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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "ui/events/gesture_detection/gesture_event_data_packet.h"
#include "ui/events/gesture_detection/gesture_provider.h"
#include "ui/events/gesture_detection/touch_disposition_gesture_filter.h"
namespace ui {
// Provides filtered gesture detection and dispatch given a sequence of touch
// events and touch event acks.
class GESTURE_DETECTION_EXPORT FilteredGestureProvider
: public ui::TouchDispositionGestureFilterClient,
public ui::GestureProviderClient {
// |client| will be offered all gestures detected by the |gesture_provider_|
// and allowed by the |gesture_filter_|.
FilteredGestureProvider(const GestureProvider::Config& config,
GestureProviderClient* client);
struct TouchHandlingResult {
// True if |event| was both valid and successfully handled by the
// gesture provider. Otherwise, false, in which case the caller should drop
// |event| and cease further propagation.
bool succeeded;
// Whether |event| occurred beyond the touch slop region.
bool moved_beyond_slop_region;
TouchHandlingResult OnTouchEvent(const MotionEvent& event) WARN_UNUSED_RESULT;
// To be called upon asynchronous and synchronous ack of an event that was
// forwarded after a successful call to |OnTouchEvent()|.
void OnTouchEventAck(uint32_t unique_event_id, bool event_consumed);
// Methods delegated to |gesture_provider_|.
void ResetDetection();
void SetMultiTouchZoomSupportEnabled(bool enabled);
void SetDoubleTapSupportForPlatformEnabled(bool enabled);
void SetDoubleTapSupportForPageEnabled(bool enabled);
const ui::MotionEvent* GetCurrentDownEvent() const;
// GestureProviderClient implementation.
void OnGestureEvent(const ui::GestureEventData& event) override;
// TouchDispositionGestureFilterClient implementation.
void ForwardGestureEvent(const ui::GestureEventData& event) override;
GestureProviderClient* const client_;
ui::GestureProvider gesture_provider_;
ui::TouchDispositionGestureFilter gesture_filter_;
bool handling_event_;
bool any_touch_moved_beyond_slop_region_;
ui::GestureEventDataPacket pending_gesture_packet_;
} // namespace ui