[MacViews] Implemented text context menu

ui/base/cocoa/text_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_CONTEXT_MENU_H_
+#define UI_BASE_COCOA_TEXT_CONTEXT_MENU_H_
+
+#include "base/macros.h"
+#include "base/strings/sys_string_conversions.h"
+#include "ui/base/models/simple_menu_model.h"
+
+class TextContextMenu : public ui::SimpleMenuModel::Delegate {

[tapted, 2016/07/22 03:06:42]

Maybe TextServicesContextMenu? (also namespace ui. the class should have a
comment too)

[spqchan, 2016/12/12 19:32:27]

Done.

+ public:
+  class UI_BASE_EXPORT Delegate {
+   public:
+    virtual void StartSpeaking() = 0;

[tapted, 2016/07/22 03:06:42]

I think we should rename this to something like

OnSpeakRequested()

alternatively, the separation might be nicer with something like:

virtual void ProvideTextForSpeaking(const base::Callback<void(std::string16)>&
callback) = 0;

This hides details about speech operation from the delegate -- it just becomes a
"selected text provider"

But since |callback| will always be &SpeakText, I couldn't convince myself that
this is actually any better than having the delegate just call SpeakText. (but
OnSpeakRequested() should get a comment saying the delegate is expected to call
SpeakText)

[spqchan, 2016/12/12 19:32:27]

Done.

+  };
+
+  TextContextMenu(Delegate* delegate);

[tapted, 2016/07/22 03:06:42]

explicit

[spqchan, 2016/12/12 19:32:27]

Done.

+
+  void AppendToContextMenu(ui::SimpleMenuModel* model);
+
+  static void SpeakText(const base::string16& text);
+  static void StopSpeaking();
+
+  static bool SupportsSpeech();
+  static bool IsSpeaking();
+
+  // SimpleMenuModel::Delegate implementation.
+  void ExecuteCommand(int command_id, int event_flags) override;
+  bool IsCommandIdChecked(int command_id) const override;
+  bool IsCommandIdEnabled(int command_id) const override;
+
+ protected:
+  bool GetAcceleratorForCommandId(int command_id,
+                                  ui::Accelerator* accelerator) override;
+
+ private:
+  // Model for the "Speech" submenu.
+  ui::SimpleMenuModel speech_submenu_model_;
+
+  Delegate* delegate_;  // weak
+
+  DISALLOW_COPY_AND_ASSIGN(TextContextMenu);
+};
+
+#endif  // UI_BASE_COCOA_TEXT_CONTEXT_MENU_H_