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import React from "react";
import { act, render } from "./test-utils";
import { API } from "./helpers/api";
import { Excalidraw } from "../index";
import { vi } from "vitest";
const { h } = window;
const waitForNextAnimationFrame = () => {
return act(
() =>
new Promise((resolve) => {
requestAnimationFrame(() => {
requestAnimationFrame(resolve);
});
}),
);
};
describe("fitToContent", () => {
it("should zoom to fit the selected element", async () => {
await render(<Excalidraw />);
h.state.width = 10;
h.state.height = 10;
const rectElement = API.createElement({
width: 50,
height: 100,
x: 50,
y: 100,
});
expect(h.state.zoom.value).toBe(1);
act(() => {
h.app.scrollToContent(rectElement, { fitToContent: true });
});
// element is 10x taller than the viewport size,
// zoom should be at least 1/10
expect(h.state.zoom.value).toBeLessThanOrEqual(0.1);
});
it("should zoom to fit multiple elements", async () => {
await render(<Excalidraw />);
const topLeft = API.createElement({
width: 20,
height: 20,
x: 0,
y: 0,
});
const bottomRight = API.createElement({
width: 20,
height: 20,
x: 80,
y: 80,
});
h.state.width = 10;
h.state.height = 10;
expect(h.state.zoom.value).toBe(1);
act(() => {
h.app.scrollToContent([topLeft, bottomRight], {
fitToContent: true,
});
});
// elements take 100x100, which is 10x bigger than the viewport size,
// zoom should be at least 1/10
expect(h.state.zoom.value).toBeLessThanOrEqual(0.1);
});
it("should scroll the viewport to the selected element", async () => {
await render(<Excalidraw />);
h.state.width = 10;
h.state.height = 10;
const rectElement = API.createElement({
width: 100,
height: 100,
x: 100,
y: 100,
});
expect(h.state.zoom.value).toBe(1);
expect(h.state.scrollX).toBe(0);
expect(h.state.scrollY).toBe(0);
act(() => {
h.app.scrollToContent(rectElement);
});
// zoom level should stay the same
expect(h.state.zoom.value).toBe(1);
// state should reflect some scrolling
expect(h.state.scrollX).not.toBe(0);
expect(h.state.scrollY).not.toBe(0);
});
});
describe("fitToContent animated", () => {
beforeEach(() => {
vi.spyOn(window, "requestAnimationFrame");
});
afterEach(() => {
vi.restoreAllMocks();
});
it("should ease scroll the viewport to the selected element", async () => {
await render(<Excalidraw />);
h.state.width = 10;
h.state.height = 10;
const rectElement = API.createElement({
width: 100,
height: 100,
x: -100,
y: -100,
});
act(() => {
h.app.scrollToContent(rectElement, { animate: true });
});
expect(window.requestAnimationFrame).toHaveBeenCalled();
// Since this is an animation, we expect values to change through time.
// We'll verify that the scroll values change at 50ms and 100ms
expect(h.state.scrollX).toBe(0);
expect(h.state.scrollY).toBe(0);
await waitForNextAnimationFrame();
const prevScrollX = h.state.scrollX;
const prevScrollY = h.state.scrollY;
expect(h.state.scrollX).not.toBe(0);
expect(h.state.scrollY).not.toBe(0);
await waitForNextAnimationFrame();
expect(h.state.scrollX).not.toBe(prevScrollX);
expect(h.state.scrollY).not.toBe(prevScrollY);
});
it("should animate the scroll but not the zoom", async () => {
await render(<Excalidraw />);
h.state.width = 50;
h.state.height = 50;
const rectElement = API.createElement({
width: 100,
height: 100,
x: 100,
y: 100,
});
expect(h.state.scrollX).toBe(0);
expect(h.state.scrollY).toBe(0);
act(() => {
h.app.scrollToContent(rectElement, { animate: true, fitToContent: true });
});
expect(window.requestAnimationFrame).toHaveBeenCalled();
await waitForNextAnimationFrame();
const prevScrollX = h.state.scrollX;
const prevScrollY = h.state.scrollY;
expect(h.state.scrollX).not.toBe(0);
expect(h.state.scrollY).not.toBe(0);
await waitForNextAnimationFrame();
expect(h.state.scrollX).not.toBe(prevScrollX);
expect(h.state.scrollY).not.toBe(prevScrollY);
});
});
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