xenadmin/XenAdmin/Controls/DecentGroupBox.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.ComponentModel;
using System.Linq;
using System.Windows.Forms;

using XenAdmin.Core;


namespace XenAdmin.Controls
{
    /// <summary>
    /// A System.Windows.Forms.GroupBox with the additional property 'UseMnemonic'.
    /// </summary>
    public class DecentGroupBox : GroupBox
    {
        private bool useMnemonic;
        /// <summary>
        /// If set to true, any ampersands in the Text property are interpreted as keyboard shortcuts. Otherwise the ampersands are rendered correctly.
        /// </summary>
        [DefaultValue(false)]
        public bool UseMnemonic
        {
            get
            {
                return useMnemonic;
            }
            set
            {
                useMnemonic = value;
                RefreshText();
            }
        }

        private string rawText;
        public new string Text
        {
            get
            {
                return rawText;
            }
            set
            {
                rawText = value;
                RefreshText();
            }
        }

        private bool autoEllipsis = true;
        [DefaultValue(true)]
        public bool AutoEllipsis
        {
            get
            {
                return autoEllipsis;
            }
            set
            {
                autoEllipsis = value;
                RefreshText();
            }
        }

        /// <summary>
        /// The text that has been passed to the base System.Windows.Forms.GroupBox class, escaped as necessary.
        /// </summary>
        protected String EscapedText
        {
            get
            {
                return base.Text;
            }
        }

        private const int FUDGE = 15;

        private void RefreshText()
        {
            string newText = rawText;
            if (!useMnemonic)
                newText = rawText.EscapeAmpersands();

            int maxWidth = Width - FUDGE;
            if (maxWidth <= 0)
            {
                // Cope with excessively narrow groupboxes
                base.Text = String.Empty;
                return;
            }

            if (autoEllipsis && newText != null)
            {
                using (Graphics g = CreateGraphics())
                {
                    newText = newText.Ellipsise(new Rectangle(0, 0, maxWidth, Height), Font);
                    if (newText == ".") //If ellipsise shortens the string to less than the ellipsis
                    {
                        base.Text = String.Empty;
                        return;
                    }
                }

                //Avoid sending &... to the base class, so ensure we have an even number of ampersands on the end of the string.
                if (!useMnemonic && newText.Count(c => c == '&') % 2 > 0)
                    newText = newText.Remove(newText.LastIndexOf('&'), 1);
            }

            base.Text = newText;
        }

        protected override void OnSizeChanged(EventArgs e)
        {
            RefreshText();            
            base.OnSizeChanged(e);
        }
    }
}