Add ImeMenuTray element.

ash/system/chromeos/ime_menu/ime_menu_tray.cc

+// Copyright 2016 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 "ash/system/chromeos/ime_menu/ime_menu_tray.h"
+
+#include "ash/aura/wm_window_aura.h"
+#include "ash/common/system/tray/system_tray_notifier.h"
+#include "ash/common/system/tray/tray_constants.h"
+#include "ash/common/system/tray/tray_utils.h"
+#include "ash/common/wm/window_state.h"
+#include "ash/common/wm_shell.h"
+#include "ash/shell.h"
+#include "ash/system/status_area_widget.h"
+#include "ash/wm/window_state_aura.h"
+#include "ash/wm/window_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "grit/ash_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/events/event.h"
+#include "ui/views/controls/label.h"
+
+namespace ash {
+
+namespace {
+
+class ImeMenuLabel : public views::Label {
+ public:
+  ImeMenuLabel() : views::Label(base::string16()) {}
+
+  // views:Label:
+  gfx::Size GetPreferredSize() const override {
+    return gfx::Size(kNotificationIconWidth, kNotificationIconWidth);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ImeMenuLabel);
+};
+
+}  // namespace
+
+ImeMenuTray::ImeMenuTray(StatusAreaWidget* status_area_widget)
+    : TrayBackgroundView(status_area_widget->wm_shelf()),
+      label_(nullptr),
+      window_state_(nullptr) {
+  label_ = new ImeMenuLabel();
+  SetupLabelForTray(label_);
+  tray_container()->AddChildView(label_);
+  SetContentsBackground();
+  // The Shell may not exist in some unit tests.
+  if (WmShell::HasInstance())
+    WmShell::Get()->system_tray_notifier()->AddIMEObserver(this);
+}
+
+ImeMenuTray::~ImeMenuTray() {
+  // The Shell may not exist in some unit tests.
+  if (WmShell::HasInstance())
+    WmShell::Get()->system_tray_notifier()->RemoveIMEObserver(this);
+  if (window_state_)
+    window_state_->RemoveObserver(this);
+}
+
+void ImeMenuTray::SetWindowState(wm::WindowState* window_state) {
+  if (window_state_ == window_state)
+    return;
+
+  // The tray could be set with different window state as there are more than
+  // one IME extensions to create the IME menu window.
+  if (window_state_)
+    window_state_->RemoveObserver(this);
+
+  if (window_state) {
+    window_state_ = window_state;
+    window_state_->AddObserver(this);
+  }
+}
+
+void ImeMenuTray::SetShelfAlignment(ShelfAlignment alignment) {
+  TrayBackgroundView::SetShelfAlignment(alignment);
+  tray_container()->SetBorder(views::Border::NullBorder());
+  SetLabelBorder();
+}
+
+base::string16 ImeMenuTray::GetAccessibleNameForTray() {
+  return l10n_util::GetStringUTF16(IDS_ASH_IME_MENU_ACCESSIBLE_NAME);
+}
+
+void ImeMenuTray::HideBubbleWithView(const views::TrayBubbleView* bubble_view) {
+}
+
+void ImeMenuTray::ClickedOutsideBubble() {}
+
+bool ImeMenuTray::PerformAction(const ui::Event& event) {
+  if (window_state_) {
+    if (window_state_->IsActive())
+      window_state_->Deactivate();
+    else
+      window_state_->Activate();
+    SetDrawBackgroundAsActive(window_state_->IsActive());
+  }
+  return true;
+}
+
+void ImeMenuTray::OnIMERefresh() {
+  SystemTrayDelegate* delegate = WmShell::Get()->system_tray_delegate();
+  delegate->GetCurrentIME(&current_ime_);
+  UpdateTray();
+}
+
+void ImeMenuTray::OnIMEMenuActivationChanged(bool is_activated) {
+  SetVisible(is_activated);
+  if (!is_activated && window_state_) {
+    window_state_->RemoveObserver(this);
+    window_state_ = nullptr;
+  }
+}
+
+void ImeMenuTray::OnPostWindowStateTypeChange(wm::WindowState* window_state,
+                                              wm::WindowStateType old_type) {
+  DCHECK_EQ(window_state_, window_state);
+  UpdateTray();
+}
+
+void ImeMenuTray::UpdateTray() {
+  if (!window_state_)
+    return;
+  // Sets the background color based on the window state.
+  SetDrawBackgroundAsActive(window_state_->IsActive());
+  // Updates the tray label based on the current input method.
+  if (current_ime_.third_party)
+    label_->SetText(current_ime_.short_name + base::UTF8ToUTF16("*"));
+  else
+    label_->SetText(current_ime_.short_name);
+  SetLabelBorder();
+}
+
+void ImeMenuTray::SetLabelBorder() {
+  int label_width = label_->width();
+  int label_height = label_->height();
+  if ((label_width != 0 && label_width < kNotificationIconWidth) ||
+      (label_height != 0 && label_height < kNotificationIconWidth)) {
+    int left_padding = (kNotificationIconWidth - label_width) / 2;
+    int top_padding = (kNotificationIconWidth - label_height) / 2;
+    int bottom_padding = kNotificationIconWidth - label_height - top_padding;
+    int right_padding = kNotificationIconWidth - label_width - left_padding;
+    label_->SetBorder(views::Border::CreateEmptyBorder(
+        top_padding, left_padding, bottom_padding, right_padding));
+  }
+}
+
+}  // namespace ash