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content / browser / renderer_host / input / touch_emulator_impl.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/touch_emulator_impl.h"
#include <memory>
#include <utility>
#include "base/containers/queue.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "components/input/events_helper.h"
#include "components/input/render_widget_host_view_input.h"
#include "components/input/web_touch_event_traits.h"
#include "content/browser/renderer_host/input/motion_event_web.h"
#include "content/grit/content_resources.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "third_party/blink/public/common/input/web_keyboard_event.h"
#include "third_party/blink/public/common/input/web_mouse_event.h"
#include "ui/base/cursor/cursor.h"
#include "ui/base/cursor/mojom/cursor_type.mojom-shared.h"
#include "ui/base/mojom/menu_source_type.mojom.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/blink/blink_event_util.h"
#include "ui/events/gesture_detection/gesture_provider_config_helper.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/skia_conversions.h"
#include "ui/gfx/image/image.h"
using blink::WebGestureEvent;
using blink::WebInputEvent;
using blink::WebKeyboardEvent;
using blink::WebMouseEvent;
using blink::WebMouseWheelEvent;
using blink::WebTouchEvent;
using blink::WebTouchPoint;
namespace content {
namespace {
ui::GestureProvider::Config GetEmulatorGestureProviderConfig(
ui::GestureProviderConfigType config_type,
input::TouchEmulator::Mode mode) {
ui::GestureProvider::Config config =
ui::GetGestureProviderConfig(config_type);
config.gesture_begin_end_types_enabled = false;
config.gesture_detector_config.swipe_enabled = false;
config.gesture_detector_config.two_finger_tap_enabled = false;
if (mode == input::TouchEmulator::Mode::kInjectingTouchEvents) {
config.gesture_detector_config.longpress_timeout = base::TimeDelta::Max();
config.gesture_detector_config.showpress_timeout = base::TimeDelta::Max();
}
return config;
}
int ModifiersWithoutMouseButtons(const WebInputEvent& event) {
const int all_buttons = WebInputEvent::kLeftButtonDown |
WebInputEvent::kMiddleButtonDown |
WebInputEvent::kRightButtonDown;
return event.GetModifiers() & ~all_buttons;
}
// Time between two consecutive mouse moves, during which second mouse move
// is not converted to touch.
constexpr base::TimeDelta kMouseMoveDropInterval = base::Milliseconds(5);
} // namespace
TouchEmulatorImpl::TouchEmulatorImpl(input::TouchEmulatorClient* client,
float device_scale_factor)
: client_(client),
gesture_provider_config_type_(
ui::GestureProviderConfigType::CURRENT_PLATFORM),
double_tap_enabled_(true),
pinch_gesture_mode_for_testing_(false),
emulated_stream_active_sequence_count_(0),
native_stream_active_sequence_count_(0),
last_emulated_start_target_(nullptr),
pending_taps_count_(0) {
DCHECK(client_);
ResetState();
SetDeviceScaleFactor(device_scale_factor);
}
TouchEmulatorImpl::~TouchEmulatorImpl() {
// We cannot cleanup properly in destructor, as we need roundtrip to the
// renderer for ack. Instead, the owner should call Disable, and only
// destroy this object when renderer is dead.
}
void TouchEmulatorImpl::ResetState() {
last_mouse_event_was_move_ = false;
last_mouse_move_timestamp_ = base::TimeTicks();
mouse_pressed_ = false;
shift_pressed_ = false;
suppress_next_fling_cancel_ = false;
pinch_scale_ = 1.f;
pinch_gesture_active_ = false;
}
void TouchEmulatorImpl::Enable(Mode mode,
ui::GestureProviderConfigType config_type) {
if (gesture_provider_ && mode_ != mode)
client_->SetCursor(ui::mojom::CursorType::kPointer);
if (!gesture_provider_ || gesture_provider_config_type_ != config_type ||
mode_ != mode) {
mode_ = mode;
gesture_provider_config_type_ = config_type;
gesture_provider_ = std::make_unique<ui::FilteredGestureProvider>(
GetEmulatorGestureProviderConfig(config_type, mode), this);
gesture_provider_->SetDoubleTapSupportForPageEnabled(double_tap_enabled_);
// TODO(dgozman): Use synthetic secondary touch to support multi-touch.
gesture_provider_->SetMultiTouchZoomSupportEnabled(
mode != Mode::kEmulatingTouchFromMouse);
}
UpdateCursor();
}
void TouchEmulatorImpl::Disable() {
if (!IsEnabled())
return;
mode_ = Mode::kEmulatingTouchFromMouse;
CancelTouch();
gesture_provider_.reset();
base::queue<base::OnceClosure> empty;
injected_touch_completion_callbacks_.swap(empty);
client_->SetCursor(ui::mojom::CursorType::kPointer);
ResetState();
}
void TouchEmulatorImpl::SetDeviceScaleFactor(float device_scale_factor) {
// Make sure the scale factor corresponds to the one of the available cursor
// images.
const float cursor_scale_factor = device_scale_factor < 1.5f ? 1.0f : 2.0f;
if (cursor_scale_factor == cursor_scale_factor_) {
return;
}
cursor_scale_factor_ = cursor_scale_factor;
InitCursors();
if (IsEnabled())
UpdateCursor();
}
void TouchEmulatorImpl::SetDoubleTapSupportForPageEnabled(bool enabled) {
double_tap_enabled_ = enabled;
if (gesture_provider_)
gesture_provider_->SetDoubleTapSupportForPageEnabled(enabled);
}
bool TouchEmulatorImpl::IsEnabled() const {
return !!gesture_provider_;
}
void TouchEmulatorImpl::InitCursors() {
touch_cursor_ = InitCursorFromResource(
cursor_scale_factor_ == 1.0f ? IDR_DEVTOOLS_TOUCH_CURSOR_ICON
: IDR_DEVTOOLS_TOUCH_CURSOR_ICON_2X);
pinch_cursor_ = InitCursorFromResource(
cursor_scale_factor_ == 1.0f ? IDR_DEVTOOLS_PINCH_CURSOR_ICON
: IDR_DEVTOOLS_PINCH_CURSOR_ICON_2X);
// The touch cursor is bigger. Use its size in DIPs for both cursors.
cursor_size_ = gfx::ScaleSize(
gfx::SizeF(
gfx::SkISizeToSize(touch_cursor_.custom_bitmap().dimensions())),
1 / cursor_scale_factor_);
}
ui::Cursor TouchEmulatorImpl::InitCursorFromResource(int resource_id) {
const gfx::Image& cursor_image =
GetContentClient()->GetNativeImageNamed(resource_id);
SkBitmap bitmap = cursor_image.AsBitmap();
gfx::Point hotspot(bitmap.width() / 2, bitmap.height() / 2);
return ui::Cursor::NewCustom(std::move(bitmap), std::move(hotspot),
cursor_scale_factor_);
}
bool TouchEmulatorImpl::HandleMouseEvent(
const WebMouseEvent& mouse_event,
input::RenderWidgetHostViewInput* target_view) {
if (!IsEnabled() || mode_ != Mode::kEmulatingTouchFromMouse)
return false;
UpdateCursor();
if (mouse_event.button == WebMouseEvent::Button::kRight &&
mouse_event.GetType() == WebInputEvent::Type::kMouseDown) {
client_->ShowContextMenuAtPoint(
gfx::Point(mouse_event.PositionInWidget().x(),
mouse_event.PositionInWidget().y()),
ui::mojom::MenuSourceType::kMouse, target_view);
}
if (mouse_event.button != WebMouseEvent::Button::kLeft)
return true;
if (mouse_event.GetType() == WebInputEvent::Type::kMouseMove) {
if (last_mouse_event_was_move_ &&
mouse_event.TimeStamp() <
last_mouse_move_timestamp_ + kMouseMoveDropInterval)
return true;
last_mouse_event_was_move_ = true;
last_mouse_move_timestamp_ = mouse_event.TimeStamp();
} else {
last_mouse_event_was_move_ = false;
}
if (mouse_event.GetType() == WebInputEvent::Type::kMouseDown)
mouse_pressed_ = true;
else if (mouse_event.GetType() == WebInputEvent::Type::kMouseUp)
mouse_pressed_ = false;
UpdateShiftPressed((mouse_event.GetModifiers() & WebInputEvent::kShiftKey) !=
0);
if (mouse_event.GetType() != WebInputEvent::Type::kMouseDown &&
mouse_event.GetType() != WebInputEvent::Type::kMouseMove &&
mouse_event.GetType() != WebInputEvent::Type::kMouseUp) {
return true;
}
gfx::PointF pos_in_root = mouse_event.PositionInWidget();
if (target_view)
pos_in_root = target_view->TransformPointToRootCoordSpaceF(pos_in_root);
FillTouchEventAndPoint(mouse_event, pos_in_root);
HandleEmulatedTouchEvent(touch_event_, target_view);
// Do not pass mouse events to the renderer.
return true;
}
bool TouchEmulatorImpl::HandleMouseWheelEvent(const WebMouseWheelEvent& event) {
if (!IsEnabled() || mode_ != Mode::kEmulatingTouchFromMouse)
return false;
// Send mouse wheel for easy scrolling when there is no active touch.
return emulated_stream_active_sequence_count_ > 0;
}
bool TouchEmulatorImpl::HandleKeyboardEvent(const WebKeyboardEvent& event) {
if (!IsEnabled() || mode_ != Mode::kEmulatingTouchFromMouse)
return false;
if (!UpdateShiftPressed((event.GetModifiers() & WebInputEvent::kShiftKey) !=
0))
return false;
if (!mouse_pressed_)
return false;
// Note: The necessary pinch events will be lazily inserted by
// |OnGestureEvent| depending on the state of |shift_pressed_|, using the
// scroll stream as the event driver.
if (shift_pressed_) {
// TODO(dgozman): Add secondary touch point and set anchor.
} else {
// TODO(dgozman): Remove secondary touch point and anchor.
}
// Never block keyboard events.
return false;
}
bool TouchEmulatorImpl::HandleTouchEvent(const blink::WebTouchEvent& event) {
// Block native event when emulated touch stream is active.
if (emulated_stream_active_sequence_count_)
return true;
bool is_sequence_start = event.IsTouchSequenceStart();
// Do not allow middle-sequence event to pass through, if start was blocked.
if (!native_stream_active_sequence_count_ && !is_sequence_start)
return true;
if (is_sequence_start)
native_stream_active_sequence_count_++;
return false;
}
bool TouchEmulatorImpl::HandleEmulatedTouchEvent(
blink::WebTouchEvent event,
input::RenderWidgetHostViewInput* target_view) {
DCHECK(gesture_provider_);
event.unique_touch_event_id = ui::GetNextTouchEventId();
auto result = gesture_provider_->OnTouchEvent(MotionEventWeb(event));
if (!result.succeeded)
return true;
const bool event_consumed = true;
const bool is_source_touch_event_set_blocking = false;
// Block emulated event when emulated native stream is active.
if (native_stream_active_sequence_count_) {
gesture_provider_->OnTouchEventAck(event.unique_touch_event_id,
event_consumed,
is_source_touch_event_set_blocking);
return true;
}
bool is_sequence_start = event.IsTouchSequenceStart();
// Do not allow middle-sequence event to pass through, if start was blocked.
if (!emulated_stream_active_sequence_count_ && !is_sequence_start) {
gesture_provider_->OnTouchEventAck(event.unique_touch_event_id,
event_consumed,
is_source_touch_event_set_blocking);
return true;
}
if (is_sequence_start) {
emulated_stream_active_sequence_count_++;
last_emulated_start_target_ = target_view;
}
event.moved_beyond_slop_region = result.moved_beyond_slop_region;
client_->ForwardEmulatedTouchEvent(event, target_view);
return false;
}
bool TouchEmulatorImpl::HandleTouchEventAck(
const blink::WebTouchEvent& event,
blink::mojom::InputEventResultState ack_result) {
bool is_sequence_end = event.IsTouchSequenceEnd();
if (emulated_stream_active_sequence_count_) {
if (is_sequence_end)
emulated_stream_active_sequence_count_--;
int taps_count_before = pending_taps_count_;
const bool event_consumed =
ack_result == blink::mojom::InputEventResultState::kConsumed;
if (gesture_provider_) {
gesture_provider_->OnTouchEventAck(
event.unique_touch_event_id, event_consumed,
input::InputEventResultStateIsSetBlocking(ack_result));
}
if (pending_taps_count_ == taps_count_before)
OnInjectedTouchCompleted();
return true;
}
// We may have not seen native touch sequence start (when created in the
// middle of a sequence), so don't decrement sequence count below zero.
if (is_sequence_end && native_stream_active_sequence_count_)
native_stream_active_sequence_count_--;
return false;
}
void TouchEmulatorImpl::OnGestureEventAck(const WebGestureEvent& event,
input::RenderWidgetHostViewInput*) {
if (event.GetType() != WebInputEvent::Type::kGestureTap)
return;
if (pending_taps_count_) {
pending_taps_count_--;
OnInjectedTouchCompleted();
}
}
void TouchEmulatorImpl::OnViewDestroyed(
input::RenderWidgetHostViewInput* destroyed_view) {
if (destroyed_view != last_emulated_start_target_)
return;
emulated_stream_active_sequence_count_ = 0;
last_emulated_start_target_ = nullptr;
// If we aren't enabled, we can just stop here.
if (!IsEnabled()) {
return;
}
// TouchEmulator is still enabled. To reset the state go through a
// Disable/Enable sequence to destroy the GestureRecognizer otherwise it will
// be left in an unknown state because the associated view was destroyed.
ui::GestureProviderConfigType config_type = gesture_provider_config_type_;
Mode mode = mode_;
Disable();
Enable(mode, config_type);
}
void TouchEmulatorImpl::OnGestureEvent(const ui::GestureEventData& gesture) {
WebGestureEvent gesture_event =
ui::CreateWebGestureEventFromGestureEventData(gesture);
DCHECK(gesture_event.unique_touch_event_id);
switch (gesture_event.GetType()) {
case WebInputEvent::Type::kUndefined:
NOTREACHED_IN_MIGRATION() << "Undefined WebInputEvent type";
// Bail without sending the junk event to the client.
return;
case WebInputEvent::Type::kGestureScrollBegin:
client_->ForwardEmulatedGestureEvent(gesture_event);
// PinchBegin must always follow ScrollBegin.
if (InPinchGestureMode())
PinchBegin(gesture_event);
break;
case WebInputEvent::Type::kGestureScrollUpdate:
if (InPinchGestureMode()) {
// Convert scrolls to pinches while shift is pressed.
if (!pinch_gesture_active_)
PinchBegin(gesture_event);
else
PinchUpdate(gesture_event);
} else {
// Pass scroll update further. If shift was released, end the pinch.
if (pinch_gesture_active_)
PinchEnd(gesture_event);
client_->ForwardEmulatedGestureEvent(gesture_event);
}
break;
case WebInputEvent::Type::kGestureScrollEnd:
// PinchEnd must precede ScrollEnd.
if (pinch_gesture_active_)
PinchEnd(gesture_event);
client_->ForwardEmulatedGestureEvent(gesture_event);
break;
case WebInputEvent::Type::kGestureFlingStart:
// PinchEnd must precede FlingStart.
if (pinch_gesture_active_)
PinchEnd(gesture_event);
if (InPinchGestureMode()) {
// No fling in pinch mode. Forward scroll end instead of fling start.
suppress_next_fling_cancel_ = true;
ScrollEnd(gesture_event);
} else {
suppress_next_fling_cancel_ = false;
client_->ForwardEmulatedGestureEvent(gesture_event);
}
break;
case WebInputEvent::Type::kGestureFlingCancel:
// If fling start was suppressed, we should not send fling cancel either.
if (!suppress_next_fling_cancel_)
client_->ForwardEmulatedGestureEvent(gesture_event);
suppress_next_fling_cancel_ = false;
break;
case WebInputEvent::Type::kGestureTap:
pending_taps_count_++;
client_->ForwardEmulatedGestureEvent(gesture_event);
break;
default:
// Everything else goes through.
client_->ForwardEmulatedGestureEvent(gesture_event);
}
}
bool TouchEmulatorImpl::RequiresDoubleTapGestureEvents() const {
return true;
}
void TouchEmulatorImpl::InjectTouchEvent(
const blink::WebTouchEvent& event,
input::RenderWidgetHostViewInput* target_view,
base::OnceClosure callback) {
DCHECK(IsEnabled() && mode_ == Mode::kInjectingTouchEvents);
touch_event_ = event;
injected_touch_completion_callbacks_.push(std::move(callback));
if (HandleEmulatedTouchEvent(touch_event_, target_view))
OnInjectedTouchCompleted();
}
void TouchEmulatorImpl::OnInjectedTouchCompleted() {
if (injected_touch_completion_callbacks_.empty()) {
return;
}
if (!injected_touch_completion_callbacks_.front().is_null()) {
std::move(injected_touch_completion_callbacks_.front()).Run();
}
injected_touch_completion_callbacks_.pop();
}
void TouchEmulatorImpl::CancelTouch() {
if (!emulated_stream_active_sequence_count_ || !IsEnabled() ||
mode_ != Mode::kEmulatingTouchFromMouse) {
return;
}
input::WebTouchEventTraits::ResetTypeAndTouchStates(
WebInputEvent::Type::kTouchCancel, ui::EventTimeForNow(), &touch_event_);
DCHECK(gesture_provider_);
if (gesture_provider_->GetCurrentDownEvent())
HandleEmulatedTouchEvent(touch_event_, last_emulated_start_target_);
}
void TouchEmulatorImpl::UpdateCursor() {
DCHECK(IsEnabled());
if (mode_ == Mode::kEmulatingTouchFromMouse)
client_->SetCursor(InPinchGestureMode() ? pinch_cursor_ : touch_cursor_);
}
bool TouchEmulatorImpl::UpdateShiftPressed(bool shift_pressed) {
DCHECK(IsEnabled() && mode_ == Mode::kEmulatingTouchFromMouse);
if (shift_pressed_ == shift_pressed)
return false;
shift_pressed_ = shift_pressed;
UpdateCursor();
return true;
}
void TouchEmulatorImpl::PinchBegin(const WebGestureEvent& event) {
DCHECK(InPinchGestureMode());
DCHECK(!pinch_gesture_active_);
pinch_gesture_active_ = true;
pinch_anchor_ = event.PositionInWidget();
pinch_scale_ = 1.f;
WebGestureEvent pinch_event =
GetPinchGestureEvent(WebInputEvent::Type::kGesturePinchBegin, event);
client_->ForwardEmulatedGestureEvent(pinch_event);
}
void TouchEmulatorImpl::PinchUpdate(const WebGestureEvent& event) {
DCHECK(pinch_gesture_active_);
float dy = pinch_anchor_.y() - event.PositionInWidget().y();
float scale = exp(dy * 0.002f);
WebGestureEvent pinch_event =
GetPinchGestureEvent(WebInputEvent::Type::kGesturePinchUpdate, event);
pinch_event.data.pinch_update.scale = scale / pinch_scale_;
client_->ForwardEmulatedGestureEvent(pinch_event);
pinch_scale_ = scale;
}
void TouchEmulatorImpl::PinchEnd(const WebGestureEvent& event) {
DCHECK(pinch_gesture_active_);
pinch_gesture_active_ = false;
WebGestureEvent pinch_event =
GetPinchGestureEvent(WebInputEvent::Type::kGesturePinchEnd, event);
client_->ForwardEmulatedGestureEvent(pinch_event);
}
void TouchEmulatorImpl::ScrollEnd(const WebGestureEvent& event) {
WebGestureEvent scroll_event(WebInputEvent::Type::kGestureScrollEnd,
ModifiersWithoutMouseButtons(event),
event.TimeStamp(),
blink::WebGestureDevice::kTouchscreen);
scroll_event.unique_touch_event_id = event.unique_touch_event_id;
client_->ForwardEmulatedGestureEvent(scroll_event);
}
WebGestureEvent TouchEmulatorImpl::GetPinchGestureEvent(
WebInputEvent::Type type,
const WebGestureEvent& original_event) {
WebGestureEvent event(type, ModifiersWithoutMouseButtons(original_event),
original_event.TimeStamp(),
blink::WebGestureDevice::kTouchscreen);
event.SetPositionInWidget(pinch_anchor_);
event.unique_touch_event_id = original_event.unique_touch_event_id;
return event;
}
void TouchEmulatorImpl::FillTouchEventAndPoint(const WebMouseEvent& mouse_event,
const gfx::PointF& pos_in_root) {
WebInputEvent::Type eventType;
switch (mouse_event.GetType()) {
case WebInputEvent::Type::kMouseDown:
eventType = WebInputEvent::Type::kTouchStart;
break;
case WebInputEvent::Type::kMouseMove:
eventType = WebInputEvent::Type::kTouchMove;
break;
case WebInputEvent::Type::kMouseUp:
eventType = WebInputEvent::Type::kTouchEnd;
break;
default:
eventType = WebInputEvent::Type::kUndefined;
NOTREACHED_IN_MIGRATION()
<< "Invalid event for touch emulation: " << mouse_event.GetType();
}
touch_event_.touches_length = 1;
touch_event_.SetModifiers(ModifiersWithoutMouseButtons(mouse_event));
input::WebTouchEventTraits::ResetTypeAndTouchStates(
eventType, mouse_event.TimeStamp(), &touch_event_);
WebTouchPoint& point = touch_event_.touches[0];
point.id = 0;
point.radius_x = 0.5f * cursor_size_.width();
point.radius_y = 0.5f * cursor_size_.height();
point.force = eventType == WebInputEvent::Type::kTouchEnd ? 0.f : 1.f;
point.rotation_angle = 0.f;
// We need to convert this to the root-view's coord space, otherwise the
// GestureRecognizer will potentially receive events for a moving widget,
// for example when scroll bubbling is taking place. The GestureRecognizer
// isn't designed to handle that.
point.SetPositionInWidget(pos_in_root);
point.SetPositionInScreen(mouse_event.PositionInScreen().x(),
mouse_event.PositionInScreen().y());
point.tilt_x = 0;
point.tilt_y = 0;
point.pointer_type = blink::WebPointerProperties::PointerType::kTouch;
}
bool TouchEmulatorImpl::InPinchGestureMode() const {
return shift_pressed_ || pinch_gesture_mode_for_testing_;
}
void TouchEmulatorImpl::SetPinchGestureModeForTesting(bool pinch_gesture_mode) {
pinch_gesture_mode_for_testing_ = pinch_gesture_mode;
}
} // namespace content