1 题目描述

（1）Form1窗体设计界面如下：

（2）窗体左侧为一个靠左停靠的panel，其中包含一个label控件；
（3）初试状态时，“水平移动”选中，当用户单击“开始移动”按钮时，label在panel中水平从左向右移动，单击“暂停移动”按钮时，label停在原位置不动；
（4）在label移动过程中，若用户切换移动方式，则弹出对话框，提示先暂停移动；在label暂停移动时，用户切换移动方式，label在原位置以新的移动方式进行移动；

2 源码详解

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 Csharp7_2
{
   
    public partial class Form1 : Form
    {
   
        static int x = 0;
        static int y = 0;
        static int flag = 0;
        static int v = 0;
        static int h = 0;
        public Form1()
        {
   
            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
   
            if (radioButton1.Checked && flag == 1)
            {
   
                if (label1.Location.X + label1.Size.Width >= (panel1.Location.X + panel1.Size.Width))
                {
   
                    v = 1;
                }
                if (label1.Location.X < panel1.Location.X)
                {
   
                    v = 0;
                }
                if (v == 0)
                {
   
                    x = 1;
                    y = 0;
                }
                if (v == 1)
                {
   
                    x = -1;
                    y = 0;
                }
            }

            if (radioButton2.Checked && flag == 1)
            {
   
                if (label1.Location.Y + label1.Size.Height >= (panel1.Location.Y + panel1.Size.Height))
                {
   
                    h = 1;
                }
                if (label1.Location.Y < panel1.Location.Y)
                {
   
                    h = 0;
                }
                if (h == 0)
                {
   
                    x = 0;
                    y = 1;
                }
                if (h == 1)
                {
   
                    x = 0;
                    y = -1;
                }
            }

            if (flag == 1)
            {
   
                Point p = new Point(label1.Location.X + x, label1.Location.Y + y);
                label1.Location = p;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            flag = 1;
            timer1.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            flag = 0;
            timer1.Stop();
        }

        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
   
            if (radioButton2.Checked == true && flag == 1)
            {
   
                flag = 0;
                radioButton2.Checked = true;
                radioButton1.Checked = false;
                MessageBox.Show("请先停止移动");
            }
        }

        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
   
            if (radioButton1.Checked == true && flag == 1)
            {
   
                flag = 0;
                radioButton1.Checked = true;
                radioButton2.Checked = false;
                MessageBox.Show("请先停止移动");
            }
        }
    }
}