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// Copyright 2015 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.
module device.mojom;
enum WakeLockType {
// Prevent the application from being suspended. On some platforms, apps may
// be suspended when they are not visible to the user. This type of block
// requests that the app continue to run in that case, and on all platforms
// prevents the system from sleeping.
// Example use cases: downloading a file, playing audio.
kPreventAppSuspension = 0,
// Prevent the display from going to sleep. This also has the side effect of
// preventing the system from sleeping, but does not necessarily prevent the
// app from being suspended on some platforms if the user hides it.
// Example use case: playing video.
kPreventDisplaySleep = 1,
// Like kPreventDisplaySleep, but permits the display to dim while remaining
// on. On some platforms, this may be treated identically to
// PreventDisplaySleep.
kPreventDisplaySleepAllowDimming = 2,
enum WakeLockReason {
// Audio is being played.
kAudioPlayback = 0,
// Video is being played.
kVideoPlayback = 1,
// WakeLock for some other reason.
kOther = 2,
// WakeLock receives wake lock preferences from its client.
interface WakeLock {
// Requests that a wake lock be applied on behalf of this client. Has no
// effect if the client has previously called this method without
// subsequently calling CancelWakeLock().
// Cancels all outstanding wake lock requests from this client. If there are
// no more outstanding requests from any clients, the active wake lock (if
// there is one) will be turned off.
// Adds a client to this WakeLock instance. Clients are grouped on a
// per-WakeLock instance basis: that is, a given WakeLock instance turns
// on its wake lock whenever *any* of its clients make a request to do so
// and turns off its wake lock only when *all* its clients that had
// previously called RequestWakelock() cancel their requests.
AddClient(WakeLock& wake_lock);
// Change the wake lock type. Has no effect if the current wakelock is shared
// by more than one client (by AddClient()). Has no effect on Android.
// If the wake lock is in "active" state (by RequestWakeLock()), it requests
// a wakelock with new type first before cancels the old one to ensure that
// there isn't a brief period where the old wake lock is cancelled while the
// new wake lock is not requested. If the wake lock is in "non-active" state,
// it only changes the type.
// Returns true if the wake lock type is successfully changed.
ChangeType(WakeLockType type) => (bool result);
// Test-only method that returns whether a wake lock is currently active.
HasWakeLockForTests() => (bool result);