ui/events/ozone/layout/keyboard_layout_engine_manager.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/events/ozone/layout/keyboard_layout_engine_manager.h"
   6
   7 #include "base/logging.h"
   8 #include "ui/events/ozone/layout/stub/stub_keyboard_layout_engine.h"
   9
  10 namespace ui {
  11
  12 // static
  13 KeyboardLayoutEngineManager* KeyboardLayoutEngineManager::instance_ = nullptr;
  14
  15 KeyboardLayoutEngineManager::KeyboardLayoutEngineManager(
  16     KeyboardLayoutEngine* engine)
  17     : keyboard_layout_engine_(engine) {
  18   CHECK(!instance_) << "Only one keyboard layout manager can be created.";
  19   instance_ = this;
  20 }
  21
  22 KeyboardLayoutEngineManager::~KeyboardLayoutEngineManager() {
  23   CHECK_EQ(this, instance_);
  24   instance_ = NULL;
  25 }
  26
  27 void KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(
  28     scoped_ptr<KeyboardLayoutEngine> engine) {
  29   if (instance_)
  30     instance_->keyboard_layout_engine_.reset(engine.release());
  31   else
  32     new KeyboardLayoutEngineManager(engine.release());
  33 }
  34
  35 KeyboardLayoutEngine* KeyboardLayoutEngineManager::GetKeyboardLayoutEngine() {
  36   // TODO(kpschoedel): crbug.com/430194 This lazy initialization is a
  37   // workaround for not yet initializing KeyboardLayoutEngineManager
  38   // expliclity in all tests that need it.
  39   if (!instance_)
  40     new KeyboardLayoutEngineManager(new StubKeyboardLayoutEngine());
  41   return instance_->keyboard_layout_engine_.get();
  42 }
  43
  44 }  // namespace ui