widget/InputData.h
author Doug Turner <doug.turner@gmail.com>
Tue, 03 Feb 2015 17:00:00 +0100
changeset 243715 840987c23fc597bdaad4567c2387ba1aa06c65d0
parent 240500 50952288e4a4b16dfcbe62970409db20861510c9
child 249048 22f8aee2e0e050bb14d80c9fd2e5ba96c2702d05
permissions -rw-r--r--
Bug 1045229 - Beacons are not associated with windows. The current window based filtering that the network monitor does will skip requests that come from sendBeacon(). Here we explictly look to see if the network channel is from beacon by looking at the loadinfo. r=dcamp, a=sledru

/* -*- 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 InputData_h__
#define InputData_h__

#include "nsDebug.h"
#include "nsPoint.h"
#include "nsTArray.h"
#include "Units.h"
#include "mozilla/EventForwards.h"
#include "mozilla/TimeStamp.h"

template<class E> struct already_AddRefed;
class nsIWidget;

namespace mozilla {

namespace dom {
class Touch;
}

enum InputType
{
  MULTITOUCH_INPUT,
  PANGESTURE_INPUT,
  PINCHGESTURE_INPUT,
  TAPGESTURE_INPUT,
  SCROLLWHEEL_INPUT
};

class MultiTouchInput;
class PanGestureInput;
class PinchGestureInput;
class TapGestureInput;
class ScrollWheelInput;

// This looks unnecessary now, but as we add more and more classes that derive
// from InputType (eventually probably almost as many as *Events.h has), it
// will be more and more clear what's going on with a macro that shortens the
// definition of the RTTI functions.
#define INPUTDATA_AS_CHILD_TYPE(type, enumID) \
  const type& As##type() const \
  { \
    NS_ABORT_IF_FALSE(mInputType == enumID, "Invalid cast of InputData."); \
    return (const type&) *this; \
  } \
  type& As##type() \
  { \
    NS_ABORT_IF_FALSE(mInputType == enumID, "Invalid cast of InputData."); \
    return (type&) *this; \
  }

/** Base input data class. Should never be instantiated. */
class InputData
{
public:
  InputType mInputType;
  // Time in milliseconds that this data is relevant to. This only really
  // matters when this data is used as an event. We use uint32_t instead of
  // TimeStamp because it is easier to convert from WidgetInputEvent. The time
  // is platform-specific but it in the case of B2G and Fennec it is since
  // startup.
  uint32_t mTime;
  // Set in parallel to mTime until we determine it is safe to drop
  // platform-specific event times (see bug 77992).
  TimeStamp mTimeStamp;

  Modifiers modifiers;

  INPUTDATA_AS_CHILD_TYPE(MultiTouchInput, MULTITOUCH_INPUT)
  INPUTDATA_AS_CHILD_TYPE(PanGestureInput, PANGESTURE_INPUT)
  INPUTDATA_AS_CHILD_TYPE(PinchGestureInput, PINCHGESTURE_INPUT)
  INPUTDATA_AS_CHILD_TYPE(TapGestureInput, TAPGESTURE_INPUT)
  INPUTDATA_AS_CHILD_TYPE(ScrollWheelInput, SCROLLWHEEL_INPUT)

  InputData()
  {
  }

protected:
  InputData(InputType aInputType, uint32_t aTime, TimeStamp aTimeStamp,
            Modifiers aModifiers)
    : mInputType(aInputType),
      mTime(aTime),
      mTimeStamp(aTimeStamp),
      modifiers(aModifiers)
  {


  }
};

/**
 * Data container for a single touch input. Similar to dom::Touch, but used in
 * off-main-thread situations. This is more for just storing touch data, whereas
 * dom::Touch is more useful for dispatching through the DOM (which can only
 * happen on the main thread). dom::Touch also bears the problem of storing
 * pointers to nsIWidget instances which can only be used on the main thread,
 * so if instead we used dom::Touch and ever set these pointers
 * off-main-thread, Bad Things Can Happen(tm).
 *
 * Note that this doesn't inherit from InputData because this itself is not an
 * event. It is only a container/struct that should have any number of instances
 * within a MultiTouchInput.
 *
 * fixme/bug 775746: Make dom::Touch inherit from this class.
 */
class SingleTouchData
{
public:
  // Construct a SingleTouchData from a Screen point.
  // mLocalScreenPoint remains (0,0) unless it's set later.
  SingleTouchData(int32_t aIdentifier,
                  ScreenIntPoint aScreenPoint,
                  ScreenSize aRadius,
                  float aRotationAngle,
                  float aForce)
    : mIdentifier(aIdentifier),
      mScreenPoint(aScreenPoint),
      mRadius(aRadius),
      mRotationAngle(aRotationAngle),
      mForce(aForce)
  {
  }

  // Construct a SingleTouchData from a ParentLayer point.
  // mScreenPoint remains (0,0) unless it's set later.
  // Note: if APZ starts using the radius for anything, we should add a local
  // version of that too, and have this constructor take it as a ParentLayerSize.
  SingleTouchData(int32_t aIdentifier,
                  ParentLayerPoint aLocalScreenPoint,
                  ScreenSize aRadius,
                  float aRotationAngle,
                  float aForce)
    : mIdentifier(aIdentifier),
      mLocalScreenPoint(aLocalScreenPoint),
      mRadius(aRadius),
      mRotationAngle(aRotationAngle),
      mForce(aForce)
  {
  }

  SingleTouchData()
  {
  }

  already_AddRefed<dom::Touch> ToNewDOMTouch() const;

  // A unique number assigned to each SingleTouchData within a MultiTouchInput so
  // that they can be easily distinguished when handling a touch start/move/end.
  int32_t mIdentifier;

  // Point on the screen that the touch hit, in device pixels. They are
  // coordinates on the screen.
  ScreenIntPoint mScreenPoint;

  // |mScreenPoint| transformed to the local coordinates of the APZC targeted
  // by the hit. This is set and used by APZ.
  ParentLayerPoint mLocalScreenPoint;

  // Radius that the touch covers, i.e. if you're using your thumb it will
  // probably be larger than using your pinky, even with the same force.
  // Radius can be different along x and y. For example, if you press down with
  // your entire finger vertically, the y radius will be much larger than the x
  // radius.
  ScreenSize mRadius;

  float mRotationAngle;

  // How hard the screen is being pressed.
  float mForce;
};

/**
 * Similar to WidgetTouchEvent, but for use off-main-thread. Also only stores a
 * screen touch point instead of the many different coordinate spaces
 * WidgetTouchEvent stores its touch point in. This includes a way to initialize
 * itself from a WidgetTouchEvent by copying all relevant data over. Note that
 * this copying from WidgetTouchEvent functionality can only be used on the main
 * thread.
 *
 * Stores an array of SingleTouchData.
 */
class MultiTouchInput : public InputData
{
public:
  enum MultiTouchType
  {
    MULTITOUCH_START,
    MULTITOUCH_MOVE,
    MULTITOUCH_END,
    MULTITOUCH_CANCEL
  };

  MultiTouchInput(MultiTouchType aType, uint32_t aTime, TimeStamp aTimeStamp,
                  Modifiers aModifiers)
    : InputData(MULTITOUCH_INPUT, aTime, aTimeStamp, aModifiers),
      mType(aType)
  {
  }

  MultiTouchInput()
  {
  }

  MultiTouchInput(const MultiTouchInput& aOther)
    : InputData(MULTITOUCH_INPUT, aOther.mTime,
                aOther.mTimeStamp, aOther.modifiers)
    , mType(aOther.mType)
  {
    mTouches.AppendElements(aOther.mTouches);
  }

  explicit MultiTouchInput(const WidgetTouchEvent& aTouchEvent);
  WidgetTouchEvent ToWidgetTouchEvent(nsIWidget* aWidget) const;

  // This conversion from WidgetMouseEvent to MultiTouchInput is needed because
  // on the B2G emulator we can only receive mouse events, but we need to be
  // able to pan correctly. To do this, we convert the events into a format that
  // the panning code can handle. This code is very limited and only supports
  // SingleTouchData. It also sends garbage for the identifier, radius, force
  // and rotation angle.
  explicit MultiTouchInput(const WidgetMouseEvent& aMouseEvent);

  MultiTouchType mType;
  nsTArray<SingleTouchData> mTouches;
};

/**
 * Encapsulation class for pan events, can be used off-main-thread.
 * These events are currently only used for scrolling on desktop.
 */
class PanGestureInput : public InputData
{
public:
  enum PanGestureType
  {
    // MayStart: Dispatched before any actual panning has occurred but when a
    // pan gesture is probably about to start, for example when the user
    // starts touching the touchpad. Should interrupt any ongoing APZ
    // animation and can be used to trigger scrollability indicators (e.g.
    // flashing overlay scrollbars).
    PANGESTURE_MAYSTART,

    // Cancelled: Dispatched after MayStart when no pan gesture is going to
    // happen after all, for example when the user lifts their fingers from a
    // touchpad without having done any scrolling.
    PANGESTURE_CANCELLED,

    // Start: A pan gesture is starting.
    // For devices that do not support the MayStart event type, this event can
    // be used to interrupt ongoing APZ animations.
    PANGESTURE_START,

    // Pan: The actual pan motion by mPanDisplacement.
    PANGESTURE_PAN,

    // End: The pan gesture has ended, for example because the user has lifted
    // their fingers from a touchpad after scrolling.
    // Any potential momentum events fire after this event.
    PANGESTURE_END,

    // The following momentum event types are used in order to control the pan
    // momentum animation. Using these instead of our own animation ensures
    // that the animation curve is OS native and that the animation stops
    // reliably if it is cancelled by the user.

    // MomentumStart: Dispatched between the End event of the actual
    // user-controlled pan, and the first MomentumPan event of the momentum
    // animation.
    PANGESTURE_MOMENTUMSTART,

    // MomentumPan: The actual momentum motion by mPanDisplacement.
    PANGESTURE_MOMENTUMPAN,

    // MomentumEnd: The momentum animation has ended, for example because the
    // momentum velocity has gone below the stopping threshold, or because the
    // user has stopped the animation by putting their fingers on a touchpad.
    PANGESTURE_MOMENTUMEND
  };

  PanGestureInput(PanGestureType aType,
                  uint32_t aTime,
                  TimeStamp aTimeStamp,
                  const ScreenPoint& aPanStartPoint,
                  const ScreenPoint& aPanDisplacement,
                  Modifiers aModifiers)
    : InputData(PANGESTURE_INPUT, aTime, aTimeStamp, aModifiers),
      mType(aType),
      mPanStartPoint(aPanStartPoint),
      mPanDisplacement(aPanDisplacement)
  {
  }

  PanGestureType mType;
  ScreenPoint mPanStartPoint;

  // Only non-zero if mType is PANGESTURE_PAN or PANGESTURE_MOMENTUMPAN.
  ScreenPoint mPanDisplacement;

  // Versions of |mPanStartPoint| and |mPanDisplacement| in the local
  // coordinates of the APZC receiving the pan. These are set and used by APZ.
  ParentLayerPoint mLocalPanStartPoint;
  ParentLayerPoint mLocalPanDisplacement;
};

/**
 * Encapsulation class for pinch events. In general, these will be generated by
 * a gesture listener by looking at SingleTouchData/MultiTouchInput instances and
 * determining whether or not the user was trying to do a gesture.
 */
class PinchGestureInput : public InputData
{
public:
  enum PinchGestureType
  {
    PINCHGESTURE_START,
    PINCHGESTURE_SCALE,
    PINCHGESTURE_END
  };

  // Construct a tap gesture from a Screen point.
  // mLocalFocusPoint remains (0,0) unless it's set later.
  PinchGestureInput(PinchGestureType aType,
                    uint32_t aTime,
                    TimeStamp aTimeStamp,
                    const ScreenPoint& aFocusPoint,
                    float aCurrentSpan,
                    float aPreviousSpan,
                    Modifiers aModifiers)
    : InputData(PINCHGESTURE_INPUT, aTime, aTimeStamp, aModifiers),
      mType(aType),
      mFocusPoint(aFocusPoint),
      mCurrentSpan(aCurrentSpan),
      mPreviousSpan(aPreviousSpan)
  {
  }

  // Construct a tap gesture from a ParentLayer point.
  // mFocusPoint remains (0,0) unless it's set later.
  PinchGestureInput(PinchGestureType aType,
                    uint32_t aTime,
                    TimeStamp aTimeStamp,
                    const ParentLayerPoint& aLocalFocusPoint,
                    float aCurrentSpan,
                    float aPreviousSpan,
                    Modifiers aModifiers)
    : InputData(PINCHGESTURE_INPUT, aTime, aTimeStamp, aModifiers),
      mType(aType),
      mLocalFocusPoint(aLocalFocusPoint),
      mCurrentSpan(aCurrentSpan),
      mPreviousSpan(aPreviousSpan)
  {
  }

  PinchGestureType mType;

  // Center point of the pinch gesture. That is, if there are two fingers on the
  // screen, it is their midpoint. In the case of more than two fingers, the
  // point is implementation-specific, but can for example be the midpoint
  // between the very first and very last touch. This is in device pixels and
  // are the coordinates on the screen of this midpoint.
  ScreenPoint mFocusPoint;

  // |mFocusPoint| transformed to the local coordinates of the APZC targeted
  // by the hit. This is set and used by APZ.
  ParentLayerPoint mLocalFocusPoint;

  // The distance in device pixels (though as a float for increased precision
  // and because it is the distance along both the x and y axis) between the
  // touches responsible for the pinch gesture.
  float mCurrentSpan;

  // The previous |mCurrentSpan| in the PinchGestureInput preceding this one.
  // This is only really relevant during a PINCHGESTURE_SCALE because when it is
  // of this type then there must have been a history of spans.
  float mPreviousSpan;
};

/**
 * Encapsulation class for tap events. In general, these will be generated by
 * a gesture listener by looking at SingleTouchData/MultiTouchInput instances and
 * determining whether or not the user was trying to do a gesture.
 */
class TapGestureInput : public InputData
{
public:
  enum TapGestureType
  {
    TAPGESTURE_LONG,
    TAPGESTURE_LONG_UP,
    TAPGESTURE_UP,
    TAPGESTURE_CONFIRMED,
    TAPGESTURE_DOUBLE,
    TAPGESTURE_CANCEL
  };

  // Construct a tap gesture from a Screen point.
  // mLocalPoint remains (0,0) unless it's set later.
  TapGestureInput(TapGestureType aType,
                  uint32_t aTime,
                  TimeStamp aTimeStamp,
                  const ScreenIntPoint& aPoint,
                  Modifiers aModifiers)
    : InputData(TAPGESTURE_INPUT, aTime, aTimeStamp, aModifiers),
      mType(aType),
      mPoint(aPoint)
  {
  }

  // Construct a tap gesture from a ParentLayer point.
  // mPoint remains (0,0) unless it's set later.
  TapGestureInput(TapGestureType aType,
                  uint32_t aTime,
                  TimeStamp aTimeStamp,
                  const ParentLayerPoint& aLocalPoint,
                  Modifiers aModifiers)
    : InputData(TAPGESTURE_INPUT, aTime, aTimeStamp, aModifiers),
      mType(aType),
      mLocalPoint(aLocalPoint)
  {
  }

  TapGestureType mType;

  // The location of the tap in screen pixels.
  ScreenIntPoint mPoint;

  // The location of the tap in the local coordinates of the APZC receiving it.
  // This is set and used by APZ.
  ParentLayerPoint mLocalPoint;
};

// Encapsulation class for scroll-wheel events. These are generated by mice
// with physical scroll wheels, and on Windows by most touchpads when using
// scroll gestures.
class ScrollWheelInput : public InputData
{
public:
  enum ScrollDeltaType
  {
    // There are three kinds of scroll delta modes in Gecko: "page", "line" and
    // "pixel". For apz, we currently only support "line" mode.
    SCROLLDELTA_LINE
  };

  enum ScrollMode
  {
    SCROLLMODE_INSTANT,
    SCROLLMODE_SMOOTH
  };

  ScrollWheelInput(uint32_t aTime,
                   TimeStamp aTimeStamp,
                   Modifiers aModifiers,
                   ScrollMode aScrollMode,
                   ScrollDeltaType aDeltaType,
                   const ScreenPoint& aOrigin,
                   double aDeltaX,
                   double aDeltaY)
   : InputData(SCROLLWHEEL_INPUT, aTime, aTimeStamp, aModifiers),
     mDeltaType(aDeltaType),
     mScrollMode(aScrollMode),
     mOrigin(aOrigin),
     mDeltaX(aDeltaX),
     mDeltaY(aDeltaY)
  {}

  ScrollDeltaType mDeltaType;
  ScrollMode mScrollMode;
  ScreenPoint mOrigin;

  // Deltas are in units corresponding to the delta type. For line deltas, they
  // are the number of line units to scroll. The number of device pixels for a
  // horizontal and vertical line unit are in FrameMetrics::mLineScrollAmount.
  //
  // The horizontal (X) delta is > 0 for scrolling right and < 0 for scrolling
  // left. The vertical (Y) delta is < 0 for scrolling up and > 0 for
  // scrolling down.
  double mDeltaX;
  double mDeltaY;

  // The location of the scroll in local coordinates. This is set and used by
  // APZ.
  ParentLayerPoint mLocalOrigin;
};

}

#endif // InputData_h__