void
ScrollbarActivity::ActivityStopped()
{
NS_ASSERTION(IsActivityOngoing(), "activity stopped while none was going on");
NS_ASSERTION(mIsActive, "need to be active during activity");
NS_ASSERTION(!mIsFading, "must not be fading during ongoing activity");
mNestedActivityCounter--;
if (!IsActivityOngoing()) {
StartFadeBeginTimer();
NS_ASSERTION(mIsActive, "need to be active right after activity");
NS_ASSERTION(!mIsFading, "must not be fading right after activity");
}
}
void
ScrollbarActivity::ActivityStopped()
{
if (!IsActivityOngoing()) {
// This can happen if there was a frame reconstruction while the activity
// was ongoing. In this case we just do nothing. We should probably handle
// this case better.
return;
}
NS_ASSERTION(mIsActive, "need to be active during activity");
NS_ASSERTION(!mIsFading, "must not be fading during ongoing activity");
mNestedActivityCounter--;
if (!IsActivityOngoing()) {
StartFadeBeginTimer();
NS_ASSERTION(mIsActive, "need to be active right after activity");
NS_ASSERTION(!mIsFading, "must not be fading right after activity");
}
}
void
ScrollbarActivity::WillRefresh(TimeStamp aTime)
{
NS_ASSERTION(mIsActive, "should only fade while scrollbars are visible");
NS_ASSERTION(!IsActivityOngoing(), "why weren't we unregistered from the refresh driver when scrollbar activity started?");
NS_ASSERTION(mIsFading, "should only animate fading during fade");
if (!UpdateOpacity(aTime)) {
return;
}
if (!IsStillFading(aTime)) {
EndFade();
}
}
void
ScrollbarActivity::BeginFade()
{
NS_ASSERTION(mIsActive, "can't begin fade when we're already inactive");
NS_ASSERTION(!IsActivityOngoing(), "why wasn't the fade begin timer cancelled when scrollbar activity started?");
NS_ASSERTION(!mIsFading, "shouldn't be fading just yet");
CancelFadeBeginTimer();
mFadeBeginTime = TimeStamp::Now();
if (!SetIsFading(true)) {
return;
}
RegisterWithRefreshDriver();
NS_ASSERTION(mIsActive, "only fade while scrollbars are visible");
NS_ASSERTION(mIsFading, "should be fading now");
}
void
ScrollbarActivity::EndFade()
{
NS_ASSERTION(mIsActive, "still need to be active at this point");
NS_ASSERTION(!IsActivityOngoing(), "why wasn't the fade end timer cancelled when scrollbar activity started?");
if (!SetIsFading(false)) {
return;
}
SetIsActive(false);
UnregisterFromRefreshDriver();
StopListeningForScrollbarEvents();
if (!mDisplayOnMouseMove) {
StopListeningForScrollAreaEvents();
}
NS_ASSERTION(!mIsActive, "should have gone inactive after fade end");
NS_ASSERTION(!mIsFading, "shouldn't be fading anymore");
}