browser_caret_rect.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

async function getCaretRect(browser, id) {

  // The caret rect can only be queried on LocalAccessible. On Windows, we do

  // send it across processes with caret events, but this currently can't be

  // queried outside of the event, nor with XPCOM.

  const [x, y, w, h] = await invokeContentTask(browser, [id], contentId => {

    const node = content.document.getElementById(contentId);

    const contentAcc = content.CommonUtils.accService.getAccessibleFor(node);

    contentAcc.QueryInterface(Ci.nsIAccessibleText);

    const caretX = {};

    const caretY = {};

    const caretW = {};

    const caretH = {};

    contentAcc.getCaretRect(caretX, caretY, caretW, caretH);

    return [caretX.value, caretY.value, caretW.value, caretH.value];

});

  info(`Caret bounds: ${x}, ${y}, ${w}, ${h}`);

  return [x, y, w, h];

async function testCaretRect(browser, docAcc, id, offset) {

  const acc = findAccessibleChildByID(docAcc, id, [nsIAccessibleText]);

  is(acc.caretOffset, offset, `Caret at offset ${offset}`);

  const charX = {};

  const charY = {};

  const charW = {};

  const charH = {};

  const atEnd = offset == acc.characterCount;

  const empty = offset == 0 && atEnd;

  const queryOffset = atEnd && !empty ? offset - 1 : offset;

  acc.getCharacterExtents(

    queryOffset,

    charX,

    charY,

    charW,

    charH,

    COORDTYPE_SCREEN_RELATIVE

);

  info(

    `Character ${queryOffset} bounds: ${charX.value}, ${charY.value}, ${charW.value}, ${charH.value}`

);

  const [caretX, caretY, caretW, caretH] = await getCaretRect(browser, id);

  if (atEnd) {

    Assert.greater(caretX, charX.value, "Caret x after last character x");

  } else {

    is(caretX, charX.value, "Caret x same as character x");

  is(caretY, charY.value, "Caret y same as character y");

  is(caretW, 1, "Caret width is 1");

  if (!empty) {

    is(caretH, charH.value, "Caret height same as character height");

function getAccBounds(acc) {

  const x = {};

  const y = {};

  const w = {};

  const h = {};

  acc.getBounds(x, y, w, h);

  return [x.value, y.value, w.value, h.value];

/**

 * Test the caret rect in content documents.

*/

addAccessibleTask(

<input id="input" value="ab">

<input id="emptyInput">

`,

  async function (browser, docAcc) {

    async function runTests() {

      const input = findAccessibleChildByID(docAcc, "input", [

        nsIAccessibleText,

]);

      info("Focusing input");

      let caretMoved = waitForEvent(EVENT_TEXT_CARET_MOVED, input);

      input.takeFocus();

      await caretMoved;

      await testCaretRect(browser, docAcc, "input", 0);

      info("Setting caretOffset to 1");

      caretMoved = waitForEvent(EVENT_TEXT_CARET_MOVED, input);

      input.caretOffset = 1;

      await caretMoved;

      await testCaretRect(browser, docAcc, "input", 1);

      info("Setting caretOffset to 2");

      caretMoved = waitForEvent(EVENT_TEXT_CARET_MOVED, input);

      input.caretOffset = 2;

      await caretMoved;

      await testCaretRect(browser, docAcc, "input", 2);

      info("Resetting caretOffset to 0");

      input.caretOffset = 0;

      const emptyInput = findAccessibleChildByID(docAcc, "emptyInput", [

        nsIAccessibleText,

]);

      info("Focusing emptyInput");

      caretMoved = waitForEvent(EVENT_TEXT_CARET_MOVED, emptyInput);

      emptyInput.takeFocus();

      await caretMoved;

      await testCaretRect(browser, docAcc, "emptyInput", 0);

    await runTests();

    // Check that the caret rect is correct when the title bar is shown.

    if (LINUX || Services.env.get("MOZ_HEADLESS")) {

      // Disabling tabs in title bar doesn't change the bounds on Linux or in

      // headless mode.

      info("Skipping title bar tests");

      return;

    const [, origDocY] = getAccBounds(docAcc);

    info("Showing title bar");

    let titleBarChanged = BrowserTestUtils.waitForMutationCondition(

      document.documentElement,

      { attributes: true, attributeFilter: ["customtitlebar"] },

      () => !document.documentElement.hasAttribute("customtitlebar")

);

    await SpecialPowers.pushPrefEnv({

      set: [["browser.tabs.inTitlebar", false]],

});

    await titleBarChanged;

    const [, newDocY] = getAccBounds(docAcc);

    Assert.greater(

      newDocY,

      origDocY,

      "Doc has larger y after title bar change"

);

    await runTests();

    await SpecialPowers.popPrefEnv();

},

  { chrome: true, topLevel: true }

);