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// Copyright 2013 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 "ash/keyboard_uma_event_filter.h"
#include "base/metrics/histogram.h"
#include "ui/events/event.h"
namespace {
// This threshold is used to drop keystrokes that are more than some time apart.
// These keystrokes are dropped to avoid recording outliers, as well as pauses
// between actual segments of typing.
const int kKeystrokeThresholdInSeconds = 5;
}
namespace ash {
namespace internal {
KeyboardUMAEventFilter::KeyboardUMAEventFilter() {}
KeyboardUMAEventFilter::~KeyboardUMAEventFilter() {}
void KeyboardUMAEventFilter::OnKeyEvent(ui::KeyEvent* event) {
// This is a rough approximation, so assume that each key release is the
// result of a typed key.
if (event->type() != ui::ET_KEY_RELEASED)
return;
// Reset the timer on non-character keystrokes.
if (!isprint(event->GetCharacter())) {
last_keystroke_time_ = base::TimeDelta();
return;
}
if (last_keystroke_time_.ToInternalValue() == 0) {
last_keystroke_time_ = event->time_stamp();
return;
}
base::TimeDelta delta = event->time_stamp() - last_keystroke_time_;
if (delta < base::TimeDelta::FromSeconds(kKeystrokeThresholdInSeconds))
UMA_HISTOGRAM_TIMES("Keyboard.KeystrokeDeltas", delta);
last_keystroke_time_ = event->time_stamp();
}
} // namespace internal
} // namespace ash
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