chrome/browser/chromeos/input_method/mode_indicator_controller.cc

// Copyright 2013 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 "base/command_line.h"
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/chromeos/input_method/input_method_util.h"
#include "chrome/browser/chromeos/input_method/mode_indicator_controller.h"
#include "chrome/browser/chromeos/input_method/mode_indicator_widget.h"
#include "chromeos/chromeos_switches.h"

namespace chromeos {
namespace input_method {

namespace {
// Show mode indicator with the current ime's short name.
void ShowModeIndicator(InputMethodManager* manager,
                       ModeIndicatorWidget* mi_widget) {
  // Need the flag, --enable-ime-mode-indicator at this moment.
  // TODO(komatsu): When this is enabled by defalut, delete command_line.h
  // and chromeos_switches.h from the header files.
  if (!CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableIMEModeIndicator))
    return;

  DCHECK(manager);
  DCHECK(mi_widget);

  // Get the short name of the changed input method (e.g. US, JA, etc.)
  const InputMethodDescriptor descriptor = manager->GetCurrentInputMethod();
  const std::string short_name = UTF16ToUTF8(
      manager->GetInputMethodUtil()->GetInputMethodShortName(descriptor));
  mi_widget->SetLabelTextUtf8(short_name);

  // Show the widget and hide it after 750msec.
  mi_widget->Show();
  const int kDelayMSec = 750;
  mi_widget->DelayHide(kDelayMSec);
}
}  // namespace

ModeIndicatorController::ModeIndicatorController(
    ModeIndicatorWidget* mi_widget) {
  mi_widget_.reset(mi_widget);

  InputMethodManager* imm = InputMethodManager::Get();
  DCHECK(imm);
  imm->AddObserver(this);
}

ModeIndicatorController::~ModeIndicatorController() {
  InputMethodManager* imm = InputMethodManager::Get();
  DCHECK(imm);
  imm->RemoveObserver(this);
}

void ModeIndicatorController::SetCursorLocation(
    const gfx::Rect& cursor_location) {
  mi_widget_->SetCursorLocation(cursor_location);
}

void ModeIndicatorController::InputMethodChanged(InputMethodManager* manager,
                                                 bool show_message) {
  if (!show_message)
    return;

  ShowModeIndicator(manager, mi_widget_.get());
}

void ModeIndicatorController::InputMethodPropertyChanged(
    InputMethodManager* manager) {
  // Do nothing.
}

}  // namespace input_method
}  // namespace chromeos