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// Copyright 2012 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include <set>
#include <gtest/gtest.h> // for FRIEND_TEST
#include "include/filter_interpreter.h"
#include "include/finger_metrics.h"
#include "include/gestures.h"
#include "include/prop_registry.h"
#include "include/tracer.h"
#ifndef GESTURES_FLING_STOP_FILTER_INTERPRETER_H_
#define GESTURES_FLING_STOP_FILTER_INTERPRETER_H_
namespace gestures {
// This interpreter generates the fling-stop messages when new fingers
// arrive on the pad.
class FlingStopFilterInterpreter : public FilterInterpreter {
FRIEND_TEST(FlingStopFilterInterpreterTest, SimpleTest);
public:
// Takes ownership of |next|:
FlingStopFilterInterpreter(PropRegistry* prop_reg,
Interpreter* next,
Tracer* tracer,
GestureInterpreterDeviceClass devclass);
virtual ~FlingStopFilterInterpreter() {}
protected:
virtual void SyncInterpretImpl(HardwareState& hwstate, stime_t* timeout);
virtual void HandleTimerImpl(stime_t now, stime_t* timeout);
virtual void ConsumeGesture(const Gesture& gesture);
private:
// May override an outgoing gesture with a fling stop gesture.
bool NeedsExtraTime(const HardwareState& hwstate) const;
bool FlingStopNeeded(const Gesture& gesture) const;
void UpdateFlingStopDeadline(const HardwareState& hwstate);
// Has the deadline has already been extended once
bool already_extended_;
// Which tracking id's were on the pad at the last fling
std::set<short> fingers_present_for_last_fling_;
// tracking id's of the last hardware state
std::set<short> fingers_of_last_hwstate_;
// touch_cnt from previously input HardwareState.
short prev_touch_cnt_;
// timestamp from previous input HardwareState.
stime_t prev_timestamp_;
// Most recent gesture type consumed and produced.
GestureType prev_gesture_type_;
// Whether a fling stop has been sent since the last gesture.
bool fling_stop_already_sent_;
// When we should send fling-stop, or NO_DEADLINE if not set.
stime_t fling_stop_deadline_;
// Device class (e.g. touchpad, mouse).
GestureInterpreterDeviceClass devclass_;
// How long to wait when new fingers arrive (and possibly scroll), before
// halting fling
DoubleProperty fling_stop_timeout_;
// How much extra time to add if it looks likely to be the start of a scroll
DoubleProperty fling_stop_extra_delay_;
};
} // namespace gestures
#endif // GESTURES_FLING_STOP_FILTER_INTERPRETER_H_
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