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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef mozilla_layers_GeckoContentController_h
#define mozilla_layers_GeckoContentController_h
#include "FrameMetrics.h" // for FrameMetrics, etc
#include "InputData.h" // for PinchGestureInput
#include "Units.h" // for CSSPoint, CSSRect, etc
#include "mozilla/Assertions.h" // for MOZ_ASSERT_HELPER2
#include "mozilla/EventForwards.h" // for Modifiers
#include "nsISupportsImpl.h"
namespace mozilla {
class Runnable;
namespace layers {
class GeckoContentController
{
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GeckoContentController)
/**
* Requests a paint of the given FrameMetrics |aFrameMetrics| 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 FrameMetrics& aFrameMetrics) = 0;
/**
* Different types of tap-related events that can be sent in
* the HandleTap function. The names should be relatively self-explanatory.
* Note that the eLongTapUp will always be preceded by an eLongTap, but not
* all eLongTap notifications will be followed by an eLongTapUp (for instance,
* if the user moves their finger after triggering the long-tap but before
* lifting it).
* The difference between eDoubleTap and eSecondTap is subtle - the eDoubleTap
* is for an actual double-tap "gesture" while eSecondTap is for the same user
* input but where a double-tap gesture is not allowed. This is used to fire
* a click event with detail=2 to web content (similar to what a mouse double-
* click would do).
*/
enum class TapType {
eSingleTap,
eDoubleTap,
eSecondTap,
eLongTap,
eLongTapUp,
eSentinel,
};
/**
* 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) = 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.
* @param aType One of PINCHGESTURE_START, PINCHGESTURE_SCALE, or
* PINCHGESTURE_END, indicating the phase 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 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,
LayoutDeviceCoord aSpanChange,
Modifiers aModifiers) = 0;
/**
* Schedules a runnable to run on the controller/UI 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) = 0;
/**
* 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;
enum class APZStateChange {
/**
* APZ started modifying the view (including panning, zooming, and fling).
*/
eTransformBegin,
/**
* APZ finished modifying the view.
*/
eTransformEnd,
/**
* APZ started a touch.
* |aArg| is 1 if touch can be a pan, 0 otherwise.
*/
eStartTouch,
/**
* APZ started a pan.
*/
eStartPanning,
/**
* APZ finished processing a touch.
* |aArg| is 1 if touch was a click, 0 otherwise.
*/
eEndTouch,
// Sentinel value for IPC, this must be the last item in the enum and
// should not be used as an actual message value.
eSentinel
};
/**
* 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)
*/
virtual void NotifyAPZStateChange(const ScrollableLayerGuid& aGuid,
APZStateChange aChange,
int aArg = 0) {}
/**
* Notify content of a MozMouseScrollFailed event.
*/
virtual void NotifyMozMouseScrollEvent(const FrameMetrics::ViewID& aScrollId, const nsString& aEvent)
{}
/**
* Notify content that the repaint requests have been flushed.
*/
virtual void NotifyFlushComplete() = 0;
virtual void UpdateOverscrollVelocity(float aX, float aY, bool aIsRootContent) {}
virtual void UpdateOverscrollOffset(float aX, float aY, bool aIsRootContent) {}
virtual void SetScrollingRootContent(bool isRootContent) {}
GeckoContentController() {}
/**
* Needs to be called on the main thread.
*/
virtual void Destroy() {}
protected:
// Protected destructor, to discourage deletion outside of Release():
virtual ~GeckoContentController() {}
};
} // namespace layers
} // namespace mozilla
#endif // mozilla_layers_GeckoContentController_h
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