browser_animation_emitMutations.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Test that the AnimationsActor emits events about changed animations on a

// node after getAnimationPlayersForNode was called on that node.

add_task(async function () {

  const { target, walker, animations } = await initAnimationsFrontForUrl(

    MAIN_DOMAIN + "animation.html"

);

  info("Retrieve a non-animated node");

  const node = await walker.querySelector(walker.rootNode, ".not-animated");

  info("Retrieve the animation player for the node");

  const players = await animations.getAnimationPlayersForNode(node);

  is(players.length, 0, "The node has no animation players");

  info("Listen for new animations");

  let onMutations = once(animations, "mutations");

  info("Add a couple of animation on the node");

  await node.modifyAttributes([

    { attributeName: "class", newValue: "multiple-animations" },

]);

  let changes = await onMutations;

  ok(true, "The mutations event was emitted");

  is(changes.length, 2, "There are 2 changes in the mutation event");

ok(

    changes.every(({ type }) => type === "added"),

    "Both changes are additions"

);

  const names = changes.map(c => c.player.initialState.name).sort();

  is(names[0], "glow", "The animation 'glow' was added");

  is(names[1], "move", "The animation 'move' was added");

  info("Store the 2 new players for comparing later");

  const p1 = changes[0].player;

  const p2 = changes[1].player;

  info("Listen for removed animations");

  onMutations = once(animations, "mutations");

  info("Remove the animation css class on the node");

  await node.modifyAttributes([

    { attributeName: "class", newValue: "not-animated" },

]);

  changes = await onMutations;

  ok(true, "The mutations event was emitted");

  is(changes.length, 2, "There are 2 changes in the mutation event");

ok(

    changes.every(({ type }) => type === "removed"),

    "Both are removals"

);

ok(

    changes[0].player === p1 || changes[0].player === p2,

    "The first removed player was one of the previously added players"

);

ok(

    changes[1].player === p1 || changes[1].player === p2,

    "The second removed player was one of the previously added players"

);

  await target.destroy();

  gBrowser.removeCurrentTab();

});