void ScrollingTree::setOrClearLatchedNode(const PlatformWheelEvent& wheelEvent, ScrollingNodeID nodeID)
{
if (wheelEvent.shouldConsiderLatching())
setLatchedNode(nodeID);
else if (wheelEvent.shouldResetLatching())
clearLatchedNode();
}
bool ScrollingTree::shouldHandleWheelEventSynchronously(const PlatformWheelEvent& wheelEvent)
{
// This method is invoked by the event handling thread
MutexLocker lock(m_mutex);
if (m_hasWheelEventHandlers)
return true;
bool shouldSetLatch = wheelEvent.shouldConsiderLatching();
if (hasLatchedNode() && !shouldSetLatch)
return false;
if (shouldSetLatch)
m_latchedNode = 0;
if (!m_nonFastScrollableRegion.isEmpty()) {
// FIXME: This is not correct for non-default scroll origins.
FloatPoint position = wheelEvent.position();
position.moveBy(m_mainFrameScrollPosition);
if (m_nonFastScrollableRegion.contains(roundedIntPoint(position)))
return true;
}
return false;
}
void EventDispatcher::wheelEvent(uint64_t pageID, const WebWheelEvent& wheelEvent, bool canGoBack, bool canGoForward)
{
#if ENABLE(THREADED_SCROLLING)
MutexLocker locker(m_scrollingTreesMutex);
if (ScrollingTree* scrollingTree = m_scrollingTrees.get(pageID)) {
PlatformWheelEvent platformWheelEvent = platform(wheelEvent);
// FIXME: It's pretty horrible that we're updating the back/forward state here.
// WebCore should always know the current state and know when it changes so the
// scrolling tree can be notified.
// We only need to do this at the beginning of the gesture.
if (platformWheelEvent.phase() == PlatformWheelEventPhaseBegan)
ScrollingThread::dispatch(bind(&ScrollingTree::updateBackForwardState, scrollingTree, canGoBack, canGoForward));
ScrollingTree::EventResult result = scrollingTree->tryToHandleWheelEvent(platformWheelEvent);
if (result == ScrollingTree::DidHandleEvent || result == ScrollingTree::DidNotHandleEvent) {
sendDidReceiveEvent(pageID, wheelEvent, result == ScrollingTree::DidHandleEvent);
return;
}
}
#else
UNUSED_PARAM(canGoBack);
UNUSED_PARAM(canGoForward);
#endif
RunLoop::main()->dispatch(bind(&EventDispatcher::dispatchWheelEvent, this, pageID, wheelEvent));
}
void ScrollAnimator::handleWheelEvent(PlatformWheelEvent& e)
{
Scrollbar* horizontalScrollbar = m_scrollableArea->horizontalScrollbar();
Scrollbar* verticalScrollbar = m_scrollableArea->verticalScrollbar();
// Accept the event if we have a scrollbar in that direction and can still
// scroll any further.
float deltaX = horizontalScrollbar ? e.deltaX() : 0;
float deltaY = verticalScrollbar ? e.deltaY() : 0;
IntSize maxForwardScrollDelta = m_scrollableArea->maximumScrollPosition() - m_scrollableArea->scrollPosition();
IntSize maxBackwardScrollDelta = m_scrollableArea->scrollPosition() - m_scrollableArea->minimumScrollPosition();
if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
|| (deltaX > 0 && maxBackwardScrollDelta.width() > 0)
|| (deltaY < 0 && maxForwardScrollDelta.height() > 0)
|| (deltaY > 0 && maxBackwardScrollDelta.height() > 0)) {
e.accept();
if (e.granularity() == ScrollByPageWheelEvent) {
ASSERT(!e.deltaX());
bool negative = deltaY < 0;
deltaY = max(max(static_cast<float>(m_scrollableArea->visibleHeight()) * Scrollbar::minFractionToStepWhenPaging(), static_cast<float>(m_scrollableArea->visibleHeight() - Scrollbar::maxOverlapBetweenPages())), 1.0f);
if (negative)
deltaY = -deltaY;
}
if (deltaY)
scroll(VerticalScrollbar, ScrollByPixel, verticalScrollbar->pixelStep(), -deltaY);
if (deltaX)
scroll(HorizontalScrollbar, ScrollByPixel, horizontalScrollbar->pixelStep(), -deltaX);
}
}
void ScrollView::wheelEvent(PlatformWheelEvent& e)
{
// We don't allow mouse wheeling to happen in a ScrollView that has had its scrollbars explicitly disabled.
#if PLATFORM(WX)
if (!canHaveScrollbars()) {
#else
if (!canHaveScrollbars() || platformWidget()) {
#endif
return;
}
// Accept the event if we have a scrollbar in that direction and can still
// scroll any further.
float deltaX = m_horizontalScrollbar ? e.deltaX() : 0;
float deltaY = m_verticalScrollbar ? e.deltaY() : 0;
IntSize maxForwardScrollDelta = maximumScrollPosition() - scrollPosition();
IntSize maxBackwardScrollDelta = scrollPosition() - minimumScrollPosition();
if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
|| (deltaX > 0 && maxBackwardScrollDelta.width() >0)
|| (deltaY < 0 && maxForwardScrollDelta.height() > 0)
|| (deltaY > 0 && maxBackwardScrollDelta.height() > 0)) {
e.accept();
if (e.granularity() == ScrollByPageWheelEvent) {
ASSERT(!e.deltaX());
bool negative = deltaY < 0;
deltaY = max(max(static_cast<float>(visibleHeight()) * Scrollbar::minFractionToStepWhenPaging(), static_cast<float>(visibleHeight() - Scrollbar::maxOverlapBetweenPages())), 1.0f);
if (negative)
deltaY = -deltaY;
}
if (deltaY)
m_verticalScrollbar->scroll(ScrollUp, ScrollByPixel, deltaY);
if (deltaX)
m_horizontalScrollbar->scroll(ScrollLeft, ScrollByPixel, deltaX);
}
}
void ScrollView::setFrameRect(const IntRect& newRect)
{
IntRect oldRect = frameRect();
if (newRect == oldRect)
return;
Widget::setFrameRect(newRect);
if (platformWidget())
return;
if (newRect.width() != oldRect.width() || newRect.height() != oldRect.height()) {
updateScrollbars(m_scrollOffset);
if (!m_useFixedLayout)
contentsResized();
}
frameRectsChanged();
}
bool ScrollAnimator::handleWheelEvent(const PlatformWheelEvent& e)
{
#if ENABLE(CSS_SCROLL_SNAP) && PLATFORM(MAC)
if (!m_scrollController.processWheelEventForScrollSnap(e))
return false;
#endif
#if PLATFORM(COCOA)
// Events in the PlatformWheelEventPhaseMayBegin phase have no deltas, and therefore never passes through the scroll handling logic below.
// This causes us to return with an 'unhandled' return state, even though this event was successfully processed.
//
// We receive at least one PlatformWheelEventPhaseMayBegin when starting main-thread scrolling (see FrameView::wheelEvent), which can
// fool the scrolling thread into attempting to handle the scroll, unless we treat the event as handled here.
if (e.phase() == PlatformWheelEventPhaseMayBegin)
return true;
#endif
Scrollbar* horizontalScrollbar = m_scrollableArea.horizontalScrollbar();
Scrollbar* verticalScrollbar = m_scrollableArea.verticalScrollbar();
// Accept the event if we have a scrollbar in that direction and can still
// scroll any further.
float deltaX = horizontalScrollbar ? e.deltaX() : 0;
float deltaY = verticalScrollbar ? e.deltaY() : 0;
bool handled = false;
ScrollGranularity granularity = ScrollByPixel;
IntSize maxForwardScrollDelta = m_scrollableArea.maximumScrollPosition() - m_scrollableArea.scrollPosition();
IntSize maxBackwardScrollDelta = m_scrollableArea.scrollPosition() - m_scrollableArea.minimumScrollPosition();
if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
|| (deltaX > 0 && maxBackwardScrollDelta.width() > 0)
|| (deltaY < 0 && maxForwardScrollDelta.height() > 0)
|| (deltaY > 0 && maxBackwardScrollDelta.height() > 0)) {
handled = true;
if (deltaY) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaY < 0;
deltaY = Scrollbar::pageStepDelta(m_scrollableArea.visibleHeight());
if (negative)
deltaY = -deltaY;
}
scroll(VerticalScrollbar, granularity, verticalScrollbar->pixelStep(), -deltaY);
}
if (deltaX) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaX < 0;
deltaX = Scrollbar::pageStepDelta(m_scrollableArea.visibleWidth());
if (negative)
deltaX = -deltaX;
}
scroll(HorizontalScrollbar, granularity, horizontalScrollbar->pixelStep(), -deltaX);
}
}
return handled;
}
WheelEventDispatchMediator::WheelEventDispatchMediator(const PlatformWheelEvent& event, PassRefPtr<AbstractView> view)
{
if (!(event.deltaX() || event.deltaY()))
return;
setEvent(WheelEvent::create(FloatPoint(event.wheelTicksX(), event.wheelTicksY()), FloatPoint(event.deltaX(), event.deltaY()),
granularity(event), view, IntPoint(event.globalX(), event.globalY()), IntPoint(event.x(), event.y()),
event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), event.webkitDirectionInvertedFromDevice()));
}
static PlatformWheelEvent constructRelativeWheelEvent(const PlatformWheelEvent& e, FramelessScrollView* parent, FramelessScrollView* child)
{
IntPoint pos = parent->convertSelfToChild(child, e.position());
// FIXME: This is a horrible hack since PlatformWheelEvent has no setters for x/y.
PlatformWheelEvent relativeEvent = e;
IntPoint& relativePos = const_cast<IntPoint&>(relativeEvent.position());
relativePos.setX(pos.x());
relativePos.setY(pos.y());
return relativeEvent;
}
void ScrollView::wheelEvent(PlatformWheelEvent& e)
{
// Determine how much we want to scroll. If we can move at all, we will accept the event.
IntSize maxScrollDelta = maximumScroll();
if ((e.deltaX() < 0 && maxScrollDelta.width() > 0) ||
(e.deltaX() > 0 && scrollOffset().width() > 0) ||
(e.deltaY() < 0 && maxScrollDelta.height() > 0) ||
(e.deltaY() > 0 && scrollOffset().height() > 0)) {
e.accept();
scrollBy(-e.deltaX() * LINE_STEP, -e.deltaY() * LINE_STEP);
}
}
WheelEvent::WheelEvent(const PlatformWheelEvent& event, DOMWindow* view)
: MouseEvent(eventNames().wheelEvent, true, true, event.timestamp(), view, 0, event.globalPosition(), event.position()
#if ENABLE(POINTER_LOCK)
, { }
#endif
, event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), 0, 0, 0, 0, 0, false)
, m_wheelDelta(event.wheelTicksX() * TickMultiplier, event.wheelTicksY() * TickMultiplier)
, m_deltaX(-event.deltaX())
, m_deltaY(-event.deltaY())
, m_deltaMode(determineDeltaMode(event))
, m_wheelEvent(event)
, m_initializedWithPlatformWheelEvent(true)
{
}
bool ScrollAnimator::handleWheelEvent(const PlatformWheelEvent& e)
{
bool canScrollX = m_scrollableArea->userInputScrollable(HorizontalScrollbar);
bool canScrollY = m_scrollableArea->userInputScrollable(VerticalScrollbar);
// Accept the event if we are scrollable in that direction and can still
// scroll any further.
float deltaX = canScrollX ? e.deltaX() : 0;
float deltaY = canScrollY ? e.deltaY() : 0;
bool handled = false;
#if !OS(MACOSX)
ScrollGranularity granularity = e.hasPreciseScrollingDeltas() ? ScrollByPrecisePixel : ScrollByPixel;
#else
ScrollGranularity granularity = ScrollByPixel;
#endif
IntSize maxForwardScrollDelta = m_scrollableArea->maximumScrollPosition() - m_scrollableArea->scrollPosition();
IntSize maxBackwardScrollDelta = m_scrollableArea->scrollPosition() - m_scrollableArea->minimumScrollPosition();
if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
|| (deltaX > 0 && maxBackwardScrollDelta.width() > 0)
|| (deltaY < 0 && maxForwardScrollDelta.height() > 0)
|| (deltaY > 0 && maxBackwardScrollDelta.height() > 0)) {
handled = true;
if (deltaY) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaY < 0;
deltaY = m_scrollableArea->pageStep(VerticalScrollbar);
if (negative)
deltaY = -deltaY;
}
scroll(VerticalScrollbar, granularity, m_scrollableArea->pixelStep(VerticalScrollbar), -deltaY);
}
if (deltaX) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaX < 0;
deltaX = m_scrollableArea->pageStep(HorizontalScrollbar);
if (negative)
deltaX = -deltaX;
}
scroll(HorizontalScrollbar, granularity, m_scrollableArea->pixelStep(HorizontalScrollbar), -deltaX);
}
}
return handled;
}
bool ScrollAnimator::handleWheelEvent(const PlatformWheelEvent& e)
{
Scrollbar* horizontalScrollbar = m_scrollableArea->horizontalScrollbar();
Scrollbar* verticalScrollbar = m_scrollableArea->verticalScrollbar();
// Accept the event if we have a scrollbar in that direction and can still
// scroll any further.
float deltaX = horizontalScrollbar ? e.deltaX() : 0;
float deltaY = verticalScrollbar ? e.deltaY() : 0;
bool handled = false;
#if PLATFORM(CHROMIUM) && !OS(DARWIN)
ScrollGranularity granularity = e.hasPreciseScrollingDeltas() ? ScrollByPrecisePixel : ScrollByPixel;
#else
ScrollGranularity granularity = ScrollByPixel;
#endif
IntSize maxForwardScrollDelta = m_scrollableArea->maximumScrollPosition() - m_scrollableArea->scrollPosition();
IntSize maxBackwardScrollDelta = m_scrollableArea->scrollPosition() - m_scrollableArea->minimumScrollPosition();
if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
|| (deltaX > 0 && maxBackwardScrollDelta.width() > 0)
|| (deltaY < 0 && maxForwardScrollDelta.height() > 0)
|| (deltaY > 0 && maxBackwardScrollDelta.height() > 0)) {
handled = true;
if (deltaY) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaY < 0;
deltaY = max(max(static_cast<float>(m_scrollableArea->visibleHeight()) * Scrollbar::minFractionToStepWhenPaging(), static_cast<float>(m_scrollableArea->visibleHeight() - Scrollbar::maxOverlapBetweenPages())), 1.0f);
if (negative)
deltaY = -deltaY;
}
scroll(VerticalScrollbar, granularity, verticalScrollbar->pixelStep(), -deltaY);
}
if (deltaX) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaX < 0;
deltaX = max(max(static_cast<float>(m_scrollableArea->visibleWidth()) * Scrollbar::minFractionToStepWhenPaging(), static_cast<float>(m_scrollableArea->visibleWidth() - Scrollbar::maxOverlapBetweenPages())), 1.0f);
if (negative)
deltaX = -deltaX;
}
scroll(HorizontalScrollbar, granularity, horizontalScrollbar->pixelStep(), -deltaX);
}
}
return handled;
}
bool ScrollingTree::willWheelEventStartSwipeGesture(const PlatformWheelEvent& wheelEvent)
{
if (wheelEvent.phase() != PlatformWheelEventPhaseBegan)
return false;
if (!wheelEvent.deltaX())
return false;
MutexLocker lock(m_swipeStateMutex);
if (wheelEvent.deltaX() > 0 && m_mainFramePinnedToTheLeft && m_canGoBack)
return true;
if (wheelEvent.deltaX() < 0 && m_mainFramePinnedToTheRight && m_canGoForward)
return true;
return false;
}
// GTK+ must scroll horizontally if the mouse pointer is on top of the
// horizontal scrollbar while scrolling with the wheel; we need to
// add the deltas and ticks here so that this behavior is consistent
// for styled scrollbars.
bool EventHandler::shouldTurnVerticalTicksIntoHorizontal(const HitTestResult& result, const PlatformWheelEvent& event) const
{
FrameView* view = m_frame.view();
Scrollbar* scrollbar = view ? view->scrollbarAtPoint(event.position()) : nullptr;
if (!scrollbar)
scrollbar = result.scrollbar();
return scrollbar && scrollbar->orientation() == HorizontalScrollbar;
}
bool ScrollingTree::willWheelEventStartSwipeGesture(const PlatformWheelEvent& wheelEvent)
{
if (wheelEvent.phase() != PlatformWheelEventPhaseBegan)
return false;
MutexLocker lock(m_swipeStateMutex);
if (wheelEvent.deltaX() > 0 && m_mainFramePinnedToTheLeft && !m_rubberBandsAtLeft)
return true;
if (wheelEvent.deltaX() < 0 && m_mainFramePinnedToTheRight && !m_rubberBandsAtRight)
return true;
if (wheelEvent.deltaY() > 0 && m_mainFramePinnedToTheTop && !m_rubberBandsAtTop)
return true;
if (wheelEvent.deltaY() < 0 && m_mainFramePinnedToTheBottom && !m_rubberBandsAtBottom)
return true;
return false;
}
ScrollResult ScrollableArea::handleWheel(const PlatformWheelEvent& wheelEvent)
{
// Wheel events which do not scroll are used to trigger zooming.
if (!wheelEvent.canScroll())
return ScrollResult();
cancelProgrammaticScrollAnimation();
return scrollAnimator()->handleWheelEvent(wheelEvent);
}
bool ScrollableArea::handleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
// ctrl+wheel events are used to trigger zooming, not scrolling.
if (wheelEvent.modifiers() & PlatformEvent::CtrlKey)
return false;
cancelProgrammaticScrollAnimation();
return scrollAnimator()->handleWheelEvent(wheelEvent);
}
bool PopupListBox::handleWheelEvent(const PlatformWheelEvent& event)
{
if (!isPointInBounds(event.position())) {
abandon();
return true;
}
ScrollableArea::handleWheelEvent(event);
return true;
}
void ScrollView::wheelEvent(PlatformWheelEvent& e)
{
// We don't allow mouse wheeling to happen in a ScrollView that has had its scrollbars explicitly disabled.
#if PLATFORM(WX)
if (!canHaveScrollbars()) {
#else
if (!canHaveScrollbars() || platformWidget()) {
#endif
return;
}
// Determine how much we want to scroll. If we can move at all, we will accept the event.
IntSize maxScrollDelta = maximumScrollPosition() - scrollPosition();
if ((e.deltaX() < 0 && maxScrollDelta.width() > 0) ||
(e.deltaX() > 0 && scrollOffset().width() > 0) ||
(e.deltaY() < 0 && maxScrollDelta.height() > 0) ||
(e.deltaY() > 0 && scrollOffset().height() > 0)) {
e.accept();
float deltaX = e.deltaX();
float deltaY = e.deltaY();
if (e.granularity() == ScrollByPageWheelEvent) {
ASSERT(deltaX == 0);
bool negative = deltaY < 0;
deltaY = max(max(static_cast<float>(visibleHeight()) * Scrollbar::minFractionToStepWhenPaging(), static_cast<float>(visibleHeight() - Scrollbar::maxOverlapBetweenPages())), 1.0f);
if (negative)
deltaY = -deltaY;
}
// Should we fall back on scrollBy() if there is no scrollbar for a non-zero delta?
if (deltaY && m_verticalScrollbar)
m_verticalScrollbar->scroll(ScrollUp, ScrollByPixel, deltaY);
if (deltaX && m_horizontalScrollbar)
m_horizontalScrollbar->scroll(ScrollLeft, ScrollByPixel, deltaX);
}
}
void ScrollView::setFrameRect(const IntRect& newRect)
{
IntRect oldRect = frameRect();
if (newRect == oldRect)
return;
Widget::setFrameRect(newRect);
if (platformWidget())
return;
if (newRect.width() != oldRect.width() || newRect.height() != oldRect.height()) {
updateScrollbars(m_scrollOffset);
if (!m_useFixedLayout)
contentsResized();
}
frameRectsChanged();
}
void EventDispatcher::wheelEvent(uint64_t pageID, const WebWheelEvent& wheelEvent, bool canRubberBandAtLeft, bool canRubberBandAtRight, bool canRubberBandAtTop, bool canRubberBandAtBottom)
{
PlatformWheelEvent platformWheelEvent = platform(wheelEvent);
#if PLATFORM(COCOA)
switch (wheelEvent.phase()) {
case PlatformWheelEventPhaseBegan:
m_recentWheelEventDeltaTracker->beginTrackingDeltas();
break;
case PlatformWheelEventPhaseEnded:
m_recentWheelEventDeltaTracker->endTrackingDeltas();
break;
default:
break;
}
if (m_recentWheelEventDeltaTracker->isTrackingDeltas()) {
m_recentWheelEventDeltaTracker->recordWheelEventDelta(platformWheelEvent);
DominantScrollGestureDirection dominantDirection = DominantScrollGestureDirection::None;
dominantDirection = m_recentWheelEventDeltaTracker->dominantScrollGestureDirection();
// Workaround for scrolling issues <rdar://problem/14758615>.
if (dominantDirection == DominantScrollGestureDirection::Vertical && platformWheelEvent.deltaX())
platformWheelEvent = platformWheelEvent.copyIgnoringHorizontalDelta();
else if (dominantDirection == DominantScrollGestureDirection::Horizontal && platformWheelEvent.deltaY())
platformWheelEvent = platformWheelEvent.copyIgnoringVerticalDelta();
}
#endif
#if ENABLE(ASYNC_SCROLLING)
MutexLocker locker(m_scrollingTreesMutex);
if (ThreadedScrollingTree* scrollingTree = m_scrollingTrees.get(pageID)) {
// FIXME: It's pretty horrible that we're updating the back/forward state here.
// WebCore should always know the current state and know when it changes so the
// scrolling tree can be notified.
// We only need to do this at the beginning of the gesture.
if (platformWheelEvent.phase() == PlatformWheelEventPhaseBegan)
ScrollingThread::dispatch(bind(&ThreadedScrollingTree::setCanRubberBandState, scrollingTree, canRubberBandAtLeft, canRubberBandAtRight, canRubberBandAtTop, canRubberBandAtBottom));
ScrollingTree::EventResult result = scrollingTree->tryToHandleWheelEvent(platformWheelEvent);
if (result == ScrollingTree::DidHandleEvent || result == ScrollingTree::DidNotHandleEvent) {
sendDidReceiveEvent(pageID, wheelEvent, result == ScrollingTree::DidHandleEvent);
return;
}
}
#else
UNUSED_PARAM(canRubberBandAtLeft);
UNUSED_PARAM(canRubberBandAtRight);
UNUSED_PARAM(canRubberBandAtTop);
UNUSED_PARAM(canRubberBandAtBottom);
#endif
RunLoop::main().dispatch(bind(&EventDispatcher::dispatchWheelEvent, this, pageID, wheelEvent));
}
void ScrollView::wheelEvent(PlatformWheelEvent& e)
{
// We don't allow mouse wheeling to happen in a ScrollView that has had its scrollbars explicitly disabled.
#if PLATFORM(WX)
if (!canHaveScrollbars()) {
#else
if (!canHaveScrollbars() || platformWidget()) {
#endif
return;
}
// Determine how much we want to scroll. If we can move at all, we will accept the event.
IntSize maxScrollDelta = maximumScrollPosition() - scrollPosition();
if ((e.deltaX() < 0 && maxScrollDelta.width() > 0) ||
(e.deltaX() > 0 && scrollOffset().width() > 0) ||
(e.deltaY() < 0 && maxScrollDelta.height() > 0) ||
(e.deltaY() > 0 && scrollOffset().height() > 0)) {
e.accept();
float deltaX = e.deltaX();
float deltaY = e.deltaY();
if (e.granularity() == ScrollByPageWheelEvent) {
ASSERT(deltaX == 0);
bool negative = deltaY < 0;
deltaY = max(max<int>(visibleHeight() * Scrollbar::minFractionToStepWhenPaging(), visibleHeight() - Scrollbar::maxOverlapBetweenPages()), 1);
if (negative)
deltaY = -deltaY;
}
scrollBy(IntSize(-deltaX, -deltaY));
}
}
void ScrollView::setFrameRect(const IntRect& newRect)
{
IntRect oldRect = frameRect();
if (newRect == oldRect)
return;
Widget::setFrameRect(newRect);
if (platformWidget())
return;
if (newRect.width() != oldRect.width() || newRect.height() != oldRect.height()) {
updateScrollbars(m_scrollOffset);
contentsResized();
}
frameRectsChanged();
}
ScrollingTree::EventResult ScrollingTree::tryToHandleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
{
MutexLocker lock(m_mutex);
if (m_hasWheelEventHandlers)
return SendToMainThread;
if (!m_nonFastScrollableRegion.isEmpty()) {
// FIXME: This is not correct for non-default scroll origins.
IntPoint position = wheelEvent.position();
position.moveBy(m_mainFrameScrollPosition);
if (m_nonFastScrollableRegion.contains(position))
return SendToMainThread;
}
}
if (willWheelEventStartSwipeGesture(wheelEvent))
return DidNotHandleEvent;
ScrollingThread::dispatch(bind(&ScrollingTree::handleWheelEvent, this, wheelEvent));
return DidHandleEvent;
}
ScrollResult RootFrameViewport::handleWheel(const PlatformWheelEvent& event)
{
updateScrollAnimator();
ScrollableArea& primary = !m_invertScrollOrder ? layoutViewport() : visualViewport();
ScrollableArea& secondary = !m_invertScrollOrder ? visualViewport() : layoutViewport();
ScrollResult viewScrollResult = primary.handleWheel(event);
// The visual viewport will only accept pixel scrolls.
if (!event.canScroll() || event.granularity() == ScrollByPageWheelEvent)
return viewScrollResult;
// TODO(sataya.m) : The delta in PlatformWheelEvent is negative when scrolling the
// wheel towards the user, so negate it to get the scroll delta that should be applied
// to the page. unusedScrollDelta computed in the ScrollResult is also negative. Say
// there is WheelEvent({0, -10} and page scroll by 2px and unusedScrollDelta computed
// is {0, -8}. Due to which we have to negate the unusedScrollDelta to obtain the expected
// animation.Please address http://crbug.com/504389.
DoublePoint oldOffset = secondary.scrollPositionDouble();
DoublePoint locationDelta;
if (viewScrollResult.didScroll()) {
locationDelta = -DoublePoint(viewScrollResult.unusedScrollDeltaX, viewScrollResult.unusedScrollDeltaY);
} else {
if (event.railsMode() != PlatformEvent::RailsModeVertical)
locationDelta.setX(-event.deltaX());
if (event.railsMode() != PlatformEvent::RailsModeHorizontal)
locationDelta.setY(-event.deltaY());
}
DoublePoint targetPosition = secondary.clampScrollPosition(
secondary.scrollPositionDouble() + toDoubleSize(locationDelta));
secondary.setScrollPosition(targetPosition, UserScroll);
DoublePoint usedLocationDelta(secondary.scrollPositionDouble() - oldOffset);
bool didScrollX = viewScrollResult.didScrollX || usedLocationDelta.x();
bool didScrollY = viewScrollResult.didScrollY || usedLocationDelta.y();
return ScrollResult(didScrollX, didScrollY, -viewScrollResult.unusedScrollDeltaX - usedLocationDelta.x(), -viewScrollResult.unusedScrollDeltaY - usedLocationDelta.y());
}
WheelEventDispatchMediator::WheelEventDispatchMediator(const PlatformWheelEvent& event, PassRefPtr<AbstractView> view)
{
if (!(event.deltaX() || event.deltaY()))
return;
setEvent(WheelEvent::create(FloatPoint(event.wheelTicksX(), event.wheelTicksY()), FloatPoint(event.deltaX(), event.deltaY()),
deltaMode(event), view, event.globalPosition(), event.position(),
event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), event.directionInvertedFromDevice()));
}
inline static unsigned deltaMode(const PlatformWheelEvent& event)
{
return event.granularity() == ScrollByPageWheelEvent ? WheelEvent::DOM_DELTA_PAGE : WheelEvent::DOM_DELTA_PIXEL;
}
void EventTargetNode::dispatchWheelEvent(PlatformWheelEvent& e)
{
ASSERT(!eventDispatchForbidden());
if (e.deltaX() == 0 && e.deltaY() == 0)
return;
FrameView* view = document()->view();
if (!view)
return;
IntPoint pos = view->windowToContents(e.pos());
// Convert the deltas from pixels to lines if we have a pixel scroll event.
float deltaX = e.deltaX();
float deltaY = e.deltaY();
// FIXME: Should we do anything with a ScrollByPageWheelEvent here?
// It will be treated like a line scroll of 1 right now.
if (e.granularity() == ScrollByPixelWheelEvent) {
deltaX /= cMouseWheelPixelsPerLineStep;
deltaY /= cMouseWheelPixelsPerLineStep;
}
RefPtr<WheelEvent> we = WheelEvent::create(e.deltaX(), e.deltaY(),
document()->defaultView(), e.globalX(), e.globalY(), pos.x(), pos.y(),
e.ctrlKey(), e.altKey(), e.shiftKey(), e.metaKey());
ExceptionCode ec = 0;
if (!dispatchEvent(we.release(), ec))
e.accept();
}
inline static WheelEvent::Granularity granularity(const PlatformWheelEvent& event)
{
return event.granularity() == ScrollByPageWheelEvent ? WheelEvent::Page : WheelEvent::Pixel;
}
PassRefPtrWillBeRawPtr<WheelEvent> WheelEvent::create(const PlatformWheelEvent& event, PassRefPtrWillBeRawPtr<AbstractView> view)
{
return adoptRefWillBeNoop(new WheelEvent(FloatPoint(event.wheelTicksX(), event.wheelTicksY()), FloatPoint(event.deltaX(), event.deltaY()),
convertDeltaMode(event), view, event.globalPosition(), event.position(),
event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
MouseEvent::platformModifiersToButtons(event.modifiers()),
event.canScroll(), event.hasPreciseScrollingDeltas(),
static_cast<Event::RailsMode>(event.railsMode())));
}
void EventTargetNode::dispatchWheelEvent(PlatformWheelEvent& e)
{
assert(!eventDispatchForbidden());
if (e.delta() == 0)
return;
FrameView* view = document()->view();
if (!view)
return;
IntPoint pos = view->viewportToContents(e.pos());
RefPtr<WheelEvent> we = new WheelEvent(e.isHorizontal(), e.delta(),
document()->defaultView(), e.globalX(), e.globalY(), pos.x(), pos.y(),
e.ctrlKey(), e.altKey(), e.shiftKey(), e.metaKey());
ExceptionCode ec = 0;
if (!dispatchEvent(we, ec, true))
e.accept();
}
void EventTargetNode::dispatchWheelEvent(PlatformWheelEvent& e)
{
ASSERT(!eventDispatchForbidden());
if (e.deltaX() == 0 && e.deltaY() == 0)
return;
FrameView* view = document()->view();
if (!view)
return;
IntPoint pos = view->windowToContents(e.pos());
RefPtr<WheelEvent> we = WheelEvent::create(e.deltaX(), e.deltaY(),
document()->defaultView(), e.globalX(), e.globalY(), pos.x(), pos.y(),
e.ctrlKey(), e.altKey(), e.shiftKey(), e.metaKey());
ExceptionCode ec = 0;
if (!dispatchEvent(we.release(), ec, true))
e.accept();
}
