third_party/WebKit/LayoutTests/fast/events/page-visibility-transition-test.html

   1 <html>
   2 <body onload='startTest()'>
   3
   4 <script src="../../resources/js-test.js"></script>
   5
   6 <script>
   7
   8 description("This test checks that Page Visibility state values are correct and the event changes are fired correctly.");
   9
  10 var jsTestIsAsync = true;
  11
  12 function makePageVisible() {
  13     if (window.testRunner)
  14         testRunner.setPageVisibility("visible");
  15 }
  16
  17 function makePageHidden() {
  18     if (window.testRunner)
  19         testRunner.setPageVisibility("hidden");
  20 }
  21
  22 function makePagePrerender() {
  23     if (window.testRunner)
  24         testRunner.setPageVisibility("prerender");
  25 }
  26
  27 function checkIsPageVisible() {
  28     shouldBeEqualToString("document.visibilityState", "visible");
  29     shouldBeFalse("document.hidden");
  30 }
  31
  32 function checkIsPageHidden() {
  33     shouldBeEqualToString("document.visibilityState", "hidden");
  34     shouldBeTrue("document.hidden");
  35 }
  36
  37 function checkIsPagePrerendering() {
  38     shouldBeEqualToString("document.visibilityState", "prerender");
  39     shouldBeTrue("document.hidden");
  40 }
  41
  42 // We will try to change the visibility states as:
  43 //  0 - visible. (Initial - i.e. on load).
  44 //  1 - hidden (should fire event).
  45 //  2 - hidden (no event).
  46 //  3 - prerender (should fire event).
  47 //  4 - visible (should fire event).
  48 var numVisibilityChanges = 0;
  49
  50 function startTest() {
  51     document.addEventListener(
  52         "visibilitychange", onVisibilityChange, false);
  53     checkIsPageVisible();
  54     numVisibilityChanges++;
  55     makePageHidden();
  56 }
  57
  58 function onVisibilityChange() {
  59     if (numVisibilityChanges == 1) {
  60         checkIsPageHidden();
  61         numVisibilityChanges++;
  62         makePageHidden();
  63         checkIsPageHidden();
  64         numVisibilityChanges++;
  65         makePagePrerender();
  66         return;
  67     } else if (numVisibilityChanges == 2) {
  68         testFailed("Invalid event fired on same state change.");
  69         finishJSTest();
  70         return;
  71     } else if (numVisibilityChanges == 3) {
  72         checkIsPagePrerendering();
  73         numVisibilityChanges++;
  74         makePageVisible();
  75         return;
  76     } else if (numVisibilityChanges == 4) {
  77         checkIsPageVisible();
  78         numVisibilityChanges++;
  79         finishJSTest();
  80         return;
  81     } else {
  82         testFailed("Too many visibility transitions");
  83         finishJSTest();
  84         return;
  85     }
  86 }
  87
  88 </script>
  89
  90
  91 </body>
  92 </html>