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// Copyright 2025 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_VIZ_SERVICE_INPUT_ANDROID_STATE_TRANSFER_HANDLER_H_
#define COMPONENTS_VIZ_SERVICE_INPUT_ANDROID_STATE_TRANSFER_HANDLER_H_
#include <optional>
#include "base/containers/queue.h"
#include "base/memory/weak_ptr.h"
#include "base/metrics/histogram_functions.h"
#include "components/input/android/android_input_callback.h"
#include "components/input/render_input_router.mojom.h"
#include "components/viz/common/surfaces/frame_sink_id.h"
#include "components/viz/service/input/render_input_router_support_android.h"
#include "components/viz/service/viz_service_export.h"
namespace viz {
class AndroidStateTransferHandlerClient {
public:
virtual bool TransferInputBackToBrowser() = 0;
};
// AndroidStateTransferHandler listens to input events coming from Android
// platform and receives |TouchTransferState| coming from Browser. Input events
// are queued until state for corresponding touch sequence is received from
// Browser, similarly state is queued until we started receiving input events
// from Android platform.
class VIZ_SERVICE_EXPORT AndroidStateTransferHandler
: public input::AndroidInputCallbackClient {
public:
explicit AndroidStateTransferHandler(
AndroidStateTransferHandlerClient& client);
~AndroidStateTransferHandler();
// `root_frame_sink_id` could be invalid. In cases when root frame sink is
// destroyed and there was an ongoing touch sequence, OS may send a few events
// before a touch cancel is sent for the ongoing touch sequence -
// https://crbug.com/388478270#comment2 for more context.
bool OnMotionEvent(base::android::ScopedInputEvent input_event,
const FrameSinkId& root_frame_sink_id) override;
// `rir_support`: RenderInputRouterSupport corresponding to root widget's
// FrameSinkId in TouchTransferState. `rir_support` can be null at the start
// or in the middle of sequence in case CompositorFrameSink got destroyed.
void StateOnTouchTransfer(
input::mojom::TouchTransferStatePtr state,
base::WeakPtr<RenderInputRouterSupportAndroidInterface> rir_support);
size_t GetEventsBufferSizeForTesting() const { return events_buffer_.size(); }
size_t GetPendingTransferredStatesSizeForTesting() const {
return pending_transferred_states_.size();
}
static constexpr const char* kPendingTransfersHistogramNonNull =
"Android.InputOnViz.Viz.PendingStateTransfers.NonNullCurrentState";
static constexpr const char* kPendingTransfersHistogramNull =
"Android.InputOnViz.Viz.PendingStateTransfers.NullCurrentState";
static constexpr const char* kDroppedNonTouchActions =
"Android.InputOnViz.Viz.DroppedNonTouchActions";
private:
bool IsExpectedMotionEventAction(int action);
bool CanStartProcessingVizEvents(
const base::android::ScopedInputEvent& event);
void HandleTouchEvent(base::android::ScopedInputEvent input_event);
void MaybeDropEventsFromEarlierSequences(
const input::mojom::TouchTransferStatePtr& state);
void EmitPendingTransfersHistogram();
void ValidateRootFrameSinkId(const FrameSinkId& root_frame_sink_id);
bool ignore_remaining_touch_sequence_ = false;
struct TransferState {
TransferState(
base::WeakPtr<RenderInputRouterSupportAndroidInterface> support,
input::mojom::TouchTransferStatePtr transfer_state);
TransferState(TransferState&& other);
~TransferState();
base::WeakPtr<RenderInputRouterSupportAndroidInterface> rir_support;
input::mojom::TouchTransferStatePtr transfer_state;
};
// State corresponding to active touch sequence.
std::optional<TransferState> state_for_curr_sequence_ = std::nullopt;
// The list maintains sorted order by key `TouchTransferState.down_time_ms`.
// Any state transfer received out of order is dropped.
base::queue<TransferState> pending_transferred_states_;
static constexpr int kMaxPendingTransferredStates = 3;
// Stores input events until we have received state from Browser for the
// currently transferred touch sequence.
base::queue<base::android::ScopedInputEvent> events_buffer_;
const raw_ref<AndroidStateTransferHandlerClient> client_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_INPUT_ANDROID_STATE_TRANSFER_HANDLER_H_
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