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Bug 772347 - Add WakeLockListener on MacOSX. r=smichaud

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Disables the screensaver on Mac while a video is playing.
This commit is contained in:
Lucas GOLVEN 2014-06-13 19:58:00 +02:00
parent f8afe7d2c5
commit 20e8e3b169
1 changed files with 93 additions and 0 deletions
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93
widget/cocoa/nsAppShell.mm
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@ -36,9 +36,70 @@
#include "pratom.h"
#include "npapi.h"
#include <IOKit/pwr_mgt/IOPMLib.h>
#include "nsIDOMWakeLockListener.h"
#include "nsIPowerManagerService.h"
using namespace mozilla::widget;
// A wake lock listener that disables screen saver when requested by
// Gecko. For example when we're playing video in a foreground tab we
// don't want the screen saver to turn on.
class MacWakeLockListener : public nsIDOMMozWakeLockListener {
public:
NS_DECL_ISUPPORTS;
private:
IOPMAssertionID mAssertionID = kIOPMNullAssertionID;
NS_IMETHOD Callback(const nsAString& aTopic, const nsAString& aState) {
bool isLocked = mLockedTopics.Contains(aTopic);
bool shouldLock = aState.EqualsLiteral("locked-foreground");
if (isLocked == shouldLock) {
return NS_OK;
}
if (shouldLock) {
if (!mLockedTopics.Count()) {
// This is the first topic to request the screen saver be disabled.
// Prevent screen saver.
CFStringRef cf_topic =
::CFStringCreateWithCharacters(kCFAllocatorDefault,
reinterpret_cast<const UniChar*>
(aTopic.Data()),
aTopic.Length());
IOReturn success =
::IOPMAssertionCreateWithName(kIOPMAssertionTypeNoDisplaySleep,
kIOPMAssertionLevelOn,
cf_topic,
&mAssertionID);
CFRelease(cf_topic);
if (success != kIOReturnSuccess) {
NS_WARNING("fail to disable screensaver");
}
}
mLockedTopics.PutEntry(aTopic);
} else {
mLockedTopics.RemoveEntry(aTopic);
if (!mLockedTopics.Count()) {
// No other outstanding topics have requested screen saver be disabled.
// Re-enable screen saver.
if (mAssertionID != kIOPMNullAssertionID) {
IOReturn result = ::IOPMAssertionRelease(mAssertionID);
if (result != kIOReturnSuccess) {
NS_WARNING("fail to release screensaver");
}
}
}
}
return NS_OK;
}
// Keep track of all the topics that have requested a wake lock. When the
// number of topics in the hashtable reaches zero, we can uninhibit the
// screensaver again.
nsTHashtable<nsStringHashKey> mLockedTopics;
};
// defined in nsCocoaWindow.mm
extern int32_t gXULModalLevel;
@ -144,6 +205,33 @@ nsAppShell::~nsAppShell()
NS_OBJC_END_TRY_ABORT_BLOCK
}
NS_IMPL_ISUPPORTS(MacWakeLockListener, nsIDOMMozWakeLockListener)
StaticRefPtr<MacWakeLockListener> sWakeLockListener;
static void
AddScreenWakeLockListener()
{
nsCOMPtr<nsIPowerManagerService> sPowerManagerService = do_GetService(
POWERMANAGERSERVICE_CONTRACTID);
if (sPowerManagerService) {
sWakeLockListener = new MacWakeLockListener();
sPowerManagerService->AddWakeLockListener(sWakeLockListener);
} else {
NS_WARNING("Failed to retrieve PowerManagerService, wakelocks will be broken!");
}
}
static void
RemoveScreenWakeLockListener()
{
nsCOMPtr<nsIPowerManagerService> sPowerManagerService = do_GetService(
POWERMANAGERSERVICE_CONTRACTID);
if (sPowerManagerService) {
sPowerManagerService->RemoveWakeLockListener(sWakeLockListener);
sPowerManagerService = nullptr;
sWakeLockListener = nullptr;
}
}
// Init
//
// Loads the nib (see bug 316076c21) and sets up the CFRunLoopSource used to
@ -552,8 +640,13 @@ nsAppShell::Run(void)
return NS_OK;
mStarted = true;
AddScreenWakeLockListener();
NS_OBJC_TRY_ABORT([NSApp run]);
RemoveScreenWakeLockListener();
return NS_OK;
}