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// 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 CHROME_VIEWS_COMBO_BOX_H__
#define CHROME_VIEWS_COMBO_BOX_H__
#include "chrome/views/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);
// Overriden from View.
virtual gfx::Size GetPreferredSize();
// Overriden 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 // CHROME_VIEWS_COMBO_BOX_H__
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