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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 */
#ifndef mozilla_layers_GeckoContentController_h
#define mozilla_layers_GeckoContentController_h
#include "GeckoContentControllerTypes.h"
#include "InputData.h" // for PinchGestureInput
#include "LayersTypes.h" // for ScrollDirection
#include "Units.h" // for CSSPoint, CSSRect, etc
#include "mozilla/Assertions.h" // for MOZ_ASSERT_HELPER2
#include "mozilla/Attributes.h" // for MOZ_CAN_RUN_SCRIPT
#include "mozilla/DefineEnum.h" // for MOZ_DEFINE_ENUM
#include "mozilla/EventForwards.h" // for Modifiers
#include "mozilla/layers/APZThreadUtils.h"
#include "mozilla/layers/MatrixMessage.h" // for MatrixMessage
#include "mozilla/layers/ScrollableLayerGuid.h" // for ScrollableLayerGuid, etc
#include "nsISupportsImpl.h"
namespace mozilla {
class Runnable;
namespace layers {
struct DoubleTapToZoomMetrics;
struct RepaintRequest;
class GeckoContentController {
using APZStateChange = GeckoContentController_APZStateChange;
using TapType = GeckoContentController_TapType;
* Notifies the content side of the most recently computed transforms for
* each layers subtree to the root. The nsTArray will contain one
* MatrixMessage for each layers id in the current APZ tree, along with the
* corresponding transform.
virtual void NotifyLayerTransforms(nsTArray<MatrixMessage>&& aTransforms) = 0;
* Requests a paint of the given RepaintRequest |aRequest| from Gecko.
* Implementations per-platform are responsible for actually handling this.
* This method must always be called on the repaint thread, which depends
* on the GeckoContentController. For ChromeProcessController it is the
* Gecko main thread, while for RemoteContentController it is the compositor
* thread where it can send IPDL messages.
virtual void RequestContentRepaint(const RepaintRequest& aRequest) = 0;
* Requests handling of a tap event. |aPoint| is in LD pixels, relative to the
* current scroll offset.
virtual void HandleTap(
TapType aType, const LayoutDevicePoint& aPoint, Modifiers aModifiers,
const ScrollableLayerGuid& aGuid, uint64_t aInputBlockId,
const Maybe<DoubleTapToZoomMetrics>& aDoubleTapTooZoomMetrics) = 0;
* When the apz.allow_zooming pref is set to false, the APZ will not
* translate pinch gestures to actual zooming. Instead, it will call this
* method to notify gecko of the pinch gesture, and allow it to deal with it
* however it wishes. Note that this function is not called if the pinch is
* prevented by content calling preventDefault() on the touch events, or via
* use of the touch-action property.
* of the pinch.
* @param aGuid The guid of the APZ that is detecting the pinch. This is
* generally the root APZC for the layers id.
* @param aFocusPoint The focus point of the pinch event.
* @param aSpanChange For the START or END event, this is always 0.
* For a SCALE event, this is the difference in span between the
* previous state and the new state.
* @param aModifiers The keyboard modifiers depressed during the pinch.
virtual void NotifyPinchGesture(PinchGestureInput::PinchGestureType aType,
const ScrollableLayerGuid& aGuid,
const LayoutDevicePoint& aFocusPoint,
LayoutDeviceCoord aSpanChange,
Modifiers aModifiers) = 0;
* Schedules a runnable to run on the controller thread at some time
* in the future.
* This method must always be called on the controller thread.
virtual void PostDelayedTask(already_AddRefed<Runnable> aRunnable,
int aDelayMs) {
APZThreadUtils::DelayedDispatch(std::move(aRunnable), aDelayMs);
* Returns true if we are currently on the thread that can send repaint
* requests.
virtual bool IsRepaintThread() = 0;
* Runs the given task on the "repaint" thread.
virtual void DispatchToRepaintThread(already_AddRefed<Runnable> aTask) = 0;
* General notices of APZ state changes for consumers.
* |aGuid| identifies the APZC originating the state change.
* |aChange| identifies the type of state change
* |aArg| is used by some state changes to pass extra information (see
* the documentation for each state change above)
* |aInputBlockId| is populated for the |eStartTouch| and |eEndTouch|
* state changes and identifies the input block of the
* gesture that triggers the state change.
virtual void NotifyAPZStateChange(const ScrollableLayerGuid& aGuid,
APZStateChange aChange, int aArg = 0,
Maybe<uint64_t> aInputBlockId = Nothing()) {
* Notify content of a MozMouseScrollFailed event.
virtual void NotifyMozMouseScrollEvent(
const ScrollableLayerGuid::ViewID& aScrollId, const nsString& aEvent) {}
* Notify content that the repaint requests have been flushed.
virtual void NotifyFlushComplete() = 0;
* If the async scrollbar-drag initiation code kicks in on the APZ side, then
* we need to let content know that we are dragging the scrollbar. Otherwise,
* by the time the mousedown events is handled by content, the scrollthumb
* could already have been moved via a RequestContentRepaint message at a
* new scroll position, and the mousedown might end up triggering a click-to-
* scroll on where the thumb used to be.
virtual void NotifyAsyncScrollbarDragInitiated(
uint64_t aDragBlockId, const ScrollableLayerGuid::ViewID& aScrollId,
ScrollDirection aDirection) = 0;
virtual void NotifyAsyncScrollbarDragRejected(
const ScrollableLayerGuid::ViewID& aScrollId) = 0;
virtual void NotifyAsyncAutoscrollRejected(
const ScrollableLayerGuid::ViewID& aScrollId) = 0;
virtual void CancelAutoscroll(const ScrollableLayerGuid& aGuid) = 0;
virtual void NotifyScaleGestureComplete(const ScrollableLayerGuid& aGuid,
float aScale) = 0;
virtual void UpdateOverscrollVelocity(const ScrollableLayerGuid& aGuid,
float aX, float aY,
bool aIsRootContent) {}
virtual void UpdateOverscrollOffset(const ScrollableLayerGuid& aGuid,
float aX, float aY, bool aIsRootContent) {
GeckoContentController() = default;
* Needs to be called on the main thread.
virtual void Destroy() {}
* Whether this is RemoteContentController.
virtual bool IsRemote() { return false; }
virtual PresShell* GetTopLevelPresShell() const { return nullptr; };
// Protected destructor, to discourage deletion outside of Release():
virtual ~GeckoContentController() = default;
} // namespace layers
} // namespace mozilla
#endif // mozilla_layers_GeckoContentController_h