CLR自定义菜单项（ToolStripItem）

新建ToolStripColor.h

让类ToolStripColor继承自ToolStripControlHost实现，则ToolStripColor的对象并可以作为一个MenuItem添加到一个菜单中了

示例代码如下（此代码是基于上一个随笔中自定义的颜色设置控件实现）：

#pragma once

#include <string>

namespace TestDIYMenuItem {

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;
    using namespace SelfColorControl;

    /// <summary>
    /// WinForm自定义菜单项：颜色设置菜单
    /// </summary>
    /// <remarks>
    /// 基于自定义UserControl:SelfColorControl.dll
    /// </remarks>
    public ref class ToolStripColor : public System::Windows::Forms::ToolStripControlHost
    {
    public:
        /// <summary>
        ///    事件回调委托类型
        /// </summary>
        delegate void ValueChangedHandler(void);
        /// <summary>
        ///    时间回调句柄
        /// </summary>
        event ValueChangedHandler^ pCallBack;

    public:
        ToolStripColor() : ToolStripControlHost(CreateControlInstance())
        {
            InitializeComponent();
        }

        ToolStripColor(std::string name): ToolStripControlHost(CreateControlInstance())
        {
            this->Name = "asdf";
            InitializeComponent();
        }
        
    public:
        /// <summary>
        ///    获取当前值
        /// </summary>
        System::Drawing::Color GetValue()
        {
            return colorCtrl->CurValue;
        }
    
        /// <summary>
        ///    设置当前值
        /// </summary>
        void SetValue(System::Drawing::Color color)
        {
            colorCtrl->CurValue = color;
        }

    private:
        static SelfColorControl::ColorControl^ colorCtrl = gcnew SelfColorControl::ColorControl();
        
        static System::Windows::Forms::Control^ CreateControlInstance()
        {
            colorCtrl->AutoSize = false;
            return colorCtrl;
        }

        void InitializeComponent(void)
        {
            colorCtrl->ValueChanged += gcnew ColorControl::ColorValueChangedHandler(this, &ToolStripColor::colorCtrl_ValueChanged);
            this->AutoSize = false;
        }

        // <summary>
        ///    手动添加，自定义控件SelfColorControl的ValueChanged响应函数
        /// </summary>
        void colorCtrl_ValueChanged(System::Object^ object, System::EventArgs^ e)
        {
            //自定义事件回调
            pCallBack();
        }
    };


}

这样定义的自定义菜单项使用起来比较简单：

//定义一个新的菜单项，TestDIYMenuItem是ToolStripColor的命名空间，如上述代码所示

private:TestDIYMenuItem::ToolStripColor^ toolStripColor;

//new一个菜单项

this->toolStripColor = (gcnew TestDIYMenuItem::ToolStripColor());

//将新建的颜色菜单项加入菜单对象

contextMenuStrip1->Items->Add(toolStripColor);