winform 的textbox 鼠标拖动

这个窗体有3个TextBox控件，控件ID分别是textBox1,textBox2,textBox3

两个button,分别为button1,button2

其实这个就是通过mousedown.mouseup,mousemove   三个事件来控制，实现textbox的长度可变，窗体的宽度可变

Code
//定义一个布尔变量，作为事件的开关。
        bool b = false;
        //定义一个布尔变量，作为窗体大小改变的开关。
        bool bFormChange = false;
        //定义一个‘点’的变量，接收鼠标的点位置。
        Point mousePonit;

        private void Form2_MouseDown(object sender, MouseEventArgs e)
        {
            if (this.Cursor == System.Windows.Forms.Cursors.SizeWE && e.Button == MouseButtons.Left)
            {
                bFormChange = true;
            } 
            //考虑是否鼠标左键按下，如果按下则开始做以下的事情。
            else if (e.Button == MouseButtons.Left)
            {
                //给mousePonit定义为当前的鼠标位置坐标。
                mousePonit = new Point(-e.X, -e.Y);
                //设置变量b为布尔真值。
                b = true;
            }
        }

        private void Form2_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.X >= this.Width - 3)
            {
                this.Cursor = System.Windows.Forms.Cursors.SizeWE;
            }
            else
            {
                this.Cursor = System.Windows.Forms.Cursors.Hand;
            }

            int tempWidth = textBox1.Size.Width + textBox2.Size.Width + textBox3.Size.Width + 100;
            if (bFormChange && e.X <= 1000 && e.X >= tempWidth) 
            {
                this.Size = new System.Drawing.Size(e.X+ 1, 23);
                this.button2.Location = new System.Drawing.Point(e.X - 25, 1);
                this.button1.Location = new System.Drawing.Point(e.X - 50, 1);
            }

            //如果获取b为真的时候，开始执行下面的语句。
            if (b)
            {
                //定义一个‘点’变量，为组件的鼠标光标位置
                Point p = Control.MousePosition;
                //平移mousePonit为p变量。
                p.Offset(mousePonit);
                //控件的位置，为p位置。
                this.Location = p;
            }
        }

        private void Form2_MouseUp(object sender, MouseEventArgs e)
        {
            bFormChange = false;
            b = false;
        }

        // 关于txt1拖动
        bool txt1MoveFlg = false;

        private void textBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (this.textBox1.Cursor == System.Windows.Forms.Cursors.SizeWE && e.Button == MouseButtons.Left)
            {
                txt1MoveFlg = true;
            }
        }

        private void textBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.X >= textBox1.Size.Width - 3)
            {
                this.textBox1.Cursor = System.Windows.Forms.Cursors.SizeWE;
            }
            else
            {
                this.textBox1.Cursor = System.Windows.Forms.Cursors.IBeam;
            }

            int tempWidth = e.X + textBox2.Size.Width + textBox3.Size.Width + 100;
            if (txt1MoveFlg && e.X >= 40 && tempWidth <= this.Width)
            {
                this.textBox1.Size = new System.Drawing.Size(e.X + 1, 19);
                this.textBox2.Location = new System.Drawing.Point(textBox1.Size.Width + 25, 1);
                this.textBox3.Location = new System.Drawing.Point(textBox1.Size.Width + textBox2.Size.Width+ 40, 1);
            }
        }

        private void textBox1_MouseUp(object sender, MouseEventArgs e)
        {
            txt1MoveFlg = false;
        }

        // 关于txt2拖动
        bool txt2MoveFlg = false;

        private void textBox2_MouseDown(object sender, MouseEventArgs e)
        {
            if (this.textBox2.Cursor == System.Windows.Forms.Cursors.SizeWE && e.Button == MouseButtons.Left)
            {
                txt2MoveFlg = true;
            }
        }

        private void textBox2_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.X >= textBox2.Size.Width - 3)
            {
                this.textBox2.Cursor = System.Windows.Forms.Cursors.SizeWE;
            }
            else
            {
                this.textBox2.Cursor = System.Windows.Forms.Cursors.IBeam;
            }

            int tempWidth = e.X + textBox1.Size.Width + textBox3.Size.Width + 100;
            if (txt2MoveFlg && e.X >= 40 && tempWidth <= this.Width)
            {
                this.textBox2.Size = new System.Drawing.Size(e.X + 1, 19);
                this.textBox3.Location = new System.Drawing.Point(textBox1.Size.Width + textBox2.Size.Width + 40, 1);
            }
        }

        private void textBox2_MouseUp(object sender, MouseEventArgs e)
        {
            txt2MoveFlg = false;
        }

        // 关于txt3拖动
        bool txt3MoveFlg = false;
        private void textBox3_MouseDown(object sender, MouseEventArgs e)
        {
            if (this.textBox3.Cursor == System.Windows.Forms.Cursors.SizeWE && e.Button == MouseButtons.Left)
            {
                txt3MoveFlg = true;
            }
        }

        private void textBox3_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.X >= textBox3.Size.Width - 3)
            {
                this.textBox3.Cursor = System.Windows.Forms.Cursors.SizeWE;
            }
            else
            {
                this.textBox3.Cursor = System.Windows.Forms.Cursors.IBeam;
            }

            int tempWidth = e.X + textBox1.Size.Width + textBox2.Size.Width + 100;
            if (txt3MoveFlg && e.X >= 40 && tempWidth <= this.Width)
            {
                this.textBox3.Size = new System.Drawing.Size(e.X + 1, 19);
            }
        }

        private void textBox3_MouseUp(object sender, MouseEventArgs e)
        {
            txt3MoveFlg = false;
        }

转载于:https://www.cnblogs.com/libiao/archive/2009/10/28/1591483.html