Make Combobox portable

views/controls/combo_box.h

-// Copyright (c) 2006-2008 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 VIEWS_CONTROLS_COMBO_BOX_H_
-#define VIEWS_CONTROLS_COMBO_BOX_H_
-
-#include "views/controls/native_control.h"
-
-namespace views {
-////////////////////////////////////////////////////////////////////////////////
-//
-// ComboBox is a basic non editable combo box. It is initialized from a simple
-// model.
-//
-////////////////////////////////////////////////////////////////////////////////
-class ComboBox : public NativeControl {
- public:
-  class Model {
-   public:
-    // Return the number of items in the combo box.
-    virtual int GetItemCount(ComboBox* source) = 0;
-
-    // Return the string that should be used to represent a given item.
-    virtual std::wstring GetItemAt(ComboBox* source, int index) = 0;
-  };
-
-  class Listener {
-   public:
-    // This is invoked once the selected item changed.
-    virtual void ItemChanged(ComboBox* combo_box,
-                             int prev_index,
-                             int new_index) = 0;
-  };
-
-  // |model is not owned by the combo box.
-  explicit ComboBox(Model* model);
-  virtual ~ComboBox();
-
-  // Register |listener| for item change events.
-  void SetListener(Listener* listener);
-
-  // Overridden from View.
-  virtual gfx::Size GetPreferredSize();
-  virtual bool OverrideAccelerator(const Accelerator& accelerator);
-
-  // Overridden from NativeControl
-  virtual HWND CreateNativeControl(HWND parent_container);
-  virtual LRESULT OnCommand(UINT code, int id, HWND source);
-  virtual LRESULT OnNotify(int w_param, LPNMHDR l_param);
-
-  // Inform the combo box that its model changed.
-  void ModelChanged();
-
-  // Set / Get the selected item.
-  void SetSelectedItem(int index);
-  int GetSelectedItem();
-
- private:
-  // Update a combo box from our model.
-  void UpdateComboBoxFromModel(HWND hwnd);
-
-  // Our model.
-  Model* model_;
-
-  // The current selection.
-  int selected_item_;
-
-  // Item change listener.
-  Listener* listener_;
-
-  // The min width, in pixels, for the text content.
-  int content_width_;
-
-  DISALLOW_EVIL_CONSTRUCTORS(ComboBox);
-};
-
-}  // namespace views
-
-#endif  // VIEWS_CONTROLS_COMBO_BOX_H_