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/*
* Copyright 2008, The Android Open Source Project
* Copyright (C) 2012 Research In Motion Limited. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/core/events/touch_event.h"
#include "third_party/blink/public/common/input/web_coalesced_input_event.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_touch_event_init.h"
#include "third_party/blink/renderer/core/dom/events/event_dispatcher.h"
#include "third_party/blink/renderer/core/dom/events/event_path.h"
#include "third_party/blink/renderer/core/event_interface_names.h"
#include "third_party/blink/renderer/core/frame/frame_console.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/local_frame_view.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/core/html/html_element.h"
#include "third_party/blink/renderer/core/input/input_device_capabilities.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h"
#include "third_party/blink/renderer/platform/bindings/dom_wrapper_world.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/instrumentation/histogram.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
namespace blink {
namespace {
// Helper function to get WebTouchEvent from WebCoalescedInputEvent.
const WebTouchEvent* GetWebTouchEvent(const WebCoalescedInputEvent& event) {
return static_cast<const WebTouchEvent*>(&event.Event());
}
} // namespace
TouchEvent::TouchEvent() : current_touch_action_(TouchAction::kAuto) {}
TouchEvent::TouchEvent(const WebCoalescedInputEvent& event,
TouchList* touches,
TouchList* target_touches,
TouchList* changed_touches,
const AtomicString& type,
AbstractView* view,
TouchAction current_touch_action)
// Pass a sourceCapabilities including the ability to fire touchevents when
// creating this touchevent, which is always created from input device
// capabilities from EventHandler.
: UIEventWithKeyState(
type,
Bubbles::kYes,
GetWebTouchEvent(event)->IsCancelable() ? Cancelable::kYes
: Cancelable::kNo,
view,
0,
static_cast<WebInputEvent::Modifiers>(event.Event().GetModifiers()),
event.Event().TimeStamp(),
view ? view->GetInputDeviceCapabilities()->FiresTouchEvents(true)
: nullptr),
touches_(touches),
target_touches_(target_touches),
changed_touches_(changed_touches),
current_touch_action_(current_touch_action) {
DCHECK(WebInputEvent::IsTouchEventType(event.Event().GetType()));
native_event_.reset(new WebCoalescedInputEvent(event));
}
TouchEvent::TouchEvent(const AtomicString& type,
const TouchEventInit* initializer)
: UIEventWithKeyState(type, initializer),
touches_(TouchList::Create(initializer->touches())),
target_touches_(TouchList::Create(initializer->targetTouches())),
changed_touches_(TouchList::Create(initializer->changedTouches())),
current_touch_action_(TouchAction::kAuto) {}
TouchEvent::~TouchEvent() = default;
const AtomicString& TouchEvent::InterfaceName() const {
return event_interface_names::kTouchEvent;
}
bool TouchEvent::IsTouchEvent() const {
return true;
}
void TouchEvent::preventDefault() {
UIEventWithKeyState::preventDefault();
// A common developer error is to wait too long before attempting to stop
// scrolling by consuming a touchmove event. Generate an error if this
// event is uncancelable.
String id;
String message;
switch (HandlingPassive()) {
case PassiveMode::kNotPassive:
case PassiveMode::kNotPassiveDefault:
if (!cancelable()) {
id = "IgnoredEventCancel";
message = "Ignored attempt to cancel a " + type() +
" event with cancelable=false, for example "
"because scrolling is in progress and "
"cannot be interrupted.";
}
break;
case PassiveMode::kPassiveForcedDocumentLevel:
// Only enable the warning when the current touch action is auto because
// an author may use touch action but call preventDefault for interop with
// browsers that don't support touch-action.
if (current_touch_action_ == TouchAction::kAuto) {
id = "PreventDefaultPassive";
message =
"Unable to preventDefault inside passive event listener due to "
"target being treated as passive. See "
"https://www.chromestatus.com/features/5093566007214080";
}
break;
default:
break;
}
auto* local_dom_window = DynamicTo<LocalDOMWindow>(view());
if (!message.IsEmpty() && local_dom_window && local_dom_window->GetFrame()) {
Intervention::GenerateReport(local_dom_window->GetFrame(), id, message);
}
if ((type() == event_type_names::kTouchstart ||
type() == event_type_names::kTouchmove) &&
local_dom_window) {
auto* local_frame = DynamicTo<LocalFrame>(view()->GetFrame());
if (local_frame && current_touch_action_ == TouchAction::kAuto) {
switch (HandlingPassive()) {
case PassiveMode::kNotPassiveDefault:
UseCounter::Count(local_dom_window->document(),
WebFeature::kTouchEventPreventedNoTouchAction);
break;
case PassiveMode::kPassiveForcedDocumentLevel:
UseCounter::Count(
local_dom_window->document(),
WebFeature::
kTouchEventPreventedForcedDocumentPassiveNoTouchAction);
break;
default:
break;
}
}
}
}
bool TouchEvent::IsTouchStartOrFirstTouchMove() const {
if (!native_event_)
return false;
return GetWebTouchEvent(*native_event_)->touch_start_or_first_touch_move;
}
void TouchEvent::Trace(Visitor* visitor) {
visitor->Trace(touches_);
visitor->Trace(target_touches_);
visitor->Trace(changed_touches_);
UIEventWithKeyState::Trace(visitor);
}
DispatchEventResult TouchEvent::DispatchEvent(EventDispatcher& dispatcher) {
GetEventPath().AdjustForTouchEvent(*this);
return dispatcher.Dispatch();
}
} // namespace blink
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