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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/MathAlgorithms.h"
#include "mozilla/dom/DataTransfer.h"
#include "nsCOMPtr.h"
#include "nsIDOMMouseEvent.h"
#include "nsIDOMWheelEvent.h"
/******************************************************************************
* nsDragDropEventStatus
******************************************************************************/
enum nsDragDropEventStatus
{
// The event is a enter
nsDragDropEventStatus_eDragEntered,
// The event is exit
nsDragDropEventStatus_eDragExited,
// The event is drop
nsDragDropEventStatus_eDrop
};
namespace mozilla {
namespace dom {
class PBrowserParent;
class PBrowserChild;
} // namespace dom
/******************************************************************************
* mozilla::WidgetPointerHelper
******************************************************************************/
class WidgetPointerHelper
{
public:
uint32_t pointerId;
uint32_t tiltX;
uint32_t tiltY;
bool convertToPointer;
bool retargetedByPointerCapture;
WidgetPointerHelper()
: pointerId(0)
, tiltX(0)
, tiltY(0)
, convertToPointer(true)
, retargetedByPointerCapture(false)
{
}
WidgetPointerHelper(uint32_t aPointerId, uint32_t aTiltX, uint32_t aTiltY)
: pointerId(aPointerId)
, tiltX(aTiltX)
, tiltY(aTiltY)
, convertToPointer(true)
, retargetedByPointerCapture(false)
{
}
void AssignPointerHelperData(const WidgetPointerHelper& aEvent)
{
pointerId = aEvent.pointerId;
tiltX = aEvent.tiltX;
tiltY = aEvent.tiltY;
convertToPointer = aEvent.convertToPointer;
retargetedByPointerCapture = aEvent.retargetedByPointerCapture;
}
};
/******************************************************************************
* mozilla::WidgetMouseEventBase
******************************************************************************/
class WidgetMouseEventBase : public WidgetInputEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
protected:
WidgetMouseEventBase()
: button(0)
, buttons(0)
, pressure(0)
, hitCluster(false)
, inputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
{
}
WidgetMouseEventBase(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget, EventClassID aEventClassID)
: WidgetInputEvent(aIsTrusted, aMessage, aWidget, aEventClassID)
, button(0)
, buttons(0)
, pressure(0)
, hitCluster(false)
, inputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
{
}
public:
virtual WidgetMouseEventBase* AsMouseEventBase() override { return this; }
virtual WidgetEvent* Duplicate() const override
{
MOZ_CRASH("WidgetMouseEventBase must not be most-subclass");
}
/// The possible related target
nsCOMPtr<nsISupports> relatedTarget;
enum buttonType
{
eNoButton = -1,
eLeftButton = 0,
eMiddleButton = 1,
eRightButton = 2
};
// Pressed button ID of mousedown or mouseup event.
// This is set only when pressing a button causes the event.
int16_t button;
enum buttonsFlag {
eNoButtonFlag = 0x00,
eLeftButtonFlag = 0x01,
eRightButtonFlag = 0x02,
eMiddleButtonFlag = 0x04,
// typicall, "back" button being left side of 5-button
// mice, see "buttons" attribute document of DOM3 Events.
e4thButtonFlag = 0x08,
// typicall, "forward" button being right side of 5-button
// mice, see "buttons" attribute document of DOM3 Events.
e5thButtonFlag = 0x10
};
// Flags of all pressed buttons at the event fired.
// This is set at any mouse event, don't be confused with |button|.
int16_t buttons;
// Finger or touch pressure of event. It ranges between 0.0 and 1.0.
float pressure;
// Touch near a cluster of links (true)
bool hitCluster;
// Possible values at nsIDOMMouseEvent
uint16_t inputSource;
// ID of the canvas HitRegion
nsString region;
bool IsLeftButtonPressed() const { return !!(buttons & eLeftButtonFlag); }
bool IsRightButtonPressed() const { return !!(buttons & eRightButtonFlag); }
bool IsMiddleButtonPressed() const { return !!(buttons & eMiddleButtonFlag); }
bool Is4thButtonPressed() const { return !!(buttons & e4thButtonFlag); }
bool Is5thButtonPressed() const { return !!(buttons & e5thButtonFlag); }
void AssignMouseEventBaseData(const WidgetMouseEventBase& aEvent,
bool aCopyTargets)
{
AssignInputEventData(aEvent, aCopyTargets);
relatedTarget = aCopyTargets ? aEvent.relatedTarget : nullptr;
button = aEvent.button;
buttons = aEvent.buttons;
pressure = aEvent.pressure;
hitCluster = aEvent.hitCluster;
inputSource = aEvent.inputSource;
}
/**
* Returns true if left click event.
*/
bool IsLeftClickEvent() const
{
return mMessage == eMouseClick && button == eLeftButton;
}
};
/******************************************************************************
* mozilla::WidgetMouseEvent
******************************************************************************/
class WidgetMouseEvent : public WidgetMouseEventBase
, public WidgetPointerHelper
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
public:
typedef bool ReasonType;
enum Reason : ReasonType
{
eReal,
eSynthesized
};
typedef bool ContextMenuTriggerType;
enum ContextMenuTrigger : ContextMenuTriggerType
{
eNormal,
eContextMenuKey
};
typedef bool ExitFromType;
enum ExitFrom : ExitFromType
{
eChild,
eTopLevel
};
protected:
WidgetMouseEvent()
: mReason(eReal)
, mContextMenuTrigger(eNormal)
, mExitFrom(eChild)
, mIgnoreRootScrollFrame(false)
, mClickCount(0)
{
}
WidgetMouseEvent(bool aIsTrusted,
EventMessage aMessage,
nsIWidget* aWidget,
EventClassID aEventClassID,
Reason aReason)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, aEventClassID)
, mReason(aReason)
, mContextMenuTrigger(eNormal)
, mExitFrom(eChild)
, mIgnoreRootScrollFrame(false)
, mClickCount(0)
{
}
public:
virtual WidgetMouseEvent* AsMouseEvent() override { return this; }
WidgetMouseEvent(bool aIsTrusted,
EventMessage aMessage,
nsIWidget* aWidget,
Reason aReason,
ContextMenuTrigger aContextMenuTrigger = eNormal)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, eMouseEventClass)
, mReason(aReason)
, mContextMenuTrigger(aContextMenuTrigger)
, mExitFrom(eChild)
, mIgnoreRootScrollFrame(false)
, mClickCount(0)
{
if (aMessage == eContextMenu) {
button = (mContextMenuTrigger == eNormal) ? eRightButton : eLeftButton;
}
}
#ifdef DEBUG
virtual ~WidgetMouseEvent()
{
NS_WARNING_ASSERTION(
mMessage != eContextMenu ||
button == ((mContextMenuTrigger == eNormal) ? eRightButton : eLeftButton),
"Wrong button set to eContextMenu event?");
}
#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);
result->AssignMouseEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// 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 is valid only when mMessage is eMouseExitFromWidget.
// This indicates if the mouse cursor exits from a top level widget or
// a child widget.
ExitFrom mExitFrom;
// Whether the event should ignore scroll frame bounds during dispatch.
bool mIgnoreRootScrollFrame;
// 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;
void AssignMouseEventData(const WidgetMouseEvent& aEvent, bool aCopyTargets)
{
AssignMouseEventBaseData(aEvent, aCopyTargets);
AssignPointerHelperData(aEvent);
mIgnoreRootScrollFrame = aEvent.mIgnoreRootScrollFrame;
mClickCount = aEvent.mClickCount;
}
/**
* 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;
}
};
/******************************************************************************
* mozilla::WidgetDragEvent
******************************************************************************/
class WidgetDragEvent : public WidgetMouseEvent
{
private:
friend class mozilla::dom::PBrowserParent;
friend class mozilla::dom::PBrowserChild;
protected:
WidgetDragEvent()
: mUserCancelled(false)
, mDefaultPreventedOnContent(false)
{
}
public:
virtual WidgetDragEvent* AsDragEvent() override { return this; }
WidgetDragEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget)
: WidgetMouseEvent(aIsTrusted, aMessage, aWidget, eDragEventClass, eReal)
, mUserCancelled(false)
, mDefaultPreventedOnContent(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);
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;
// 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;
}
};
/******************************************************************************
* 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)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget,
eMouseScrollEventClass)
, 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);
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
// nsIDOMUIEvent::SCROLL_PAGE_UP or nsIDOMUIEvent::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;
WidgetWheelEvent()
: mDeltaX(0.0)
, mDeltaY(0.0)
, mDeltaZ(0.0)
, mOverflowDeltaX(0.0)
, mOverflowDeltaY(0.0)
, mDeltaMode(nsIDOMWheelEvent::DOM_DELTA_PIXEL)
, mLineOrPageDeltaX(0)
, mLineOrPageDeltaY(0)
, mScrollType(SCROLL_DEFAULT)
, mCustomizedByUserPrefs(false)
, mIsMomentum(false)
, mIsNoLineOrPageDelta(false)
, mViewPortIsOverscrolled(false)
, mCanTriggerSwipe(false)
, mAllowToOverrideSystemScrollSpeed(false)
{
}
public:
virtual WidgetWheelEvent* AsWheelEvent() override { return this; }
WidgetWheelEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget)
: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, eWheelEventClass)
, mDeltaX(0.0)
, mDeltaY(0.0)
, mDeltaZ(0.0)
, mOverflowDeltaX(0.0)
, mOverflowDeltaY(0.0)
, mDeltaMode(nsIDOMWheelEvent::DOM_DELTA_PIXEL)
, mLineOrPageDeltaX(0)
, mLineOrPageDeltaY(0)
, mScrollType(SCROLL_DEFAULT)
, mCustomizedByUserPrefs(false)
, mMayHaveMomentum(false)
, mIsMomentum(false)
, mIsNoLineOrPageDelta(false)
, mViewPortIsOverscrolled(false)
, mCanTriggerSwipe(false)
, mAllowToOverrideSystemScrollSpeed(true)
{
}
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);
result->AssignWheelEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// On OS X, 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;
// overflowed delta values for scroll, these values are set by
// nsEventStateManger. If the default action of the wheel event isn't scroll,
// these values always zero. Otherwise, remaning 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 nsIDOMWheelEvent::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_ASYNCHRONOUSELY,
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;
void AssignWheelEventData(const WidgetWheelEvent& aEvent, bool aCopyTargets)
{
AssignMouseEventBaseData(aEvent, aCopyTargets);
mDeltaX = aEvent.mDeltaX;
mDeltaY = aEvent.mDeltaY;
mDeltaZ = aEvent.mDeltaZ;
mDeltaMode = aEvent.mDeltaMode;
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;
}
// 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;
WidgetPointerEvent()
: mWidth(1)
, mHeight(1)
, mIsPrimary(true)
{
}
public:
virtual WidgetPointerEvent* AsPointerEvent() override { return this; }
WidgetPointerEvent(bool aIsTrusted, EventMessage aMsg, nsIWidget* w)
: WidgetMouseEvent(aIsTrusted, aMsg, w, ePointerEventClass, eReal)
, mWidth(1)
, mHeight(1)
, mIsPrimary(true)
{
}
explicit WidgetPointerEvent(const WidgetMouseEvent& aEvent)
: WidgetMouseEvent(aEvent)
, mWidth(1)
, mHeight(1)
, mIsPrimary(true)
{
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);
result->AssignPointerEventData(*this, true);
result->mFlags = mFlags;
return result;
}
uint32_t mWidth;
uint32_t mHeight;
bool mIsPrimary;
// 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;
}
};
} // namespace mozilla
#endif // mozilla_MouseEvents_h__
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