UMA stats for stylus usage

chrome/browser/ui/ash/metrics/stylus_metrics_recorder.cc

Index: chrome/browser/ui/ash/metrics/stylus_metrics_recorder.cc
diff --git a/chrome/browser/ui/ash/metrics/stylus_metrics_recorder.cc b/chrome/browser/ui/ash/metrics/stylus_metrics_recorder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9202bc94ee3114e284dd8f0fc89cb0b7ad0fec10
--- /dev/null
+++ b/chrome/browser/ui/ash/metrics/stylus_metrics_recorder.cc
@@ -0,0 +1,135 @@
+// 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 "chrome/browser/ui/ash/metrics/stylus_metrics_recorder.h"
+
+#include "ash/common/shell_window_ids.h"
+#include "ash/common/wm/container_finder.h"
+#include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
+#include "ash/common/wm_lookup.h"
+#include "ash/common/wm_shell.h"
+#include "ash/common/wm_window.h"
+#include "base/metrics/histogram_macros.h"
+#include "chrome/browser/apps/app_window_registry_util.h"
+#include "chrome/browser/chromeos/note_taking_app_utils.h"
+#include "components/exo/shell_surface.h"
+#include "extensions/browser/app_window/app_window.h"
+#include "ui/events/event_constants.h"
+#include "ui/views/widget/widget.h"
+
+namespace chromeos {
+
+StylusMetricsRecorder::StylusMetricsRecorder() {
+  ash::WmShell::Get()->AddPointerWatcher(
+      this, views::PointerWatcherEventTypes::BASIC);
+}
+
+StylusMetricsRecorder::~StylusMetricsRecorder() {
+  ash::WmShell::Get()->RemovePointerWatcher(this);
+}
+
+void StylusMetricsRecorder::OnPointerEventObserved(
+    const ui::PointerEvent& event,
+    const gfx::Point& location_in_screen,
+    views::Widget* target) {
+  if (event.type() != ui::ET_POINTER_DOWN)
+    return;
+  RecordUMA(event.pointer_details().pointer_type, target);
+}
+
+void StylusMetricsRecorder::RecordUMA(ui::EventPointerType type,
+                                      views::Widget* target) {
+  DownEventFormFactor form_factor = DOWN_EVENT_FORMFACTOR_CLAMSHELL;
+  if (ash::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);
+
+  DownEventDestination dest = GetDownEventDestination(target);
+  UMA_HISTOGRAM_ENUMERATION("Event.DownEventCount.PerDestination", dest,
+                            DOWN_EVENT_DESTINATION_COUNT);
+}
+
+bool StylusMetricsRecorder::IsEventOnShelf(views::Widget* target) {
+  if (!target) {

[sky, 2016/09/13 00:03:26]

In general we don't use {} around single line conditionals.

[xiaoyinh(OOO Sep 11-29), 2016/09/16 18:41:16]

Done.

+    return false;
+  }
+
+  ash::WmWindow* window = ash::WmLookup::Get()->GetWindowForWidget(target);
+  int container_id = ash::wm::GetContainerForWindow(window)->GetShellWindowId();

[sky, 2016/09/13 00:03:26]

Make sure you null check GetContainerForWindow and deal.

[xiaoyinh(OOO Sep 11-29), 2016/09/16 18:41:16]

Done.

+
+  // Events on the shelf.
+  if (container_id == ash::kShellWindowId_ShelfContainer)
+    return true;
+  // Events on the status area.
+  if (container_id == ash::kShellWindowId_StatusContainer)
+    return true;
+  // Events on the right click menus.
+  if (container_id == ash::kShellWindowId_MenuContainer)

[sky, 2016/09/13 00:03:26]

This hits *all* menus. I don't think you want that.

[xiaoyinh(OOO Sep 11-29), 2016/09/16 18:41:16]

Deleted. Thanks.

+    return true;
+  // Events on the settings trays.
+  if (container_id == ash::kShellWindowId_SettingBubbleContainer)
+    return true;
+  // Events on the overflow bubbles over the shelf.
+  if (container_id == ash::kShellWindowId_ShelfBubbleContainer)
+    return true;
+
+  return false;
+}
+
+DownEventDestination StylusMetricsRecorder::GetDownEventDestination(
+    views::Widget* target) {
+  DownEventDestination dest = DOWN_EVENT_DESTINATION_OTHERS;
+  if (!target)
+    return dest;
+
+  if (IsEventOnShelf(target))
+    return DOWN_EVENT_DESTINATION_SYSTEM_UI;
+
+  aura::Window* window = target->GetNativeWindow();
+
+  if (exo::ShellSurface::GetMainSurface(window))
+    return DOWN_EVENT_DESTINATION_ARC_APP;
+
+  if (window->GetProperty(aura::client::kStylusWindowTypeBucket) ==

[xiyuan, 2016/09/12 20:15:47]

nit: save the result of
window->GetProperty(aura::client::kStylusWindowTypeBucket) in a local var since
it is used more than once.

[xiaoyinh(OOO Sep 11-29), 2016/09/16 18:41:16]

Done.

+      StylusWindowType::WINDOW_TYPE_BROWSER_WINDOW)
+    return DOWN_EVENT_DESTINATION_WEBSITE;
+
+  if (window->GetProperty(aura::client::kStylusWindowTypeBucket) ==
+      StylusWindowType::WINDOW_TYPE_APP) {
+    extensions::AppWindow* app_window =
+        AppWindowRegistryUtil::GetAppWindowForNativeWindowAnyProfile(window);
+    if (app_window && chromeos::IsCurrentAppNoteTakingApp(app_window))
+      return DOWN_EVENT_DESTINATION_NOTE_TAKING_APP;
+  }
+
+  return dest;
+}
+
+}  // namespace chromeos