helper_doubletap_zoom_nothing.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <meta name="viewport" content="width=2100"/>

  <title>Check that double tapping when zoomed out and there is nothing to zoom to zooms in</title>

  <script src="apz_test_native_event_utils.js"></script>

  <script src="apz_test_utils.js"></script>

  <script src="/tests/SimpleTest/paint_listener.js"></script>

  <script>

async function test() {

  let useTouchpad = (location.search == "?touchpad");

  let resolution = await getResolution();

  let initial_resolution = resolution;

  ok(resolution > 0,

     "The initial_resolution is " + resolution + ", which is some sane value");

  // Check that double-tapping once zooms in

  await doubleTapOn(document.getElementById("thebody"), 20, 20, useTouchpad);

  let prev_resolution = resolution;

  resolution = await getResolution();

  ok(resolution > prev_resolution, "The first double-tap has increased the resolution to " + resolution);

  // Check that double-tapping again on the same spot zooms out

  await doubleTapOn(document.getElementById("thebody"), 20, 20, useTouchpad);

  prev_resolution = resolution;

  resolution = await getResolution();

  ok(resolution < prev_resolution, "The second double-tap has decreased the resolution to " + resolution);

  ok(resolution == initial_resolution, "The second double-tap has decreased the resolution to the start resolution " + resolution);

waitUntilApzStable()

.then(test)

.then(subtestDone, subtestFailed);

  </script>

<style>

  body, html {margin: 0; width: 100%; height: 100%;}

</style>

</head>

<body id="thebody">

</body>

</html>