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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include <limits>
#include "ui/events/event_constants.h"
#include "ui/events/events_base_export.h"
#include "ui/gfx/geometry/vector2d.h"
namespace ui {
// Pointer ID type.
using PointerId = int32_t;
// Pointer id which means it needs to be initialized for all pointer types.
static constexpr PointerId kPointerIdUnknown = -1;
// Pointer id to be used by Mouse events.
static constexpr PointerId kPointerIdMouse =
// Structure for handling common fields between touch and mouse to support
// PointerEvents API.
struct EVENTS_BASE_EXPORT PointerDetails {
explicit PointerDetails(EventPointerType pointer_type,
PointerId pointer_id = kPointerIdUnknown);
PointerDetails(EventPointerType pointer_type,
PointerId pointer_id,
float radius_x,
float radius_y,
float force,
float twist = 0.0f,
float tilt_x = 0.0f,
float tilt_y = 0.0f,
float tangential_pressure = 0.0f);
PointerDetails(const PointerDetails& other);
bool operator==(const PointerDetails& other) const;
// The type of pointer device.
EventPointerType pointer_type = EventPointerType::kUnknown;
// Radius of the X (major) axis of the touch ellipse. 0.0 if unknown.
float radius_x = 0.0;
// Radius of the Y (minor) axis of the touch ellipse. 0.0 if unknown.
float radius_y = 0.0;
// Force (pressure) of the touch. Normalized to be [0, 1] except NaN means
// pressure is not supported by the input device.
float force = 0.0;
// Tilt of a pen/stylus from surface normal as plane angle in degrees, values
// lie in [-90,90]. A positive tilt_x is to the right and a positive tilt_y
// is towards the user. 0.0 if unknown.
float tilt_x = 0.0;
float tilt_y = 0.0;
// The normalized tangential pressure (or barrel pressure), typically set by
// an additional control of the stylus, which has a range of [-1,1], where 0
// is the neutral position of the control. Always 0 if the device does not
// support it.
float tangential_pressure = 0.0;
// The clockwise rotation of a pen stylus around its own major axis, in
// degrees in the range [0,359]. Always 0 if the device does not support it.
float twist = 0;
// An identifier that uniquely identifies a pointer during its lifetime.
PointerId id = 0;
// Only used by mouse wheel events. The amount to scroll. This is in multiples
// of kWheelDelta.
// Note: offset_.x() > 0/offset_.y() > 0 means scroll left/up.
gfx::Vector2d offset;
// If you add fields please update ui/events/mojom/event.mojom.
} // namespace ui