NS_IMETHODIMP
ScrollbarActivity::HandleEvent(nsIDOMEvent* aEvent)
{
if (!mDisplayOnMouseMove && !mIsActive)
return NS_OK;
nsAutoString type;
aEvent->GetType(type);
if (type.EqualsLiteral("mousemove")) {
// Mouse motions anywhere in the scrollable frame should keep the
// scrollbars visible.
ActivityOccurred();
return NS_OK;
}
nsCOMPtr<nsIDOMEventTarget> target;
aEvent->GetOriginalTarget(getter_AddRefs(target));
nsCOMPtr<nsIContent> targetContent = do_QueryInterface(target);
HandleEventForScrollbar(type, targetContent, GetHorizontalScrollbar(),
&mHScrollbarHovered);
HandleEventForScrollbar(type, targetContent, GetVerticalScrollbar(),
&mVScrollbarHovered);
return NS_OK;
}
void
ScrollbarActivity::HoveredScrollbar(nsIContent* aScrollbar)
{
SetBooleanAttribute(GetHorizontalScrollbar(), nsGkAtoms::hover, false);
SetBooleanAttribute(GetVerticalScrollbar(), nsGkAtoms::hover, false);
SetBooleanAttribute(aScrollbar, nsGkAtoms::hover, true);
}
void
ScrollbarActivity::StartListeningForScrollbarEvents()
{
if (mListeningForScrollbarEvents)
return;
mHorizontalScrollbar = do_QueryInterface(GetHorizontalScrollbar());
mVerticalScrollbar = do_QueryInterface(GetVerticalScrollbar());
AddScrollbarEventListeners(mHorizontalScrollbar);
AddScrollbarEventListeners(mVerticalScrollbar);
mListeningForScrollbarEvents = true;
}
void
ScrollbarActivity::SetIsActive(bool aNewActive)
{
if (mIsActive == aNewActive)
return;
mIsActive = aNewActive;
if (!mIsActive) {
// Clear sticky scrollbar hover status.
HoveredScrollbar(nullptr);
}
SetBooleanAttribute(GetHorizontalScrollbar(), nsGkAtoms::active, mIsActive);
SetBooleanAttribute(GetVerticalScrollbar(), nsGkAtoms::active, mIsActive);
}
bool
ScrollbarActivity::UpdateOpacity(TimeStamp aTime)
{
double progress = (aTime - mFadeBeginTime) / FadeDuration();
double opacity = 1.0 - std::max(0.0, std::min(1.0, progress));
// 'this' may be getting destroyed during SetOpacityOnElement calls.
nsWeakFrame weakFrame((do_QueryFrame(mScrollableFrame)));
SetOpacityOnElement(GetHorizontalScrollbar(), opacity);
if (!weakFrame.IsAlive()) {
return false;
}
SetOpacityOnElement(GetVerticalScrollbar(), opacity);
if (!weakFrame.IsAlive()) {
return false;
}
return true;
}
bool
ScrollbarActivity::SetIsFading(bool aNewFading)
{
if (mIsFading == aNewFading)
return true;
mIsFading = aNewFading;
if (!mIsFading) {
mFadeBeginTime = TimeStamp();
// 'this' may be getting destroyed during UnsetOpacityOnElement calls.
nsWeakFrame weakFrame((do_QueryFrame(mScrollableFrame)));
UnsetOpacityOnElement(GetHorizontalScrollbar());
if (!weakFrame.IsAlive()) {
return false;
}
UnsetOpacityOnElement(GetVerticalScrollbar());
if (!weakFrame.IsAlive()) {
return false;
}
}
return true;
}
bool
ScrollbarActivity::UpdateOpacity(TimeStamp aTime)
{
// Avoid division by zero if mScrollbarFadeDuration is zero, just jump
// to the end of the fade animation
double progress = mScrollbarFadeDuration
? ((aTime - mFadeBeginTime) / FadeDuration())
: 1.0;
double opacity = 1.0 - std::max(0.0, std::min(1.0, progress));
// 'this' may be getting destroyed during SetOpacityOnElement calls.
nsWeakFrame weakFrame((do_QueryFrame(mScrollableFrame)));
SetOpacityOnElement(GetHorizontalScrollbar(), opacity);
if (!weakFrame.IsAlive()) {
return false;
}
SetOpacityOnElement(GetVerticalScrollbar(), opacity);
if (!weakFrame.IsAlive()) {
return false;
}
return true;
}
