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/* -*- 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 "InputData.h" // for MouseInput, etc
#include "InputBlockState.h" // for InputBlockState
#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) {}
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) {
APZThreadUtils::AssertOnControllerThread();
APZEventResult result;
switch (aEvent.mClass) {
case eMouseEventClass:
case eDragEventClass: {
WidgetMouseEvent& mouseEvent = *aEvent.AsMouseEvent();
// Note, we call this before having transformed the reference point.
if (mouseEvent.IsReal()) {
UpdateWheelTransaction(mouseEvent.mRefPoint, mouseEvent.mMessage);
}
if (WillHandleMouseEvent(mouseEvent)) {
MouseInput input(mouseEvent);
input.mOrigin =
ScreenPoint(mouseEvent.mRefPoint.x, mouseEvent.mRefPoint.y);
result = ReceiveInputEvent(input);
mouseEvent.mRefPoint.x = input.mOrigin.x;
mouseEvent.mRefPoint.y = input.mOrigin.y;
mouseEvent.mFlags.mHandledByAPZ = input.mHandledByAPZ;
mouseEvent.mFocusSequenceNumber = input.mFocusSequenceNumber;
aEvent.mLayersId = input.mLayersId;
return result;
}
ProcessUnhandledEvent(&mouseEvent.mRefPoint, &result.mTargetGuid,
&aEvent.mFocusSequenceNumber, &aEvent.mLayersId);
return result;
}
case eTouchEventClass: {
WidgetTouchEvent& touchEvent = *aEvent.AsTouchEvent();
MultiTouchInput touchInput(touchEvent);
result = ReceiveInputEvent(touchInput);
// 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.mTime, 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);
wheelEvent.mRefPoint.x = input.mOrigin.x;
wheelEvent.mRefPoint.y = input.mOrigin.y;
wheelEvent.mFlags.mHandledByAPZ = input.mHandledByAPZ;
wheelEvent.mFocusSequenceNumber = input.mFocusSequenceNumber;
aEvent.mLayersId = input.mLayersId;
return result;
}
}
UpdateWheelTransaction(aEvent.mRefPoint, aEvent.mMessage);
ProcessUnhandledEvent(&aEvent.mRefPoint, &result.mTargetGuid,
&aEvent.mFocusSequenceNumber, &aEvent.mLayersId);
result.mStatus = nsEventStatus_eIgnore;
return result;
}
case eKeyboardEventClass: {
WidgetKeyboardEvent& keyboardEvent = *aEvent.AsKeyboardEvent();
KeyboardInput input(keyboardEvent);
result = ReceiveInputEvent(input);
keyboardEvent.mFlags.mHandledByAPZ = input.mHandledByAPZ;
keyboardEvent.mFocusSequenceNumber = input.mFocusSequenceNumber;
return result;
}
default: {
UpdateWheelTransaction(aEvent.mRefPoint, aEvent.mMessage);
ProcessUnhandledEvent(&aEvent.mRefPoint, &result.mTargetGuid,
&aEvent.mFocusSequenceNumber, &aEvent.mLayersId);
return result;
}
}
MOZ_ASSERT_UNREACHABLE("Invalid WidgetInputEvent type.");
result.mStatus = nsEventStatus_eConsumeNoDefault;
return result;
}
std::ostream& operator<<(std::ostream& aOut,
const APZHandledResult& aHandledResult) {
switch (aHandledResult) {
case APZHandledResult::Unhandled:
aOut << "unhandled";
break;
case APZHandledResult::HandledByRoot: {
aOut << "handled-by-root";
break;
}
case APZHandledResult::HandledByContent: {
aOut << "handled-by-content";
break;
}
case APZHandledResult::Invalid: {
aOut << "INVALID";
break;
}
}
return aOut;
}
} // namespace layers
} // namespace mozilla
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