c# tab页标画上关闭按钮

最新推荐文章于 2020-09-19 14:45:25 发布

原创最新推荐文章于 2020-09-19 14:45:25 发布 · 1.9k 阅读

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本文介绍如何使用C#在Windows Forms应用程序中实现自定义TabControl，包括添加关闭按钮并响应点击事件以移除选项卡。

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

namespace qqqqq
{
    public partial class Form1 : Form
    {
        public Form1()
            : base()
        {
            InitializeComponent();
        }
        private Icon icon = null;
        int PageMaxIndex = 0;
        private void button1_Click(object sender, System.EventArgs e)
        {
            PageMaxIndex++;
            tabControl1.TabPages.Add(new TabPage("ABC-" + PageMaxIndex));

        }

        //关闭区域的宽高
        const int CLOSE_SIZE = 15;
        //重画
        private void tabControl1_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
        {
            Graphics g = e.Graphics;
            using (Pen p = new Pen(this.ForeColor))
            {
                Rectangle myTabRect = tabControl1.GetTabRect(e.Index);
                //把字写上
                g.DrawString(tabControl1.TabPages[e.Index].Text
                , this.Font
                , SystemBrushes.ControlText
                , myTabRect.X + 2, myTabRect.Y + 2);
                //模拟绘制一个区域表示关闭的的地方（是一个红色的方块区域）
                //当然大多时候画一个图就可以了 12*12的
                myTabRect.Offset(myTabRect.Width - (CLOSE_SIZE + 3), 2);
                myTabRect.Width = CLOSE_SIZE;
                myTabRect.Height = CLOSE_SIZE;
                //g.DrawRectangle(p, myTabRect);
                icon = qqqqq.Properties.Resources._2;
                g.DrawIcon(icon, myTabRect);

            }

        }
        private void tabControl1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {

            if (e.Button == MouseButtons.Left)
            {
                int x = e.X, y = e.Y;
                //计算关闭区域
                Rectangle myTabRect = tabControl1.GetTabRect(tabControl1.SelectedIndex);

                myTabRect.Offset(myTabRect.Width - (CLOSE_SIZE + 3), 2);
                myTabRect.Width = CLOSE_SIZE;
                myTabRect.Height = CLOSE_SIZE;

                //如果鼠标在区域内就关闭选项卡
                bool isClose = x > myTabRect.X
                && x < myTabRect.Right
                && y > myTabRect.Y
                && y < myTabRect.Bottom;

                if (isClose)
                {
                    tabControl1.TabPages.Remove(tabControl1.SelectedTab);
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //设置若干属性
            tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed;
            tabControl1.Padding = new System.Drawing.Point(15, 0);
            tabControl1.DrawItem += new DrawItemEventHandler(tabControl1_DrawItem);
            tabControl1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tabControl1_MouseDown);
        }

        private void tabPage1_Click(object sender, EventArgs e)
        {

        }
    }
}