xenadmin/XenAdmin/Controls/FilterStatusToolStripDropDownButton.cs

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 *     following disclaimer. 
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using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Windows.Forms;

using XenAdmin.Actions;

namespace XenAdmin.Controls
{
    public class FilterStatusToolStripDropDownButton : ToolStripDropDownButton
    {
        [Browsable(true)]
        public event Action FilterChanged;

        private bool internalUpdating;

        private ToolStripMenuItem toolStripMenuItemComplete;
        private ToolStripMenuItem toolStripMenuItemInProgress;
        private ToolStripMenuItem toolStripMenuItemError;
        private ToolStripMenuItem toolStripMenuItemCancelled;
        private ToolStripMenuItem toolStripMenuItemAll;

        public FilterStatusToolStripDropDownButton()
        {
            toolStripMenuItemComplete = new ToolStripMenuItem
                                            {
                                                Text = Messages.STATUS_FILTER_COMPLETE,
                                                Checked = true,
                                                CheckOnClick = true
                                            };
            toolStripMenuItemInProgress = new ToolStripMenuItem
                                              {
                                                  Text = Messages.STATUS_FILTER_IN_PROGRESS,
                                                  Checked = true,
                                                  CheckOnClick = true
                                              };
            toolStripMenuItemError = new ToolStripMenuItem
                                         {
                                             Text = Messages.STATUS_FILTER_ERROR,
                                             Checked = true,
                                             CheckOnClick = true
                                         };
            toolStripMenuItemCancelled = new ToolStripMenuItem
                {
                    Text = Messages.STATUS_FILTER_CANCEL,
                    Checked = true,
                    CheckOnClick = true
                };
            toolStripMenuItemAll = new ToolStripMenuItem
                {
                    Text = Messages.FILTER_SHOW_ALL,
                    Enabled = false
                };
            DropDownItems.AddRange(new ToolStripItem[]
                                       {
                                           toolStripMenuItemComplete,
                                           toolStripMenuItemInProgress,
                                           toolStripMenuItemError,
                                           toolStripMenuItemCancelled,
                                           new ToolStripSeparator(),
                                           toolStripMenuItemAll
                                       });

            toolStripMenuItemComplete.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItemInProgress.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItemError.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItemCancelled.CheckedChanged += Item_CheckedChanged;
        }

        public bool HideByStatus(ActionBase action)
        {
            bool cancelled = action.IsCompleted && !action.Succeeded && (action.Exception is CancelledException);
            bool error = action.IsCompleted && !action.Succeeded && !(action.Exception is CancelledException);

            return !((toolStripMenuItemComplete.Checked && action.Succeeded)
                || (toolStripMenuItemError.Checked && error)
                || (toolStripMenuItemInProgress.Checked && !action.IsCompleted)
                || (toolStripMenuItemCancelled.Checked && cancelled));
        }

        public bool FilterIsOn
        {
            get
            {
                return !toolStripMenuItemComplete.Checked
                    || !toolStripMenuItemInProgress.Checked
                    || !toolStripMenuItemError.Checked
                    || !toolStripMenuItemCancelled.Checked;
            }
        }

        protected override void OnDropDownItemClicked(ToolStripItemClickedEventArgs e)
        {
            base.OnDropDownItemClicked(e);

            if (e.ClickedItem == toolStripMenuItemAll)
            {
                internalUpdating = true;
                toolStripMenuItemComplete.Checked = true;
                toolStripMenuItemInProgress.Checked = true;
                toolStripMenuItemError.Checked = true;
                toolStripMenuItemCancelled.Checked = true;
                internalUpdating = false;

                Item_CheckedChanged(null, null);
            }
        }

        private void Item_CheckedChanged(object sender, EventArgs e)
        {
            if (!internalUpdating)
            {
                toolStripMenuItemAll.Enabled = FilterIsOn;

                if (FilterChanged != null)
                    FilterChanged();
            }
        }
    }
}