[WIP] Fire a theme changed notification when device scan completes

ui/base/material_design/material_design_controller.cc

 // Copyright 2015 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 <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/ui_base_switches.h"
 
 #if defined(OS_CHROMEOS)
 #include "ui/base/touch/touch_device.h"
 #include "ui/events/devices/device_data_manager.h"
 
 #if defined(USE_OZONE)
 #include <fcntl.h>
 
 #include "base/files/file_enumerator.h"
 #include "ui/events/ozone/evdev/event_device_info.h"
 #endif  // defined(USE_OZONE)
 
 #endif  // defined(OS_CHROMEOS)
 
 namespace ui {
 
 bool MaterialDesignController::is_mode_initialized_ = false;
 
+bool MaterialDesignController::mode_initialized_by_switch_ = false;
+
 MaterialDesignController::Mode MaterialDesignController::mode_ =
     MaterialDesignController::Mode::NON_MATERIAL;
 
 // static
 void MaterialDesignController::Initialize() {
   TRACE_EVENT0("startup", "MaterialDesignController::InitializeMode");
   CHECK(!is_mode_initialized_);
 #if !defined(ENABLE_TOPCHROME_MD)
   SetMode(Mode::NON_MATERIAL);
 #else
   const std::string switch_value =
       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kTopChromeMD);
 
+  mode_initialized_by_switch_ = true;
+
   if (switch_value == switches::kTopChromeMDMaterial) {
     SetMode(Mode::MATERIAL_NORMAL);
   } else if (switch_value == switches::kTopChromeMDMaterialHybrid) {
     SetMode(Mode::MATERIAL_HYBRID);
   } else if (switch_value == switches::kTopChromeMDNonMaterial) {
     SetMode(Mode::NON_MATERIAL);
   } else {
     if (!switch_value.empty()) {
       LOG(ERROR) << "Invalid value='" << switch_value
                  << "' for command line switch '" << switches::kTopChromeMD
                  << "'.";
     }
+    mode_initialized_by_switch_ = false;
     SetMode(DefaultMode());
   }
 #endif  // !defined(ENABLE_TOPCHROME_MD)
 }
 
 // static
+bool MaterialDesignController::DeviceListsComplete() {
+#if defined(OS_CHROMEOS)
+  DCHECK(DeviceDataManager::HasInstance());
+  DCHECK(DeviceDataManager::GetInstance()->device_lists_complete());
+
+  if (!is_mode_initialized_ || mode_initialized_by_switch_)
+    return false;
+
+  if (GetTouchScreensAvailability() == TouchScreensAvailability::ENABLED &&
+      GetMode() == Mode::MATERIAL_NORMAL) {
+    mode_ = Mode::MATERIAL_HYBRID;
+    return true;
+  }
+#endif  // defined(OS_CHROMEOS)
+  return false;
+}
+
 MaterialDesignController::Mode MaterialDesignController::GetMode() {
   CHECK(is_mode_initialized_);
   return mode_;
 }
 
 // static
 bool MaterialDesignController::IsModeMaterial() {
   return GetMode() == Mode::MATERIAL_NORMAL ||
          GetMode() == Mode::MATERIAL_HYBRID;
 }
 
 // static
 MaterialDesignController::Mode MaterialDesignController::DefaultMode() {
 #if defined(OS_CHROMEOS)
   if (DeviceDataManager::HasInstance() &&
       DeviceDataManager::GetInstance()->device_lists_complete()) {
     return GetTouchScreensAvailability() == TouchScreensAvailability::ENABLED ?
         Mode::MATERIAL_HYBRID : Mode::MATERIAL_NORMAL;
   }
-
-#if defined(USE_OZONE)
-  base::FileEnumerator file_enum(
-      base::FilePath(FILE_PATH_LITERAL("/dev/input")), false,
-      base::FileEnumerator::FILES, FILE_PATH_LITERAL("event*[0-9]"));
-  for (base::FilePath path = file_enum.Next(); !path.empty();
-       path = file_enum.Next()) {
-    EventDeviceInfo devinfo;
-    int fd = open(path.value().c_str(), O_RDWR | O_NONBLOCK | O_CLOEXEC);
-    if (fd >= 0) {
-      if (devinfo.Initialize(fd, path) && devinfo.HasTouchscreen()) {
-        close(fd);
-        return Mode::MATERIAL_HYBRID;
-      }
-      close(fd);
-    }
-  }
-#endif  // defined(USE_OZONE)
   return Mode::MATERIAL_NORMAL;
 #elif defined(OS_LINUX)
   return Mode::MATERIAL_NORMAL;
 #else
   return Mode::NON_MATERIAL;
 #endif  // defined(OS_CHROMEOS)
 }
 
 // static
 void MaterialDesignController::Uninitialize() {
   is_mode_initialized_ = false;
 }
 
 // static
 void MaterialDesignController::SetMode(MaterialDesignController::Mode mode) {
   mode_ = mode;
   is_mode_initialized_ = true;
 }
 
 }  // namespace ui