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gecko-dev/widget/MouseEvents.h

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/* -*- Mode: C++; tab-width: 2; 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_MouseEvents_h__
#define mozilla_MouseEvents_h__
#include <stdint.h>
#include "mozilla/BasicEvents.h"
#include "mozilla/EventForwards.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/dom/DataTransfer.h"
#include "mozilla/ipc/IPCForwards.h"
#include "nsCOMPtr.h"
namespace mozilla {
namespace dom {
class PBrowserParent;
class PBrowserChild;
class PBrowserBridgeParent;
} // namespace dom
class WidgetPointerEvent;
} // namespace mozilla
namespace mozilla {
class WidgetPointerEventHolder final {
public:
nsTArray<WidgetPointerEvent> mEvents;
NS_INLINE_DECL_REFCOUNTING(WidgetPointerEventHolder)
private:
virtual ~WidgetPointerEventHolder() = default;
};
/******************************************************************************
* mozilla::WidgetPointerHelper
******************************************************************************/
class WidgetPointerHelper {
public:
uint32_t pointerId;
int32_t tiltX;
int32_t tiltY;
int32_t twist;
float tangentialPressure;
bool convertToPointer;
RefPtr<WidgetPointerEventHolder> mCoalescedWidgetEvents;
WidgetPointerHelper()
: pointerId(0),
tiltX(0),
tiltY(0),
twist(0),
tangentialPressure(0),
convertToPointer(true) {}
WidgetPointerHelper(uint32_t aPointerId, uint32_t aTiltX, uint32_t aTiltY,
uint32_t aTwist = 0, float aTangentialPressure = 0)
: pointerId(aPointerId),
tiltX(aTiltX),
tiltY(aTiltY),
twist(aTwist),
tangentialPressure(aTangentialPressure),
convertToPointer(true) {}
explicit WidgetPointerHelper(const WidgetPointerHelper& aHelper) = default;
void AssignPointerHelperData(const WidgetPointerHelper& aEvent,
bool aCopyCoalescedEvents = false) {
pointerId = aEvent.pointerId;
tiltX = aEvent.tiltX;
tiltY = aEvent.tiltY;
twist = aEvent.twist;
tangentialPressure = aEvent.tangentialPressure;
convertToPointer = aEvent.convertToPointer;
if (aCopyCoalescedEvents) {
mCoalescedWidgetEvents = aEvent.mCoalescedWidgetEvents;
}
}
};
/******************************************************************************
* mozilla::WidgetMouseEventBase
******************************************************************************/
class WidgetMouseEventBase : public WidgetInputEvent {
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
friend class dom::PBrowserBridgeParent;
ALLOW_DEPRECATED_READPARAM
protected:
WidgetMouseEventBase()
: mPressure(0),
mButton(0),
mButtons(0),
mInputSource(/* MouseEvent_Binding::MOZ_SOURCE_MOUSE = */ 1) {}
// Including MouseEventBinding.h here leads to an include loop, so
// we have to hardcode MouseEvent_Binding::MOZ_SOURCE_MOUSE.
WidgetMouseEventBase(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget, EventClassID aEventClassID,
const WidgetEventTime* aTime = nullptr)
: WidgetInputEvent(aIsTrusted, aMessage, aWidget, aEventClassID, aTime),
mPressure(0),
mButton(0),
mButtons(0),
mInputSource(/* MouseEvent_Binding::MOZ_SOURCE_MOUSE = */ 1) {}
// Including MouseEventBinding.h here leads to an include loop, so
// we have to hardcode MouseEvent_Binding::MOZ_SOURCE_MOUSE.
public:
virtual WidgetMouseEventBase* AsMouseEventBase() override { return this; }
virtual WidgetEvent* Duplicate() const override {
MOZ_CRASH("WidgetMouseEventBase must not be most-subclass");
}
// Finger or touch pressure of event. It ranges between 0.0 and 1.0.
float mPressure;
// Pressed button ID of mousedown or mouseup event.
// This is set only when pressing a button causes the event.
int16_t mButton;
// Flags of all pressed buttons at the event fired.
// This is set at any mouse event, don't be confused with |mButton|.
int16_t mButtons;
// Possible values a in MouseEvent
uint16_t mInputSource;
bool IsLeftButtonPressed() const {
return !!(mButtons & MouseButtonsFlag::ePrimaryFlag);
}
bool IsRightButtonPressed() const {
return !!(mButtons & MouseButtonsFlag::eSecondaryFlag);
}
bool IsMiddleButtonPressed() const {
return !!(mButtons & MouseButtonsFlag::eMiddleFlag);
}
bool Is4thButtonPressed() const {
return !!(mButtons & MouseButtonsFlag::e4thFlag);
}
bool Is5thButtonPressed() const {
return !!(mButtons & MouseButtonsFlag::e5thFlag);
}
void AssignMouseEventBaseData(const WidgetMouseEventBase& aEvent,
bool aCopyTargets) {
AssignInputEventData(aEvent, aCopyTargets);
mButton = aEvent.mButton;
mButtons = aEvent.mButtons;
mPressure = aEvent.mPressure;
mInputSource = aEvent.mInputSource;
}
/**
* Returns true if left click event.
*/
bool IsLeftClickEvent() const {
return mMessage == eMouseClick && mButton == MouseButton::ePrimary;
}
/**
* Returns true if this event changes a button state to "pressed".
*/
[[nodiscard]] bool IsPressingButton() const {
MOZ_ASSERT(IsTrusted());
if (mClass == eMouseEventClass) {
return mMessage == eMouseDown;
}
if (mButton == MouseButton::eNotPressed) {
return false;
}
// If this is an ePointerDown event whose mButton is not "not pressed", this
// is a button pressing event.
if (mMessage == ePointerDown) {
return true;
}
// If 2 or more buttons are pressed at same time, they are sent with
// pointermove rather than pointerdown. Therefore, let's check whether
// mButtons contains the proper flag for the pressing button.
const bool buttonsContainButton = !!(
mButtons & MouseButtonsFlagToChange(static_cast<MouseButton>(mButton)));
return mMessage == ePointerMove && buttonsContainButton;
}
/**
* Returns true if this event changes a button state to "released".
*/
[[nodiscard]] bool IsReleasingButton() const {
MOZ_ASSERT(IsTrusted());
if (mClass == eMouseEventClass) {
return mMessage == eMouseUp;
}
if (mButton == MouseButton::eNotPressed) {
return false;
}
// If this is an ePointerUp event whose mButton is not "not pressed", this
// is a button release event.
if (mMessage == ePointerUp) {
return true;
}
// If the releasing button is not the last button of pressing buttons, web
// apps notified by pointermove rather than pointerup. Therefore, let's
// check whether mButtons loses the proper flag for the releasing button.
const bool buttonsLoseTheButton = !(
mButtons & MouseButtonsFlagToChange(static_cast<MouseButton>(mButton)));
return mMessage == ePointerMove && buttonsLoseTheButton;
}
/**
* Returns true if the input source supports hover state like a mouse.
*/
[[nodiscard]] bool InputSourceSupportsHover() const;
};
/******************************************************************************
* mozilla::WidgetMouseEvent
******************************************************************************/
class WidgetMouseEvent : public WidgetMouseEventBase,
public WidgetPointerHelper {
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
friend class dom::PBrowserBridgeParent;
ALLOW_DEPRECATED_READPARAM
public:
typedef bool ReasonType;
enum Reason : ReasonType { eReal, eSynthesized };
typedef uint8_t ContextMenuTriggerType;
enum ContextMenuTrigger : ContextMenuTriggerType {
eNormal,
eContextMenuKey,
eControlClick
};
typedef uint8_t ExitFromType;
enum ExitFrom : ExitFromType {
ePlatformChild,
ePlatformTopLevel,
ePuppet,
ePuppetParentToPuppetChild
};
protected:
WidgetMouseEvent()
: mReason(eReal),
mContextMenuTrigger(eNormal),
mClickCount(0),
mIgnoreRootScrollFrame(false),
mClickEventPrevented(false) {}
WidgetMouseEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
EventClassID aEventClassID, Reason aReason,
const WidgetEventTime* aTime = nullptr)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, aEventClassID,
aTime),
mReason(aReason),
mContextMenuTrigger(eNormal),
mClickCount(0),
mIgnoreRootScrollFrame(false),
mClickEventPrevented(false) {}
#ifdef DEBUG
void AssertContextMenuEventButtonConsistency() const;
#endif
public:
virtual WidgetMouseEvent* AsMouseEvent() override { return this; }
WidgetMouseEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
Reason aReason,
ContextMenuTrigger aContextMenuTrigger = eNormal,
const WidgetEventTime* aTime = nullptr)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, eMouseEventClass,
aTime),
mReason(aReason),
mContextMenuTrigger(aContextMenuTrigger),
mClickCount(0),
mIgnoreRootScrollFrame(false),
mClickEventPrevented(false) {
if (aMessage == eContextMenu) {
mButton = (mContextMenuTrigger == eNormal) ? MouseButton::eSecondary
: MouseButton::ePrimary;
}
}
#ifdef DEBUG
virtual ~WidgetMouseEvent() { AssertContextMenuEventButtonConsistency(); }
#endif
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == eMouseEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetMouseEvent* result = new WidgetMouseEvent(
false, mMessage, nullptr, mReason, mContextMenuTrigger, this);
result->AssignMouseEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// If during mouseup handling we detect that click event might need to be
// dispatched, this is setup to be the target of the click event.
nsCOMPtr<dom::EventTarget> mClickTarget;
// mReason indicates the reason why the event is fired:
// - Representing mouse operation.
// - Synthesized for emulating mousemove event when the content under the
// mouse cursor is scrolled.
Reason mReason;
// mContextMenuTrigger is valid only when mMessage is eContextMenu.
// This indicates if the context menu event is caused by context menu key or
// other reasons (typically, a click of right mouse button).
ContextMenuTrigger mContextMenuTrigger;
// mExitFrom contains a value only when mMessage is eMouseExitFromWidget.
// This indicates if the mouse cursor exits from a top level platform widget,
// a child widget or a puppet widget.
Maybe<ExitFrom> mExitFrom;
// mClickCount may be non-zero value when mMessage is eMouseDown, eMouseUp,
// eMouseClick or eMouseDoubleClick. The number is count of mouse clicks.
// Otherwise, this must be 0.
uint32_t mClickCount;
// Whether the event should ignore scroll frame bounds during dispatch.
bool mIgnoreRootScrollFrame;
// Whether the event shouldn't cause click event.
bool mClickEventPrevented;
void AssignMouseEventData(const WidgetMouseEvent& aEvent, bool aCopyTargets) {
AssignMouseEventBaseData(aEvent, aCopyTargets);
AssignPointerHelperData(aEvent, /* aCopyCoalescedEvents */ true);
mExitFrom = aEvent.mExitFrom;
mClickCount = aEvent.mClickCount;
mIgnoreRootScrollFrame = aEvent.mIgnoreRootScrollFrame;
mClickEventPrevented = aEvent.mClickEventPrevented;
}
/**
* Returns true if the event is a context menu event caused by key.
*/
bool IsContextMenuKeyEvent() const {
return mMessage == eContextMenu && mContextMenuTrigger == eContextMenuKey;
}
/**
* Returns true if the event is a real mouse event. Otherwise, i.e., it's
* a synthesized event by scroll or something, returns false.
*/
bool IsReal() const { return mReason == eReal; }
/**
* Returns true if middle click paste is enabled.
*/
static bool IsMiddleClickPasteEnabled();
};
/******************************************************************************
* mozilla::WidgetDragEvent
******************************************************************************/
class WidgetDragEvent : public WidgetMouseEvent {
private:
friend class mozilla::dom::PBrowserParent;
friend class mozilla::dom::PBrowserChild;
ALLOW_DEPRECATED_READPARAM
protected:
WidgetDragEvent()
: mUserCancelled(false),
mDefaultPreventedOnContent(false),
mInHTMLEditorEventListener(false) {}
public:
virtual WidgetDragEvent* AsDragEvent() override { return this; }
WidgetDragEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
const WidgetEventTime* aTime = nullptr)
: WidgetMouseEvent(aIsTrusted, aMessage, aWidget, eDragEventClass, eReal,
aTime),
mUserCancelled(false),
mDefaultPreventedOnContent(false),
mInHTMLEditorEventListener(false) {}
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == eDragEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetDragEvent* result =
new WidgetDragEvent(false, mMessage, nullptr, this);
result->AssignDragEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// The dragging data.
nsCOMPtr<dom::DataTransfer> mDataTransfer;
// If this is true, user has cancelled the drag operation.
bool mUserCancelled;
// If this is true, the drag event's preventDefault() is called on content.
bool mDefaultPreventedOnContent;
// If this event is currently being handled by HTMLEditorEventListener.
bool mInHTMLEditorEventListener;
// XXX Not tested by test_assign_event_data.html
void AssignDragEventData(const WidgetDragEvent& aEvent, bool aCopyTargets) {
AssignMouseEventData(aEvent, aCopyTargets);
mDataTransfer = aEvent.mDataTransfer;
// XXX mUserCancelled isn't copied, is this intentionally?
mUserCancelled = false;
mDefaultPreventedOnContent = aEvent.mDefaultPreventedOnContent;
// XXX mInHTMLEditorEventListener isn't copied, is this intentionally?
mInHTMLEditorEventListener = false;
}
bool CanConvertToInputData() const {
return mMessage == eDragStart || mMessage == eDragEnd;
}
/**
* Should be called before dispatching the DOM tree if this event is
* synthesized for tests because drop effect is initialized before
* dispatching from widget if it's not synthesized event, but synthesized
* events are not initialized in the path.
*/
void InitDropEffectForTests();
};
/******************************************************************************
* mozilla::WidgetMouseScrollEvent
*
* This is used for legacy DOM mouse scroll events, i.e.,
* DOMMouseScroll and MozMousePixelScroll event. These events are NOT hanbled
* by ESM even if widget dispatches them. Use new WidgetWheelEvent instead.
******************************************************************************/
class WidgetMouseScrollEvent : public WidgetMouseEventBase {
private:
WidgetMouseScrollEvent() : mDelta(0), mIsHorizontal(false) {}
public:
virtual WidgetMouseScrollEvent* AsMouseScrollEvent() override { return this; }
WidgetMouseScrollEvent(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget,
const WidgetEventTime* aTime = nullptr)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget,
eMouseScrollEventClass, aTime),
mDelta(0),
mIsHorizontal(false) {}
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == eMouseScrollEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetMouseScrollEvent* result =
new WidgetMouseScrollEvent(false, mMessage, nullptr, this);
result->AssignMouseScrollEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// The delta value of mouse scroll event.
// If the event message is eLegacyMouseLineOrPageScroll, the value indicates
// scroll amount in lines. However, if the value is
// UIEvent::SCROLL_PAGE_UP or UIEvent::SCROLL_PAGE_DOWN, the
// value inducates one page scroll. If the event message is
// eLegacyMousePixelScroll, the value indicates scroll amount in pixels.
int32_t mDelta;
// If this is true, it may cause to scroll horizontally.
// Otherwise, vertically.
bool mIsHorizontal;
void AssignMouseScrollEventData(const WidgetMouseScrollEvent& aEvent,
bool aCopyTargets) {
AssignMouseEventBaseData(aEvent, aCopyTargets);
mDelta = aEvent.mDelta;
mIsHorizontal = aEvent.mIsHorizontal;
}
};
/******************************************************************************
* mozilla::WidgetWheelEvent
******************************************************************************/
class WidgetWheelEvent : public WidgetMouseEventBase {
private:
friend class mozilla::dom::PBrowserParent;
friend class mozilla::dom::PBrowserChild;
ALLOW_DEPRECATED_READPARAM
WidgetWheelEvent()
: mDeltaX(0.0),
mDeltaY(0.0),
mDeltaZ(0.0),
mOverflowDeltaX(0.0),
mOverflowDeltaY(0.0)
// Including WheelEventBinding.h here leads to an include loop, so
// we have to hardcode WheelEvent_Binding::DOM_DELTA_PIXEL.
,
mDeltaMode(/* WheelEvent_Binding::DOM_DELTA_PIXEL = */ 0),
mLineOrPageDeltaX(0),
mLineOrPageDeltaY(0),
mScrollType(SCROLL_DEFAULT),
mCustomizedByUserPrefs(false),
mMayHaveMomentum(false),
mIsMomentum(false),
mIsNoLineOrPageDelta(false),
mViewPortIsOverscrolled(false),
mCanTriggerSwipe(false),
mAllowToOverrideSystemScrollSpeed(false),
mDeltaValuesHorizontalizedForDefaultHandler(false) {}
public:
virtual WidgetWheelEvent* AsWheelEvent() override { return this; }
WidgetWheelEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
const WidgetEventTime* aTime = nullptr)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, eWheelEventClass,
aTime),
mDeltaX(0.0),
mDeltaY(0.0),
mDeltaZ(0.0),
mOverflowDeltaX(0.0),
mOverflowDeltaY(0.0)
// Including WheelEventBinding.h here leads to an include loop, so
// we have to hardcode WheelEvent_Binding::DOM_DELTA_PIXEL.
,
mDeltaMode(/* WheelEvent_Binding::DOM_DELTA_PIXEL = */ 0),
mLineOrPageDeltaX(0),
mLineOrPageDeltaY(0),
mScrollType(SCROLL_DEFAULT),
mCustomizedByUserPrefs(false),
mMayHaveMomentum(false),
mIsMomentum(false),
mIsNoLineOrPageDelta(false),
mViewPortIsOverscrolled(false),
mCanTriggerSwipe(false),
mAllowToOverrideSystemScrollSpeed(true),
mDeltaValuesHorizontalizedForDefaultHandler(false) {}
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == eWheelEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetWheelEvent* result =
new WidgetWheelEvent(false, mMessage, nullptr, this);
result->AssignWheelEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// Scroll gestures that start at the edge of the scrollable range can result
// in a swipe gesture. For the first wheel event of such a gesture, call
// TriggersSwipe() after the event has been processed in order to find out
// whether a swipe should be started.
bool TriggersSwipe() const {
return mCanTriggerSwipe && mViewPortIsOverscrolled &&
this->mOverflowDeltaX != 0.0;
}
// NOTE: mDeltaX, mDeltaY and mDeltaZ may be customized by
// mousewheel.*.delta_multiplier_* prefs which are applied by
// EventStateManager. So, after widget dispatches this event,
// these delta values may have different values than before.
double mDeltaX;
double mDeltaY;
double mDeltaZ;
// The mousewheel tick counts.
double mWheelTicksX = 0.0;
double mWheelTicksY = 0.0;
enum class DeltaModeCheckingState : uint8_t {
// Neither deltaMode nor the delta values have been accessed.
Unknown,
// The delta values have been accessed, without checking deltaMode first.
Unchecked,
// The deltaMode has been checked.
Checked,
};
// For compat reasons, we might expose a DOM_DELTA_LINE event as
// DOM_DELTA_PIXEL instead. Whether we do that depends on whether the event
// has been asked for the deltaMode before the deltas. If it has, we assume
// that the page will correctly handle DOM_DELTA_LINE. This variable tracks
// that state. See bug 1392460.
DeltaModeCheckingState mDeltaModeCheckingState =
DeltaModeCheckingState::Unknown;
// The amount of scrolling per line or page, without accounting for mouse
// wheel transactions etc.
//
// Computed by EventStateManager::DeltaAccumulator::InitLineOrPageDelta.
nsSize mScrollAmount;
// overflowed delta values for scroll, these values are set by
// EventStateManger. If the default action of the wheel event isn't scroll,
// these values are always zero. Otherwise, remaining delta values which are
// not used by scroll are set.
// NOTE: mDeltaX, mDeltaY and mDeltaZ may be modified by EventStateManager.
// However, mOverflowDeltaX and mOverflowDeltaY indicate unused original
// delta values which are not applied the delta_multiplier prefs.
// So, if widget wanted to know the actual direction to be scrolled,
// it would need to check the mDeltaX and mDeltaY.
double mOverflowDeltaX;
double mOverflowDeltaY;
// Should be one of WheelEvent_Binding::DOM_DELTA_*
uint32_t mDeltaMode;
// If widget sets mLineOrPageDelta, EventStateManager will dispatch
// eLegacyMouseLineOrPageScroll event for compatibility. Note that the delta
// value means pages if the mDeltaMode is DOM_DELTA_PAGE, otherwise, lines.
int32_t mLineOrPageDeltaX;
int32_t mLineOrPageDeltaY;
// When the default action for an wheel event is moving history or zooming,
// need to chose a delta value for doing it.
int32_t GetPreferredIntDelta() {
if (!mLineOrPageDeltaX && !mLineOrPageDeltaY) {
return 0;
}
if (mLineOrPageDeltaY && !mLineOrPageDeltaX) {
return mLineOrPageDeltaY;
}
if (mLineOrPageDeltaX && !mLineOrPageDeltaY) {
return mLineOrPageDeltaX;
}
if ((mLineOrPageDeltaX < 0 && mLineOrPageDeltaY > 0) ||
(mLineOrPageDeltaX > 0 && mLineOrPageDeltaY < 0)) {
return 0; // We cannot guess the answer in this case.
}
return (Abs(mLineOrPageDeltaX) > Abs(mLineOrPageDeltaY))
? mLineOrPageDeltaX
: mLineOrPageDeltaY;
}
// Scroll type
// The default value is SCROLL_DEFAULT, which means EventStateManager will
// select preferred scroll type automatically.
enum ScrollType : uint8_t {
SCROLL_DEFAULT,
SCROLL_SYNCHRONOUSLY,
SCROLL_ASYNCHRONOUSLY,
SCROLL_SMOOTHLY
};
ScrollType mScrollType;
// If the delta values are computed from prefs, this value is true.
// Otherwise, i.e., they are computed from native events, false.
bool mCustomizedByUserPrefs;
// true if the momentum events directly tied to this event may follow it.
bool mMayHaveMomentum;
// true if the event is caused by momentum.
bool mIsMomentum;
// If device event handlers don't know when they should set mLineOrPageDeltaX
// and mLineOrPageDeltaY, this is true. Otherwise, false.
// If mIsNoLineOrPageDelta is true, ESM will generate
// eLegacyMouseLineOrPageScroll events when accumulated delta values reach
// a line height.
bool mIsNoLineOrPageDelta;
// Whether or not the parent of the currently overscrolled frame is the
// ViewPort. This is false in situations when an element on the page is being
// overscrolled (such as a text field), but true when the 'page' is being
// overscrolled.
bool mViewPortIsOverscrolled;
// The wheel event can trigger a swipe to start if it's overscrolling the
// viewport.
bool mCanTriggerSwipe;
// If mAllowToOverrideSystemScrollSpeed is true, the scroll speed may be
// overridden. Otherwise, the scroll speed won't be overridden even if
// it's enabled by the pref.
bool mAllowToOverrideSystemScrollSpeed;
// After the event's default action handler has adjusted its delta's values
// for horizontalizing a vertical wheel scroll, this variable will be set to
// true.
bool mDeltaValuesHorizontalizedForDefaultHandler;
void AssignWheelEventData(const WidgetWheelEvent& aEvent, bool aCopyTargets) {
AssignMouseEventBaseData(aEvent, aCopyTargets);
mDeltaX = aEvent.mDeltaX;
mDeltaY = aEvent.mDeltaY;
mDeltaZ = aEvent.mDeltaZ;
mDeltaMode = aEvent.mDeltaMode;
mScrollAmount = aEvent.mScrollAmount;
mCustomizedByUserPrefs = aEvent.mCustomizedByUserPrefs;
mMayHaveMomentum = aEvent.mMayHaveMomentum;
mIsMomentum = aEvent.mIsMomentum;
mIsNoLineOrPageDelta = aEvent.mIsNoLineOrPageDelta;
mLineOrPageDeltaX = aEvent.mLineOrPageDeltaX;
mLineOrPageDeltaY = aEvent.mLineOrPageDeltaY;
mScrollType = aEvent.mScrollType;
mOverflowDeltaX = aEvent.mOverflowDeltaX;
mOverflowDeltaY = aEvent.mOverflowDeltaY;
mViewPortIsOverscrolled = aEvent.mViewPortIsOverscrolled;
mCanTriggerSwipe = aEvent.mCanTriggerSwipe;
mAllowToOverrideSystemScrollSpeed =
aEvent.mAllowToOverrideSystemScrollSpeed;
mDeltaValuesHorizontalizedForDefaultHandler =
aEvent.mDeltaValuesHorizontalizedForDefaultHandler;
}
// System scroll speed settings may be too slow at using Gecko. In such
// case, we should override the scroll speed computed with system settings.
// Following methods return preferred delta values which are multiplied by
// factors specified by prefs. If system scroll speed shouldn't be
// overridden (e.g., this feature is disabled by pref), they return raw
// delta values.
double OverriddenDeltaX() const;
double OverriddenDeltaY() const;
// Compute the overridden delta value. This may be useful for suppressing
// too fast scroll by system scroll speed overriding when widget sets
// mAllowToOverrideSystemScrollSpeed.
static double ComputeOverriddenDelta(double aDelta, bool aIsForVertical);
private:
static bool sInitialized;
static bool sIsSystemScrollSpeedOverrideEnabled;
static int32_t sOverrideFactorX;
static int32_t sOverrideFactorY;
static void Initialize();
};
/******************************************************************************
* mozilla::WidgetPointerEvent
******************************************************************************/
class WidgetPointerEvent : public WidgetMouseEvent {
friend class mozilla::dom::PBrowserParent;
friend class mozilla::dom::PBrowserChild;
ALLOW_DEPRECATED_READPARAM
public:
virtual WidgetPointerEvent* AsPointerEvent() override { return this; }
WidgetPointerEvent(bool aIsTrusted, EventMessage aMsg, nsIWidget* w,
const WidgetEventTime* aTime = nullptr)
: WidgetMouseEvent(aIsTrusted, aMsg, w, ePointerEventClass, eReal, aTime),
mWidth(1),
mHeight(1),
mIsPrimary(true),
mFromTouchEvent(false) {}
explicit WidgetPointerEvent(const WidgetMouseEvent& aEvent)
: WidgetMouseEvent(aEvent),
mWidth(1),
mHeight(1),
mIsPrimary(true),
mFromTouchEvent(false) {
mClass = ePointerEventClass;
}
virtual WidgetEvent* Duplicate() const override {
MOZ_ASSERT(mClass == ePointerEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetPointerEvent* result =
new WidgetPointerEvent(false, mMessage, nullptr, this);
result->AssignPointerEventData(*this, true);
result->mFlags = mFlags;
return result;
}
int32_t mWidth;
int32_t mHeight;
bool mIsPrimary;
bool mFromTouchEvent;
// XXX Not tested by test_assign_event_data.html
void AssignPointerEventData(const WidgetPointerEvent& aEvent,
bool aCopyTargets) {
AssignMouseEventData(aEvent, aCopyTargets);
mWidth = aEvent.mWidth;
mHeight = aEvent.mHeight;
mIsPrimary = aEvent.mIsPrimary;
mFromTouchEvent = aEvent.mFromTouchEvent;
}
};
} // namespace mozilla
#endif // mozilla_MouseEvents_h__
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