зеркало из https://github.com/mozilla/gecko-dev.git
710 строки
22 KiB
C++
710 строки
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_MouseEvents_h__
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#define mozilla_MouseEvents_h__
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#include <stdint.h>
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#include "mozilla/BasicEvents.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/dom/DataTransfer.h"
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#include "nsCOMPtr.h"
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#include "nsIDOMMouseEvent.h"
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#include "nsIDOMWheelEvent.h"
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/******************************************************************************
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* nsDragDropEventStatus
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******************************************************************************/
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enum nsDragDropEventStatus
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{
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// The event is a enter
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nsDragDropEventStatus_eDragEntered,
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// The event is exit
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nsDragDropEventStatus_eDragExited,
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// The event is drop
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nsDragDropEventStatus_eDrop
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};
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namespace mozilla {
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namespace dom {
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class PBrowserParent;
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class PBrowserChild;
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} // namespace dom
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/******************************************************************************
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* mozilla::WidgetPointerHelper
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******************************************************************************/
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class WidgetPointerHelper
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{
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public:
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bool convertToPointer;
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uint32_t pointerId;
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uint32_t tiltX;
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uint32_t tiltY;
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bool retargetedByPointerCapture;
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WidgetPointerHelper() : convertToPointer(true), pointerId(0), tiltX(0), tiltY(0),
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retargetedByPointerCapture(false) {}
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void AssignPointerHelperData(const WidgetPointerHelper& aEvent)
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{
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convertToPointer = aEvent.convertToPointer;
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pointerId = aEvent.pointerId;
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tiltX = aEvent.tiltX;
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tiltY = aEvent.tiltY;
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retargetedByPointerCapture = aEvent.retargetedByPointerCapture;
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}
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};
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/******************************************************************************
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* mozilla::WidgetMouseEventBase
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******************************************************************************/
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class WidgetMouseEventBase : public WidgetInputEvent
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{
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private:
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friend class dom::PBrowserParent;
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friend class dom::PBrowserChild;
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protected:
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WidgetMouseEventBase()
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: button(0)
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, buttons(0)
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, pressure(0)
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, hitCluster(false)
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, inputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
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{
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}
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WidgetMouseEventBase(bool aIsTrusted, EventMessage aMessage,
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nsIWidget* aWidget, EventClassID aEventClassID)
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: WidgetInputEvent(aIsTrusted, aMessage, aWidget, aEventClassID)
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, button(0)
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, buttons(0)
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, pressure(0)
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, hitCluster(false)
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, inputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
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{
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}
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public:
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virtual WidgetMouseEventBase* AsMouseEventBase() override { return this; }
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virtual WidgetEvent* Duplicate() const override
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{
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MOZ_CRASH("WidgetMouseEventBase must not be most-subclass");
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}
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/// The possible related target
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nsCOMPtr<nsISupports> relatedTarget;
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enum buttonType
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{
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eLeftButton = 0,
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eMiddleButton = 1,
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eRightButton = 2
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};
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// Pressed button ID of mousedown or mouseup event.
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// This is set only when pressing a button causes the event.
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int16_t button;
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enum buttonsFlag {
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eNoButtonFlag = 0x00,
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eLeftButtonFlag = 0x01,
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eRightButtonFlag = 0x02,
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eMiddleButtonFlag = 0x04,
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// typicall, "back" button being left side of 5-button
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// mice, see "buttons" attribute document of DOM3 Events.
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e4thButtonFlag = 0x08,
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// typicall, "forward" button being right side of 5-button
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// mice, see "buttons" attribute document of DOM3 Events.
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e5thButtonFlag = 0x10
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};
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// Flags of all pressed buttons at the event fired.
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// This is set at any mouse event, don't be confused with |button|.
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int16_t buttons;
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// Finger or touch pressure of event. It ranges between 0.0 and 1.0.
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float pressure;
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// Touch near a cluster of links (true)
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bool hitCluster;
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// Possible values at nsIDOMMouseEvent
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uint16_t inputSource;
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// ID of the canvas HitRegion
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nsString region;
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bool IsLeftButtonPressed() const { return !!(buttons & eLeftButtonFlag); }
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bool IsRightButtonPressed() const { return !!(buttons & eRightButtonFlag); }
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bool IsMiddleButtonPressed() const { return !!(buttons & eMiddleButtonFlag); }
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bool Is4thButtonPressed() const { return !!(buttons & e4thButtonFlag); }
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bool Is5thButtonPressed() const { return !!(buttons & e5thButtonFlag); }
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void AssignMouseEventBaseData(const WidgetMouseEventBase& aEvent,
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bool aCopyTargets)
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{
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AssignInputEventData(aEvent, aCopyTargets);
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relatedTarget = aCopyTargets ? aEvent.relatedTarget : nullptr;
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button = aEvent.button;
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buttons = aEvent.buttons;
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pressure = aEvent.pressure;
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hitCluster = aEvent.hitCluster;
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inputSource = aEvent.inputSource;
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}
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/**
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* Returns true if left click event.
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*/
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bool IsLeftClickEvent() const
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{
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return mMessage == eMouseClick && button == eLeftButton;
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}
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};
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/******************************************************************************
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* mozilla::WidgetMouseEvent
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******************************************************************************/
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class WidgetMouseEvent : public WidgetMouseEventBase, public WidgetPointerHelper
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{
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private:
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friend class mozilla::dom::PBrowserParent;
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friend class mozilla::dom::PBrowserChild;
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public:
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typedef bool ReasonType;
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enum Reason : ReasonType
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{
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eReal,
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eSynthesized
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};
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typedef bool ContextMenuTriggerType;
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enum ContextMenuTrigger : ContextMenuTriggerType
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{
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eNormal,
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eContextMenuKey
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};
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typedef bool ExitFromType;
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enum ExitFrom : ExitFromType
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{
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eChild,
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eTopLevel
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};
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protected:
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WidgetMouseEvent()
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: mReason(eReal)
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, mContextMenuTrigger(eNormal)
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, mExitFrom(eChild)
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, mIgnoreRootScrollFrame(false)
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, mClickCount(0)
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{
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}
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WidgetMouseEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget,
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EventClassID aEventClassID, Reason aReason)
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: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, aEventClassID)
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, mReason(aReason)
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, mContextMenuTrigger(eNormal)
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, mExitFrom(eChild)
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, mIgnoreRootScrollFrame(false)
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, mClickCount(0)
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{
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}
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public:
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virtual WidgetMouseEvent* AsMouseEvent() override { return this; }
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WidgetMouseEvent(bool aIsTrusted,
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EventMessage aMessage,
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nsIWidget* aWidget,
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Reason aReason,
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ContextMenuTrigger aContextMenuTrigger = eNormal)
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: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, eMouseEventClass)
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, mReason(aReason)
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, mContextMenuTrigger(aContextMenuTrigger)
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, mExitFrom(eChild)
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, mIgnoreRootScrollFrame(false)
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, mClickCount(0)
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{
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if (aMessage == eContextMenu) {
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button = (mContextMenuTrigger == eNormal) ? eRightButton : eLeftButton;
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}
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}
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#ifdef DEBUG
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virtual ~WidgetMouseEvent()
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{
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NS_WARN_IF_FALSE(mMessage != eContextMenu ||
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button ==
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((mContextMenuTrigger == eNormal) ? eRightButton :
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eLeftButton),
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"Wrong button set to eContextMenu event?");
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}
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#endif
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virtual WidgetEvent* Duplicate() const override
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{
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MOZ_ASSERT(mClass == eMouseEventClass,
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"Duplicate() must be overridden by sub class");
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// Not copying widget, it is a weak reference.
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WidgetMouseEvent* result =
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new WidgetMouseEvent(false, mMessage, nullptr,
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mReason, mContextMenuTrigger);
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result->AssignMouseEventData(*this, true);
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result->mFlags = mFlags;
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return result;
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}
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Reason mReason;
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ContextMenuTrigger mContextMenuTrigger;
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ExitFrom mExitFrom;
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// Whether the event should ignore scroll frame bounds during dispatch.
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bool mIgnoreRootScrollFrame;
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/// The number of mouse clicks.
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uint32_t mClickCount;
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void AssignMouseEventData(const WidgetMouseEvent& aEvent, bool aCopyTargets)
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{
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AssignMouseEventBaseData(aEvent, aCopyTargets);
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AssignPointerHelperData(aEvent);
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mIgnoreRootScrollFrame = aEvent.mIgnoreRootScrollFrame;
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mClickCount = aEvent.mClickCount;
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}
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/**
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* Returns true if the event is a context menu event caused by key.
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*/
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bool IsContextMenuKeyEvent() const
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{
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return mMessage == eContextMenu && mContextMenuTrigger == eContextMenuKey;
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}
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/**
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* Returns true if the event is a real mouse event. Otherwise, i.e., it's
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* a synthesized event by scroll or something, returns false.
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*/
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bool IsReal() const
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{
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return mReason == eReal;
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}
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};
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/******************************************************************************
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* mozilla::WidgetDragEvent
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******************************************************************************/
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class WidgetDragEvent : public WidgetMouseEvent
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{
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private:
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friend class mozilla::dom::PBrowserParent;
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friend class mozilla::dom::PBrowserChild;
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protected:
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WidgetDragEvent()
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: mUserCancelled(false)
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, mDefaultPreventedOnContent(false)
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{
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}
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public:
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virtual WidgetDragEvent* AsDragEvent() override { return this; }
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WidgetDragEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget)
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: WidgetMouseEvent(aIsTrusted, aMessage, aWidget, eDragEventClass, eReal)
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, mUserCancelled(false)
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, mDefaultPreventedOnContent(false)
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{
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}
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virtual WidgetEvent* Duplicate() const override
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{
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MOZ_ASSERT(mClass == eDragEventClass,
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"Duplicate() must be overridden by sub class");
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// Not copying widget, it is a weak reference.
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WidgetDragEvent* result = new WidgetDragEvent(false, mMessage, nullptr);
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result->AssignDragEventData(*this, true);
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result->mFlags = mFlags;
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return result;
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}
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// The dragging data.
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nsCOMPtr<dom::DataTransfer> mDataTransfer;
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// If this is true, user has cancelled the drag operation.
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bool mUserCancelled;
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// If this is true, the drag event's preventDefault() is called on content.
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bool mDefaultPreventedOnContent;
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// XXX Not tested by test_assign_event_data.html
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void AssignDragEventData(const WidgetDragEvent& aEvent, bool aCopyTargets)
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{
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AssignMouseEventData(aEvent, aCopyTargets);
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mDataTransfer = aEvent.mDataTransfer;
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// XXX mUserCancelled isn't copied, is this intentionally?
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mUserCancelled = false;
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mDefaultPreventedOnContent = aEvent.mDefaultPreventedOnContent;
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}
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};
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/******************************************************************************
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* mozilla::WidgetMouseScrollEvent
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*
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* This is used for legacy DOM mouse scroll events, i.e.,
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* DOMMouseScroll and MozMousePixelScroll event. These events are NOT hanbled
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* by ESM even if widget dispatches them. Use new WidgetWheelEvent instead.
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******************************************************************************/
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class WidgetMouseScrollEvent : public WidgetMouseEventBase
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{
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private:
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WidgetMouseScrollEvent()
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: mDelta(0)
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, mIsHorizontal(false)
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{
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}
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public:
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virtual WidgetMouseScrollEvent* AsMouseScrollEvent() override
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{
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return this;
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}
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WidgetMouseScrollEvent(bool aIsTrusted, EventMessage aMessage,
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nsIWidget* aWidget)
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: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget,
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eMouseScrollEventClass)
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, mDelta(0)
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, mIsHorizontal(false)
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{
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}
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virtual WidgetEvent* Duplicate() const override
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{
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MOZ_ASSERT(mClass == eMouseScrollEventClass,
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"Duplicate() must be overridden by sub class");
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// Not copying widget, it is a weak reference.
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WidgetMouseScrollEvent* result =
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new WidgetMouseScrollEvent(false, mMessage, nullptr);
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result->AssignMouseScrollEventData(*this, true);
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result->mFlags = mFlags;
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return result;
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}
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// The delta value of mouse scroll event.
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// If the event message is eLegacyMouseLineOrPageScroll, the value indicates
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// scroll amount in lines. However, if the value is
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// nsIDOMUIEvent::SCROLL_PAGE_UP or nsIDOMUIEvent::SCROLL_PAGE_DOWN, the
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// value inducates one page scroll. If the event message is
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// eLegacyMousePixelScroll, the value indicates scroll amount in pixels.
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int32_t mDelta;
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// If this is true, it may cause to scroll horizontally.
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// Otherwise, vertically.
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bool mIsHorizontal;
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void AssignMouseScrollEventData(const WidgetMouseScrollEvent& aEvent,
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bool aCopyTargets)
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{
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AssignMouseEventBaseData(aEvent, aCopyTargets);
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mDelta = aEvent.mDelta;
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mIsHorizontal = aEvent.mIsHorizontal;
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}
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};
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/******************************************************************************
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* mozilla::WidgetWheelEvent
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******************************************************************************/
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class WidgetWheelEvent : public WidgetMouseEventBase
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{
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private:
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friend class mozilla::dom::PBrowserParent;
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friend class mozilla::dom::PBrowserChild;
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WidgetWheelEvent()
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: mDeltaX(0.0)
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, mDeltaY(0.0)
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, mDeltaZ(0.0)
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, mOverflowDeltaX(0.0)
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, mOverflowDeltaY(0.0)
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, mDeltaMode(nsIDOMWheelEvent::DOM_DELTA_PIXEL)
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, mLineOrPageDeltaX(0)
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, mLineOrPageDeltaY(0)
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, mScrollType(SCROLL_DEFAULT)
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, mCustomizedByUserPrefs(false)
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, mIsMomentum(false)
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, mIsNoLineOrPageDelta(false)
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, mViewPortIsOverscrolled(false)
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, mCanTriggerSwipe(false)
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, mAllowToOverrideSystemScrollSpeed(false)
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{
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}
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public:
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virtual WidgetWheelEvent* AsWheelEvent() override { return this; }
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WidgetWheelEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget)
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: WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, eWheelEventClass)
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, mDeltaX(0.0)
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, mDeltaY(0.0)
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, mDeltaZ(0.0)
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, mOverflowDeltaX(0.0)
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, mOverflowDeltaY(0.0)
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, mDeltaMode(nsIDOMWheelEvent::DOM_DELTA_PIXEL)
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, mLineOrPageDeltaX(0)
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, mLineOrPageDeltaY(0)
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, mScrollType(SCROLL_DEFAULT)
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, mCustomizedByUserPrefs(false)
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, mMayHaveMomentum(false)
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, mIsMomentum(false)
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, mIsNoLineOrPageDelta(false)
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, mViewPortIsOverscrolled(false)
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, mCanTriggerSwipe(false)
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, mAllowToOverrideSystemScrollSpeed(true)
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{
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}
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virtual WidgetEvent* Duplicate() const override
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{
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MOZ_ASSERT(mClass == eWheelEventClass,
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"Duplicate() must be overridden by sub class");
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// Not copying widget, it is a weak reference.
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WidgetWheelEvent* result = new WidgetWheelEvent(false, mMessage, nullptr);
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result->AssignWheelEventData(*this, true);
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result->mFlags = mFlags;
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return result;
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}
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// On OS X, scroll gestures that start at the edge of the scrollable range
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// can result in a swipe gesture. For the first wheel event of such a
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// gesture, call TriggersSwipe() after the event has been processed
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// in order to find out whether a swipe should be started.
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bool TriggersSwipe() const
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{
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return mCanTriggerSwipe && mViewPortIsOverscrolled &&
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this->mOverflowDeltaX != 0.0;
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}
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// NOTE: mDeltaX, mDeltaY and mDeltaZ may be customized by
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// mousewheel.*.delta_multiplier_* prefs which are applied by
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// EventStateManager. So, after widget dispatches this event,
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// these delta values may have different values than before.
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double mDeltaX;
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double mDeltaY;
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double mDeltaZ;
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// overflowed delta values for scroll, these values are set by
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// nsEventStateManger. If the default action of the wheel event isn't scroll,
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// these values always zero. Otherwise, remaning delta values which are
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// not used by scroll are set.
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// NOTE: mDeltaX, mDeltaY and mDeltaZ may be modified by EventStateManager.
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// However, mOverflowDeltaX and mOverflowDeltaY indicate unused original
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// delta values which are not applied the delta_multiplier prefs.
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// So, if widget wanted to know the actual direction to be scrolled,
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// it would need to check the mDeltaX and mDeltaY.
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double mOverflowDeltaX;
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double mOverflowDeltaY;
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// Should be one of nsIDOMWheelEvent::DOM_DELTA_*
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uint32_t mDeltaMode;
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// If widget sets mLineOrPageDelta, EventStateManager will dispatch
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// eLegacyMouseLineOrPageScroll event for compatibility. Note that the delta
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// value means pages if the mDeltaMode is DOM_DELTA_PAGE, otherwise, lines.
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int32_t mLineOrPageDeltaX;
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int32_t mLineOrPageDeltaY;
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// When the default action for an wheel event is moving history or zooming,
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// need to chose a delta value for doing it.
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int32_t GetPreferredIntDelta()
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{
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if (!mLineOrPageDeltaX && !mLineOrPageDeltaY) {
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return 0;
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}
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if (mLineOrPageDeltaY && !mLineOrPageDeltaX) {
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return mLineOrPageDeltaY;
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}
|
|
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()
|
|
: width(0)
|
|
, height(0)
|
|
, isPrimary(true)
|
|
{
|
|
}
|
|
|
|
public:
|
|
virtual WidgetPointerEvent* AsPointerEvent() override { return this; }
|
|
|
|
WidgetPointerEvent(bool aIsTrusted, EventMessage aMsg, nsIWidget* w)
|
|
: WidgetMouseEvent(aIsTrusted, aMsg, w, ePointerEventClass, eReal)
|
|
, width(0)
|
|
, height(0)
|
|
, isPrimary(true)
|
|
{
|
|
}
|
|
|
|
explicit WidgetPointerEvent(const WidgetMouseEvent& aEvent)
|
|
: WidgetMouseEvent(aEvent)
|
|
, width(0)
|
|
, height(0)
|
|
, isPrimary(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 width;
|
|
uint32_t height;
|
|
bool isPrimary;
|
|
|
|
// XXX Not tested by test_assign_event_data.html
|
|
void AssignPointerEventData(const WidgetPointerEvent& aEvent,
|
|
bool aCopyTargets)
|
|
{
|
|
AssignMouseEventData(aEvent, aCopyTargets);
|
|
|
|
width = aEvent.width;
|
|
height = aEvent.height;
|
|
isPrimary = aEvent.isPrimary;
|
|
}
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_MouseEvents_h__
|