nntrivi2001
9721941962
lib/wheelReports.ts SCROLL_SPEED = 0.7: a touchpad's travel is scaled, and a wheel notch's reports are carried as a fraction (rounded, so the first notch still moves; reset when the direction turns). xterm's own scrollback gets the same scrollSensitivity.
53 lines
2.2 KiB
TypeScript
53 lines
2.2 KiB
TypeScript
/**
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* @file wheelReports.test.ts
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* @description A touchpad scrolls 1:1 with the finger (one report per
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* LINES_PER_REPORT rows, remainder carried), a wheel notch always sends one.
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* @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
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*/
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import { describe, it, expect } from "vitest";
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import { LINES_PER_REPORT, SCROLL_SPEED, wheelReports, type WheelState } from "../wheelReports";
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const ROW = 20;
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const px = (deltaY: number) => ({ deltaY, deltaMode: 0 });
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describe("wheelReports", () => {
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it("adds small touchpad steps up to one report per LINES_PER_REPORT rows", () => {
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const s: WheelState = { partial: 0 };
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let sent = 0;
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// 110 steps of 10px = 1100px = 55 rows, scrolled at SCROLL_SPEED.
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for (let i = 0; i < 110; i++) sent += wheelReports(s, px(10), ROW, 40);
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expect(sent).toBe(Math.trunc((55 * SCROLL_SPEED) / LINES_PER_REPORT));
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});
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it("drops the carried remainder when the swipe turns around", () => {
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const s: WheelState = { partial: 0 };
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wheelReports(s, px(40), ROW, 40); // 2 rows down, nothing sent yet
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let sent = 0;
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// 8 rows up = 5.6 scrolled: one report, the 2 rows down forgotten.
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for (let i = 0; i < 8; i++) sent += wheelReports(s, px(-20), ROW, 40);
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expect(sent).toBe(-1);
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});
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it("sends at least one report for a wheel notch, in either delta mode", () => {
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expect(wheelReports({ partial: 0 }, px(100), ROW, 40)).toBe(1);
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expect(wheelReports({ partial: 0 }, px(-100), ROW, 40)).toBe(-1);
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expect(wheelReports({ partial: 0 }, { deltaY: 3, deltaMode: 1 }, ROW, 40)).toBe(1);
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expect(wheelReports({ partial: 0 }, { deltaY: 1, deltaMode: 2 }, ROW, 40)).toBe(6); // 8 × 0.7
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});
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it("slows a run of wheel notches to SCROLL_SPEED of a report each", () => {
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const s: WheelState = { partial: 0 };
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let sent = 0;
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for (let i = 0; i < 10; i++) sent += wheelReports(s, px(100), ROW, 40);
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expect(sent).toBe(10 * SCROLL_SPEED);
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// Turning around starts from zero: the first notch up moves at once.
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expect(wheelReports(s, px(-100), ROW, 40)).toBe(-1);
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});
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it("sends nothing for a horizontal-only event or an unmeasured terminal", () => {
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expect(wheelReports({ partial: 0 }, px(0), ROW, 40)).toBe(0);
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expect(wheelReports({ partial: 0 }, px(10), 0, 40)).toBe(0);
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});
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});
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