diff options
Diffstat (limited to 'gfx/layers/apz/src/APZInputBridge.cpp')
| -rw-r--r-- | gfx/layers/apz/src/APZInputBridge.cpp | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/APZInputBridge.cpp b/gfx/layers/apz/src/APZInputBridge.cpp new file mode 100644 index 0000000000..bce801a6d2 --- /dev/null +++ b/gfx/layers/apz/src/APZInputBridge.cpp @@ -0,0 +1,435 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/layers/APZInputBridge.h" + +#include "AsyncPanZoomController.h" +#include "InputData.h" // for MouseInput, etc +#include "InputBlockState.h" // for InputBlockState +#include "OverscrollHandoffState.h" // for OverscrollHandoffState +#include "mozilla/EventForwards.h" +#include "mozilla/dom/WheelEventBinding.h" // for WheelEvent constants +#include "mozilla/EventStateManager.h" // for EventStateManager +#include "mozilla/layers/APZThreadUtils.h" // for AssertOnControllerThread, etc +#include "mozilla/MouseEvents.h" // for WidgetMouseEvent +#include "mozilla/StaticPrefs_apz.h" +#include "mozilla/StaticPrefs_general.h" +#include "mozilla/StaticPrefs_test.h" +#include "mozilla/TextEvents.h" // for WidgetKeyboardEvent +#include "mozilla/TouchEvents.h" // for WidgetTouchEvent +#include "mozilla/WheelHandlingHelper.h" // for WheelDeltaHorizontalizer, + // WheelDeltaAdjustmentStrategy + +namespace mozilla { +namespace layers { + +APZEventResult::APZEventResult() + : mStatus(nsEventStatus_eIgnore), + mInputBlockId(InputBlockState::NO_BLOCK_ID) {} + +APZEventResult::APZEventResult( + const RefPtr<AsyncPanZoomController>& aInitialTarget, + TargetConfirmationFlags aFlags) + : APZEventResult() { + mHandledResult = [&]() -> Maybe<APZHandledResult> { + if (!aInitialTarget->IsRootContent()) { + // If the initial target is not the root, this will definitely not be + // handled by the root. (The confirmed target is either the initial + // target, or a descendant.) + return Some( + APZHandledResult{APZHandledPlace::HandledByContent, aInitialTarget}); + } + + if (!aFlags.mDispatchToContent) { + // If the initial target is the root and we don't need to dispatch to + // content, the event will definitely be handled by the root. + return Some( + APZHandledResult{APZHandledPlace::HandledByRoot, aInitialTarget}); + } + + // Otherwise, we're not sure. + return Nothing(); + }(); + aInitialTarget->GetGuid(&mTargetGuid); +} + +void APZEventResult::SetStatusAsConsumeDoDefault( + const InputBlockState& aBlock) { + SetStatusAsConsumeDoDefault(aBlock.GetTargetApzc()); +} + +void APZEventResult::SetStatusAsConsumeDoDefault( + const RefPtr<AsyncPanZoomController>& aTarget) { + mStatus = nsEventStatus_eConsumeDoDefault; + mHandledResult = + Some(aTarget && aTarget->IsRootContent() + ? APZHandledResult{APZHandledPlace::HandledByRoot, aTarget} + : APZHandledResult{APZHandledPlace::HandledByContent, aTarget}); +} + +void APZEventResult::SetStatusForTouchEvent( + const InputBlockState& aBlock, TargetConfirmationFlags aFlags, + PointerEventsConsumableFlags aConsumableFlags, + const AsyncPanZoomController* aTarget) { + // Note, we need to continue setting mStatus to eIgnore in the {mHasRoom=true, + // mAllowedByTouchAction=false} case because this is the behaviour expected by + // APZEventState::ProcessTouchEvent() when it determines when to send a + // `pointercancel` event. TODO: Use something more descriptive than + // nsEventStatus for this purpose. + mStatus = aConsumableFlags.IsConsumable() ? nsEventStatus_eConsumeDoDefault + : nsEventStatus_eIgnore; + + UpdateHandledResult(aBlock, aConsumableFlags, aTarget, + aFlags.mDispatchToContent); +} + +void APZEventResult::UpdateHandledResult( + const InputBlockState& aBlock, + PointerEventsConsumableFlags aConsumableFlags, + const AsyncPanZoomController* aTarget, bool aDispatchToContent) { + // If the touch event's effect is disallowed by touch-action, treat it as if + // a touch event listener had preventDefault()-ed it (i.e. return + // HandledByContent, except we can do it eagerly rather than having to wait + // for the listener to run). + if (!aConsumableFlags.mAllowedByTouchAction) { + mHandledResult = + Some(APZHandledResult{APZHandledPlace::HandledByContent, aTarget}); + return; + } + + if (mHandledResult && !aDispatchToContent && !aConsumableFlags.mHasRoom) { + // Set result to Unhandled if we have no room to scroll, unless it + // was HandledByContent because we're over a dispatch-to-content region, + // in which case it should remain HandledByContent. + mHandledResult->mPlace = APZHandledPlace::Unhandled; + } + + if (aTarget && !aTarget->IsRootContent()) { + auto [result, rootApzc] = + aBlock.GetOverscrollHandoffChain()->ScrollingDownWillMoveDynamicToolbar( + aTarget); + if (result) { + MOZ_ASSERT(rootApzc && rootApzc->IsRootContent()); + // The event is actually consumed by a non-root APZC but scroll + // positions in all relevant APZCs are at the bottom edge, so if there's + // still contents covered by the dynamic toolbar we need to move the + // dynamic toolbar to make the covered contents visible, thus we need + // to tell it to GeckoView so we handle it as if it's consumed in the + // root APZC. + // IMPORTANT NOTE: If the incoming TargetConfirmationFlags has + // mDispatchToContent, we need to change it to Nothing() so that + // GeckoView can properly wait for results from the content on the + // main-thread. + mHandledResult = + aDispatchToContent + ? Nothing() + : Some(APZHandledResult{aConsumableFlags.IsConsumable() + ? APZHandledPlace::HandledByRoot + : APZHandledPlace::Unhandled, + rootApzc}); + } + } +} + +void APZEventResult::SetStatusForFastFling( + const TouchBlockState& aBlock, TargetConfirmationFlags aFlags, + PointerEventsConsumableFlags aConsumableFlags, + const AsyncPanZoomController* aTarget) { + MOZ_ASSERT(aBlock.IsDuringFastFling()); + + // Set eConsumeNoDefault for fast fling since we don't want to send the event + // to content at all. + mStatus = nsEventStatus_eConsumeNoDefault; + + // In the case of fast fling, the event will never be sent to content, so we + // want a result where `aDispatchToContent` is false whatever the original + // `aFlags.mDispatchToContent` is. + UpdateHandledResult(aBlock, aConsumableFlags, aTarget, false /* + aDispatchToContent */); +} + +static bool WillHandleMouseEvent(const WidgetMouseEventBase& aEvent) { + return aEvent.mMessage == eMouseMove || aEvent.mMessage == eMouseDown || + aEvent.mMessage == eMouseUp || aEvent.mMessage == eDragEnd || + (StaticPrefs::test_events_async_enabled() && + aEvent.mMessage == eMouseHitTest); +} + +/* static */ +Maybe<APZWheelAction> APZInputBridge::ActionForWheelEvent( + WidgetWheelEvent* aEvent) { + if (!(aEvent->mDeltaMode == dom::WheelEvent_Binding::DOM_DELTA_LINE || + aEvent->mDeltaMode == dom::WheelEvent_Binding::DOM_DELTA_PIXEL || + aEvent->mDeltaMode == dom::WheelEvent_Binding::DOM_DELTA_PAGE)) { + return Nothing(); + } + return EventStateManager::APZWheelActionFor(aEvent); +} + +APZEventResult APZInputBridge::ReceiveInputEvent( + WidgetInputEvent& aEvent, InputBlockCallback&& aCallback) { + APZThreadUtils::AssertOnControllerThread(); + + APZEventResult result; + + switch (aEvent.mClass) { + case eMouseEventClass: + case eDragEventClass: { + WidgetMouseEvent& mouseEvent = *aEvent.AsMouseEvent(); + if (WillHandleMouseEvent(mouseEvent)) { + MouseInput input(mouseEvent); + input.mOrigin = + ScreenPoint(mouseEvent.mRefPoint.x, mouseEvent.mRefPoint.y); + + result = ReceiveInputEvent(input, std::move(aCallback)); + + mouseEvent.mRefPoint = TruncatedToInt(ViewAs<LayoutDevicePixel>( + input.mOrigin, + PixelCastJustification::LayoutDeviceIsScreenForUntransformedEvent)); + mouseEvent.mFlags.mHandledByAPZ = input.mHandledByAPZ; + mouseEvent.mFocusSequenceNumber = input.mFocusSequenceNumber; +#ifdef XP_MACOSX + // It's not assumed that the click event has already been prevented, + // except mousedown event with ctrl key is pressed where we prevent + // click event from widget on Mac platform. + MOZ_ASSERT_IF(!mouseEvent.IsControl() || + mouseEvent.mMessage != eMouseDown || + mouseEvent.mButton != MouseButton::ePrimary, + !mouseEvent.mClickEventPrevented); +#else + MOZ_ASSERT( + !mouseEvent.mClickEventPrevented, + "It's not assumed that the click event has already been prevented"); +#endif + mouseEvent.mClickEventPrevented |= input.mPreventClickEvent; + MOZ_ASSERT_IF(mouseEvent.mClickEventPrevented, + mouseEvent.mMessage == eMouseDown || + mouseEvent.mMessage == eMouseUp); + aEvent.mLayersId = input.mLayersId; + + if (mouseEvent.IsReal()) { + UpdateWheelTransaction(mouseEvent.mRefPoint, mouseEvent.mMessage, + Some(result.mTargetGuid)); + } + + return result; + } + + if (mouseEvent.IsReal()) { + UpdateWheelTransaction(mouseEvent.mRefPoint, mouseEvent.mMessage, + Nothing()); + } + + ProcessUnhandledEvent(&mouseEvent.mRefPoint, &result.mTargetGuid, + &aEvent.mFocusSequenceNumber, &aEvent.mLayersId); + return result; + } + case eTouchEventClass: { + WidgetTouchEvent& touchEvent = *aEvent.AsTouchEvent(); + MultiTouchInput touchInput(touchEvent); + result = ReceiveInputEvent(touchInput, std::move(aCallback)); + // touchInput was modified in-place to possibly remove some + // touch points (if we are overscrolled), and the coordinates were + // modified using the APZ untransform. We need to copy these changes + // back into the WidgetInputEvent. + touchEvent.mTouches.Clear(); + touchEvent.mTouches.SetCapacity(touchInput.mTouches.Length()); + for (size_t i = 0; i < touchInput.mTouches.Length(); i++) { + *touchEvent.mTouches.AppendElement() = + touchInput.mTouches[i].ToNewDOMTouch(); + } + touchEvent.mFlags.mHandledByAPZ = touchInput.mHandledByAPZ; + touchEvent.mFocusSequenceNumber = touchInput.mFocusSequenceNumber; + aEvent.mLayersId = touchInput.mLayersId; + return result; + } + case eWheelEventClass: { + WidgetWheelEvent& wheelEvent = *aEvent.AsWheelEvent(); + + if (Maybe<APZWheelAction> action = ActionForWheelEvent(&wheelEvent)) { + ScrollWheelInput::ScrollMode scrollMode = + ScrollWheelInput::SCROLLMODE_INSTANT; + if (StaticPrefs::general_smoothScroll() && + ((wheelEvent.mDeltaMode == + dom::WheelEvent_Binding::DOM_DELTA_LINE && + StaticPrefs::general_smoothScroll_mouseWheel()) || + (wheelEvent.mDeltaMode == + dom::WheelEvent_Binding::DOM_DELTA_PAGE && + StaticPrefs::general_smoothScroll_pages()))) { + scrollMode = ScrollWheelInput::SCROLLMODE_SMOOTH; + } + + WheelDeltaAdjustmentStrategy strategy = + EventStateManager::GetWheelDeltaAdjustmentStrategy(wheelEvent); + // Adjust the delta values of the wheel event if the current default + // action is to horizontalize scrolling. I.e., deltaY values are set to + // deltaX and deltaY and deltaZ values are set to 0. + // If horizontalized, the delta values will be restored and its overflow + // deltaX will become 0 when the WheelDeltaHorizontalizer instance is + // being destroyed. + WheelDeltaHorizontalizer horizontalizer(wheelEvent); + if (WheelDeltaAdjustmentStrategy::eHorizontalize == strategy) { + horizontalizer.Horizontalize(); + } + + // If the wheel event becomes no-op event, don't handle it as scroll. + if (wheelEvent.mDeltaX || wheelEvent.mDeltaY) { + ScreenPoint origin(wheelEvent.mRefPoint.x, wheelEvent.mRefPoint.y); + ScrollWheelInput input( + wheelEvent.mTimeStamp, 0, scrollMode, + ScrollWheelInput::DeltaTypeForDeltaMode(wheelEvent.mDeltaMode), + origin, wheelEvent.mDeltaX, wheelEvent.mDeltaY, + wheelEvent.mAllowToOverrideSystemScrollSpeed, strategy); + input.mAPZAction = action.value(); + + // We add the user multiplier as a separate field, rather than + // premultiplying it, because if the input is converted back to a + // WidgetWheelEvent, then EventStateManager would apply the delta a + // second time. We could in theory work around this by asking ESM to + // customize the event much sooner, and then save the + // "mCustomizedByUserPrefs" bit on ScrollWheelInput - but for now, + // this seems easier. + EventStateManager::GetUserPrefsForWheelEvent( + &wheelEvent, &input.mUserDeltaMultiplierX, + &input.mUserDeltaMultiplierY); + + result = ReceiveInputEvent(input, std::move(aCallback)); + wheelEvent.mRefPoint = TruncatedToInt(ViewAs<LayoutDevicePixel>( + input.mOrigin, PixelCastJustification:: + LayoutDeviceIsScreenForUntransformedEvent)); + wheelEvent.mFlags.mHandledByAPZ = input.mHandledByAPZ; + wheelEvent.mFocusSequenceNumber = input.mFocusSequenceNumber; + aEvent.mLayersId = input.mLayersId; + + return result; + } + } + + UpdateWheelTransaction(aEvent.mRefPoint, aEvent.mMessage, Nothing()); + ProcessUnhandledEvent(&aEvent.mRefPoint, &result.mTargetGuid, + &aEvent.mFocusSequenceNumber, &aEvent.mLayersId); + MOZ_ASSERT(result.GetStatus() == nsEventStatus_eIgnore); + return result; + } + case eKeyboardEventClass: { + WidgetKeyboardEvent& keyboardEvent = *aEvent.AsKeyboardEvent(); + + KeyboardInput input(keyboardEvent); + + result = ReceiveInputEvent(input, std::move(aCallback)); + + keyboardEvent.mFlags.mHandledByAPZ = input.mHandledByAPZ; + keyboardEvent.mFocusSequenceNumber = input.mFocusSequenceNumber; + return result; + } + default: { + UpdateWheelTransaction(aEvent.mRefPoint, aEvent.mMessage, Nothing()); + ProcessUnhandledEvent(&aEvent.mRefPoint, &result.mTargetGuid, + &aEvent.mFocusSequenceNumber, &aEvent.mLayersId); + return result; + } + } + + MOZ_ASSERT_UNREACHABLE("Invalid WidgetInputEvent type."); + result.SetStatusAsConsumeNoDefault(); + return result; +} + +APZHandledResult::APZHandledResult(APZHandledPlace aPlace, + const AsyncPanZoomController* aTarget) + : mPlace(aPlace) { + MOZ_ASSERT(aTarget); + switch (aPlace) { + case APZHandledPlace::Unhandled: + break; + case APZHandledPlace::HandledByContent: + if (aTarget) { + mScrollableDirections = aTarget->ScrollableDirections(); + mOverscrollDirections = aTarget->GetAllowedHandoffDirections(); + } + break; + case APZHandledPlace::HandledByRoot: { + MOZ_ASSERT(aTarget->IsRootContent()); + if (aTarget) { + mScrollableDirections = aTarget->ScrollableDirections(); + mOverscrollDirections = aTarget->GetAllowedHandoffDirections(); + } + break; + } + default: + MOZ_ASSERT_UNREACHABLE("Invalid APZHandledPlace"); + break; + } +} + +std::ostream& operator<<(std::ostream& aOut, const SideBits& aSideBits) { + if ((aSideBits & SideBits::eAll) == SideBits::eAll) { + aOut << "all"; + } else { + AutoTArray<nsCString, 4> strings; + if (aSideBits & SideBits::eTop) { + strings.AppendElement("top"_ns); + } + if (aSideBits & SideBits::eRight) { + strings.AppendElement("right"_ns); + } + if (aSideBits & SideBits::eBottom) { + strings.AppendElement("bottom"_ns); + } + if (aSideBits & SideBits::eLeft) { + strings.AppendElement("left"_ns); + } + aOut << strings; + } + return aOut; +} + +std::ostream& operator<<(std::ostream& aOut, + const ScrollDirections& aScrollDirections) { + if (aScrollDirections.contains(EitherScrollDirection)) { + aOut << "either"; + } else if (aScrollDirections.contains(HorizontalScrollDirection)) { + aOut << "horizontal"; + } else if (aScrollDirections.contains(VerticalScrollDirection)) { + aOut << "vertical"; + } else { + aOut << "none"; + } + return aOut; +} + +std::ostream& operator<<(std::ostream& aOut, + const APZHandledPlace& aHandledPlace) { + switch (aHandledPlace) { + case APZHandledPlace::Unhandled: + aOut << "unhandled"; + break; + case APZHandledPlace::HandledByRoot: { + aOut << "handled-by-root"; + break; + } + case APZHandledPlace::HandledByContent: { + aOut << "handled-by-content"; + break; + } + case APZHandledPlace::Invalid: { + aOut << "INVALID"; + break; + } + } + return aOut; +} + +std::ostream& operator<<(std::ostream& aOut, + const APZHandledResult& aHandledResult) { + aOut << "handled: " << aHandledResult.mPlace << ", "; + aOut << "scrollable: " << aHandledResult.mScrollableDirections << ", "; + aOut << "overscroll: " << aHandledResult.mOverscrollDirections << std::endl; + return aOut; +} + +} // namespace layers +} // namespace mozilla |