xenadmin/XenAdmin/Controls/FilterSeveritiesToolStripDropDownButton.cs

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using System;
using System.ComponentModel;
using System.Windows.Forms;
using XenAdmin.Alerts;

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

        private bool _internalUpdating;

        private ToolStripMenuItem toolStripMenuItem0;
        private ToolStripMenuItem toolStripMenuItem1;
        private ToolStripMenuItem toolStripMenuItem2;
        private ToolStripMenuItem toolStripMenuItem3;
        private ToolStripMenuItem toolStripMenuItem4;
        private ToolStripMenuItem toolStripMenuItem5;
        private ToolStripMenuItem toolStripMenuItemAll;

        public FilterSeveritiesToolStripDropDownButton()
        {
            toolStripMenuItem0 = new ToolStripMenuItem
            {
                Text = Messages.SEVERITY_FILTER_0,
                Image = Images.StaticImages.alert6_16,
                ToolTipText = Messages.SEVERITY_FILTER_0_DETAIL
            };

            toolStripMenuItem1 = new ToolStripMenuItem
            {
                Text = Messages.SEVERITY_FILTER_1,
                Image = Images.StaticImages.alert1_16,
                ToolTipText = Messages.SEVERITY_FILTER_1_DETAIL
            };

            toolStripMenuItem2 = new ToolStripMenuItem
            {
                Text = Messages.SEVERITY_FILTER_2,
                Image = Images.StaticImages.alert2_16,
                ToolTipText = Messages.SEVERITY_FILTER_2_DETAIL
            };

            toolStripMenuItem3 = new ToolStripMenuItem
            {
                Text = Messages.SEVERITY_FILTER_3,
                Image = Images.StaticImages.alert3_16,
                ToolTipText = Messages.SEVERITY_FILTER_3_DETAIL
            };

            toolStripMenuItem4 = new ToolStripMenuItem
            {
                Text = Messages.SEVERITY_FILTER_4,
                Image = Images.StaticImages.alert4_16,
                ToolTipText = Messages.SEVERITY_FILTER_4_DETAIL
            };

            toolStripMenuItem5 = new ToolStripMenuItem
            {
                Text = Messages.SEVERITY_FILTER_5,
                Image = Images.StaticImages.alert5_16,
                ToolTipText = Messages.SEVERITY_FILTER_5_DETAIL
            };

            toolStripMenuItemAll = new ToolStripMenuItem
            {
                Text = Messages.FILTER_SHOW_ALL,
                Enabled = false
            };

            DropDownItems.AddRange(new ToolStripItem[]
            {
                toolStripMenuItem1,
                toolStripMenuItem2,
                toolStripMenuItem3,
                toolStripMenuItem4,
                toolStripMenuItem5,
                toolStripMenuItem0,
                new ToolStripSeparator(),
                toolStripMenuItemAll
            });

            NormalizeItems(toolStripMenuItem0, toolStripMenuItem1, toolStripMenuItem2, toolStripMenuItem3, toolStripMenuItem4, toolStripMenuItem5);

            toolStripMenuItem0.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItem1.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItem2.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItem3.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItem4.CheckedChanged += Item_CheckedChanged;
            toolStripMenuItem5.CheckedChanged += Item_CheckedChanged;
        }

        private void NormalizeItems(params ToolStripMenuItem[] items)
        {
            foreach (var item  in items)
            {
                item.Checked = true;
                item.CheckOnClick = true;
                item.ImageScaling = ToolStripItemImageScaling.None;
            }
        }

        public bool FilterIsOn =>
            !toolStripMenuItem0.Checked ||
            !toolStripMenuItem1.Checked ||
            !toolStripMenuItem2.Checked ||
            !toolStripMenuItem3.Checked ||
            !toolStripMenuItem4.Checked ||
            !toolStripMenuItem5.Checked;

        public bool HideBySeverity(AlertPriority priority)
        {
            return !((toolStripMenuItem1.Checked && priority == AlertPriority.Priority1)
                     || (toolStripMenuItem2.Checked && priority == AlertPriority.Priority2)
                     || (toolStripMenuItem3.Checked && priority == AlertPriority.Priority3)
                     || (toolStripMenuItem4.Checked && priority == AlertPriority.Priority4)
                     || (toolStripMenuItem5.Checked && priority == AlertPriority.Priority5)
                     || toolStripMenuItem0.Checked && priority == AlertPriority.Unknown);
        }

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

            if (e.ClickedItem == toolStripMenuItemAll)
            {
                _internalUpdating = true;
                toolStripMenuItem0.Checked = true;
                toolStripMenuItem1.Checked = true;
                toolStripMenuItem2.Checked = true;
                toolStripMenuItem3.Checked = true;
                toolStripMenuItem4.Checked = true;
                toolStripMenuItem5.Checked = true;
                _internalUpdating = false;
                
                Item_CheckedChanged(null, null);
            }
        }

        private void Item_CheckedChanged(object sender, EventArgs e)
        {
            if (!_internalUpdating)
            {
                toolStripMenuItemAll.Enabled = FilterIsOn;
                FilterChanged?.Invoke();
            }
        }
    }
}