RichTextBox自动添加右键菜单 .

最新推荐文章于 2023-08-28 14:12:18 发布

转载最新推荐文章于 2023-08-28 14:12:18 发布 · 3.3k 阅读

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本文介绍了一个使用 C# 实现的 RichTextBox 控件上下文菜单的示例程序。该程序包括了常见的编辑操作如复制、剪切、粘贴等功能，并且能够根据当前文本选择状态动态调整菜单项的可用性。

http://blog.youkuaiyun.com/li0544/article/details/7406605

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using System.IO;

namespace Pub
{
public class CRichTestBoxMenu
{

        public ContextMenuStrip richMenu = new ContextMenuStrip();
        public ToolStripMenuItem CMcopy = new ToolStripMenuItem("复制");
        public ToolStripMenuItem CMcut = new ToolStripMenuItem("剪贴");
        public ToolStripMenuItem CMdel = new ToolStripMenuItem("删除");
        public ToolStripMenuItem CMcancle = new ToolStripMenuItem("撤销");
        public ToolStripMenuItem CMpaste = new ToolStripMenuItem("粘贴");
        public ToolStripMenuItem CMselectall = new ToolStripMenuItem("全选");
        public ToolStripMenuItem CMalign = new ToolStripMenuItem("右对齐");

public RichTextBox richTextBox;

        public CRichTestBoxMenu()
        {
            init();
        }

        public CRichTestBoxMenu(RichTextBox rchTBox)
        {
            richTextBox = rchTBox;
            richTextBox.ContextMenuStrip = richMenu;
            init();
        }

        public void init()
        {
            richMenu.Items.Add(CMcopy);
            richMenu.Items.Add(CMcut);
            richMenu.Items.Add(CMdel);
            richMenu.Items.Add(CMcancle);
            richMenu.Items.Add(CMpaste);
            richMenu.Items.Add(CMselectall);
            richMenu.Items.Add(CMalign);

            CMcopy.Click += CMcopy_Click;
            CMcut.Click += CMcut_Click;
            CMdel.Click += CMdel_Click;
            CMcancle.Click += CMcancle_Click;
            CMpaste.Click += CMpaste_Click;
            CMselectall.Click += CMselectall_Click;
            CMalign.Click += CMalign_Click;

richMenu.Opened += contextMenuStrip1_Opened;
}

        //右键菜单按钮可见
        private void contextMenuStrip1_Opened(object sender, EventArgs e)
        {
            if (richTextBox.SelectedText.Length > 0)
            {
                CMcopy.Enabled = true;
                CMcut.Enabled = true;
                CMdel.Enabled = true;
            }
            else
            {
                CMcopy.Enabled = false;
                CMcut.Enabled = false;
                CMdel.Enabled = false;
            }

            if (richTextBox.CanUndo == true)
            {
                this.CMcancle.Enabled = true;
            }
            else
            {
                this.CMcancle.Enabled = false;
            }

            if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text))
            {
                this.CMpaste.Enabled = true;
            }
            else
            {
                this.CMpaste.Enabled = false;
            }

            if (richTextBox.Text != "")
            {
                CMselectall.Enabled = true;
            }
            else
            {
                CMselectall.Enabled = false;
            }

}

        //右键菜单撤销
        private void CMcancle_Click(object sender, EventArgs e)
        {
            if (CMcancle.Enabled == true)
            {
                richTextBox.Undo();
                richTextBox.ClearUndo();
            }
        }

        //右键菜单剪切
        private void CMcut_Click(object sender, EventArgs e)
        {
            if (CMcut.Enabled == true)
            {
                richTextBox.Cut();
            }
        }

        //右键菜单复制
        private void CMcopy_Click(object sender, EventArgs e)
        {
            if (CMcopy.Enabled == true)
            {
                richTextBox.Copy();
            }
        }

        //右键菜单粘贴
        private void CMpaste_Click(object sender, EventArgs e)
        {
            if (CMpaste.Enabled == true)
            {
                richTextBox.Paste();
            }
        }

        //右键菜单删除
        private void CMdel_Click(object sender, EventArgs e)
        {
            if (CMdel.Enabled == true)
            {
                richTextBox.SelectedText = "";
            }
        }

        //右键菜单全选
        private void CMselectall_Click(object sender, EventArgs e)
        {
            richTextBox.SelectAll();
        }

        //右键菜单阅读顺序
        private void CMalign_Click(object sender, EventArgs e)
        {
            CMalign.Checked = !CMalign.Checked;
            if (CMalign.Checked == true)
            {
                richTextBox.SelectionAlignment = HorizontalAlignment.Right;
            }
            else
            {
                richTextBox.SelectionAlignment = HorizontalAlignment.Left;
            }
        }

}
}