Make Combobox portable

views/controls/combobox/native_combobox_win.h

+// Copyright (c) 2009 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_COMBOBOX_NATIVE_COMBOBOX_WIN_H_
+#define VIEWS_CONTROLS_COMBOBOX_NATIVE_COMBOBOX_WIN_H_
+
+#include "views/controls/combobox/native_combobox_wrapper.h"
+#include "views/controls/native_control_win.h"
+
+namespace views {
+
+class NativeComboboxWin : public NativeControlWin,
+                          public NativeComboboxWrapper {
+ public:
+  explicit NativeComboboxWin(Combobox* combobox);
+  virtual ~NativeComboboxWin();
+
+  // Overridden from NativeComboboxWrapper:
+  virtual void UpdateFromModel();
+  virtual void UpdateSelectedItem();
+  virtual void UpdateEnabled();
+  virtual int GetSelectedItem() const;
+  virtual bool IsDropdownOpen() const;
+  virtual gfx::Size GetPreferredSize() const;
+  virtual View* GetView();
+  virtual void SetFocus();
+
+ protected:
+  // Overridden from NativeControlWin:
+  virtual bool ProcessMessage(UINT message,
+                              WPARAM w_param,
+                              LPARAM l_param,
+                              LRESULT* result);
+  virtual void CreateNativeControl();
+  virtual void NativeControlCreated(HWND native_control);
+  
+ private:
+  void UpdateFont();
+
+  // The combobox we are bound to.
+  Combobox* combobox_;
+
+  // The min width, in pixels, for the text content.
+  int content_width_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeComboboxWin);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_CONTROLS_COMBOBOX_NATIVE_COMBOBOX_WIN_H_