apewer-dotnet/Apewer.Windows/WinForm/Extensions.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace Apewer.WinForm
{

    /// <summary>Windows 窗体工具。</summary>
    public static class Extensions
    {

        static void MenuItemEventHandler(object sender, EventArgs e)
        {
#if NETFRAMEWORK
            var mi = sender as System.Windows.Forms.MenuItem;
            if (mi != null)
            {
                var tag = mi.Tag as MenuItem;
                if (tag != null && tag.Action != null) tag.Action.Invoke(tag);
            }
#endif

            var tsmi = sender as System.Windows.Forms.ToolStripMenuItem;
            if (tsmi != null)
            {
                var tag = tsmi.Tag as MenuItem;
                if (tag != null && tag.Action != null) tag.Action.Invoke(tag);
            }
        }

#if NETFRAMEWORK

        /// <summary>生成 <see cref="System.Windows.Forms.ContextMenu" /> 实例。</summary>
        /// <exception cref="ArgumentNullException"></exception>
        public static ContextMenu ContextMenu(this IEnumerable<MenuItem> items)
        {
            if (items == null) throw new ArgumentNullException(nameof(items));

            var cm = new ContextMenu();
            foreach (var item in items)
            {
                var isLine = item == null || item.Text == null || item.Text == "" || item.Text == "-";
                var text = isLine ? "-" : item?.Text;
                var mi = new System.Windows.Forms.MenuItem(text, MenuItemEventHandler);
                mi.Enabled = !isLine && item.Action != null;
                mi.Tag = item;

                cm.MenuItems.Add(mi);
            }

            return cm;
        }

#endif

        /// <summary>生成 <see cref="ContextMenuStrip" /> 实例。</summary>
        /// <exception cref="ArgumentNullException"></exception>
        public static ContextMenuStrip ContextMenuStrip(this IEnumerable<MenuItem> items)
        {
            if (items == null) throw new ArgumentNullException(nameof(items));

            var cms = new ContextMenuStrip();
            foreach (var item in items)
            {
                if (item == null) continue;

                var isLine = item.Text == null || item.Text == "" || item.Text == "-";
                var text = isLine ? "-" : item.Text;
                var tsmi = new ToolStripMenuItem(text, null, MenuItemEventHandler);
                tsmi.AutoSize = true;
                tsmi.Height = isLine ? 19 : 30;
                tsmi.Enabled = item.Action != null && item.Action != null;
                tsmi.Tag = item;

                cms.Items.Add(tsmi);
            }

            return cms;
        }

    }

}