using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace WindowsFormsApp21 {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }
//重寫Closing（），關閉視窗時不退出程式，而是顯示在托盤圖示
//需要先在介面中新增一個 NotifyIcon控制元件，然後設定一個圖示
//有右鍵選單，則再新增一個ContextMenuStrip
        private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
            e.Cancel = true; //不退出程式
            this.WindowState = FormWindowState.Minimized; //最小化
            this.ShowInTaskbar = false; //在工作列中不顯示窗體
            this.notifyIcon1.Visible = true; //托盤圖示可見
        }

        //托盤圖示，滑鼠左鍵顯示回來原窗體，右鍵顯示退出
        private void notifyIcon1_MouseClick(object sender, MouseEventArgs e) {
            if (e.Button == MouseButtons.Left) {
                if (this.WindowState == FormWindowState.Minimized) {
                    this.Show();
                    this.WindowState = FormWindowState.Normal;
                    this.ShowInTaskbar = true;
                }
            }
            else {
                this.contextMenuStrip1.Show(Cursor.Position);
            }
        }

//退出選單
        private void contextMenuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e) {
            if (e.ClickedItem.Text.Equals("退出")) {
                this.Dispose();
                this.Close();
            }
        }
    }
}