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content / browser / renderer_host / input / motion_event_web.cc [blame]
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/input/motion_event_web.h"
#include <numbers>
#include "base/check_op.h"
#include "base/notreached.h"
#include "base/numerics/angle_conversions.h"
#include "components/input/web_touch_event_traits.h"
#include "ui/events/blink/blink_event_util.h"
using blink::WebInputEvent;
using blink::WebPointerProperties;
using blink::WebTouchEvent;
using blink::WebTouchPoint;
using input::WebTouchEventTraits;
namespace content {
namespace {
ui::MotionEvent::Action GetActionFrom(const WebTouchEvent& event) {
DCHECK(event.touches_length);
switch (event.GetType()) {
case WebInputEvent::Type::kTouchStart:
if (WebTouchEventTraits::AllTouchPointsHaveState(
event, WebTouchPoint::State::kStatePressed))
return ui::MotionEvent::Action::DOWN;
else
return ui::MotionEvent::Action::POINTER_DOWN;
case WebInputEvent::Type::kTouchEnd:
if (WebTouchEventTraits::AllTouchPointsHaveState(
event, WebTouchPoint::State::kStateReleased))
return ui::MotionEvent::Action::UP;
else
return ui::MotionEvent::Action::POINTER_UP;
case WebInputEvent::Type::kTouchCancel:
DCHECK(WebTouchEventTraits::AllTouchPointsHaveState(
event, WebTouchPoint::State::kStateCancelled));
return ui::MotionEvent::Action::CANCEL;
case WebInputEvent::Type::kTouchMove:
return ui::MotionEvent::Action::MOVE;
default:
break;
};
NOTREACHED_IN_MIGRATION()
<< "Unable to derive a valid MotionEvent::Action from the WebTouchEvent.";
return ui::MotionEvent::Action::CANCEL;
}
int GetActionIndexFrom(const WebTouchEvent& event) {
for (size_t i = 0; i < event.touches_length; ++i) {
if (event.touches[i].state != WebTouchPoint::State::kStateUndefined &&
event.touches[i].state != WebTouchPoint::State::kStateStationary)
return i;
}
return -1;
}
} // namespace
MotionEventWeb::MotionEventWeb(const WebTouchEvent& event)
: event_(event),
cached_action_(GetActionFrom(event)),
cached_action_index_(GetActionIndexFrom(event)),
unique_event_id_(event.unique_touch_event_id) {
DCHECK_GT(GetPointerCount(), 0U);
}
MotionEventWeb::~MotionEventWeb() {}
uint32_t MotionEventWeb::GetUniqueEventId() const {
return unique_event_id_;
}
MotionEventWeb::Action MotionEventWeb::GetAction() const {
return cached_action_;
}
int MotionEventWeb::GetActionIndex() const {
DCHECK(cached_action_ == Action::POINTER_UP ||
cached_action_ == Action::POINTER_DOWN)
<< "Invalid action for GetActionIndex(): " << cached_action_;
DCHECK_GE(cached_action_index_, 0);
DCHECK_LT(cached_action_index_, static_cast<int>(event_.touches_length));
return cached_action_index_;
}
size_t MotionEventWeb::GetPointerCount() const {
return event_.touches_length;
}
int MotionEventWeb::GetPointerId(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].id;
}
float MotionEventWeb::GetX(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].PositionInWidget().x();
}
float MotionEventWeb::GetY(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].PositionInWidget().y();
}
float MotionEventWeb::GetRawX(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].PositionInScreen().x();
}
float MotionEventWeb::GetRawY(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].PositionInScreen().y();
}
float MotionEventWeb::GetTouchMajor(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return 2.f * std::max(event_.touches[pointer_index].radius_x,
event_.touches[pointer_index].radius_y);
}
float MotionEventWeb::GetTouchMinor(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return 2.f * std::min(event_.touches[pointer_index].radius_x,
event_.touches[pointer_index].radius_y);
}
float MotionEventWeb::GetOrientation(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
float orientation_rad =
base::DegToRad(event_.touches[pointer_index].rotation_angle);
DCHECK(0 <= orientation_rad &&
orientation_rad <= std::numbers::pi_v<float> / 2)
<< "Unexpected touch rotation angle";
if (GetToolType(pointer_index) == ToolType::STYLUS) {
const WebPointerProperties& pointer = event_.touches[pointer_index];
if (pointer.tilt_y <= 0 && pointer.tilt_x < 0) {
// Stylus is tilted to the left away from the user or straight
// to the left thus the orientation should be within [pi/2,pi).
orientation_rad += std::numbers::pi_v<float> / 2;
} else if (pointer.tilt_y < 0 && pointer.tilt_x >= 0) {
// Stylus is tilted to the right away from the user or straight away
// from the user thus the orientation should be within [-pi,-pi/2).
orientation_rad -= std::numbers::pi_v<float>;
} else if (pointer.tilt_y >= 0 && pointer.tilt_x > 0) {
// Stylus is tilted to the right towards the user or straight
// to the right thus the orientation should be within [-pi/2,0).
orientation_rad -= std::numbers::pi_v<float> / 2;
}
} else if (event_.touches[pointer_index].radius_x >
event_.touches[pointer_index].radius_y) {
// The case radiusX == radiusY is omitted from here on purpose: for circles,
// we want to pass the angle (which could be any value in such cases but
// always seems to be set to zero) unchanged.
orientation_rad -= std::numbers::pi_v<float> / 2;
}
return orientation_rad;
}
float MotionEventWeb::GetPressure(size_t pointer_index) const {
return 0.f;
}
float MotionEventWeb::GetTiltX(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].tilt_x;
}
float MotionEventWeb::GetTiltY(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].tilt_y;
}
float MotionEventWeb::GetTwist(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].twist;
}
float MotionEventWeb::GetTangentialPressure(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].tangential_pressure;
}
base::TimeTicks MotionEventWeb::GetEventTime() const {
return event_.TimeStamp();
}
ui::MotionEvent::ToolType MotionEventWeb::GetToolType(
size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
const WebPointerProperties& pointer = event_.touches[pointer_index];
switch (pointer.pointer_type) {
case WebPointerProperties::PointerType::kUnknown:
return ToolType::UNKNOWN;
case WebPointerProperties::PointerType::kMouse:
return ToolType::MOUSE;
case WebPointerProperties::PointerType::kPen:
return ToolType::STYLUS;
case WebPointerProperties::PointerType::kEraser:
return ToolType::ERASER;
case WebPointerProperties::PointerType::kTouch:
return ToolType::FINGER;
}
NOTREACHED_IN_MIGRATION() << "Unexpected pointerType";
return ToolType::UNKNOWN;
}
int MotionEventWeb::GetButtonState() const {
return 0;
}
int MotionEventWeb::GetFlags() const {
return ui::WebEventModifiersToEventFlags(event_.GetModifiers());
}
} // namespace content