions and 42 deletions
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84
src/content/scrolling.ts
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@ -31,11 +31,11 @@ class ScrollingData {
duration = 0
/** elem: The element that should be scrolled
* pos: "scrollLeft" if the element should be scrolled on the horizontal axis, "scrollTop" otherwise
* scrollDirection: "scrollLeft" if the element should be scrolled on the horizontal axis, "scrollTop" otherwise
*/
constructor(
private elem: Node,
private pos: scrollingDirection = "scrollTop",
private scrollDirection: scrollingDirection = "scrollTop",
) {}
/** Computes where the element should be.
@ -44,41 +44,41 @@ class ScrollingData {
* It might be useful to make this function more configurable by making it
* accept an argument instead of using performance.now()
*/
getStep() {
private getStep() : number {
if (this.startTime === undefined) {
this.startTime = performance.now()
}
const elapsed = performance.now() - this.startTime
// If the animation should be done, return the position the element should have
if (elapsed >= this.duration || this.elem[this.pos] === this.endPos)
if (elapsed >= this.duration || this.elem[this.scrollDirection] === this.endPos)
return this.endPos
let result = this.startPos + (((this.endPos - this.startPos) * elapsed) / this.duration)
let pixelToScrollTo : number = this.startPos + (((this.endPos - this.startPos) * elapsed) / this.duration)
if (this.startPos < this.endPos) {
// We need to ceil() because only highdpi screens have a decimal this.elem[this.pos]
result = Math.ceil(result)
pixelToScrollTo = Math.ceil(pixelToScrollTo)
// We *have* to make progress, otherwise we'll think the element can't be scrolled
if (result == this.elem[this.pos])
result += 1
if (pixelToScrollTo == this.elem[this.scrollDirection])
pixelToScrollTo += 1
} else {
result = Math.floor(result)
if (result == this.elem[this.pos])
result -= 1
pixelToScrollTo = Math.floor(pixelToScrollTo)
if (pixelToScrollTo == this.elem[this.scrollDirection])
pixelToScrollTo -= 1
}
return result
return pixelToScrollTo
}
/** Updates the position of this.elem, returns true if the element has been scrolled, false otherwise. */
scrollStep() {
const val = this.elem[this.pos]
this.elem[this.pos] = this.getStep()
return val !== this.elem[this.pos]
private scrollStep() : boolean{
const val = this.elem[this.scrollDirection]
this.elem[this.scrollDirection] = this.getStep()
return val !== this.elem[this.scrollDirection]
}
/** Calls this.scrollStep() until the element has been completely scrolled
* or the scrolling animation is complete */
scheduleStep() {
private scheduleStep() {
// If scrollStep() scrolled the element, reschedule a step
// Otherwise, register that the element stopped scrolling
window.requestAnimationFrame(() =>
@ -86,10 +86,10 @@ class ScrollingData {
)
}
scroll(distance: number, duration: number) {
public scroll(distance: number, duration: number) : boolean {
this.duration = duration
this.startTime = performance.now()
this.startPos = this.elem[this.pos]
this.startPos = this.elem[this.scrollDirection]
// If we're already scrolling, update the endPos based off the current endPos
if (this.scrolling) {
this.endPos = this.endPos + distance
@ -115,17 +115,17 @@ const verticallyScrolling = new Map<Node, ScrollingData>()
* last duration milliseconds
*/
export async function scroll(
x: number = 0,
y: number = 0,
xDistance: number = 0,
yDinstance: number = 0,
e: Node,
duration?: number,
) {
) : Promise<Boolean> {
const smooth = await getSmooth()
if (smooth === "false") duration = 0
else if (duration === undefined) duration = await getDuration()
let result = false
if (x !== 0) {
let didScroll = false
if (xDistance !== 0) {
// Don't create a new ScrollingData object if the element is already
// being scrolled
let scrollData = horizontallyScrolling.get(e)
@ -133,17 +133,17 @@ export async function scroll(
scrollData = new ScrollingData(e, "scrollLeft")
horizontallyScrolling.set(e, scrollData)
}
result = result || scrollData.scroll(x, duration)
didScroll = didScroll || scrollData.scroll(xDistance, duration)
}
if (y !== 0) {
if (yDinstance !== 0) {
let scrollData = verticallyScrolling.get(e)
if (!scrollData) {
scrollData = new ScrollingData(e, "scrollTop")
verticallyScrolling.set(e, scrollData)
}
result = result || scrollData.scroll(y, duration)
didScroll = didScroll || scrollData.scroll(yDinstance, duration)
}
return result
return didScroll
}
let lastRecursiveScrolled = null
@ -156,15 +156,15 @@ let lastY = 0
* attempts at optimizing the function in order to reduce GC pressure.
*/
export async function recursiveScroll(
x: number,
y: number,
xDistance: number,
yDistance: number,
node?: Element,
stopAt?: Element,
) {
let startingFromCached = false
if (!node) {
const sameSignX = x < 0 === lastX < 0
const sameSignY = y < 0 === lastY < 0
const sameSignX = xDistance < 0 === lastX < 0
const sameSignY = yDistance < 0 === lastY < 0
if (lastRecursiveScrolled && sameSignX && sameSignY) {
// We're scrolling in the same direction as the previous time so
// let's try to pick up from where we left
@ -178,19 +178,19 @@ export async function recursiveScroll(
do {
// If node is undefined or if we managed to scroll it
if (
(await scroll(x, y, treeWalker.currentNode)) ||
(await scroll(xDistance, yDistance, treeWalker.currentNode)) ||
((treeWalker.currentNode as any).contentDocument &&
!(treeWalker.currentNode as any).src.startsWith("moz-extension://") &&
(await recursiveScroll(
x,
y,
xDistance,
yDistance,
(treeWalker.currentNode as any).contentDocument.body,
)))
) {
// Cache the node for next time and stop trying to scroll
lastRecursiveScrolled = treeWalker.currentNode
lastX = x
lastY = y
lastX = xDistance
lastY = yDistance
return true
}
} while (treeWalker.nextNode())
@ -199,17 +199,17 @@ export async function recursiveScroll(
treeWalker = document.createTreeWalker(node, NodeFilter.SHOW_ELEMENT)
do {
// If node is undefined or if we managed to scroll it
if (await scroll(x, y, treeWalker.currentNode)) {
if (await scroll(xDistance, yDistance, treeWalker.currentNode)) {
// Cache the node for next time and stop trying to scroll
lastRecursiveScrolled = treeWalker.currentNode
lastX = x
lastY = y
lastX = xDistance
lastY = yDistance
return true
}
} while (treeWalker.previousNode())
}
lastRecursiveScrolled = null
lastX = x
lastY = y
lastX = xDistance
lastY = yDistance
return false
}