UMA stats for stylus usage

ash/wm/stylus_metrics_recorder.cc

-// Copyright 2016 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/wm/stylus_metrics_recorder.h"
-
-#include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
-#include "ash/common/wm_shell.h"
-#include "ash/shell.h"
-#include "base/metrics/histogram.h"
-#include "ui/events/event.h"
-#include "ui/events/event_constants.h"
-#include "ui/events/event_utils.h"
-
-namespace ash {
-
-// Form factor of the down event. This enum is used to back an UMA histogram
-// and should be treated as append-only.
-enum DownEventFormFactor {
-  DOWN_EVENT_FORMFACTOR_CLAMSHELL = 0,
-  DOWN_EVENT_FORMFACTOR_TOUCHVIEW,
-  DOWN_EVENT_FORMFACTOR_COUNT
-};
-
-// Input type of the down event. This enum is used to back an UMA histogram
-// and should be treated as append-only.
-enum DownEventSource {
-  DOWN_EVENT_SOURCE_UNKNOWN = 0,
-  DOWN_EVENT_SOURCE_MOUSE,
-  DOWN_EVENT_SOURCE_STYLUS,
-  DOWN_EVENT_SOURCE_TOUCH,
-  DOWN_EVENT_SOURCE_COUNT
-};
-
-StylusMetricsRecorder::StylusMetricsRecorder() {}
-
-StylusMetricsRecorder::~StylusMetricsRecorder() {}
-
-void StylusMetricsRecorder::OnMouseEvent(ui::MouseEvent* event) {
-  if (event->type() != ui::ET_MOUSE_PRESSED)
-    return;
-  RecordUMA(event->pointer_details().pointer_type);
-}
-
-void StylusMetricsRecorder::OnTouchEvent(ui::TouchEvent* event) {
-  if (event->type() != ui::ET_TOUCH_PRESSED)
-    return;
-  RecordUMA(event->pointer_details().pointer_type);
-}
-
-void StylusMetricsRecorder::RecordUMA(ui::EventPointerType type) {
-  DownEventFormFactor form_factor = DOWN_EVENT_FORMFACTOR_CLAMSHELL;
-  if (WmShell::Get()
-          ->maximize_mode_controller()
-          ->IsMaximizeModeWindowManagerEnabled()) {
-    form_factor = DOWN_EVENT_FORMFACTOR_TOUCHVIEW;
-  }
-  UMA_HISTOGRAM_ENUMERATION("Event.DownEventCount.PerFormFactor", form_factor,
-                            DOWN_EVENT_FORMFACTOR_COUNT);
-
-  DownEventSource input_type = DOWN_EVENT_SOURCE_UNKNOWN;
-  switch (type) {
-    case ui::EventPointerType::POINTER_TYPE_UNKNOWN:
-      input_type = DOWN_EVENT_SOURCE_UNKNOWN;
-      break;
-    case ui::EventPointerType::POINTER_TYPE_MOUSE:
-      input_type = DOWN_EVENT_SOURCE_MOUSE;
-      break;
-    case ui::EventPointerType::POINTER_TYPE_PEN:
-      input_type = DOWN_EVENT_SOURCE_STYLUS;
-      break;
-    case ui::EventPointerType::POINTER_TYPE_TOUCH:
-      input_type = DOWN_EVENT_SOURCE_TOUCH;
-      break;
-    case ui::EventPointerType::POINTER_TYPE_ERASER:
-      input_type = DOWN_EVENT_SOURCE_STYLUS;
-      break;
-  }
-
-  UMA_HISTOGRAM_ENUMERATION("Event.DownEventCount.PerInput", input_type,
-                            DOWN_EVENT_SOURCE_COUNT);
-}
-
-}  // namespace ash