mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-12-25 06:29:21 +00:00
222 lines
8.1 KiB
C++
222 lines
8.1 KiB
C++
/* -*- 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/. */
|
|
|
|
#ifndef AccessibleCaretEventHub_h
|
|
#define AccessibleCaretEventHub_h
|
|
|
|
#include "mozilla/EventForwards.h"
|
|
#include "mozilla/UniquePtr.h"
|
|
#include "mozilla/WeakPtr.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsIFrame.h"
|
|
#include "nsIReflowObserver.h"
|
|
#include "nsIScrollObserver.h"
|
|
#include "nsISelectionListener.h"
|
|
#include "nsPoint.h"
|
|
#include "mozilla/RefPtr.h"
|
|
#include "nsWeakReference.h"
|
|
|
|
class nsDocShell;
|
|
class nsIPresShell;
|
|
class nsITimer;
|
|
|
|
namespace mozilla {
|
|
class AccessibleCaretManager;
|
|
class WidgetKeyboardEvent;
|
|
class WidgetMouseEvent;
|
|
class WidgetTouchEvent;
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// Each PresShell holds a shared pointer to an AccessibleCaretEventHub; each
|
|
// AccessibleCaretEventHub holds a unique pointer to an AccessibleCaretManager.
|
|
// Thus, there's one AccessibleCaretManager per PresShell.
|
|
//
|
|
// AccessibleCaretEventHub implements a state pattern. It receives events from
|
|
// PresShell and callbacks by observers and listeners, and then relays them to
|
|
// the current concrete state which calls necessary event-handling methods in
|
|
// AccessibleCaretManager.
|
|
//
|
|
// We separate AccessibleCaretEventHub from AccessibleCaretManager to make the
|
|
// state transitions in AccessibleCaretEventHub testable. We put (nearly) all
|
|
// the operations involving PresShell, Selection, and AccessibleCaret
|
|
// manipulation in AccessibleCaretManager so that we can mock methods in
|
|
// AccessibleCaretManager in gtest. We test the correctness of the state
|
|
// transitions by giving events, callbacks, and the return values by mocked
|
|
// methods of AccessibleCaretEventHub. See TestAccessibleCaretEventHub.cpp.
|
|
//
|
|
// Besides dealing with real events, AccessibleCaretEventHub could also
|
|
// synthesize fake long-tap events and inject those events to itself on the
|
|
// platform lacks eMouseLongTap. Turn on this preference
|
|
// "layout.accessiblecaret.use_long_tap_injector" for the fake long-tap events.
|
|
//
|
|
// State transition diagram:
|
|
// http://hg.mozilla.org/mozilla-central/raw-file/default/layout/base/doc/AccessibleCaretEventHubStates.png
|
|
// Source code of the diagram:
|
|
// http://hg.mozilla.org/mozilla-central/file/default/layout/base/doc/AccessibleCaretEventHubStates.dot
|
|
//
|
|
// Please see the wiki page for more information.
|
|
// https://wiki.mozilla.org/Copy_n_Paste
|
|
//
|
|
class AccessibleCaretEventHub : public nsIReflowObserver,
|
|
public nsIScrollObserver,
|
|
public nsISelectionListener,
|
|
public nsSupportsWeakReference
|
|
{
|
|
public:
|
|
explicit AccessibleCaretEventHub(nsIPresShell* aPresShell);
|
|
void Init();
|
|
void Terminate();
|
|
|
|
nsEventStatus HandleEvent(WidgetEvent* aEvent);
|
|
|
|
// Call this function to notify the blur event happened.
|
|
void NotifyBlur(bool aIsLeavingDocument);
|
|
|
|
NS_DECL_ISUPPORTS
|
|
NS_DECL_NSIREFLOWOBSERVER
|
|
NS_DECL_NSISELECTIONLISTENER
|
|
|
|
// Override nsIScrollObserver methods.
|
|
virtual void ScrollPositionChanged() override;
|
|
virtual void AsyncPanZoomStarted() override;
|
|
virtual void AsyncPanZoomStopped() override;
|
|
|
|
// Base state
|
|
class State;
|
|
State* GetState() const;
|
|
|
|
protected:
|
|
virtual ~AccessibleCaretEventHub();
|
|
|
|
#define MOZ_DECL_STATE_CLASS_GETTER(aClassName) \
|
|
class aClassName; \
|
|
static State* aClassName();
|
|
|
|
#define MOZ_IMPL_STATE_CLASS_GETTER(aClassName) \
|
|
AccessibleCaretEventHub::State* AccessibleCaretEventHub::aClassName() \
|
|
{ \
|
|
static class aClassName singleton; \
|
|
return &singleton; \
|
|
}
|
|
|
|
// Concrete state getters
|
|
MOZ_DECL_STATE_CLASS_GETTER(NoActionState)
|
|
MOZ_DECL_STATE_CLASS_GETTER(PressCaretState)
|
|
MOZ_DECL_STATE_CLASS_GETTER(DragCaretState)
|
|
MOZ_DECL_STATE_CLASS_GETTER(PressNoCaretState)
|
|
MOZ_DECL_STATE_CLASS_GETTER(ScrollState)
|
|
MOZ_DECL_STATE_CLASS_GETTER(PostScrollState)
|
|
MOZ_DECL_STATE_CLASS_GETTER(LongTapState)
|
|
|
|
void SetState(State* aState);
|
|
|
|
nsEventStatus HandleMouseEvent(WidgetMouseEvent* aEvent);
|
|
nsEventStatus HandleTouchEvent(WidgetTouchEvent* aEvent);
|
|
nsEventStatus HandleKeyboardEvent(WidgetKeyboardEvent* aEvent);
|
|
|
|
virtual nsPoint GetTouchEventPosition(WidgetTouchEvent* aEvent,
|
|
int32_t aIdentifier) const;
|
|
virtual nsPoint GetMouseEventPosition(WidgetMouseEvent* aEvent) const;
|
|
|
|
bool MoveDistanceIsLarge(const nsPoint& aPoint) const;
|
|
|
|
void LaunchLongTapInjector();
|
|
void CancelLongTapInjector();
|
|
static void FireLongTap(nsITimer* aTimer, void* aAccessibleCaretEventHub);
|
|
|
|
void LaunchScrollEndInjector();
|
|
void CancelScrollEndInjector();
|
|
static void FireScrollEnd(nsITimer* aTimer, void* aAccessibleCaretEventHub);
|
|
|
|
// Member variables
|
|
bool mInitialized = false;
|
|
|
|
State* mState = NoActionState();
|
|
|
|
// Will be set to nullptr in Terminate().
|
|
nsIPresShell* MOZ_NON_OWNING_REF mPresShell = nullptr;
|
|
|
|
UniquePtr<AccessibleCaretManager> mManager;
|
|
|
|
WeakPtr<nsDocShell> mDocShell;
|
|
|
|
// Use this timer for injecting a long tap event when APZ is disabled. If APZ
|
|
// is enabled, it will send long tap event to us.
|
|
nsCOMPtr<nsITimer> mLongTapInjectorTimer;
|
|
|
|
// Use this timer for injecting a simulated scroll end.
|
|
nsCOMPtr<nsITimer> mScrollEndInjectorTimer;
|
|
|
|
// Last mouse button down event or touch start event point.
|
|
nsPoint mPressPoint{ NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE };
|
|
|
|
// For filter multitouch event
|
|
int32_t mActiveTouchId = kInvalidTouchId;
|
|
|
|
// Simulate long tap if the platform does not support eMouseLongTap events.
|
|
static bool sUseLongTapInjector;
|
|
|
|
static const int32_t kScrollEndTimerDelay = 300;
|
|
static const int32_t kMoveStartToleranceInPixel = 5;
|
|
static const int32_t kInvalidTouchId = -1;
|
|
static const int32_t kDefaultTouchId = 0; // For mouse event
|
|
};
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// The base class for concrete states. A concrete state should inherit from this
|
|
// class, and override the methods to handle the events or callbacks. A concrete
|
|
// state is also responsible for transforming itself to the next concrete state.
|
|
//
|
|
class AccessibleCaretEventHub::State
|
|
{
|
|
public:
|
|
virtual const char* Name() const { return ""; }
|
|
|
|
virtual nsEventStatus OnPress(AccessibleCaretEventHub* aContext,
|
|
const nsPoint& aPoint, int32_t aTouchId)
|
|
{
|
|
return nsEventStatus_eIgnore;
|
|
}
|
|
|
|
virtual nsEventStatus OnMove(AccessibleCaretEventHub* aContext,
|
|
const nsPoint& aPoint)
|
|
{
|
|
return nsEventStatus_eIgnore;
|
|
}
|
|
|
|
virtual nsEventStatus OnRelease(AccessibleCaretEventHub* aContext)
|
|
{
|
|
return nsEventStatus_eIgnore;
|
|
}
|
|
|
|
virtual nsEventStatus OnLongTap(AccessibleCaretEventHub* aContext,
|
|
const nsPoint& aPoint)
|
|
{
|
|
return nsEventStatus_eIgnore;
|
|
}
|
|
|
|
virtual void OnScrollStart(AccessibleCaretEventHub* aContext) {}
|
|
virtual void OnScrollEnd(AccessibleCaretEventHub* aContext) {}
|
|
virtual void OnScrollPositionChanged(AccessibleCaretEventHub* aContext) {}
|
|
virtual void OnBlur(AccessibleCaretEventHub* aContext,
|
|
bool aIsLeavingDocument) {}
|
|
virtual void OnSelectionChanged(AccessibleCaretEventHub* aContext,
|
|
nsIDOMDocument* aDoc, nsISelection* aSel,
|
|
int16_t aReason) {}
|
|
virtual void OnReflow(AccessibleCaretEventHub* aContext) {}
|
|
virtual void Enter(AccessibleCaretEventHub* aContext) {}
|
|
virtual void Leave(AccessibleCaretEventHub* aContext) {}
|
|
|
|
explicit State() = default;
|
|
virtual ~State() = default;
|
|
State(const State&) = delete;
|
|
State& operator=(const State&) = delete;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // AccessibleCaretEventHub_h
|