author Iulian Moraru <>
Sat, 10 Dec 2022 00:13:30 +0200
changeset 645198 c5346fa57f5c70e9c5a35cf233b28dcc55954c5d
parent 534829 d0b8c9d1e2371d47ca3470e082a444e2f8f241f7
permissions -rw-r--r--
Backed out changeset 5687d0e50d11 (bug 1752089) as per John Schanck's request and for causing Bug 1804979. a=backout

<meta charset="utf-8">
<title>multi-click selection extension test</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
  .testingDiv { font: 16px/1.25 monospace; width: -moz-fit-content; }
  p { margin: 0; unicode-bidi: bidi-override; }

  <div id="testDiv" class="testingDiv">
      <p>one two three</p>
      <p>un deux trois</p>
      <p>ein zwei drei</p>
  <div id="rtlTestDiv" class="testingDiv" dir="rtl">
      <p>one two three</p>
      <p>un deux trois</p>
      <p>ein zwei drei</p>

  <pre id="test">
  <script class="testbody" type="text/javascript">

  function test() {
    const testDiv = document.getElementById("testDiv");
    const rtlTestDiv = document.getElementById("rtlTestDiv");

    // Expected line height (CSS 'lh' unit), given that font-size = 16px and
    // line-height = 1.25.
    const lh = 20;

    // Width of one character in the monospace font (the CSS 'ch' unit),
    // calculated by measuring the test text that contains 13 chars per line.
    const ch = testDiv.offsetWidth / 13;

    const platformIsWindows = !navigator.platform.indexOf("Win");
    const eatSpaceAfterWord = SpecialPowers.getBoolPref("layout.word_select.eat_space_to_next_word");

    // Y-coordinates that will fall within each line:
    const firstLine = 0.5 * lh;
    const secondLine = 1.5 * lh;
    const thirdLine = 2.5 * lh;

    // Return the character offset of "^", representing the position to click/drag
    // within the test string.
    function xPosForClick(s) {
      return s.indexOf("^") * ch;

    // Test expectation strings use "_" to represent a space that is only expected
    // to be present on Windows, where layout.word_select.eat_space_to_next_word
    // is set by default, and <PAR> to denote a paragraph separator sequence (two
    // platform-specific newlines).
    function expectation(s) {
      let result = s.replace("_", eatSpaceAfterWord ? " " : "");
      result = result.replace("<PAR>", platformIsWindows ? "\r\n\r\n" : "\n\n");
      return result;

    // Sanity-check that we're hitting what we expect with our clicks:
    synthesizeMouse(testDiv, xPosForClick("un de^ux trois"), secondLine, { clickCount: 2 });
    is(window.getSelection().toString(), expectation("deux_"), "Double-click middle word");

    // Each entry in the array specifies which line to drag to, the character position
    // within that line (indicated by the caret ^ in the given string), and what the
    // expected selection should then be.
    const wordSelectTests = [
      [secondLine, "un^ deux trois", "un deux_", "Drag left to extend by word"],
      [secondLine, "un ^deux trois", "deux_", "Return to edge of anchor word"],
      [secondLine, "un d^eux trois", "deux_", "Return to within anchor word"],
      [secondLine, "un deux t^rois", "deux trois", "Drag right to extend by word"],
      [firstLine, "one t^wo three", "two three<PAR>un deux_", "Drag into previous line"],
      [secondLine, "un ^deux trois", "deux_", "Drag back to start of anchor word"],
      [secondLine, "un de^ux trois", "deux_", "Drag back to middle of anchor word"],
      [thirdLine, "ein zw^ei drei", "deux trois<PAR>ein zwei_", "Drag into next line"],
      [secondLine, "un de^ux trois", "deux_", "Return to anchor word"],

    const lineSelectTests = [
      [secondLine, "un de^ux trois", "un deux trois", "Triple-click selected whole line"],
      [firstLine, "one t^wo three", "one two three<PAR>un deux trois", "Drag up into previous line"],
      [secondLine, "un de^ux trois", "un deux trois", "Return to middle line"],
      [thirdLine, "ein z^wei drei", "un deux trois<PAR>ein zwei drei", "Drag down into next line"],
      [secondLine, "un de^ux trois", "un deux trois", "Return to middle line"],

    // The RTL tests use monospaced latin text with bidi-override applied;
    // we specify caret positions by counting characters in a reversed string.
    const rtlWordSelectTests = [
      [secondLine, "siort xued ^nu", "un deux_", "Drag right to extend by word"],
      [secondLine, "siort xued^ nu", "deux_", "Return to edge of anchor word"],
      [secondLine, "siort xu^ed nu", "deux_", "Return to within anchor word"],
      [secondLine, "siort^ xued nu", "deux trois", "Drag left to extend by word"],
      [firstLine, "eerht ow^t eno", "two three<PAR>un deux_", "Drag into previous line"],
      [secondLine, "siort xued^ nu", "deux_", "Drag back to start of anchor word"],
      [secondLine, "siort xu^ed nu", "deux_", "Drag back to middle of anchor word"],
      [thirdLine, "ierd ie^wz nie", "deux trois<PAR>ein zwei_", "Drag into next line"],
      [secondLine, "siort xu^ed nu", "deux_", "Return to anchor word"],

    function testMultiClickAndDrag(elem, initialPos, clickCount, tests) {
      // Initial multi-click in the middle word of the middle line:
      synthesizeMouse(elem, xPosForClick(initialPos), secondLine, { type: "mousedown", clickCount: clickCount });

      // Now drag to each test position and check the resulting selection:
      tests.forEach(function(t) {
        synthesizeMouse(elem, xPosForClick(t[1]), t[0], { type: "mousemove" });
        is(window.getSelection().toString(), expectation(t[2]), t[3]);

      // Finish the test sequence with mouseUp.
      synthesizeMouse(elem, xPosForClick(initialPos), secondLine, { type: "mouseup" });

    testMultiClickAndDrag(testDiv, "un de^ux trois", 2, wordSelectTests);

    testMultiClickAndDrag(testDiv, "un de^ux trois", 3, lineSelectTests);

    testMultiClickAndDrag(rtlTestDiv, "siort xu^ed nu", 2, rtlWordSelectTests);

  window.onload = function() {
    setTimeout(test, 0);