diff options
Diffstat (limited to 'gfx/layers/apz/src/InputBlockState.cpp')
| -rw-r--r-- | gfx/layers/apz/src/InputBlockState.cpp | 840 |
1 files changed, 840 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/InputBlockState.cpp b/gfx/layers/apz/src/InputBlockState.cpp new file mode 100644 index 0000000000..b492af0215 --- /dev/null +++ b/gfx/layers/apz/src/InputBlockState.cpp @@ -0,0 +1,840 @@ +/* -*- 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 "InputBlockState.h" + +#include "APZUtils.h" +#include "AsyncPanZoomController.h" // for AsyncPanZoomController + +#include "mozilla/MouseEvents.h" +#include "mozilla/StaticPrefs_apz.h" +#include "mozilla/StaticPrefs_layout.h" +#include "mozilla/StaticPrefs_mousewheel.h" +#include "mozilla/StaticPrefs_test.h" +#include "mozilla/Telemetry.h" // for Telemetry +#include "mozilla/ToString.h" +#include "mozilla/layers/IAPZCTreeManager.h" // for AllowedTouchBehavior +#include "OverscrollHandoffState.h" +#include "QueuedInput.h" + +static mozilla::LazyLogModule sApzIbsLog("apz.inputstate"); +#define TBS_LOG(...) MOZ_LOG(sApzIbsLog, LogLevel::Debug, (__VA_ARGS__)) + +namespace mozilla { +namespace layers { + +static uint64_t sBlockCounter = InputBlockState::NO_BLOCK_ID + 1; + +InputBlockState::InputBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationFlags aFlags) + : mTargetApzc(aTargetApzc), + mRequiresTargetConfirmation(aFlags.mRequiresTargetConfirmation), + mBlockId(sBlockCounter++), + mTransformToApzc(aTargetApzc->GetTransformToThis()) { + // We should never be constructed with a nullptr target. + MOZ_ASSERT(mTargetApzc); + mOverscrollHandoffChain = mTargetApzc->BuildOverscrollHandoffChain(); + // If a new block starts on a scrollthumb and we have APZ scrollbar + // dragging enabled, defer confirmation until we get the drag metrics + // for the thumb. + bool startingDrag = StaticPrefs::apz_drag_enabled() && aFlags.mHitScrollThumb; + mTargetConfirmed = aFlags.mTargetConfirmed && !startingDrag + ? TargetConfirmationState::eConfirmed + : TargetConfirmationState::eUnconfirmed; +} + +bool InputBlockState::SetConfirmedTargetApzc( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationState aState, InputData* aFirstInput, + bool aForScrollbarDrag) { + MOZ_ASSERT(aState == TargetConfirmationState::eConfirmed || + aState == TargetConfirmationState::eTimedOut); + + if (mTargetConfirmed == TargetConfirmationState::eTimedOut && + aState == TargetConfirmationState::eConfirmed) { + // The main thread finally responded. We had already timed out the + // confirmation, but we want to update the state internally so that we + // can record the time for telemetry purposes. + mTargetConfirmed = TargetConfirmationState::eTimedOutAndMainThreadResponded; + } + // Sometimes, bugs in compositor hit testing can lead to APZ confirming + // a different target than the main thread. If this happens for a drag + // block created for a scrollbar drag, the consequences can be fairly + // user-unfriendly, such as the scrollbar not being draggable at all, + // or it scrolling the contents of the wrong scrollframe. In debug + // builds, we assert in this situation, so that the + // underlying compositor hit testing bug can be fixed. In release builds, + // however, we just silently accept the main thread's confirmed target, + // which will produce the expected behaviour (apart from drag events + // received so far being dropped). + if (AsDragBlock() && aForScrollbarDrag && + mTargetConfirmed == TargetConfirmationState::eConfirmed && + aState == TargetConfirmationState::eConfirmed && mTargetApzc && + aTargetApzc && mTargetApzc->GetGuid() != aTargetApzc->GetGuid()) { + MOZ_ASSERT(false, + "APZ and main thread confirmed scrollbar drag block with " + "different targets"); + UpdateTargetApzc(aTargetApzc); + return true; + } + + if (mTargetConfirmed != TargetConfirmationState::eUnconfirmed) { + return false; + } + mTargetConfirmed = aState; + + TBS_LOG("%p got confirmed target APZC %p\n", this, mTargetApzc.get()); + if (mTargetApzc == aTargetApzc) { + // The confirmed target is the same as the tentative one, so we're done. + return true; + } + + TBS_LOG("%p replacing unconfirmed target %p with real target %p\n", this, + mTargetApzc.get(), aTargetApzc.get()); + + UpdateTargetApzc(aTargetApzc); + return true; +} + +void InputBlockState::UpdateTargetApzc( + const RefPtr<AsyncPanZoomController>& aTargetApzc) { + if (mTargetApzc == aTargetApzc) { + MOZ_ASSERT_UNREACHABLE( + "The new target APZC should be different from the old one"); + return; + } + + if (mTargetApzc) { + // Restore overscroll state on the previous target APZC and ancestor APZCs + // in the scroll handoff chain other than the new one. + mTargetApzc->SnapBackIfOverscrolled(); + + uint32_t i = mOverscrollHandoffChain->IndexOf(mTargetApzc) + 1; + for (; i < mOverscrollHandoffChain->Length(); i++) { + AsyncPanZoomController* apzc = mOverscrollHandoffChain->GetApzcAtIndex(i); + if (apzc != aTargetApzc) { + MOZ_ASSERT(!apzc->IsOverscrolled() || + apzc->IsOverscrollAnimationRunning()); + apzc->SnapBackIfOverscrolled(); + } + } + } + + // note that aTargetApzc MAY be null here. + mTargetApzc = aTargetApzc; + mTransformToApzc = aTargetApzc ? aTargetApzc->GetTransformToThis() + : ScreenToParentLayerMatrix4x4(); + mOverscrollHandoffChain = + (mTargetApzc ? mTargetApzc->BuildOverscrollHandoffChain() : nullptr); +} + +const RefPtr<AsyncPanZoomController>& InputBlockState::GetTargetApzc() const { + return mTargetApzc; +} + +const RefPtr<const OverscrollHandoffChain>& +InputBlockState::GetOverscrollHandoffChain() const { + return mOverscrollHandoffChain; +} + +uint64_t InputBlockState::GetBlockId() const { return mBlockId; } + +bool InputBlockState::IsTargetConfirmed() const { + return mTargetConfirmed != TargetConfirmationState::eUnconfirmed; +} + +bool InputBlockState::HasReceivedRealConfirmedTarget() const { + return mTargetConfirmed == TargetConfirmationState::eConfirmed || + mTargetConfirmed == + TargetConfirmationState::eTimedOutAndMainThreadResponded; +} + +bool InputBlockState::ShouldDropEvents() const { + return mRequiresTargetConfirmation && + (mTargetConfirmed != TargetConfirmationState::eConfirmed); +} + +bool InputBlockState::IsDownchainOf(AsyncPanZoomController* aA, + AsyncPanZoomController* aB) const { + if (aA == aB) { + return true; + } + + bool seenA = false; + for (size_t i = 0; i < mOverscrollHandoffChain->Length(); ++i) { + AsyncPanZoomController* apzc = mOverscrollHandoffChain->GetApzcAtIndex(i); + if (apzc == aB) { + return seenA; + } + if (apzc == aA) { + seenA = true; + } + } + return false; +} + +void InputBlockState::SetScrolledApzc(AsyncPanZoomController* aApzc) { + // An input block should only have one scrolled APZC. + MOZ_ASSERT(!mScrolledApzc || (StaticPrefs::apz_allow_immediate_handoff() + ? IsDownchainOf(mScrolledApzc, aApzc) + : mScrolledApzc == aApzc)); + + mScrolledApzc = aApzc; +} + +AsyncPanZoomController* InputBlockState::GetScrolledApzc() const { + return mScrolledApzc; +} + +bool InputBlockState::IsDownchainOfScrolledApzc( + AsyncPanZoomController* aApzc) const { + MOZ_ASSERT(aApzc && mScrolledApzc); + + return IsDownchainOf(mScrolledApzc, aApzc); +} + +void InputBlockState::DispatchEvent(const InputData& aEvent) const { + GetTargetApzc()->HandleInputEvent(aEvent, mTransformToApzc); +} + +CancelableBlockState::CancelableBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationFlags aFlags) + : InputBlockState(aTargetApzc, aFlags), + mPreventDefault(false), + mContentResponded(false), + mContentResponseTimerExpired(false) {} + +bool CancelableBlockState::SetContentResponse(bool aPreventDefault) { + if (mContentResponded) { + return false; + } + TBS_LOG("%p got content response %d with timer expired %d\n", this, + aPreventDefault, mContentResponseTimerExpired); + mPreventDefault = aPreventDefault; + mContentResponded = true; + return true; +} + +bool CancelableBlockState::TimeoutContentResponse() { + if (mContentResponseTimerExpired) { + return false; + } + TBS_LOG("%p got content timer expired with response received %d\n", this, + mContentResponded); + if (!mContentResponded) { + mPreventDefault = false; + } + mContentResponseTimerExpired = true; + return true; +} + +bool CancelableBlockState::IsContentResponseTimerExpired() const { + return mContentResponseTimerExpired; +} + +bool CancelableBlockState::IsDefaultPrevented() const { + MOZ_ASSERT(mContentResponded || mContentResponseTimerExpired); + return mPreventDefault; +} + +bool CancelableBlockState::IsReadyForHandling() const { + if (!IsTargetConfirmed()) { + return false; + } + return mContentResponded || mContentResponseTimerExpired; +} + +bool CancelableBlockState::ShouldDropEvents() const { + return InputBlockState::ShouldDropEvents() || IsDefaultPrevented(); +} + +DragBlockState::DragBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationFlags aFlags, const MouseInput& aInitialEvent) + : CancelableBlockState(aTargetApzc, aFlags), mReceivedMouseUp(false) {} + +bool DragBlockState::HasReceivedMouseUp() { return mReceivedMouseUp; } + +void DragBlockState::MarkMouseUpReceived() { mReceivedMouseUp = true; } + +void DragBlockState::SetInitialThumbPos(OuterCSSCoord aThumbPos) { + mInitialThumbPos = aThumbPos; +} + +void DragBlockState::SetDragMetrics(const AsyncDragMetrics& aDragMetrics) { + mDragMetrics = aDragMetrics; +} + +void DragBlockState::DispatchEvent(const InputData& aEvent) const { + MouseInput mouseInput = aEvent.AsMouseInput(); + if (!mouseInput.TransformToLocal(mTransformToApzc)) { + return; + } + + GetTargetApzc()->HandleDragEvent(mouseInput, mDragMetrics, mInitialThumbPos); +} + +bool DragBlockState::MustStayActive() { return !mReceivedMouseUp; } + +const char* DragBlockState::Type() { return "drag"; } +// This is used to track the current wheel transaction. +static uint64_t sLastWheelBlockId = InputBlockState::NO_BLOCK_ID; + +WheelBlockState::WheelBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationFlags aFlags, const ScrollWheelInput& aInitialEvent) + : CancelableBlockState(aTargetApzc, aFlags), + mScrollSeriesCounter(0), + mTransactionEnded(false) { + sLastWheelBlockId = GetBlockId(); + + if (aFlags.mTargetConfirmed) { + // Find the nearest APZC in the overscroll handoff chain that is scrollable. + // If we get a content confirmation later that the apzc is different, then + // content should have found a scrollable apzc, so we don't need to handle + // that case. + RefPtr<AsyncPanZoomController> apzc = + mOverscrollHandoffChain->FindFirstScrollable(aInitialEvent, + &mAllowedScrollDirections); + + if (apzc) { + if (apzc != GetTargetApzc()) { + UpdateTargetApzc(apzc); + } + } else if (!mOverscrollHandoffChain->CanBePanned( + mOverscrollHandoffChain->GetApzcAtIndex(0))) { + // If there's absolutely nothing scrollable start a transaction and mark + // this as such to we know to store our EventTime. + mIsScrollable = false; + } else { + // Scrollable, but not in this direction. + EndTransaction(); + } + } +} + +bool WheelBlockState::SetContentResponse(bool aPreventDefault) { + if (aPreventDefault) { + EndTransaction(); + } + return CancelableBlockState::SetContentResponse(aPreventDefault); +} + +bool WheelBlockState::SetConfirmedTargetApzc( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationState aState, InputData* aFirstInput, + bool aForScrollbarDrag) { + // The APZC that we find via APZCCallbackHelpers may not be the same APZC + // ESM or OverscrollHandoff would have computed. Make sure we get the right + // one by looking for the first apzc the next pending event can scroll. + RefPtr<AsyncPanZoomController> apzc = aTargetApzc; + if (apzc && aFirstInput) { + apzc = apzc->BuildOverscrollHandoffChain()->FindFirstScrollable( + *aFirstInput, &mAllowedScrollDirections); + } + + InputBlockState::SetConfirmedTargetApzc(apzc, aState, aFirstInput, + aForScrollbarDrag); + return true; +} + +void WheelBlockState::Update(ScrollWheelInput& aEvent) { + // We might not be in a transaction if the block never started in a + // transaction - for example, if nothing was scrollable. + if (!InTransaction()) { + return; + } + + // The current "scroll series" is a like a sub-transaction. It has a separate + // timeout of 80ms. Since we need to compute wheel deltas at different phases + // of a transaction (for example, when it is updated, and later when the + // event action is taken), we affix the scroll series counter to the event. + // This makes GetScrollWheelDelta() consistent. + if (!mLastEventTime.IsNull() && + (aEvent.mTimeStamp - mLastEventTime).ToMilliseconds() > + StaticPrefs::mousewheel_scroll_series_timeout()) { + mScrollSeriesCounter = 0; + } + aEvent.mScrollSeriesNumber = ++mScrollSeriesCounter; + + // If we can't scroll in the direction of the wheel event, we don't update + // the last move time. This allows us to timeout a transaction even if the + // mouse isn't moving. + // + // We skip this check if the target is not yet confirmed, so that when it is + // confirmed, we don't timeout the transaction. + RefPtr<AsyncPanZoomController> apzc = GetTargetApzc(); + if (mIsScrollable && IsTargetConfirmed() && !apzc->CanScroll(aEvent)) { + return; + } + + // Update the time of the last known good event, and reset the mouse move + // time to null. This will reset the delays on both the general transaction + // timeout and the mouse-move-in-frame timeout. + mLastEventTime = aEvent.mTimeStamp; + mLastMouseMove = TimeStamp(); +} + +bool WheelBlockState::MustStayActive() { return !mTransactionEnded; } + +const char* WheelBlockState::Type() { return "scroll wheel"; } + +bool WheelBlockState::ShouldAcceptNewEvent() const { + if (!InTransaction()) { + // If we're not in a transaction, start a new one. + return false; + } + + RefPtr<AsyncPanZoomController> apzc = GetTargetApzc(); + if (apzc->IsDestroyed()) { + return false; + } + + return true; +} + +bool WheelBlockState::MaybeTimeout(const ScrollWheelInput& aEvent) { + MOZ_ASSERT(InTransaction()); + + if (MaybeTimeout(aEvent.mTimeStamp)) { + return true; + } + + if (!mLastMouseMove.IsNull()) { + // If there's a recent mouse movement, we can time out the transaction + // early. + TimeDuration duration = TimeStamp::Now() - mLastMouseMove; + if (duration.ToMilliseconds() >= + StaticPrefs::mousewheel_transaction_ignoremovedelay()) { + TBS_LOG("%p wheel transaction timed out after mouse move\n", this); + EndTransaction(); + return true; + } + } + + return false; +} + +bool WheelBlockState::MaybeTimeout(const TimeStamp& aTimeStamp) { + MOZ_ASSERT(InTransaction()); + + // End the transaction if the event occurred > 1.5s after the most recently + // seen wheel event. + TimeDuration duration = aTimeStamp - mLastEventTime; + if (duration.ToMilliseconds() < + StaticPrefs::mousewheel_transaction_timeout()) { + return false; + } + + TBS_LOG("%p wheel transaction timed out\n", this); + + if (StaticPrefs::test_mousescroll()) { + RefPtr<AsyncPanZoomController> apzc = GetTargetApzc(); + apzc->NotifyMozMouseScrollEvent(u"MozMouseScrollTransactionTimeout"_ns); + } + + EndTransaction(); + return true; +} + +void WheelBlockState::OnMouseMove( + const ScreenIntPoint& aPoint, + const Maybe<ScrollableLayerGuid>& aTargetGuid) { + MOZ_ASSERT(InTransaction()); + + if (!GetTargetApzc()->Contains(aPoint) || + // If the mouse moved over to a different APZC, `mIsScrollable` + // may no longer be false and needs to be recomputed. + (!mIsScrollable && aTargetGuid.isSome() && + aTargetGuid.value() != GetTargetApzc()->GetGuid())) { + EndTransaction(); + return; + } + + if (mLastMouseMove.IsNull()) { + // If the cursor is moving inside the frame, and it is more than the + // ignoremovedelay time since the last scroll operation, we record + // this as the most recent mouse movement. + TimeStamp now = TimeStamp::Now(); + TimeDuration duration = now - mLastEventTime; + if (duration.ToMilliseconds() >= + StaticPrefs::mousewheel_transaction_ignoremovedelay()) { + mLastMouseMove = now; + } + } +} + +void WheelBlockState::UpdateTargetApzc( + const RefPtr<AsyncPanZoomController>& aTargetApzc) { + InputBlockState::UpdateTargetApzc(aTargetApzc); + + // If we found there was no target apzc, then we end the transaction. + if (!GetTargetApzc()) { + EndTransaction(); + } +} + +bool WheelBlockState::InTransaction() const { + // We consider a wheel block to be in a transaction if it has a confirmed + // target and is the most recent wheel input block to be created. + if (GetBlockId() != sLastWheelBlockId) { + return false; + } + + if (mTransactionEnded) { + return false; + } + + MOZ_ASSERT(GetTargetApzc()); + return true; +} + +bool WheelBlockState::AllowScrollHandoff() const { + // If we're in a wheel transaction, we do not allow overscroll handoff until + // a new event ends the wheel transaction. + return !IsTargetConfirmed() || !InTransaction(); +} + +void WheelBlockState::EndTransaction() { + TBS_LOG("%p ending wheel transaction\n", this); + mTransactionEnded = true; +} + +PanGestureBlockState::PanGestureBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationFlags aFlags, const PanGestureInput& aInitialEvent) + : CancelableBlockState(aTargetApzc, aFlags), + mInterrupted(false), + mWaitingForContentResponse(false), + mWaitingForBrowserGestureResponse(false), + mStartedBrowserGesture(false) { + if (aFlags.mTargetConfirmed) { + // Find the nearest APZC in the overscroll handoff chain that is scrollable. + // If we get a content confirmation later that the apzc is different, then + // content should have found a scrollable apzc, so we don't need to handle + // that case. + RefPtr<AsyncPanZoomController> apzc = + mOverscrollHandoffChain->FindFirstScrollable(aInitialEvent, + &mAllowedScrollDirections); + + if (apzc && apzc != GetTargetApzc()) { + UpdateTargetApzc(apzc); + } + } +} + +bool PanGestureBlockState::SetConfirmedTargetApzc( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationState aState, InputData* aFirstInput, + bool aForScrollbarDrag) { + // The APZC that we find via APZCCallbackHelpers may not be the same APZC + // ESM or OverscrollHandoff would have computed. Make sure we get the right + // one by looking for the first apzc the next pending event can scroll. + RefPtr<AsyncPanZoomController> apzc = aTargetApzc; + if (apzc && aFirstInput) { + RefPtr<AsyncPanZoomController> scrollableApzc = + apzc->BuildOverscrollHandoffChain()->FindFirstScrollable( + *aFirstInput, &mAllowedScrollDirections); + if (scrollableApzc) { + apzc = scrollableApzc; + } + } + + InputBlockState::SetConfirmedTargetApzc(apzc, aState, aFirstInput, + aForScrollbarDrag); + return true; +} + +bool PanGestureBlockState::MustStayActive() { return !mInterrupted; } + +const char* PanGestureBlockState::Type() { return "pan gesture"; } + +bool PanGestureBlockState::SetContentResponse(bool aPreventDefault) { + if (aPreventDefault) { + TBS_LOG("%p setting interrupted flag\n", this); + mInterrupted = true; + } + bool stateChanged = CancelableBlockState::SetContentResponse(aPreventDefault); + if (mWaitingForContentResponse) { + mWaitingForContentResponse = false; + stateChanged = true; + } + return stateChanged; +} + +bool PanGestureBlockState::IsReadyForHandling() const { + if (!CancelableBlockState::IsReadyForHandling()) { + return false; + } + return !mWaitingForBrowserGestureResponse && + (!mWaitingForContentResponse || IsContentResponseTimerExpired()); +} + +bool PanGestureBlockState::ShouldDropEvents() const { + return CancelableBlockState::ShouldDropEvents() || mStartedBrowserGesture; +} + +bool PanGestureBlockState::TimeoutContentResponse() { + // Reset mWaitingForBrowserGestureResponse here so that we will not wait for + // the response forever. + mWaitingForBrowserGestureResponse = false; + return CancelableBlockState::TimeoutContentResponse(); +} + +bool PanGestureBlockState::AllowScrollHandoff() const { return false; } + +void PanGestureBlockState::SetNeedsToWaitForContentResponse( + bool aWaitForContentResponse) { + mWaitingForContentResponse = aWaitForContentResponse; +} + +void PanGestureBlockState::SetNeedsToWaitForBrowserGestureResponse( + bool aWaitForBrowserGestureResponse) { + mWaitingForBrowserGestureResponse = aWaitForBrowserGestureResponse; +} + +void PanGestureBlockState::SetBrowserGestureResponse( + BrowserGestureResponse aResponse) { + mWaitingForBrowserGestureResponse = false; + mStartedBrowserGesture = bool(aResponse); +} + +PinchGestureBlockState::PinchGestureBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationFlags aFlags) + : CancelableBlockState(aTargetApzc, aFlags), + mInterrupted(false), + mWaitingForContentResponse(false) {} + +bool PinchGestureBlockState::MustStayActive() { return true; } + +const char* PinchGestureBlockState::Type() { return "pinch gesture"; } + +bool PinchGestureBlockState::SetContentResponse(bool aPreventDefault) { + if (aPreventDefault) { + TBS_LOG("%p setting interrupted flag\n", this); + mInterrupted = true; + } + bool stateChanged = CancelableBlockState::SetContentResponse(aPreventDefault); + if (mWaitingForContentResponse) { + mWaitingForContentResponse = false; + stateChanged = true; + } + return stateChanged; +} + +bool PinchGestureBlockState::IsReadyForHandling() const { + if (!CancelableBlockState::IsReadyForHandling()) { + return false; + } + return !mWaitingForContentResponse || IsContentResponseTimerExpired(); +} + +void PinchGestureBlockState::SetNeedsToWaitForContentResponse( + bool aWaitForContentResponse) { + mWaitingForContentResponse = aWaitForContentResponse; +} + +TouchBlockState::TouchBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc, + TargetConfirmationFlags aFlags, TouchCounter& aCounter) + : CancelableBlockState(aTargetApzc, aFlags), + mAllowedTouchBehaviorSet(false), + mDuringFastFling(false), + mSingleTapOccurred(false), + mInSlop(false), + mTouchCounter(aCounter), + mStartTime(GetTargetApzc()->GetFrameTime().Time()) { + TBS_LOG("Creating %p\n", this); +} + +bool TouchBlockState::SetAllowedTouchBehaviors( + const nsTArray<TouchBehaviorFlags>& aBehaviors) { + if (mAllowedTouchBehaviorSet) { + return false; + } + TBS_LOG("%p got allowed touch behaviours for %zu points\n", this, + aBehaviors.Length()); + mAllowedTouchBehaviors.AppendElements(aBehaviors); + mAllowedTouchBehaviorSet = true; + return true; +} + +bool TouchBlockState::GetAllowedTouchBehaviors( + nsTArray<TouchBehaviorFlags>& aOutBehaviors) const { + if (!mAllowedTouchBehaviorSet) { + return false; + } + aOutBehaviors.AppendElements(mAllowedTouchBehaviors); + return true; +} + +bool TouchBlockState::HasAllowedTouchBehaviors() const { + return mAllowedTouchBehaviorSet; +} + +void TouchBlockState::CopyPropertiesFrom(const TouchBlockState& aOther) { + TBS_LOG("%p copying properties from %p\n", this, &aOther); + MOZ_ASSERT(aOther.mAllowedTouchBehaviorSet || + aOther.IsContentResponseTimerExpired()); + SetAllowedTouchBehaviors(aOther.mAllowedTouchBehaviors); + mTransformToApzc = aOther.mTransformToApzc; +} + +bool TouchBlockState::IsReadyForHandling() const { + if (!CancelableBlockState::IsReadyForHandling()) { + return false; + } + + return mAllowedTouchBehaviorSet || IsContentResponseTimerExpired(); +} + +void TouchBlockState::SetDuringFastFling() { + TBS_LOG("%p setting fast-motion flag\n", this); + mDuringFastFling = true; +} + +bool TouchBlockState::IsDuringFastFling() const { return mDuringFastFling; } + +void TouchBlockState::SetSingleTapOccurred() { + TBS_LOG("%p setting single-tap-occurred flag\n", this); + mSingleTapOccurred = true; +} + +bool TouchBlockState::SingleTapOccurred() const { return mSingleTapOccurred; } + +bool TouchBlockState::MustStayActive() { return true; } + +const char* TouchBlockState::Type() { return "touch"; } + +TimeDuration TouchBlockState::GetTimeSinceBlockStart() const { + return GetTargetApzc()->GetFrameTime().Time() - mStartTime; +} + +void TouchBlockState::DispatchEvent(const InputData& aEvent) const { + MOZ_ASSERT(aEvent.mInputType == MULTITOUCH_INPUT); + mTouchCounter.Update(aEvent.AsMultiTouchInput()); + CancelableBlockState::DispatchEvent(aEvent); +} + +bool TouchBlockState::TouchActionAllowsPinchZoom() const { + // Pointer events specification requires that all touch points allow zoom. + for (auto& behavior : mAllowedTouchBehaviors) { + if (!(behavior & AllowedTouchBehavior::PINCH_ZOOM)) { + return false; + } + } + return true; +} + +bool TouchBlockState::TouchActionAllowsDoubleTapZoom() const { + for (auto& behavior : mAllowedTouchBehaviors) { + if (!(behavior & AllowedTouchBehavior::ANIMATING_ZOOM)) { + return false; + } + } + return true; +} + +bool TouchBlockState::TouchActionAllowsPanningX() const { + if (mAllowedTouchBehaviors.IsEmpty()) { + // Default to allowed + return true; + } + TouchBehaviorFlags flags = mAllowedTouchBehaviors[0]; + return (flags & AllowedTouchBehavior::HORIZONTAL_PAN); +} + +bool TouchBlockState::TouchActionAllowsPanningY() const { + if (mAllowedTouchBehaviors.IsEmpty()) { + // Default to allowed + return true; + } + TouchBehaviorFlags flags = mAllowedTouchBehaviors[0]; + return (flags & AllowedTouchBehavior::VERTICAL_PAN); +} + +bool TouchBlockState::TouchActionAllowsPanningXY() const { + if (mAllowedTouchBehaviors.IsEmpty()) { + // Default to allowed + return true; + } + TouchBehaviorFlags flags = mAllowedTouchBehaviors[0]; + return (flags & AllowedTouchBehavior::HORIZONTAL_PAN) && + (flags & AllowedTouchBehavior::VERTICAL_PAN); +} + +bool TouchBlockState::UpdateSlopState(const MultiTouchInput& aInput, + bool aApzcCanConsumeEvents) { + if (aInput.mType == MultiTouchInput::MULTITOUCH_START) { + // this is by definition the first event in this block. If it's the first + // touch, then we enter a slop state. + mInSlop = (aInput.mTouches.Length() == 1); + if (mInSlop) { + mSlopOrigin = aInput.mTouches[0].mScreenPoint; + TBS_LOG("%p entering slop with origin %s\n", this, + ToString(mSlopOrigin).c_str()); + } + return false; + } + if (mInSlop) { + ScreenCoord threshold = 0; + // If the target was confirmed to null then the threshold doesn't + // matter anyway since the events will never be processed. + if (const RefPtr<AsyncPanZoomController>& apzc = GetTargetApzc()) { + threshold = aApzcCanConsumeEvents ? apzc->GetTouchStartTolerance() + : apzc->GetTouchMoveTolerance(); + } + bool stayInSlop = + (aInput.mType == MultiTouchInput::MULTITOUCH_MOVE) && + (aInput.mTouches.Length() == 1) && + ((aInput.mTouches[0].mScreenPoint - mSlopOrigin).Length() < threshold); + if (!stayInSlop) { + // we're out of the slop zone, and will stay out for the remainder of + // this block + TBS_LOG("%p exiting slop\n", this); + mInSlop = false; + } + } + return mInSlop; +} + +bool TouchBlockState::IsInSlop() const { return mInSlop; } + +Maybe<ScrollDirection> TouchBlockState::GetBestGuessPanDirection( + const MultiTouchInput& aInput) { + if (aInput.mType != MultiTouchInput::MULTITOUCH_MOVE || + aInput.mTouches.Length() != 1) { + return Nothing(); + } + ScreenPoint vector = aInput.mTouches[0].mScreenPoint - mSlopOrigin; + double angle = atan2(vector.y, vector.x); // range [-pi, pi] + angle = fabs(angle); // range [0, pi] + + double angleThreshold = TouchActionAllowsPanningXY() + ? StaticPrefs::apz_axis_lock_lock_angle() + : StaticPrefs::apz_axis_lock_direct_pan_angle(); + if (apz::IsCloseToHorizontal(angle, angleThreshold)) { + return Some(ScrollDirection::eHorizontal); + } + if (apz::IsCloseToVertical(angle, angleThreshold)) { + return Some(ScrollDirection::eVertical); + } + return Nothing(); +} + +uint32_t TouchBlockState::GetActiveTouchCount() const { + return mTouchCounter.GetActiveTouchCount(); +} + +KeyboardBlockState::KeyboardBlockState( + const RefPtr<AsyncPanZoomController>& aTargetApzc) + : InputBlockState(aTargetApzc, TargetConfirmationFlags{true}) {} + +} // namespace layers +} // namespace mozilla |