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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/input/tap_suppression_controller.h"
#include "base/notreached.h"
#include "base/trace_event/trace_event.h"
namespace input {
TapSuppressionController::Config::Config()
: enabled(false), max_cancel_to_down_time(base::Milliseconds(180)) {}
TapSuppressionController::TapSuppressionController(const Config& config)
: state_(config.enabled ? NOTHING : DISABLED),
max_cancel_to_down_time_(config.max_cancel_to_down_time) {}
TapSuppressionController::~TapSuppressionController() = default;
void TapSuppressionController::GestureFlingCancelStoppedFling() {
base::TimeTicks event_time = Now();
switch (state_) {
case DISABLED:
case SUPPRESSING_TAPS:
break;
case NOTHING:
fling_cancel_time_ = event_time;
state_ = LAST_CANCEL_STOPPED_FLING;
break;
case LAST_CANCEL_STOPPED_FLING:
break;
}
}
bool TapSuppressionController::ShouldSuppressTapDown() {
base::TimeTicks event_time = Now();
switch (state_) {
case DISABLED:
case NOTHING:
return false;
case LAST_CANCEL_STOPPED_FLING:
if ((event_time - fling_cancel_time_) < max_cancel_to_down_time_) {
state_ = SUPPRESSING_TAPS;
return true;
} else {
state_ = NOTHING;
return false;
}
// Stop suppressing tap end events.
case SUPPRESSING_TAPS:
state_ = NOTHING;
return false;
}
NOTREACHED() << "Invalid state";
}
bool TapSuppressionController::ShouldSuppressTapEnd() {
switch (state_) {
case DISABLED:
case NOTHING:
return false;
case LAST_CANCEL_STOPPED_FLING:
return true;
case SUPPRESSING_TAPS:
return true;
}
return false;
}
base::TimeTicks TapSuppressionController::Now() {
return base::TimeTicks::Now();
}
} // namespace input
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