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;

namespace FiveScreen
{
    public partial class FrmPainting1 : Form
    {
        bool isMouseDown = false; // 窗体是否移动
        Point currentFormLocation = new Point(); // 当前窗体位置
        Point currentMouseOffset = new Point(); // 当前鼠标的按下位置
        public FrmPainting1()
        {
            InitializeComponent();
            panel1.MouseDown += FrmInjection1_MouseDown;
            panel1.MouseMove += FrmInjection1_MouseMove;
            panel1.MouseUp += FrmInjection1_MouseUp;
            this.WindowState = FormWindowState.Maximized;
        }

        private void panel1_DoubleClick(object sender, EventArgs e)
        {
            //Application.Exit();
            if (this.WindowState == FormWindowState.Maximized)
            {
                this.WindowState = FormWindowState.Normal;
            }
            else
            {
                this.WindowState = FormWindowState.Maximized;
            }
        }

        private void FrmInjection1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                isMouseDown = true;
                currentFormLocation = this.Location;
                currentMouseOffset = Control.MousePosition;
            }
        }

        private void FrmInjection1_MouseMove(object sender, MouseEventArgs e)
        {
            int rangeX = 0, rangeY = 0; // 计算当前鼠标光标的位移，让窗体进行相同大小的位移
            if (isMouseDown)
            {
                Point pt = Control.MousePosition;
                rangeX = currentMouseOffset.X - pt.X;
                rangeY = currentMouseOffset.Y - pt.Y;
                this.Location = new Point(currentFormLocation.X - rangeX, currentFormLocation.Y - rangeY);
            }
        }

        private void FrmInjection1_MouseUp(object sender, MouseEventArgs e)
        {
            isMouseDown = false; // 停止移动
        }
    }
}