如何在 Windows 窗体 PropertyGrid 中捕获滚动事件

Question

我正在尝试同步两个属性网格的垂直滚动条。这个想法是当用户滚动一个属性网格时，另一个属性网格滚动相同的量。

我的第一种方法是处理滚动事件，但 PropertyGrid 似乎不会生成这种事件。我查看了 PropertyGrid 中包含的控件，并且有一个 PropertyGridView，我敢打赌它是带有滚动条的控件。

有人知道实现我想要的解决方法吗？

谢谢。

Answer 1

这个显示了与相邻的 PropertyGridView 的同步。请注意，您必须扩展它以处理用户单击任一控件。此版本更新 propertyGrid2 以匹配 propertyGrid1，但反之则不然。

using System;
using System.Windows.Forms;
using System.Reflection;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        Control m_pgv_1 = null;
        Control m_pgv_2 = null;
        MethodInfo m_method_info;

        public Form1 ()
        {
            InitializeComponent ();

            // Set the Property Grid Object to something
            propertyGrid1.SelectedObject = dataGridView1;
            propertyGrid2.SelectedObject = dataGridView1;

            // Loop through sub-controlls and find PropertyGridView
            m_pgv_1 = FindControl (propertyGrid1.Controls, "PropertyGridView");
            m_pgv_2 = FindControl (propertyGrid2.Controls, "PropertyGridView");

            // Reflection trickery to get a private/internal field
            // and method, scrollBar and SetScrollOffset in this case
            Type type = m_pgv_1.GetType ();
            FieldInfo f = FindField (type, "scrollBar");
            m_method_info = FindMethod (type, "SetScrollOffset");

            // Get the scrollBar for our PropertyGrid and add the event handler
            ((ScrollBar)f.GetValue (m_pgv_1)).Scroll +=
                new ScrollEventHandler (propertyGrid1_Scroll);
        }

        private void propertyGrid1_Scroll (object sender, ScrollEventArgs e)
        {
            System.Console.WriteLine ("Scroll");

            // Set the new scroll position on the neighboring
            // PropertyGridView
            object [] parameters = { e.NewValue };
            m_method_info.Invoke (m_pgv_2, parameters);
        }

        private static Control FindControl (
            Control.ControlCollection controls, string name)
        {
            foreach (Control c in controls)
            {
                if (c.Text == name)
                    return c;
            }

            return null;
        }

        private static MethodInfo FindMethod (Type type, string method)
        {
            foreach (MethodInfo mi in type.GetMethods ())
            {
                if (method == mi.Name)
                    return mi;
            }

            return null;
        }

        private static FieldInfo FindField (Type type, string field)
        {
            FieldInfo f = type.GetField (field,
               BindingFlags.Instance | BindingFlags.NonPublic);

            return f;
        }
    }
}

Answer 2

这需要一点技巧，但应该这样做：

using System;
using System.Windows.Forms;
using System.Reflection;

namespace WindowsApplication1 {
    public partial class Form1 : Form {
        Control m_pgv = null;

        public Form1 () {
            InitializeComponent ();

            // Set the Property Grid Object to something
            propertyGrid1.SelectedObject = dataGridView1;

            // Loop through sub-controls and find PropertyGridView
            foreach (Control c in propertyGrid1.Controls) {
                if (c.Text == "PropertyGridView")
                {
                    m_pgv = (Control)c;
                    break;
                }
            }

            // Reflection trickery to get a private field,
            // scrollBar in this case
            Type t = m_pgv.GetType ();
            FieldInfo f = t.GetField("scrollBar", 
                BindingFlags.Instance | BindingFlags.NonPublic);

            // Get the scrollBar for our PropertyGrid and add the event handler
            ScrollBar sb = (ScrollBar) f.GetValue(m_pgv);
            sb.Scroll +=  new ScrollEventHandler(propertyGrid1_Scroll);
        }

        private void propertyGrid1_Scroll (object sender, ScrollEventArgs e) {
            System.Console.WriteLine ("Scroll");
        }
    }
}