C#实现QQ聊天窗口

分析

• 需要两个TextBox,一个用于显示消息,一个用于编辑消息
• 需要四个按钮,分别控制关闭程序,清空正在编辑的消息,发送消息,抖动

原理

1. 在TextBox2中编辑消息并发送,在TextBox1中显示所发送的消息的同时使TextBox2中的消息清空
2. 发送的第一条消息TextBox1先保存并显示,发送第二条消息时将TextBox1事先的消息先打印出来接着显示第二条消息
3. 抖动原理:使窗口的left以及top发生变化(围绕窗体左上角为坐标原点考虑)加上Thread线程和for循环从而实现窗口抖动效果

程序中用到的重要属性

ReadOnly属性:设置文本为只读(true)textBox1.ReadOnly=true;

TabIndex属性:设置光标默认出现在哪里(0)textBox1.TabIndex=0;

Multiline属性:设置文本框可多行输入textBox1.Multiline=true;

Datetime:获取当前时间

“\r\n” 换行

AcceptButton属性:获取或设置当用户按Enter键时所单击的窗体上的按钮this.AcceptButton = button2;

Thread类:创建和控制线程Thread.Sleep(10);//设置执行完上一步停留时间 还需要创建命名空间using System.Threading;
Trim方法:textBox2.Text.Trim()=="")//Trim:移除当前textBox2对象位置前后的空白字符

具体代码如下:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;//设置多线程

namespace Test_QQ_chat_windows
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        { 
            //设置聊天窗口居中
            this.Left = Screen.PrimaryScreen.WorkingArea.Width / 2 - this.Width / 2;
            this.Top = Screen.PrimaryScreen.WorkingArea.Height / 2 - this.Height / 2;
            //聊天窗口命名
            this.Text = "和Know正在聊天";
            this.BackgroundImage = Image.FromFile("../../img/timg.jpg");//设置窗体背景图
            this.BackgroundImageLayout = ImageLayout.Stretch;//设置窗体背景图拉伸
            //textBox1设置只读
            textBox1.ReadOnly = true;
            //设置发送按钮可以用Enter键来触发
            this.AcceptButton = button2;
            this.Opacity = 0.8;//设置窗体透明度为0.2
            textBox1.BackColor = Color.DeepSkyBlue;
            textBox2.BackColor = Color.DeepPink;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.BackColor = Color.DeepSkyBlue;//设置窗体背景颜色
            textBox1.Text += "深夜食堂(36522224)" + DateTime.Now + "\r\n"+ "\r\n" + "您发送了一个窗口抖动" + "\r\n"+"\r\n";
            textBox2.Text = "";//设置发送内容后textBox2中无内容
            //窗口抖动
            int x = this.Left;
            int y = this.Top;
            for (int i = 0; i <= 3; i++)//设置抖动次数
            {
                this.Location = new Point(x - 3, y);
                Thread.Sleep(10);//设置执行完上一步停留时间
                this.Location = new Point(x - 3, y - 3);
                Thread.Sleep(10);
                this.Location = new Point(x, y - 3);
                Thread.Sleep(10);
                this.Location = new Point(x + 3, y - 3);
                Thread.Sleep(10);
                this.Location = new Point(x + 3, y);
                Thread.Sleep(10);
                this.Location = new Point(x + 3, y + 3);
                Thread.Sleep(10);
                this.Location = new Point(x, y + 3);
                Thread.Sleep(10);
                this.Location = new Point(x - 3, y + 3);
                Thread.Sleep(10);
                this.Location = new Point(x - 3, y);
                Thread.Sleep(10);
                this.Location = new Point(x, y);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //消息发送
            //判断textbox2中有无内容
            if (textBox2.Text == ""||textBox2.Text.Trim()=="")//Trim:移除当前textBox2对象位置前后的空白字符)
            {
               MessageBox.Show("输入不能为空值,请重新输入", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {
            	 textBox1.Text += "深夜食堂(36522224)" + DateTime.Now + "\r\n" + "\r\n" + textBox2.Text + "\r\n"+ "\r\n";
                textBox2.Text = "";//设置发送内容后textBox2中无内容
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            textBox2.Text = "";
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            //设置起始点在最后消息处
            this.textBox1.SelectionStart = this.textBox1.Text.Length;
            //内容滚动到最后消息处
            this.textBox1.ScrollToCaret();
        }
    }
}

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