| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Code shared by some of the visibility tests. Maintains a list of |
| // visibility states, starting with the state when this file was loaded. |
| // New states are added on each visibility change event. |
| |
| // Array of previously observed visibility states. |
| var visibilityStates = [document.visibilityState]; |
| |
| // Array of previously observed hidden values. |
| var hiddenValues = [document.hidden]; |
| |
| // Record all visibility changes in corresponding arrays. |
| function onVisibilityChange(event) { |
| visibilityStates.push(document.visibilityState); |
| hiddenValues.push(document.hidden); |
| } |
| |
| document.addEventListener("visibilitychange", |
| onVisibilityChange, |
| false); |
| |
