racket-wiki/test/cmap-selection-layout.test.js

"use strict";

const test = require("node:test");
const assert = require("node:assert/strict");

function fakeNode(attributes) {
  const state = { ...attributes };
  return {
    attr(value) {
      if (typeof value === "string") return state[value];
      Object.assign(state, value);
      return this;
    },
    onRendered() {}, onMove() {}, onMoveEnd() {}, visible() {}, redraw() {},
    toFront() {}, remove() {}, element: () => null
  };
}

async function loadEditorFactory() {
  global.Element = class Element {};
  global.document = {
    currentScript: null,
    styleSheets: [],
    body: { append() {} },
    createElement: () => ({ style: {}, remove() {} })
  };
  global.window = {
    setTimeout,
    clearTimeout,
    requestAnimationFrame: (callback) => callback()
  };
  await import("../static/js/cmap/cmap-racket-wiki.js");
  return global.window.RacketWikiCmap;
}

test("the last selected concept determines target size and alignment", async () => {
  const factory = await loadEditorFactory();
  const map = {
    onSelection() {},
    onActivation() {},
    node: (attributes) => fakeNode(attributes)
  };
  const canvas = {
    addEventListener() {}, querySelector: () => null,
    clientWidth: 1200, clientHeight: 800, scrollLeft: 0, scrollTop: 0,
    isConnected: true
  };
  const editor = factory.createEditor(canvas, { createDiagramEngine: () => map });
  const first = editor.addItem({
    id: 1, label: "First", externalUrl: "https://example.com/first",
    x: 10, y: 10, width: 100, height: 40
  });
  const second = editor.addItem({ id: 2, label: "Second", x: 80, y: 100, width: 120, height: 45 });
  const third = editor.addItem({ id: 3, label: "Third", x: 250, y: 250, width: 200, height: 60 });
  assert.equal(editor.conceptRepository().concept(first.conceptId).label, "First");
  assert.equal(editor.conceptMapModel().item(first.id).conceptId, first.conceptId);
  assert.equal("node" in editor.conceptRepository().concept(first.conceptId), false,
    "repository concepts never contain drawing nodes");
  assert.equal("node" in editor.conceptMapModel().item(first.id), false,
    "map placements never contain drawing nodes");
  const savedDocument = editor.toDocument();
  assert.equal(
    savedDocument.concepts.find((concept) => concept.id === first.conceptId).externalUrl,
    "https://example.com/first",
    "external links are serialized as shared concept content"
  );
  const reloaded = factory.createEditor(canvas, { createDiagramEngine: () => map });
  reloaded.loadModel(editor.currentModel());
  assert.equal(
    reloaded.toDocument().concepts.find((concept) => concept.id === first.conceptId).externalUrl,
    "https://example.com/first",
    "external links survive an editor model round-trip"
  );
  editor.selectItem(first);
  editor.selectItem(third, { additive: true });
  editor.selectItem(second, { additive: true });
  editor.resetHistory();

  assert.equal(editor.selected(), second, "the last selected concept is the target object");
  assert.equal(editor.canLayoutSelection("distribute-horizontal"), true);
  assert.equal(editor.canLayoutSelection("distribute-vertical"), true);
  editor.applySelectionLayout("align-right");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("x"))),
    [100, 80, 0]);

  first.node.attr({ x: 10, y: 10 });
  second.node.attr({ x: 80, y: 100 });
  third.node.attr({ x: 250, y: 250 });
  editor.applySelectionLayout("align-center");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("x"))),
    [90, 80, 40]);

  first.node.attr({ x: 10, y: 10 });
  second.node.attr({ x: 80, y: 100 });
  third.node.attr({ x: 250, y: 250 });
  editor.applySelectionLayout("align-left");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("x"))),
    [80, 80, 80]);

  first.node.attr({ x: 10, y: 10 });
  second.node.attr({ x: 80, y: 100 });
  third.node.attr({ x: 250, y: 250 });
  editor.applySelectionLayout("align-bottom");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("y"))),
    [105, 100, 85]);

  first.node.attr({ x: 10, y: 10 });
  second.node.attr({ x: 80, y: 100 });
  third.node.attr({ x: 250, y: 250 });
  editor.applySelectionLayout("align-middle");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("y"))),
    [102.5, 100, 92.5]);

  first.node.attr({ x: 10, y: 10 });
  second.node.attr({ x: 80, y: 100 });
  third.node.attr({ x: 250, y: 250 });
  editor.applySelectionLayout("align-top");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("y"))),
    [100, 100, 100]);

  first.node.attr({ x: 10, y: 10 });
  second.node.attr({ x: 80, y: 100 });
  third.node.attr({ x: 250, y: 250 });
  editor.applySelectionLayout("distribute-horizontal");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("x"))),
    [10, 120, 250], "outer items stay fixed and horizontal gaps become equal");

  first.node.attr({ x: 10, y: 10 });
  second.node.attr({ x: 80, y: 100 });
  third.node.attr({ x: 250, y: 250 });
  editor.applySelectionLayout("distribute-vertical");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("y"))),
    [10, 127.5, 250], "outer items stay fixed and the middle item receives an equal gap");

  editor.applySelectionLayout("same-width");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("width"))),
    [120, 120, 120]);
  editor.applySelectionLayout("same-height");
  assert.deepEqual([first, second, third].map((item) => Number(item.node.attr("height"))),
    [45, 45, 45]);

  first.node.attr({ width: 90, height: 35 });
  third.node.attr({ width: 180, height: 70 });
  editor.applySelectionLayout("same-size");
  assert.deepEqual([first, second, third].map((item) =>
    [Number(item.node.attr("width")), Number(item.node.attr("height"))]),
  [[120, 45], [120, 45], [120, 45]]);

  await new Promise((resolve) => setTimeout(resolve, 0));
  assert.equal(editor.canUndo(), true, "layout commands participate in undo and autosave history");
  assert.deepEqual(editor.toDocument().items.map((item) => [item.width, item.height]),
    [[120, 45], [120, 45], [120, 45]]);
});