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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 "ui/events/gestures/motion_event_aura.h"
#include <cmath>
#include "base/logging.h"
#include "ui/events/gesture_detection/gesture_configuration.h"
namespace ui {
namespace {
PointerProperties GetPointerPropertiesFromTouchEvent(const TouchEvent& touch) {
PointerProperties pointer_properties;
pointer_properties.x = touch.x();
pointer_properties.y = touch.y();
pointer_properties.raw_x = touch.root_location_f().x();
pointer_properties.raw_y = touch.root_location_f().y();
pointer_properties.id = touch.touch_id();
pointer_properties.pressure = touch.force();
pointer_properties.source_device_id = touch.source_device_id();
float radius_x = touch.radius_x();
float radius_y = touch.radius_y();
float rotation_angle_rad = touch.rotation_angle() * M_PI / 180.f;
DCHECK_GE(radius_x, 0) << "Unexpected x-radius < 0";
DCHECK_GE(radius_y, 0) << "Unexpected y-radius < 0";
DCHECK(0 <= rotation_angle_rad && rotation_angle_rad < M_PI)
<< "Unexpected touch rotation angle";
// Make the angle acute to ease subsequent logic. The angle range effectively
// changes from [0, pi) to [0, pi/2).
if (rotation_angle_rad >= M_PI_2) {
rotation_angle_rad -= static_cast<float>(M_PI_2);
std::swap(radius_x, radius_y);
}
if (radius_x > radius_y) {
// The case radius_x == radius_y is omitted from here on purpose: for
// circles, we want to pass the angle (which could be any value in such
// cases but always seem to be set to zero) unchanged.
pointer_properties.touch_major = 2.f * radius_x;
pointer_properties.touch_minor = 2.f * radius_y;
pointer_properties.orientation = rotation_angle_rad - M_PI_2;
} else {
pointer_properties.touch_major = 2.f * radius_y;
pointer_properties.touch_minor = 2.f * radius_x;
pointer_properties.orientation = rotation_angle_rad;
}
if (!pointer_properties.touch_major) {
pointer_properties.touch_major =
2.f * GestureConfiguration::GetInstance()->default_radius();
pointer_properties.touch_minor =
2.f * GestureConfiguration::GetInstance()->default_radius();
pointer_properties.orientation = 0;
}
// TODO(jdduke): Plumb tool type from the platform, crbug.com/404128.
pointer_properties.tool_type = MotionEvent::TOOL_TYPE_UNKNOWN;
return pointer_properties;
}
} // namespace
MotionEventAura::MotionEventAura() {
set_action_index(-1);
}
MotionEventAura::~MotionEventAura() {
}
bool MotionEventAura::OnTouch(const TouchEvent& touch) {
int index = FindPointerIndexOfId(touch.touch_id());
bool pointer_id_is_active = index != -1;
if (touch.type() == ET_TOUCH_PRESSED && pointer_id_is_active) {
// TODO(tdresser): This should return false (or NOTREACHED()), and
// ignore the touch; however, there is at least one case where we
// need to allow a touch press from a currently used touch id. See
// crbug.com/446852 for details.
// Cancel the existing touch, before handling the touch press.
TouchEvent cancel(ET_TOUCH_CANCELLED, touch.location(), touch.touch_id(),
touch.time_stamp());
OnTouch(cancel);
CleanupRemovedTouchPoints(cancel);
DCHECK_EQ(-1, FindPointerIndexOfId(touch.touch_id()));
} else if (touch.type() != ET_TOUCH_PRESSED && !pointer_id_is_active) {
// We could have an active touch stream transfered to us, resulting in touch
// move or touch up events without associated touch down events. Ignore
// them.
return false;
}
if (touch.type() == ET_TOUCH_MOVED && touch.x() == GetX(index) &&
touch.y() == GetY(index)) {
return false;
}
switch (touch.type()) {
case ET_TOUCH_PRESSED:
AddTouch(touch);
break;
case ET_TOUCH_RELEASED:
case ET_TOUCH_CANCELLED:
// Removing these touch points needs to be postponed until after the
// MotionEvent has been dispatched. This cleanup occurs in
// CleanupRemovedTouchPoints.
UpdateTouch(touch);
break;
case ET_TOUCH_MOVED:
UpdateTouch(touch);
break;
default:
NOTREACHED();
return false;
}
UpdateCachedAction(touch);
set_unique_event_id(touch.unique_event_id());
set_flags(touch.flags());
set_event_time(touch.time_stamp() + base::TimeTicks());
return true;
}
void MotionEventAura::CleanupRemovedTouchPoints(const TouchEvent& event) {
if (event.type() != ET_TOUCH_RELEASED &&
event.type() != ET_TOUCH_CANCELLED) {
return;
}
DCHECK(GetPointerCount());
int index_to_delete = GetIndexFromId(event.touch_id());
set_action_index(0);
pointer(index_to_delete) = pointer(GetPointerCount() - 1);
PopPointer();
}
int MotionEventAura::GetSourceDeviceId(size_t pointer_index) const {
DCHECK_LT(pointer_index, GetPointerCount());
return pointer(pointer_index).source_device_id;
}
void MotionEventAura::AddTouch(const TouchEvent& touch) {
if (GetPointerCount() == MotionEvent::MAX_TOUCH_POINT_COUNT)
return;
PushPointer(GetPointerPropertiesFromTouchEvent(touch));
}
void MotionEventAura::UpdateTouch(const TouchEvent& touch) {
pointer(GetIndexFromId(touch.touch_id())) =
GetPointerPropertiesFromTouchEvent(touch);
}
void MotionEventAura::UpdateCachedAction(const TouchEvent& touch) {
DCHECK(GetPointerCount());
switch (touch.type()) {
case ET_TOUCH_PRESSED:
if (GetPointerCount() == 1) {
set_action(ACTION_DOWN);
} else {
set_action(ACTION_POINTER_DOWN);
set_action_index(GetIndexFromId(touch.touch_id()));
}
break;
case ET_TOUCH_RELEASED:
if (GetPointerCount() == 1) {
set_action(ACTION_UP);
} else {
set_action(ACTION_POINTER_UP);
set_action_index(GetIndexFromId(touch.touch_id()));
}
break;
case ET_TOUCH_CANCELLED:
set_action(ACTION_CANCEL);
break;
case ET_TOUCH_MOVED:
set_action(ACTION_MOVE);
break;
default:
NOTREACHED();
break;
}
}
int MotionEventAura::GetIndexFromId(int id) const {
int index = FindPointerIndexOfId(id);
DCHECK_GE(index, 0);
DCHECK_LT(index, static_cast<int>(GetPointerCount()));
return index;
}
} // namespace ui
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