// This file (ComboBoxUtils.cs) is a part of the IBBoard.GtkSharp project and is copyright 2010 IBBoard
// 
// The file and the library/program it is in are licensed and distributed, without warranty, under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING for more information and the full license.

using System;
using System.Collections.Generic;
using Gtk;

namespace IBBoard.GtkSharp
{
	public delegate string ObjectToStringRenderingMethod<OBJECT_TYPE>(OBJECT_TYPE obj);
	
	public class ComboBoxUtils
	{
		private static int DEFAULT_VALUE_COLUMN = 1;
		private static int DEFAULT_TEXT_COLUMN = 0;
			
		public static void FillCombo<LIST_TYPE>(ComboBox combo, IList<LIST_TYPE> itemList)
		{
			FillCombo(combo, itemList, delegate(LIST_TYPE obj){return obj.ToString();});
		}
		
		public static void FillCombo<LIST_TYPE>(ComboBox combo, IList<LIST_TYPE> itemList, ObjectToStringRenderingMethod<LIST_TYPE> objectToString)
		{
			combo.Clear();
			CellRendererText cell = new CellRendererText();
			combo.PackStart(cell, false);
			combo.AddAttribute(cell, "text", 0);
			Type[] types = new Type[2];
			types[DEFAULT_VALUE_COLUMN] = typeof(LIST_TYPE);
			types[DEFAULT_TEXT_COLUMN] = typeof(string);
			ListStore store = new ListStore(types);
			combo.Model = store;
		
			foreach (LIST_TYPE item in itemList)
			{
				object[] values = new object[2];
				values[DEFAULT_VALUE_COLUMN] = item;
				values[DEFAULT_TEXT_COLUMN] = objectToString(item);
				store.AppendValues(values);
			}
		}
		
		public static void SelectItem(ComboBox combo, object item)
		{
			TreeModel model = combo.Model;
			TreeIter iter;
			model.GetIterFirst(out iter);
			
	   		do
			{
				GLib.Value rowItem = new GLib.Value();
				combo.Model.GetValue(iter, DEFAULT_VALUE_COLUMN, ref rowItem);
				
				if (item.Equals(rowItem.Val))
				{
						combo.SetActiveIter(iter);
						break;
				}
			}
			while (combo.Model.IterNext(ref iter));
		}
		
		public static void SelectIndex(ComboBox combo, int idx)
		{
			Gtk.TreeIter iter;
			combo.Model.IterNthChild(out iter, idx);
			combo.SetActiveIter(iter);
		}
		
		public static LIST_TYPE GetSelectedItem<LIST_TYPE>(ComboBox combo)
		{
			return GetSelectedItem<LIST_TYPE>(combo, DEFAULT_VALUE_COLUMN);
		}
		
		public static LIST_TYPE GetSelectedItem<LIST_TYPE>(ComboBox combo, int valueColumn)
		{
			TreeIter iter;
			combo.GetActiveIter(out iter);
			return (LIST_TYPE)combo.Model.GetValue(iter, valueColumn);
		}
	}
}