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feat(scrcpy): improve integer scrolling accumulation

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Simon Chan 2025-06-24 22:40:53 +08:00
parent e0def5b8ac
commit 81f39bf5f3
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1 changed files with 18 additions and 19 deletions
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37
libraries/scrcpy/src/1_15/impl/scroll-controller.ts
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@ -34,33 +34,32 @@ export class ScrollController implements ScrcpyScrollController {
protected processMessage(
message: ScrcpyInjectScrollControlMessage,
): ScrcpyInjectScrollControlMessage | undefined {
this.#accumulatedX += message.scrollX;
this.#accumulatedY += message.scrollY;
// Ref https://github.com/libsdl-org/SDL/blob/878ea48b607f23e4ec8c12d1395b86ab529e30d0/src/events/SDL_mouse.c#L897-L914
let scrollX = 0;
let scrollY = 0;
if (this.#accumulatedX >= 1) {
scrollX = 1;
this.#accumulatedX = 0;
} else if (this.#accumulatedX <= -1) {
scrollX = -1;
this.#accumulatedX = 0;
if (Math.sign(message.scrollX) !== Math.sign(this.#accumulatedX)) {
this.#accumulatedX = message.scrollX;
} else {
this.#accumulatedX += message.scrollX;
}
if (this.#accumulatedY >= 1) {
scrollY = 1;
this.#accumulatedY = 0;
} else if (this.#accumulatedY <= -1) {
scrollY = -1;
this.#accumulatedY = 0;
if (Math.sign(message.scrollY) !== Math.sign(this.#accumulatedY)) {
this.#accumulatedY = message.scrollY;
} else {
this.#accumulatedY += message.scrollY;
}
if (scrollX === 0 && scrollY === 0) {
const integerX = this.#accumulatedX | 0;
this.#accumulatedX -= integerX;
const integerY = this.#accumulatedY | 0;
this.#accumulatedY -= integerY;
if (integerX === 0 && integerY === 0) {
return undefined;
}
message.scrollX = scrollX;
message.scrollY = scrollY;
message.scrollX = integerX;
message.scrollY = integerY;
return message;
}