[MacViews] Implemented text context menu

ui/base/cocoa/text_services_context_menu.h

+// 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.
+
+#ifndef UI_BASE_COCOA_TEXT_SERVICES_CONTEXT_MENU_H_
+#define UI_BASE_COCOA_TEXT_SERVICES_CONTEXT_MENU_H_
+
+#include "base/i18n/rtl.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "ui/base/models/simple_menu_model.h"
+#include "ui/base/ui_base_export.h"
+
+namespace ui {
+
+// This class is used to append and handle text service items to the context
+// menu. These items are comprised of the Speech, Look Up, and BiDi items.
+class UI_BASE_EXPORT TextServicesContextMenu
+    : public SimpleMenuModel::Delegate {
+ public:
+  class UI_BASE_EXPORT Delegate {
+   public:
+    // Returns the selected text.
+    virtual base::string16 GetSelectedText() const = 0;
+
+    // Handles the "Start Speaking" command. The delegate is expected to
+    // provide text and call SpeakText().
+    virtual void OnSpeakRequested() = 0;
+
+    // Returns true if the "Look Up" item is available on the menu.
+    virtual bool IsLookUpAvailable() const = 0;
+
+    // Handles the "Look Up" command.
+    virtual void LookUpInDictionary() = 0;
+
+    // Returns true if |direction| should be enabled in the BiDi submenu.
+    virtual bool IsTextDirectionEnabled(
+        base::i18n::TextDirection direction) const = 0;
+
+    // Returns true if |direction| should be checked in the BiDi submenu.
+    virtual bool IsTextDirectionChecked(
+        base::i18n::TextDirection direction) const = 0;
+
+    // Updates the text direction to |direction|.
+    virtual void UpdateTextDirection(base::i18n::TextDirection direction) = 0;
+  };
+
+  explicit TextServicesContextMenu(Delegate* delegate);
+
+  // Methods for speaking.
+  static void SpeakText(const base::string16& text);
+  static void StopSpeaking();
+  static bool IsSpeaking();
+
+  // Appends items to the context menu.
+  void AppendToContextMenu(SimpleMenuModel* model);
+
+  // Returns true if the command_id is supported by the text services menu.
+  bool IsTextServicesCommandId(int command_id) const;
+
+  // SimpleMenuModel::Delegate:
+  void ExecuteCommand(int command_id, int event_flags) override;
+  bool IsCommandIdChecked(int command_id) const override;
+  bool IsCommandIdEnabled(int command_id) const override;
+
+ private:
+  // Model for the "Speech" submenu.
+  ui::SimpleMenuModel speech_submenu_model_;
+
+  // Model for the BiDi input submenu.
+  ui::SimpleMenuModel bidi_submenu_model_;
+
+  Delegate* delegate_;  // Weak.
+
+  DISALLOW_COPY_AND_ASSIGN(TextServicesContextMenu);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_COCOA_TEXT_SERVICES_CONTEXT_MENU_H_