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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_INPUT_TOUCHPAD_PINCH_EVENT_QUEUE_H_
#define COMPONENTS_INPUT_TOUCHPAD_PINCH_EVENT_QUEUE_H_
#include <memory>
#include <optional>
#include "base/component_export.h"
#include "base/containers/circular_deque.h"
#include "base/memory/raw_ptr.h"
#include "components/input/dispatch_to_renderer_callback.h"
#include "components/input/event_with_latency_info.h"
#include "third_party/blink/public/common/input/web_input_event.h"
#include "third_party/blink/public/mojom/input/input_event_result.mojom-shared.h"
namespace input {
class QueuedTouchpadPinchEvent;
// Interface with which TouchpadPinchEventQueue can forward synthetic mouse
// wheel events and notify of pinch events.
class COMPONENT_EXPORT(INPUT) TouchpadPinchEventQueueClient {
public:
virtual ~TouchpadPinchEventQueueClient() = default;
using MouseWheelEventHandledCallback = base::OnceCallback<void(
const MouseWheelEventWithLatencyInfo& event,
blink::mojom::InputEventResultSource ack_source,
blink::mojom::InputEventResultState ack_result)>;
virtual void SendMouseWheelEventForPinchImmediately(
const blink::WebGestureEvent& pinch_event,
const MouseWheelEventWithLatencyInfo& event,
MouseWheelEventHandledCallback callback,
DispatchToRendererCallback& dispatch_callback) = 0;
virtual void OnGestureEventForPinchAck(
const GestureEventWithLatencyInfo& event,
blink::mojom::InputEventResultSource ack_source,
blink::mojom::InputEventResultState ack_result) = 0;
};
// A queue for sending synthetic mouse wheel events for touchpad pinches.
// In order for a page to prevent touchpad pinch zooming, we send synthetic
// wheel events which may be cancelled. Once we've determined whether a page
// has prevented the pinch, the TouchpadPinchEventQueueClient may proceed with
// handling the pinch.
// See README.md for further details.
class COMPONENT_EXPORT(INPUT) TouchpadPinchEventQueue {
public:
// The |client| must outlive the TouchpadPinchEventQueue.
TouchpadPinchEventQueue(TouchpadPinchEventQueueClient* client);
TouchpadPinchEventQueue(const TouchpadPinchEventQueue&) = delete;
TouchpadPinchEventQueue& operator=(const TouchpadPinchEventQueue&) = delete;
~TouchpadPinchEventQueue();
// Adds the given touchpad pinch |event| to the queue. The event may be
// coalesced with previously queued events.
void QueueEvent(const GestureEventWithLatencyInfo& event,
DispatchToRendererCallback& dispatch_callback);
[[nodiscard]] bool has_pending() const;
private:
// Notifies the queue that a synthetic mouse wheel event has been processed
// by the renderer.
void ProcessMouseWheelAck(
const MouseWheelEventWithLatencyInfo& ack_event,
blink::mojom::InputEventResultSource ack_source,
blink::mojom::InputEventResultState ack_result);
void TryForwardNextEventToRenderer();
raw_ptr<TouchpadPinchEventQueueClient> client_;
base::circular_deque<std::unique_ptr<QueuedTouchpadPinchEvent>> pinch_queue_;
std::unique_ptr<QueuedTouchpadPinchEvent> pinch_event_awaiting_ack_;
std::optional<bool> first_event_prevented_;
};
} // namespace input
#endif // COMPONENTS_INPUT_TOUCHPAD_PINCH_EVENT_QUEUE_H_
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