// Copyright (c) 2011 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/chromeos/status/input_method_menu_button.h"

#include <string>

#include "base/utf_string_conversions.h"
#include "chrome/browser/chromeos/cros/cros_library.h"
#include "chrome/browser/chromeos/input_method/input_method_util.h"
#include "chrome/browser/chromeos/status/status_area_host.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_window.h"
#include "views/window/window.h"

namespace {

// Returns PrefService object associated with |host|. Returns NULL if we are NOT
// within a browser.
PrefService* GetPrefService(chromeos::StatusAreaHost* host) {
  if (host->GetProfile()) {
    return host->GetProfile()->GetPrefs();
  }
  return NULL;
}

// A class which implements interfaces of chromeos::InputMethodMenu. This class
// is just for avoiding multiple inheritance.
class MenuImpl : public chromeos::InputMethodMenu {
 public:
  MenuImpl(chromeos::InputMethodMenuButton* button,
           PrefService* pref_service,
           chromeos::StatusAreaHost::ScreenMode screen_mode)
      : InputMethodMenu(pref_service, screen_mode, false), button_(button) {}

 private:
  // InputMethodMenu implementation.
  virtual void UpdateUI(const std::string& input_method_id,
                        const std::wstring& name,
                        const std::wstring& tooltip,
                        size_t num_active_input_methods) {
    button_->UpdateUI(input_method_id, name, tooltip, num_active_input_methods);
  }
  virtual bool ShouldSupportConfigUI() {
    return button_->ShouldSupportConfigUI();
  }
  virtual void OpenConfigUI() {
    button_->OpenConfigUI();
  }
  // The UI (views button) to which this class delegates all requests.
  chromeos::InputMethodMenuButton* button_;

  DISALLOW_COPY_AND_ASSIGN(MenuImpl);
};

}  // namespace

namespace chromeos {

////////////////////////////////////////////////////////////////////////////////
// InputMethodMenuButton

InputMethodMenuButton::InputMethodMenuButton(StatusAreaHost* host)
    : StatusAreaButton(host, this),
      menu_(new MenuImpl(this, GetPrefService(host), host->GetScreenMode())) {
  UpdateUIFromCurrentInputMethod();
}

////////////////////////////////////////////////////////////////////////////////
// views::View implementation:

gfx::Size InputMethodMenuButton::GetPreferredSize() {
  // If not enabled, then hide this button.
  if (!IsEnabled()) {
    return gfx::Size(0, 0);
  }
  return StatusAreaButton::GetPreferredSize();
}

void InputMethodMenuButton::OnLocaleChanged() {
  input_method::OnLocaleChanged();
  UpdateUIFromCurrentInputMethod();
  Layout();
  SchedulePaint();
}

////////////////////////////////////////////////////////////////////////////////
// views::ViewMenuDelegate implementation:

void InputMethodMenuButton::RunMenu(views::View* unused_source,
                                    const gfx::Point& pt) {
  menu_->RunMenu(unused_source, pt);
}

bool InputMethodMenuButton::WindowIsActive() {
  Browser* active_browser = BrowserList::GetLastActive();
  if (!active_browser) {
    // Can't get an active browser. Just return true, which is safer.
    return true;
  }
  BrowserWindow* active_window = active_browser->window();
  const views::Window* current_window = GetWindow();
  if (!active_window || !current_window) {
    // Can't get an active or current window. Just return true as well.
    return true;
  }
  return active_window->GetNativeHandle() == current_window->GetNativeWindow();
}

void InputMethodMenuButton::UpdateUI(const std::string& input_method_id,
                                     const std::wstring& name,
                                     const std::wstring& tooltip,
                                     size_t num_active_input_methods) {
  // Hide the button only if there is only one input method, and the input
  // method is a XKB keyboard layout. We don't hide the button for other
  // types of input methods as these might have intra input method modes,
  // like Hiragana and Katakana modes in Japanese input methods.
  if (num_active_input_methods == 1 &&
      input_method::IsKeyboardLayout(input_method_id) &&
      host_->GetScreenMode() == StatusAreaHost::kBrowserMode) {
    // As the disabled color is set to invisible, disabling makes the
    // button disappear.
    SetEnabled(false);
    SetTooltipText(L"");  // remove tooltip
  } else {
    SetEnabled(true);
    SetTooltipText(tooltip);
  }
  SetText(name);

  if (WindowIsActive()) {
    // We don't call these functions if the |current_window| is not active since
    // the calls are relatively expensive (crosbug.com/9206). Please note that
    // PrepareMenu() is necessary for fixing crosbug.com/7522 when the window
    // is active.
    menu_->PrepareMenu();
    SchedulePaint();
  }

  // TODO(yusukes): For a window which isn't on top, probably it's better to
  // update the texts when the window gets activated because SetTooltipText()
  // and SetText() are also expensive.
}

void InputMethodMenuButton::OpenConfigUI() {
  host_->OpenButtonOptions(this);  // ask browser to open the WebUI page.
}

bool InputMethodMenuButton::ShouldSupportConfigUI() {
  return host_->ShouldOpenButtonOptions(this);
}

void InputMethodMenuButton::UpdateUIFromCurrentInputMethod() {
  chromeos::InputMethodLibrary* input_method_library =
      chromeos::CrosLibrary::Get()->GetInputMethodLibrary();
  const InputMethodDescriptor& input_method =
      input_method_library->current_input_method();
  const std::wstring name = InputMethodMenu::GetTextForIndicator(input_method);
  const std::wstring tooltip = InputMethodMenu::GetTextForMenu(input_method);
  const size_t num_active_input_methods =
      input_method_library->GetNumActiveInputMethods();
  UpdateUI(input_method.id, name, tooltip, num_active_input_methods);
}

}  // namespace chromeos
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169