// Copyright (c) 2012 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 "ui/events/event.h"
#if defined(USE_X11)
#include <X11/extensions/XInput2.h>
#include <X11/Xlib.h>
#endif
#include <cmath>
#include <cstring>
#include "base/metrics/histogram.h"
#include "base/strings/stringprintf.h"
#include "ui/events/event_utils.h"
#include "ui/events/keycodes/keyboard_code_conversion.h"
#include "ui/gfx/point3_f.h"
#include "ui/gfx/point_conversions.h"
#include "ui/gfx/transform.h"
#include "ui/gfx/transform_util.h"
#if defined(USE_X11)
#include "ui/events/keycodes/keyboard_code_conversion_x.h"
#elif defined(USE_OZONE)
#include "ui/events/keycodes/keyboard_code_conversion.h"
#endif
namespace {
std::string EventTypeName(ui::EventType type) {
#define RETURN_IF_TYPE(t) if (type == ui::t) return #t
#define CASE_TYPE(t) case ui::t: return #t
switch (type) {
CASE_TYPE(ET_UNKNOWN);
CASE_TYPE(ET_MOUSE_PRESSED);
CASE_TYPE(ET_MOUSE_DRAGGED);
CASE_TYPE(ET_MOUSE_RELEASED);
CASE_TYPE(ET_MOUSE_MOVED);
CASE_TYPE(ET_MOUSE_ENTERED);
CASE_TYPE(ET_MOUSE_EXITED);
CASE_TYPE(ET_KEY_PRESSED);
CASE_TYPE(ET_KEY_RELEASED);
CASE_TYPE(ET_MOUSEWHEEL);
CASE_TYPE(ET_MOUSE_CAPTURE_CHANGED);
CASE_TYPE(ET_TOUCH_RELEASED);
CASE_TYPE(ET_TOUCH_PRESSED);
CASE_TYPE(ET_TOUCH_MOVED);
CASE_TYPE(ET_TOUCH_CANCELLED);
CASE_TYPE(ET_DROP_TARGET_EVENT);
CASE_TYPE(ET_TRANSLATED_KEY_PRESS);
CASE_TYPE(ET_TRANSLATED_KEY_RELEASE);
CASE_TYPE(ET_GESTURE_SCROLL_BEGIN);
CASE_TYPE(ET_GESTURE_SCROLL_END);
CASE_TYPE(ET_GESTURE_SCROLL_UPDATE);
CASE_TYPE(ET_GESTURE_SHOW_PRESS);
CASE_TYPE(ET_GESTURE_WIN8_EDGE_SWIPE);
CASE_TYPE(ET_GESTURE_TAP);
CASE_TYPE(ET_GESTURE_TAP_DOWN);
CASE_TYPE(ET_GESTURE_TAP_CANCEL);
CASE_TYPE(ET_GESTURE_BEGIN);
CASE_TYPE(ET_GESTURE_END);
CASE_TYPE(ET_GESTURE_TWO_FINGER_TAP);
CASE_TYPE(ET_GESTURE_PINCH_BEGIN);
CASE_TYPE(ET_GESTURE_PINCH_END);
CASE_TYPE(ET_GESTURE_PINCH_UPDATE);
CASE_TYPE(ET_GESTURE_LONG_PRESS);
CASE_TYPE(ET_GESTURE_LONG_TAP);
CASE_TYPE(ET_GESTURE_SWIPE);
CASE_TYPE(ET_GESTURE_TAP_UNCONFIRMED);
CASE_TYPE(ET_GESTURE_DOUBLE_TAP);
CASE_TYPE(ET_SCROLL);
CASE_TYPE(ET_SCROLL_FLING_START);
CASE_TYPE(ET_SCROLL_FLING_CANCEL);
CASE_TYPE(ET_CANCEL_MODE);
CASE_TYPE(ET_UMA_DATA);
case ui::ET_LAST: NOTREACHED(); return std::string();
// Don't include default, so that we get an error when new type is added.
}
#undef CASE_TYPE
NOTREACHED();
return std::string();
}
bool IsX11SendEventTrue(const base::NativeEvent& event) {
#if defined(USE_X11)
return event && event->xany.send_event;
#else
return false;
#endif
}
bool X11EventHasNonStandardState(const base::NativeEvent& event) {
#if defined(USE_X11)
const unsigned int kAllStateMask =
Button1Mask | Button2Mask | Button3Mask | Button4Mask | Button5Mask |
Mod1Mask | Mod2Mask | Mod3Mask | Mod4Mask | Mod5Mask | ShiftMask |
LockMask | ControlMask | AnyModifier;
return event && (event->xkey.state & ~kAllStateMask) != 0;
#else
return false;
#endif
}
} // namespace
namespace ui {
////////////////////////////////////////////////////////////////////////////////
// Event
Event::~Event() {
if (delete_native_event_)
ReleaseCopiedNativeEvent(native_event_);
}
bool Event::HasNativeEvent() const {
base::NativeEvent null_event;
std::memset(&null_event, 0, sizeof(null_event));
return !!std::memcmp(&native_event_, &null_event, sizeof(null_event));
}
void Event::StopPropagation() {
// TODO(sad): Re-enable these checks once View uses dispatcher to dispatch
// events.
// CHECK(phase_ != EP_PREDISPATCH && phase_ != EP_POSTDISPATCH);
CHECK(cancelable_);
result_ = static_cast<EventResult>(result_ | ER_CONSUMED);
}
void Event::SetHandled() {
// TODO(sad): Re-enable these checks once View uses dispatcher to dispatch
// events.
// CHECK(phase_ != EP_PREDISPATCH && phase_ != EP_POSTDISPATCH);
CHECK(cancelable_);
result_ = static_cast<EventResult>(result_ | ER_HANDLED);
}
Event::Event(EventType type, base::TimeDelta time_stamp, int flags)
: type_(type),
time_stamp_(time_stamp),
flags_(flags),
native_event_(base::NativeEvent()),
delete_native_event_(false),
cancelable_(true),
target_(NULL),
phase_(EP_PREDISPATCH),
result_(ER_UNHANDLED) {
if (type_ < ET_LAST)
name_ = EventTypeName(type_);
}
Event::Event(const base::NativeEvent& native_event,
EventType type,
int flags)
: type_(type),
time_stamp_(EventTimeFromNative(native_event)),
flags_(flags),
native_event_(native_event),
delete_native_event_(false),
cancelable_(true),
target_(NULL),
phase_(EP_PREDISPATCH),
result_(ER_UNHANDLED) {
base::TimeDelta delta = EventTimeForNow() - time_stamp_;
if (type_ < ET_LAST)
name_ = EventTypeName(type_);
UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.Browser",
delta.InMicroseconds(), 1, 1000000, 100);
std::string name_for_event =
base::StringPrintf("Event.Latency.Browser.%s", name_.c_str());
base::HistogramBase* counter_for_type =
base::Histogram::FactoryGet(
name_for_event,
1,
1000000,
100,
base::HistogramBase::kUmaTargetedHistogramFlag);
counter_for_type->Add(delta.InMicroseconds());
}
Event::Event(const Event& copy)
: type_(copy.type_),
time_stamp_(copy.time_stamp_),
latency_(copy.latency_),
flags_(copy.flags_),
native_event_(CopyNativeEvent(copy.native_event_)),
delete_native_event_(true),
cancelable_(true),
target_(NULL),
phase_(EP_PREDISPATCH),
result_(ER_UNHANDLED) {
if (type_ < ET_LAST)
name_ = EventTypeName(type_);
}
void Event::SetType(EventType type) {
if (type_ < ET_LAST)
name_ = std::string();
type_ = type;
if (type_ < ET_LAST)
name_ = EventTypeName(type_);
}
////////////////////////////////////////////////////////////////////////////////
// CancelModeEvent
CancelModeEvent::CancelModeEvent()
: Event(ET_CANCEL_MODE, base::TimeDelta(), 0) {
set_cancelable(false);
}
CancelModeEvent::~CancelModeEvent() {
}
////////////////////////////////////////////////////////////////////////////////
// LocatedEvent
LocatedEvent::~LocatedEvent() {
}
LocatedEvent::LocatedEvent(const base::NativeEvent& native_event)
: Event(native_event,
EventTypeFromNative(native_event),
EventFlagsFromNative(native_event)),
location_(EventLocationFromNative(native_event)),
root_location_(location_) {
}
LocatedEvent::LocatedEvent(EventType type,
const gfx::PointF& location,
const gfx::PointF& root_location,
base::TimeDelta time_stamp,
int flags)
: Event(type, time_stamp, flags),
location_(location),
root_location_(root_location) {
}
void LocatedEvent::UpdateForRootTransform(
const gfx::Transform& reversed_root_transform) {
// Transform has to be done at root level.
gfx::Point3F p(location_);
reversed_root_transform.TransformPoint(&p);
location_ = p.AsPointF();
root_location_ = location_;
}
////////////////////////////////////////////////////////////////////////////////
// MouseEvent
MouseEvent::MouseEvent(const base::NativeEvent& native_event)
: LocatedEvent(native_event),
changed_button_flags_(
GetChangedMouseButtonFlagsFromNative(native_event)) {
if (type() == ET_MOUSE_PRESSED || type() == ET_MOUSE_RELEASED)
SetClickCount(GetRepeatCount(*this));
}
MouseEvent::MouseEvent(EventType type,
const gfx::PointF& location,
const gfx::PointF& root_location,
int flags,
int changed_button_flags)
: LocatedEvent(type, location, root_location, EventTimeForNow(), flags),
changed_button_flags_(changed_button_flags) {
if (this->type() == ET_MOUSE_MOVED && IsAnyButton())
SetType(ET_MOUSE_DRAGGED);
}
// static
bool MouseEvent::IsRepeatedClickEvent(
const MouseEvent& event1,
const MouseEvent& event2) {
// These values match the Windows defaults.
static const int kDoubleClickTimeMS = 500;
static const int kDoubleClickWidth = 4;
static const int kDoubleClickHeight = 4;
if (event1.type() != ET_MOUSE_PRESSED ||
event2.type() != ET_MOUSE_PRESSED)
return false;
// Compare flags, but ignore EF_IS_DOUBLE_CLICK to allow triple clicks.
if ((event1.flags() & ~EF_IS_DOUBLE_CLICK) !=
(event2.flags() & ~EF_IS_DOUBLE_CLICK))
return false;
base::TimeDelta time_difference = event2.time_stamp() - event1.time_stamp();
if (time_difference.InMilliseconds() > kDoubleClickTimeMS)
return false;
if (std::abs(event2.x() - event1.x()) > kDoubleClickWidth / 2)
return false;
if (std::abs(event2.y() - event1.y()) > kDoubleClickHeight / 2)
return false;
return true;
}
// static
int MouseEvent::GetRepeatCount(const MouseEvent& event) {
int click_count = 1;
if (last_click_event_) {
if (event.type() == ui::ET_MOUSE_RELEASED) {
if (event.changed_button_flags() ==
last_click_event_->changed_button_flags()) {
last_click_complete_ = true;
return last_click_event_->GetClickCount();
} else {
// If last_click_event_ has changed since this button was pressed
// return a click count of 1.
return click_count;
}
}
if (event.time_stamp() != last_click_event_->time_stamp())
last_click_complete_ = true;
if (!last_click_complete_ ||
IsX11SendEventTrue(event.native_event())) {
click_count = last_click_event_->GetClickCount();
} else if (IsRepeatedClickEvent(*last_click_event_, event)) {
click_count = last_click_event_->GetClickCount() + 1;
}
delete last_click_event_;
}
last_click_event_ = new MouseEvent(event);
last_click_complete_ = false;
if (click_count > 3)
click_count = 3;
last_click_event_->SetClickCount(click_count);
return click_count;
}
void MouseEvent::ResetLastClickForTest() {
if (last_click_event_) {
delete last_click_event_;
last_click_event_ = NULL;
last_click_complete_ = false;
}
}
// static
MouseEvent* MouseEvent::last_click_event_ = NULL;
bool MouseEvent::last_click_complete_ = false;
int MouseEvent::GetClickCount() const {
if (type() != ET_MOUSE_PRESSED && type() != ET_MOUSE_RELEASED)
return 0;
if (flags() & EF_IS_TRIPLE_CLICK)
return 3;
else if (flags() & EF_IS_DOUBLE_CLICK)
return 2;
else
return 1;
}
void MouseEvent::SetClickCount(int click_count) {
if (type() != ET_MOUSE_PRESSED && type() != ET_MOUSE_RELEASED)
return;
DCHECK(click_count > 0);
DCHECK(click_count <= 3);
int f = flags();
switch (click_count) {
case 1:
f &= ~EF_IS_DOUBLE_CLICK;
f &= ~EF_IS_TRIPLE_CLICK;
break;
case 2:
f |= EF_IS_DOUBLE_CLICK;
f &= ~EF_IS_TRIPLE_CLICK;
break;
case 3:
f &= ~EF_IS_DOUBLE_CLICK;
f |= EF_IS_TRIPLE_CLICK;
break;
}
set_flags(f);
}
////////////////////////////////////////////////////////////////////////////////
// MouseWheelEvent
MouseWheelEvent::MouseWheelEvent(const base::NativeEvent& native_event)
: MouseEvent(native_event),
offset_(GetMouseWheelOffset(native_event)) {
}
MouseWheelEvent::MouseWheelEvent(const ScrollEvent& scroll_event)
: MouseEvent(scroll_event),
offset_(scroll_event.x_offset(), scroll_event.y_offset()){
SetType(ET_MOUSEWHEEL);
}
MouseWheelEvent::MouseWheelEvent(const MouseEvent& mouse_event,
int x_offset,
int y_offset)
: MouseEvent(mouse_event), offset_(x_offset, y_offset) {
DCHECK(type() == ET_MOUSEWHEEL);
}
MouseWheelEvent::MouseWheelEvent(const MouseWheelEvent& mouse_wheel_event)
: MouseEvent(mouse_wheel_event),
offset_(mouse_wheel_event.offset()) {
DCHECK(type() == ET_MOUSEWHEEL);
}
#if defined(OS_WIN)
// This value matches windows WHEEL_DELTA.
// static
const int MouseWheelEvent::kWheelDelta = 120;
#else
// This value matches GTK+ wheel scroll amount.
const int MouseWheelEvent::kWheelDelta = 53;
#endif
void MouseWheelEvent::UpdateForRootTransform(
const gfx::Transform& inverted_root_transform) {
LocatedEvent::UpdateForRootTransform(inverted_root_transform);
gfx::DecomposedTransform decomp;
bool success = gfx::DecomposeTransform(&decomp, inverted_root_transform);
DCHECK(success);
if (decomp.scale[0])
offset_.set_x(offset_.x() * decomp.scale[0]);
if (decomp.scale[1])
offset_.set_y(offset_.y() * decomp.scale[1]);
}
////////////////////////////////////////////////////////////////////////////////
// TouchEvent
TouchEvent::TouchEvent(const base::NativeEvent& native_event)
: LocatedEvent(native_event),
touch_id_(GetTouchId(native_event)),
radius_x_(GetTouchRadiusX(native_event)),
radius_y_(GetTouchRadiusY(native_event)),
rotation_angle_(GetTouchAngle(native_event)),
force_(GetTouchForce(native_event)),
source_device_id_(-1) {
latency()->AddLatencyNumberWithTimestamp(
INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT,
0,
0,
base::TimeTicks::FromInternalValue(time_stamp().ToInternalValue()),
1);
#if defined(USE_X11)
XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(native_event->xcookie.data);
source_device_id_ = xiev->deviceid;
#endif
latency()->AddLatencyNumber(INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
}
TouchEvent::TouchEvent(EventType type,
const gfx::PointF& location,
int touch_id,
base::TimeDelta time_stamp)
: LocatedEvent(type, location, location, time_stamp, 0),
touch_id_(touch_id),
radius_x_(0.0f),
radius_y_(0.0f),
rotation_angle_(0.0f),
force_(0.0f),
source_device_id_(-1) {
latency()->AddLatencyNumber(INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
}
TouchEvent::TouchEvent(EventType type,
const gfx::PointF& location,
int flags,
int touch_id,
base::TimeDelta time_stamp,
float radius_x,
float radius_y,
float angle,
float force)
: LocatedEvent(type, location, location, time_stamp, flags),
touch_id_(touch_id),
radius_x_(radius_x),
radius_y_(radius_y),
rotation_angle_(angle),
force_(force),
source_device_id_(-1) {
latency()->AddLatencyNumber(INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
}
TouchEvent::~TouchEvent() {
// In ctor TouchEvent(native_event) we call GetTouchId() which in X11
// platform setups the tracking_id to slot mapping. So in dtor here,
// if this touch event is a release event, we clear the mapping accordingly.
if (HasNativeEvent())
ClearTouchIdIfReleased(native_event());
}
void TouchEvent::UpdateForRootTransform(
const gfx::Transform& inverted_root_transform) {
LocatedEvent::UpdateForRootTransform(inverted_root_transform);
gfx::DecomposedTransform decomp;
bool success = gfx::DecomposeTransform(&decomp, inverted_root_transform);
DCHECK(success);
if (decomp.scale[0])
radius_x_ *= decomp.scale[0];
if (decomp.scale[1])
radius_y_ *= decomp.scale[1];
}
////////////////////////////////////////////////////////////////////////////////
// KeyEvent
// static
KeyEvent* KeyEvent::last_key_event_ = NULL;
// static
bool KeyEvent::IsRepeated(const KeyEvent& event) {
// A safe guard in case if there were continous key pressed events that are
// not auto repeat.
const int kMaxAutoRepeatTimeMs = 2000;
// Ignore key events that have non standard state masks as it may be
// reposted by an IME. IBUS-GTK uses this field to detect the
// re-posted event for example. crbug.com/385873.
if (X11EventHasNonStandardState(event.native_event()))
return false;
if (event.is_char())
return false;
if (event.type() == ui::ET_KEY_RELEASED) {
delete last_key_event_;
last_key_event_ = NULL;
return false;
}
CHECK_EQ(ui::ET_KEY_PRESSED, event.type());
if (!last_key_event_) {
last_key_event_ = new KeyEvent(event);
return false;
}
if (event.key_code() == last_key_event_->key_code() &&
event.flags() == last_key_event_->flags() &&
(event.time_stamp() - last_key_event_->time_stamp()).InMilliseconds() <
kMaxAutoRepeatTimeMs) {
return true;
}
delete last_key_event_;
last_key_event_ = new KeyEvent(event);
return false;
}
KeyEvent::KeyEvent(const base::NativeEvent& native_event, bool is_char)
: Event(native_event,
EventTypeFromNative(native_event),
EventFlagsFromNative(native_event)),
key_code_(KeyboardCodeFromNative(native_event)),
code_(CodeFromNative(native_event)),
is_char_(is_char),
platform_keycode_(PlatformKeycodeFromNative(native_event)),
character_(0) {
if (IsRepeated(*this))
set_flags(flags() | ui::EF_IS_REPEAT);
#if defined(USE_X11)
NormalizeFlags();
#endif
}
KeyEvent::KeyEvent(EventType type,
KeyboardCode key_code,
int flags,
bool is_char)
: Event(type, EventTimeForNow(), flags),
key_code_(key_code),
is_char_(is_char),
platform_keycode_(0),
character_(GetCharacterFromKeyCode(key_code, flags)) {
}
KeyEvent::KeyEvent(EventType type,
KeyboardCode key_code,
const std::string& code,
int flags,
bool is_char)
: Event(type, EventTimeForNow(), flags),
key_code_(key_code),
code_(code),
is_char_(is_char),
platform_keycode_(0),
character_(GetCharacterFromKeyCode(key_code, flags)) {
}
uint16 KeyEvent::GetCharacter() const {
if (character_)
return character_;
#if defined(OS_WIN)
return (native_event().message == WM_CHAR) ? key_code_ :
GetCharacterFromKeyCode(key_code_, flags());
#elif defined(USE_X11)
if (!native_event())
return GetCharacterFromKeyCode(key_code_, flags());
DCHECK(native_event()->type == KeyPress ||
native_event()->type == KeyRelease);
// When a control key is held, prefer ASCII characters to non ASCII
// characters in order to use it for shortcut keys. GetCharacterFromKeyCode
// returns 'a' for VKEY_A even if the key is actually bound to 'à' in X11.
// GetCharacterFromXEvent returns 'à' in that case.
return IsControlDown() ?
GetCharacterFromKeyCode(key_code_, flags()) :
GetCharacterFromXEvent(native_event());
#else
if (native_event()) {
DCHECK(EventTypeFromNative(native_event()) == ET_KEY_PRESSED ||
EventTypeFromNative(native_event()) == ET_KEY_RELEASED);
}
return GetCharacterFromKeyCode(key_code_, flags());
#endif
}
bool KeyEvent::IsUnicodeKeyCode() const {
#if defined(OS_WIN)
if (!IsAltDown())
return false;
const int key = key_code();
if (key >= VKEY_NUMPAD0 && key <= VKEY_NUMPAD9)
return true;
// Check whether the user is using the numeric keypad with num-lock off.
// In that case, EF_EXTENDED will not be set; if it is set, the key event
// originated from the relevant non-numpad dedicated key, e.g. [Insert].
return (!(flags() & EF_EXTENDED) &&
(key == VKEY_INSERT || key == VKEY_END || key == VKEY_DOWN ||
key == VKEY_NEXT || key == VKEY_LEFT || key == VKEY_CLEAR ||
key == VKEY_RIGHT || key == VKEY_HOME || key == VKEY_UP ||
key == VKEY_PRIOR));
#else
return false;
#endif
}
void KeyEvent::NormalizeFlags() {
int mask = 0;
switch (key_code()) {
case VKEY_CONTROL:
mask = EF_CONTROL_DOWN;
break;
case VKEY_SHIFT:
mask = EF_SHIFT_DOWN;
break;
case VKEY_MENU:
mask = EF_ALT_DOWN;
break;
case VKEY_CAPITAL:
mask = EF_CAPS_LOCK_DOWN;
break;
default:
return;
}
if (type() == ET_KEY_PRESSED)
set_flags(flags() | mask);
else
set_flags(flags() & ~mask);
}
bool KeyEvent::IsTranslated() const {
switch (type()) {
case ET_KEY_PRESSED:
case ET_KEY_RELEASED:
return false;
case ET_TRANSLATED_KEY_PRESS:
case ET_TRANSLATED_KEY_RELEASE:
return true;
default:
NOTREACHED();
return false;
}
}
void KeyEvent::SetTranslated(bool translated) {
switch (type()) {
case ET_KEY_PRESSED:
case ET_TRANSLATED_KEY_PRESS:
SetType(translated ? ET_TRANSLATED_KEY_PRESS : ET_KEY_PRESSED);
break;
case ET_KEY_RELEASED:
case ET_TRANSLATED_KEY_RELEASE:
SetType(translated ? ET_TRANSLATED_KEY_RELEASE : ET_KEY_RELEASED);
break;
default:
NOTREACHED();
}
}
////////////////////////////////////////////////////////////////////////////////
// ScrollEvent
ScrollEvent::ScrollEvent(const base::NativeEvent& native_event)
: MouseEvent(native_event) {
if (type() == ET_SCROLL) {
GetScrollOffsets(native_event,
&x_offset_, &y_offset_,
&x_offset_ordinal_, &y_offset_ordinal_,
&finger_count_);
} else if (type() == ET_SCROLL_FLING_START ||
type() == ET_SCROLL_FLING_CANCEL) {
GetFlingData(native_event,
&x_offset_, &y_offset_,
&x_offset_ordinal_, &y_offset_ordinal_,
NULL);
} else {
NOTREACHED() << "Unexpected event type " << type()
<< " when constructing a ScrollEvent.";
}
}
ScrollEvent::ScrollEvent(EventType type,
const gfx::PointF& location,
base::TimeDelta time_stamp,
int flags,
float x_offset,
float y_offset,
float x_offset_ordinal,
float y_offset_ordinal,
int finger_count)
: MouseEvent(type, location, location, flags, 0),
x_offset_(x_offset),
y_offset_(y_offset),
x_offset_ordinal_(x_offset_ordinal),
y_offset_ordinal_(y_offset_ordinal),
finger_count_(finger_count) {
set_time_stamp(time_stamp);
CHECK(IsScrollEvent());
}
void ScrollEvent::Scale(const float factor) {
x_offset_ *= factor;
y_offset_ *= factor;
x_offset_ordinal_ *= factor;
y_offset_ordinal_ *= factor;
}
////////////////////////////////////////////////////////////////////////////////
// GestureEvent
GestureEvent::GestureEvent(EventType type,
float x,
float y,
int flags,
base::TimeDelta time_stamp,
const GestureEventDetails& details,
unsigned int touch_ids_bitfield)
: LocatedEvent(type,
gfx::PointF(x, y),
gfx::PointF(x, y),
time_stamp,
flags | EF_FROM_TOUCH),
details_(details),
touch_ids_bitfield_(touch_ids_bitfield) {
}
GestureEvent::~GestureEvent() {
}
int GestureEvent::GetLowestTouchId() const {
if (touch_ids_bitfield_ == 0)
return -1;
int i = -1;
// Find the index of the least significant 1 bit
while (!(1 << ++i & touch_ids_bitfield_));
return i;
}
} // namespace ui