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// Copyright 2014 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.
// MSVC++ requires this to be set before any other includes to get M_PI.
#define _USE_MATH_DEFINES
#include "content/browser/renderer_host/input/motion_event_web.h"
#include <cmath>
#include "base/logging.h"
#include "content/browser/renderer_host/input/web_input_event_util.h"
#include "content/common/input/web_touch_event_traits.h"
using blink::WebInputEvent;
using blink::WebPointerProperties;
using blink::WebTouchEvent;
using blink::WebTouchPoint;
namespace content {
namespace {
ui::MotionEvent::Action GetActionFrom(const WebTouchEvent& event) {
DCHECK(event.touchesLength);
switch (event.type) {
case WebInputEvent::TouchStart:
if (WebTouchEventTraits::AllTouchPointsHaveState(
event, WebTouchPoint::StatePressed))
return ui::MotionEvent::ACTION_DOWN;
else
return ui::MotionEvent::ACTION_POINTER_DOWN;
case WebInputEvent::TouchEnd:
if (WebTouchEventTraits::AllTouchPointsHaveState(
event, WebTouchPoint::StateReleased))
return ui::MotionEvent::ACTION_UP;
else
return ui::MotionEvent::ACTION_POINTER_UP;
case WebInputEvent::TouchCancel:
DCHECK(WebTouchEventTraits::AllTouchPointsHaveState(
event, WebTouchPoint::StateCancelled));
return ui::MotionEvent::ACTION_CANCEL;
case WebInputEvent::TouchMove:
return ui::MotionEvent::ACTION_MOVE;
default:
break;
};
NOTREACHED()
<< "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.touchesLength; ++i) {
if (event.touches[i].state != WebTouchPoint::StateUndefined &&
event.touches[i].state != WebTouchPoint::StateStationary)
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.uniqueTouchEventId) {
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_.touchesLength));
return cached_action_index_;
}
size_t MotionEventWeb::GetPointerCount() const { return event_.touchesLength; }
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].position.x;
}
float MotionEventWeb::GetY(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].position.y;
}
float MotionEventWeb::GetRawX(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].screenPosition.x;
}
float MotionEventWeb::GetRawY(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return event_.touches[pointer_index].screenPosition.y;
}
float MotionEventWeb::GetTouchMajor(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return 2.f * std::max(event_.touches[pointer_index].radiusX,
event_.touches[pointer_index].radiusY);
}
float MotionEventWeb::GetTouchMinor(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return 2.f * std::min(event_.touches[pointer_index].radiusX,
event_.touches[pointer_index].radiusY);
}
float MotionEventWeb::GetOrientation(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
float orientation_rad = event_.touches[pointer_index].rotationAngle
* M_PI / 180.f;
DCHECK(0 <= orientation_rad && orientation_rad <= M_PI_2)
<< "Unexpected touch rotation angle";
if (GetToolType(pointer_index) == TOOL_TYPE_STYLUS) {
const WebPointerProperties& pointer = event_.touches[pointer_index];
if (pointer.tiltY <= 0 && pointer.tiltX < 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 += static_cast<float>(M_PI_2);
} else if (pointer.tiltY < 0 && pointer.tiltX >= 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 -= static_cast<float>(M_PI);
} else if (pointer.tiltY >= 0 && pointer.tiltX > 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 -= static_cast<float>(M_PI_2);
}
} else if (event_.touches[pointer_index].radiusX
> event_.touches[pointer_index].radiusY) {
// 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 -= static_cast<float>(M_PI_2);
}
return orientation_rad;
}
float MotionEventWeb::GetPressure(size_t pointer_index) const {
return 0.f;
}
float MotionEventWeb::GetTilt(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
if (GetToolType(pointer_index) != TOOL_TYPE_STYLUS)
return 0.f;
const WebPointerProperties& pointer = event_.touches[pointer_index];
float tilt_x_r = sin(pointer.tiltX * M_PI / 180.f);
float tilt_x_z = cos(pointer.tiltX * M_PI / 180.f);
float tilt_y_r = sin(pointer.tiltY * M_PI / 180.f);
float tilt_y_z = cos(pointer.tiltY * M_PI / 180.f);
float r_x = tilt_x_r * tilt_y_z;
float r_y = tilt_y_r * tilt_x_z;
float r = sqrt(r_x * r_x + r_y * r_y);
float z = tilt_x_z * tilt_y_z;
return atan2(r, z);
}
base::TimeTicks MotionEventWeb::GetEventTime() const {
return base::TimeTicks() +
base::TimeDelta::FromMicroseconds(event_.timeStampSeconds *
base::Time::kMicrosecondsPerSecond);
}
ui::MotionEvent::ToolType MotionEventWeb::GetToolType(
size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
const WebPointerProperties& pointer = event_.touches[pointer_index];
switch (pointer.pointerType) {
case WebPointerProperties::PointerType::Unknown:
return TOOL_TYPE_UNKNOWN;
case WebPointerProperties::PointerType::Mouse:
return TOOL_TYPE_MOUSE;
case WebPointerProperties::PointerType::Pen:
return TOOL_TYPE_STYLUS;
case WebPointerProperties::PointerType::Touch:
return TOOL_TYPE_FINGER;
}
NOTREACHED() << "Unexpected pointerType";
return TOOL_TYPE_UNKNOWN;
}
int MotionEventWeb::GetButtonState() const {
return 0;
}
int MotionEventWeb::GetFlags() const {
return WebEventModifiersToEventFlags(event_.modifiers);
}
} // namespace content
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