233 lines
8.7 KiB
TypeScript
233 lines
8.7 KiB
TypeScript
import { describe, expect, test } from "bun:test";
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import { createPrevisTransaction, installPrevisTerminalListeners, type PrevisListenerTarget } from "../src/lib/canvas/previs/previs-gesture-transaction";
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type Recorded = { commits: Array<[number, number]>; restores: number[]; active: boolean[]; terminated: number };
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function harness(initial = 0) {
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const log: Recorded = { commits: [], restores: [], active: [], terminated: 0 };
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let value = initial;
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const transaction = createPrevisTransaction<number>({
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read: () => value,
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restore: (snapshot) => {
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value = snapshot;
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log.restores.push(snapshot);
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},
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commit: (from, to) => log.commits.push([from, to]),
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setActive: (next) => log.active.push(next),
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terminateDrag: () => {
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log.terminated += 1;
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},
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});
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return {
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log,
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transaction,
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set: (next: number) => {
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value = next;
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},
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get: () => value,
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};
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}
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function fakeTarget() {
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const listeners = new Map<string, Array<(event: Event) => void>>();
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const target: PrevisListenerTarget = {
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addEventListener: (type, listener) => {
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listeners.set(type, [...(listeners.get(type) || []), listener]);
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},
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removeEventListener: (type, listener) => {
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listeners.set(
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type,
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(listeners.get(type) || []).filter((item) => item !== listener),
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);
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},
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};
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return { target, emit: (type: string, event: Partial<Event> = {}) => (listeners.get(type) || []).forEach((listener) => listener(event as Event)), count: () => [...listeners.values()].reduce((sum, items) => sum + items.length, 0) };
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}
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describe("终止监听的安装生命周期（#1 回归）", () => {
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test("监听先安装、手势后开始，终止事件仍然生效", () => {
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const { log, transaction, set } = harness(5);
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const win = fakeTarget();
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const doc = fakeTarget();
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// 关键顺序：先安装监听，此时并没有活跃手势。
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installPrevisTerminalListeners(transaction, { window: win.target, document: doc.target, isHidden: () => false });
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expect(win.count() + doc.count()).toBeGreaterThan(0);
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transaction.begin();
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set(9);
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win.emit("pointerup");
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expect(log.commits).toEqual([[5, 9]]);
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});
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test("Escape 取消并恢复快照", () => {
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const { log, transaction, set, get } = harness(1);
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const win = fakeTarget();
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const doc = fakeTarget();
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installPrevisTerminalListeners(transaction, { window: win.target, document: doc.target, isHidden: () => false });
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transaction.begin();
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set(42);
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win.emit("keydown", { key: "Escape" } as unknown as Event);
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expect(log.commits).toEqual([]);
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expect(get()).toBe(1);
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expect(log.terminated).toBe(1);
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});
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test("window blur 保留当前可见值并只 commit 一次（#305 验收：失焦不回原点）", () => {
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const { log, transaction, set, get } = harness(2);
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const win = fakeTarget();
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const doc = fakeTarget();
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installPrevisTerminalListeners(transaction, { window: win.target, document: doc.target, isHidden: () => false });
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transaction.begin();
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set(77);
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win.emit("blur");
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expect(log.commits).toEqual([[2, 77]]);
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expect(get()).toBe(77);
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expect(log.restores).toEqual([]);
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// 失焦后再来终态事件不得二次提交。
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win.emit("blur");
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win.emit("pointerup");
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expect(log.commits).toEqual([[2, 77]]);
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});
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test("document hidden 保留当前可见值并只 commit 一次", () => {
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const { log, transaction, set, get } = harness(3);
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const win = fakeTarget();
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const doc = fakeTarget();
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installPrevisTerminalListeners(transaction, { window: win.target, document: doc.target, isHidden: () => true });
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transaction.begin();
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set(88);
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doc.emit("visibilitychange");
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expect(log.commits).toEqual([[3, 88]]);
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expect(get()).toBe(88);
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expect(log.restores).toEqual([]);
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doc.emit("visibilitychange");
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expect(log.commits).toEqual([[3, 88]]);
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});
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test("pointercancel 仍然取消并恢复快照", () => {
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const { log, transaction, set, get } = harness(2);
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const win = fakeTarget();
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const doc = fakeTarget();
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installPrevisTerminalListeners(transaction, { window: win.target, document: doc.target, isHidden: () => false });
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transaction.begin();
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set(77);
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win.emit("pointercancel");
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expect(log.commits).toEqual([]);
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expect(get()).toBe(2);
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expect(log.restores).toEqual([2]);
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});
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test("可见性事件在未隐藏时既不提交也不取消", () => {
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const { log, transaction, set } = harness(4);
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const win = fakeTarget();
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const doc = fakeTarget();
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installPrevisTerminalListeners(transaction, { window: win.target, document: doc.target, isHidden: () => false });
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transaction.begin();
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set(6);
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doc.emit("visibilitychange");
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expect(transaction.active()).toBe(true);
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expect(log.commits).toEqual([]);
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win.emit("pointerup");
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expect(log.commits).toEqual([[4, 6]]);
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});
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test("disposer 摘除全部监听", () => {
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const { log, transaction, set } = harness(0);
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const win = fakeTarget();
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const doc = fakeTarget();
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const dispose = installPrevisTerminalListeners(transaction, { window: win.target, document: doc.target, isHidden: () => false });
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dispose();
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expect(win.count() + doc.count()).toBe(0);
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transaction.begin();
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set(3);
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win.emit("pointerup");
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expect(log.commits).toEqual([]);
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});
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});
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describe("终态幂等与陈旧 base 防护（#4 回归）", () => {
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test("正常结束恰好提交一次，重复终止不再提交", () => {
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const { log, transaction, set } = harness(1);
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transaction.begin();
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set(2);
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transaction.end("commit");
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transaction.end("commit");
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transaction.end("cancel");
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expect(log.commits).toEqual([[1, 2]]);
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expect(log.restores).toEqual([]);
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expect(log.active).toEqual([true, false]);
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});
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test("取消后不提交，且不会残留可被后续消费的 base", () => {
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const { log, transaction, set, get } = harness(10);
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transaction.begin();
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set(20);
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transaction.end("cancel");
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expect(get()).toBe(10);
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// 取消后的 end 不能拿旧 base 再提交一次。
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transaction.end("commit");
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expect(log.commits).toEqual([]);
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expect(transaction.active()).toBe(false);
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});
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test("未开始手势时的终止是空操作，不会误提交普通点击", () => {
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const { log, transaction } = harness(7);
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transaction.end("commit");
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transaction.end("cancel");
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expect(log.commits).toEqual([]);
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expect(log.restores).toEqual([]);
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expect(log.active).toEqual([]);
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});
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test("终态后可以重新开始新手势，base 取新快照而非旧值", () => {
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const { log, transaction, set } = harness(1);
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transaction.begin();
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set(2);
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transaction.end("commit");
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set(50);
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transaction.begin();
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set(60);
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transaction.end("commit");
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expect(log.commits).toEqual([
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[1, 2],
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[50, 60],
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]);
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});
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test("取消后新手势的 base 是恢复后的值", () => {
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const { log, transaction, set } = harness(5);
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transaction.begin();
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set(99);
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transaction.end("cancel");
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transaction.begin();
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set(8);
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transaction.end("commit");
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expect(log.commits).toEqual([[5, 8]]);
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});
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test("read 返回 null 时不进入手势，终止也不提交", () => {
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const log: Array<[number, number]> = [];
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const transaction = createPrevisTransaction<number>({
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read: () => null,
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restore: () => undefined,
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commit: (from, to) => log.push([from, to]),
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setActive: () => undefined,
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});
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transaction.begin();
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expect(transaction.active()).toBe(false);
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transaction.end("commit");
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expect(log).toEqual([]);
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});
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test("提交路径不触发第三方拖拽终止，取消路径才触发", () => {
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const committed = harness(0);
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committed.transaction.begin();
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committed.transaction.end("commit");
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expect(committed.log.terminated).toBe(0);
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const cancelled = harness(0);
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cancelled.transaction.begin();
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cancelled.transaction.end("cancel");
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expect(cancelled.log.terminated).toBe(1);
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});
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});
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