c# - .NET 自定义表单设计器 : How to implement IMenuCommandService?

Question

我有一个很久以前为数据库项目编写的报表设计器。它使用了很多 winapi 魔法，因此我被迫“以适当的方式”重写了一些部分。

感谢来自 MSDN 杂志的一些文章(here 和 here)和 CodeProject我能够实现设计器界面、工具箱和撤消/重做引擎。

1. 到目前为止，我发现的关于该主题的所有资源都有点过时了。你能指出新鲜/全面的文章吗？

2. 代码来自 article上面提到的似乎不起作用。

   MenuCommandService.ShowContextMenu 被调用但没有出现，因为 globalVerbs 集合中没有任何 DesignerVerbs。我应该添加“标准”的，对应于设计师的操作，如手动剪切/粘贴？如果是，我该如何完成？

Answer 1

感谢 SharpDevelop 资源，我能够找到解决方案

这个最小的实现(一些标准命令，仅此而已)对我有用

using System;
using System.Collections.Generic;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Windows.Forms;
using System.Drawing;

namespace DesignerHost
{
    class MenuCommandServiceImpl : MenuCommandService
    {
        DesignerVerbCollection m_globalVerbs = new DesignerVerbCollection();

        public MenuCommandServiceImpl(IServiceProvider serviceProvider)
            : base(serviceProvider)
        {
            m_globalVerbs.Add(StandartVerb("Cut", StandardCommands.Cut));
            m_globalVerbs.Add(StandartVerb("Copy", StandardCommands.Copy));
            m_globalVerbs.Add(StandartVerb("Paste", StandardCommands.Paste));
            m_globalVerbs.Add(StandartVerb("Delete", StandardCommands.Delete));
            m_globalVerbs.Add(StandartVerb("Select All", StandardCommands.SelectAll));

        }

        private DesignerVerb StandartVerb(string text, CommandID commandID)
        {
            return new DesignerVerb(text,
                delegate(object o, EventArgs e) 
                {
                    IMenuCommandService ms = 
                        GetService(typeof(IMenuCommandService)) as IMenuCommandService;
                    Debug.Assert(ms != null);
                    ms.GlobalInvoke(commandID); 
                }
            );
        }

        class MenuItem : ToolStripMenuItem
        {
            DesignerVerb verb;

            public MenuItem(DesignerVerb verb)
                : base(verb.Text)
            {
                Enabled = verb.Enabled;
                this.verb = verb;
                Click += InvokeCommand;
            }

            void InvokeCommand(object sender, EventArgs e)
            {
                try
                {
                    verb.Invoke();
                }
                catch (Exception ex)
                {
                    Trace.Write("MenuCommandServiceImpl: " + ex.ToString());
                }
            }
        }

        private ToolStripItem[] BuildMenuItems()
        {
            List<ToolStripItem> items = new List<ToolStripItem>();

            foreach (DesignerVerb verb in m_globalVerbs) 
            {
                items.Add(new MenuItem(verb));
            }
            return items.ToArray();
        }

        #region IMenuCommandService Members

        /// This is called whenever the user right-clicks on a designer.
        public override void ShowContextMenu(CommandID menuID, int x, int y)
        {
            // Display our ContextMenu! Note that the coordinate parameters to this method
            // are in screen coordinates, so we've got to translate them into client coordinates.

            ContextMenuStrip cm = new ContextMenuStrip();
            cm.Items.AddRange(BuildMenuItems());

            ISelectionService ss = GetService(typeof (ISelectionService)) as ISelectionService;
            Debug.Assert(ss != null);

            Control ps = ss.PrimarySelection as Control;
            Debug.Assert(ps != null);

            Point s = ps.PointToScreen(new Point(0, 0));
            cm.Show(ps, new Point(x - s.X, y - s.Y));
        }

        #endregion

    }
}

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