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/*
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
* Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2003, 2005, 2006, 2008, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2013 Samsung Electronics. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "third_party/blink/renderer/core/events/wheel_event.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_wheel_event_init.h"
#include "third_party/blink/renderer/core/clipboard/data_transfer.h"
#include "third_party/blink/renderer/core/dom/events/event_dispatcher.h"
#include "third_party/blink/renderer/core/event_interface_names.h"
#include "third_party/blink/renderer/core/frame/intervention.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
namespace blink {
namespace {
unsigned ConvertDeltaMode(const WebMouseWheelEvent& event) {
// WebMouseWheelEvent only supports these units for the delta.
DCHECK(event.delta_units == ui::ScrollGranularity::kScrollByPage ||
event.delta_units == ui::ScrollGranularity::kScrollByPixel ||
event.delta_units == ui::ScrollGranularity::kScrollByPrecisePixel);
return event.delta_units == ui::ScrollGranularity::kScrollByPage
? WheelEvent::kDomDeltaPage
: WheelEvent::kDomDeltaPixel;
}
MouseEventInit* GetMouseEventInitForWheel(const WebMouseWheelEvent& event,
LocalDOMWindow& window) {
MouseEventInit* initializer = MouseEventInit::Create();
initializer->setBubbles(true);
initializer->setCancelable(event.IsCancelable());
MouseEvent::SetCoordinatesFromWebPointerProperties(event.FlattenTransform(),
&window, initializer);
initializer->setButton(static_cast<int16_t>(event.button));
initializer->setButtons(
MouseEvent::WebInputEventModifiersToButtons(event.GetModifiers()));
initializer->setView(&window);
initializer->setComposed(true);
initializer->setDetail(event.click_count);
UIEventWithKeyState::SetFromWebInputEventModifiers(
initializer, static_cast<WebInputEvent::Modifiers>(event.GetModifiers()));
// TODO(zino): Should support canvas hit region because the
// wheel event is a kind of mouse event. Please see
// http://crbug.com/594075
return initializer;
}
} // namespace
WheelEvent* WheelEvent::Create(const WebMouseWheelEvent& event,
LocalDOMWindow& window) {
return MakeGarbageCollected<WheelEvent>(event, window);
}
WheelEvent* WheelEvent::Create(const WebMouseWheelEvent& event,
const gfx::Vector2dF& delta_in_pixels,
LocalDOMWindow& window) {
return MakeGarbageCollected<WheelEvent>(event, delta_in_pixels, window);
}
WheelEvent::WheelEvent()
: delta_x_(0), delta_y_(0), delta_z_(0), delta_mode_(kDomDeltaPixel) {}
// crbug.com/1173525: tweak the initialization behavior.
WheelEvent::WheelEvent(const AtomicString& type,
const WheelEventInit* initializer)
: MouseEvent(type, initializer),
wheel_delta_(
initializer->wheelDeltaX() ? initializer->wheelDeltaX()
: ClampTo<int32_t>(initializer->deltaX()),
initializer->wheelDeltaY() ? initializer->wheelDeltaY()
: ClampTo<int32_t>(initializer->deltaY())),
delta_x_(initializer->deltaX() ? initializer->deltaX()
: ClampTo<int32_t>(-static_cast<double>(
initializer->wheelDeltaX()))),
delta_y_(initializer->deltaY() ? initializer->deltaY()
: ClampTo<int32_t>(-static_cast<double>(
initializer->wheelDeltaY()))),
delta_z_(initializer->deltaZ()),
delta_mode_(initializer->deltaMode()) {}
WheelEvent::WheelEvent(const WebMouseWheelEvent& event, LocalDOMWindow& window)
: MouseEvent(event_type_names::kWheel,
GetMouseEventInitForWheel(event, window),
event.TimeStamp()),
wheel_delta_(
(event.wheel_ticks_x * kTickMultiplier) / window.devicePixelRatio(),
(event.wheel_ticks_y * kTickMultiplier) / window.devicePixelRatio()),
delta_x_(-event.DeltaXInRootFrame() / window.devicePixelRatio()),
delta_y_(-event.DeltaYInRootFrame() / window.devicePixelRatio()),
delta_z_(0),
delta_mode_(ConvertDeltaMode(event)),
native_event_(event) {}
WheelEvent::WheelEvent(const WebMouseWheelEvent& event,
const gfx::Vector2dF& delta_in_pixels,
LocalDOMWindow& window)
: MouseEvent(event_type_names::kWheel,
GetMouseEventInitForWheel(event, window),
event.TimeStamp()),
wheel_delta_(event.wheel_ticks_x * kTickMultiplier,
event.wheel_ticks_y * kTickMultiplier),
delta_x_(delta_in_pixels.x()),
delta_y_(delta_in_pixels.y()),
delta_z_(0),
delta_mode_(WheelEvent::kDomDeltaPixel),
native_event_(event) {}
const AtomicString& WheelEvent::InterfaceName() const {
return event_interface_names::kWheelEvent;
}
bool WheelEvent::IsMouseEvent() const {
return false;
}
bool WheelEvent::IsWheelEvent() const {
return true;
}
void WheelEvent::preventDefault() {
MouseEvent::preventDefault();
PassiveMode passive_mode = HandlingPassive();
if (passive_mode == PassiveMode::kPassiveForcedDocumentLevel) {
String id = "PreventDefaultPassive";
String message =
"Unable to preventDefault inside passive event listener due to "
"target being treated as passive. See "
"https://www.chromestatus.com/feature/6662647093133312";
auto* local_dom_window = DynamicTo<LocalDOMWindow>(view());
if (local_dom_window && local_dom_window->GetFrame()) {
Intervention::GenerateReport(local_dom_window->GetFrame(), id, message);
}
}
if (!currentTarget() || !currentTarget()->IsTopLevelNode())
return;
if (passive_mode == PassiveMode::kPassiveForcedDocumentLevel ||
passive_mode == PassiveMode::kNotPassiveDefault) {
if (ExecutionContext* context = currentTarget()->GetExecutionContext()) {
UseCounter::Count(
context,
WebFeature::kDocumentLevelPassiveDefaultEventListenerPreventedWheel);
}
}
}
DispatchEventResult WheelEvent::DispatchEvent(EventDispatcher& dispatcher) {
return dispatcher.Dispatch();
}
void WheelEvent::Trace(Visitor* visitor) const {
MouseEvent::Trace(visitor);
}
} // namespace blink
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