// Copyright (C) 2004  Daniel Grunwald
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// For more information read the file "LICENSE.txt".

using System;
using System.Drawing;
using System.Windows.Forms;

namespace Grunwald.Gui.Controls
{
	/// <summary>
	/// A button that automatically resizes to fit its text.
	/// </summary>
	public class AutoSizedButton : Button
	{
		int defaultWidth;
		
		/// <summary>
		/// Creates a new AutoSizedButton.
		/// </summary>
		public AutoSizedButton()
		{
			this.FlatStyle = FlatStyle.System;
			defaultWidth = this.Width;
		}
		
		/// <summary>
		/// Creates a new AutoSizedButton with the specified text.
		/// </summary>
		public AutoSizedButton(string text) : this()
		{
			this.Text = text;
		}
		
		/// <summary>
		/// Raises the <see cref="Control.TextChanged"/> event.
		/// </summary>
		protected override void OnTextChanged(System.EventArgs e)
		{
			base.OnTextChanged(e);
			using (Graphics g = CreateGraphics())  {
				SizeF size = g.MeasureString(this.Text, this.Font);
				int w = ((int)Math.Ceiling(size.Width / 8.0) + 1) * 8;
				if (this.Text != "...") {
					if (w < defaultWidth) w = defaultWidth;
				}
				if (w != this.Width)
					this.Width = w;
			}
		}
	}
}