xenadmin/XenAdmin/Controls/MainWindowControls/NavigationDropDownButton.cs

/* Copyright (c) Cloud Software Group, Inc. 
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using System;
using System.Drawing;
using System.Windows.Forms;

namespace XenAdmin.Controls.MainWindowControls
{
    class NavigationDropDownButton : ToolStripDropDownButton, INavigationItem
    {
        private ToolStripItem[] m_itemList;
        private bool m_resettingItemList;

        protected NavigationDropDownButton()
        {
            Overflow = ToolStripItemOverflow.Never;
        }

        public INavigationItem PairedItem { get; set; }
        public event Action<object> NavigationViewChanged;

        public void SetItemList(ToolStripItem[] items)
        {
            if (m_resettingItemList)
                return;

            m_resettingItemList = true;
            
            m_itemList = items;

            var pairedButton = PairedItem as NavigationDropDownButton;
            if (pairedButton != null)
                pairedButton.SetItemList(items);
            
            m_resettingItemList = false;
        }

        protected override void OnDropDownShow(EventArgs e)
        {
            DropDownItems.Clear();
            DropDownItems.AddRange(m_itemList);
            base.OnDropDownShow(e);
        }

        protected override void OnDropDownItemClicked(ToolStripItemClickedEventArgs e)
        {
            if (e.ClickedItem is ToolStripMenuItem curItem && !curItem.Checked)
            {
                foreach (var it in DropDownItems)
                {
                    if (it is ToolStripMenuItem item)
                        item.Checked = item == curItem;
                }

                NavigationViewChanged?.Invoke(curItem.Tag);
            }
            base.OnDropDownItemClicked(e);
        }
    }


    class NavigationDropDownButtonBig : NavigationDropDownButton
    {
        public NavigationDropDownButtonBig()
        {
            ImageAlign = ContentAlignment.MiddleLeft;
            ImageScaling = ToolStripItemImageScaling.None;
        }
    }


    class NavigationDropDownButtonSmall : NavigationDropDownButton
    {
        public NavigationDropDownButtonSmall()
        {
            Alignment = ToolStripItemAlignment.Right;
            ImageScaling = ToolStripItemImageScaling.None;
        }
    }
}