Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/ozone/device/device_manager_manual.cc

+// Copyright 2014 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 "ui/events/ozone/device/device_manager_manual.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/files/file_enumerator.h"
+#include "base/location.h"
+#include "base/threading/worker_pool.h"
+#include "ui/events/ozone/device/device_event.h"
+#include "ui/events/ozone/device/device_event_observer.h"
+
+namespace ui {
+
+namespace {
+
+void ScanDevicesOnWorkerThread(std::vector<base::FilePath>* result) {
+  base::FileEnumerator file_enum(base::FilePath("/dev/input"),
+                                 false,
+                                 base::FileEnumerator::FILES,
+                                 "event*[0-9]");
+  for (base::FilePath path = file_enum.Next(); !path.empty();
+       path = file_enum.Next()) {
+    result->push_back(path);
+  }
+}
+}
+
+DeviceManagerManual::DeviceManagerManual()
+    : have_scanned_devices_(false), weak_ptr_factory_(this) {
+}
+
+DeviceManagerManual::~DeviceManagerManual() {
+}
+
+void DeviceManagerManual::ScanDevices(DeviceEventObserver* observer) {
+  if (have_scanned_devices_) {
+    std::vector<base::FilePath>::const_iterator it = devices_.begin();
+    for (; it != devices_.end(); ++it) {
+      DeviceEvent event(DeviceEvent::INPUT, DeviceEvent::ADD, *it);
+      observer->OnDeviceEvent(event);
+    }
+  } else {
+    std::vector<base::FilePath>* result = new std::vector<base::FilePath>();
+    base::WorkerPool::PostTaskAndReply(
+        FROM_HERE, base::Bind(&ScanDevicesOnWorkerThread, result),
+        base::Bind(&DeviceManagerManual::OnDevicesScanned,
+                   weak_ptr_factory_.GetWeakPtr(), base::Owned(result)),
+        false /* task_is_slow */);
+    have_scanned_devices_ = true;
+  }
+}
+
+void DeviceManagerManual::AddObserver(DeviceEventObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void DeviceManagerManual::RemoveObserver(DeviceEventObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void DeviceManagerManual::OnDevicesScanned(
+    std::vector<base::FilePath>* result) {
+  std::vector<base::FilePath>::const_iterator it = result->begin();
+  for (; it != result->end(); ++it) {
+    devices_.push_back(*it);
+    DeviceEvent event(DeviceEvent::INPUT, DeviceEvent::ADD, *it);
+    FOR_EACH_OBSERVER(DeviceEventObserver, observers_, OnDeviceEvent(event));
+  }
+}
+
+}  // namespace ui