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Bug 968603 - Add screen WakeLockListener on Win32 to disable screensaver. r=jimm

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This commit is contained in:
Chris Pearce 2014-02-07 13:27:46 +13:00
parent 96eeaae8c7
commit bf1b87491f
1 changed files with 57 additions and 3 deletions
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60
widget/windows/nsAppShell.cpp
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@ -15,10 +15,59 @@
#include "WinIMEHandler.h"
#include "mozilla/widget/AudioSession.h"
#include "mozilla/HangMonitor.h"
#include "nsIDOMWakeLockListener.h"
#include "nsIPowerManagerService.h"
#include "mozilla/StaticPtr.h"
using namespace mozilla;
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 WinWakeLockListener : public nsIDOMMozWakeLockListener {
public:
NS_DECL_ISUPPORTS;
private:
NS_IMETHOD Callback(const nsAString& aTopic, const nsAString& aState) {
if (aState.Equals(NS_LITERAL_STRING("locked-foreground"))) {
// Prevent screen saver.
SetThreadExecutionState(ES_DISPLAY_REQUIRED|ES_CONTINUOUS);
} else {
// Re-enable screen saver.
SetThreadExecutionState(ES_CONTINUOUS);
}
return NS_OK;
}
};
NS_IMPL_ISUPPORTS1(WinWakeLockListener, nsIDOMMozWakeLockListener)
StaticRefPtr<WinWakeLockListener> sWakeLockListener;
static void
AddScreenWakeLockListener()
{
nsCOMPtr<nsIPowerManagerService> sPowerManagerService = do_GetService(POWERMANAGERSERVICE_CONTRACTID);
if (sPowerManagerService) {
sWakeLockListener = new WinWakeLockListener();
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;
}
}
namespace mozilla {
namespace widget {
// Native event callback message.
@ -102,7 +151,6 @@ nsAppShell::Init()
return nsBaseAppShell::Init();
}
NS_IMETHODIMP
nsAppShell::Run(void)
{
@ -110,8 +158,14 @@ nsAppShell::Run(void)
// appropriate response to failing to start an audio session.
mozilla::widget::StartAudioSession();
// Add an observer that disables the screen saver when requested by Gecko.
// For example when we're playing video in the foreground tab.
AddScreenWakeLockListener();
nsresult rv = nsBaseAppShell::Run();
RemoveScreenWakeLockListener();
mozilla::widget::StopAudioSession();
return rv;
@ -142,7 +196,7 @@ nsAppShell::DoProcessMoreGeckoEvents()
// always be true. ScheduleNativeEventCallback will be called on every
// NativeEventCallback callback, and in a Windows modal dispatch loop, the
// callback message will be processed first -> input gets starved, dead lock.
// To avoid, don't post native callback messages from NativeEventCallback
// when we're in a modal loop. This gets us back into the Windows modal
// dispatch loop dispatching input messages. Once we drop out of the modal
@ -251,6 +305,6 @@ nsAppShell::ProcessNextNativeEvent(bool mayWait)
if (timeSinceLastNativeEventScheduled > nativeEventStarvationLimit) {
ScheduleNativeEventCallback();
}
return gotMessage;
}