using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
using System.Text;
using System.Runtime.InteropServices;

namespace ControlLib.com
{
    /// <summary>
    /// 主界面标题栏
    /// </summary>
    public partial class FormTitleBar : UserControl
    {
        //换了背景要重新设置该值
        public static int TITLEHEIGHT = 18;

        private Form m_ParentForm = null;

        public FormTitleBar(Form ParentForm)
        {
            InitializeComponent();

            m_ParentForm = ParentForm;
            this.Width = m_ParentForm.Width+20;

            m_ParentForm.Resize += new EventHandler(ParentResize);
            FormTitleBar.TITLEHEIGHT = this.picBg.Height;
        }

        private void FormTitleBar_Load(object sender, EventArgs e)
        {
            Bitmap bit = (Bitmap)picBg.Image;
            Color c = bit.GetPixel(100, 10);
            lblTitle.BackColor = c;
            lblTitle.Text = m_ParentForm.Text;

            btnMax.Parent = picBg;
            btnRestore.Parent = picBg;
            lblTitle.Parent = picBg;
            lblTitle.BackColor = Color.Transparent;
            btnMin.Parent = picBg;
            btnClose.Parent = picBg;

            string sPath = System.Environment.CurrentDirectory + "/Images/formTitleBar/";
            
            btnMin.Init(sPath + "min.png", sPath + "min_on.png");

            btnMax.Init(sPath + "min_max.png", sPath + "min_max_on.png");

            btnRestore.Init(sPath + "min_max.png", sPath + "min_max_on.png");
            btnRestore.Visible = false;

            btnClose.Init(sPath + "colse.png", sPath + "close_on.png");

            Reset();
        }

        //设置几个按钮位置
        private void Reset()
        {
            btnClose.Left = m_ParentForm.Width - 30;

            btnRestore.Left = m_ParentForm.Width - 60+3;

            btnMax.Left = m_ParentForm.Width - 60+3;

            btnMin.Left = m_ParentForm.Width - 90+3;
        }

        //主窗体发生尺寸改变
        private void ParentResize(object sender, EventArgs e)
        {
            Reset();
        }

        //最小化
        private void btnMin_Click(object sender, EventArgs e)
        {
            m_ParentForm.WindowState = FormWindowState.Minimized;
        }

        //最大化
        private void btnMax_Click(object sender, EventArgs e)
        {
            m_ParentForm.WindowState = FormWindowState.Maximized;
            btnRestore.Visible = true;
            btnMax.Visible = false;
        }

        //普通
        private void btnRestore_Click(object sender, EventArgs e)
        {
            m_ParentForm.WindowState = FormWindowState.Normal;
            btnRestore.Visible = false;
            btnMax.Visible = true;
        }

        //关闭
        private void btnClose_Click(object sender, EventArgs e)
        {
            m_ParentForm.Close();
        }

        //双击(最大化和还原)
        private void picBg_DoubleClick(object sender, EventArgs e)
        {
            if(btnMax.Visible)
                btnMax_Click(null, null);
            else
                btnRestore_Click(null, null);
        }

        [DllImport("user32.dll")]
        public static extern void ReleaseCapture();

        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

        //private const int WM_NCHITTEST = 0x84;
        //private const int HTCLIENT = 0x1;
        private const int HTCAPTION = 0x0002;
        private const int WM_SYSCOMMAND = 0x0112;
        private const int SC_MOVE = 0xF010;

        private long preTick = DateTime.Now.Ticks;

        private void picBg_MouseDown(object sender, MouseEventArgs e)
        {
            long curTick = DateTime.Now.Ticks;
            //0.5秒内连续两次单机视为双击
            if ((curTick - preTick) < 500 * 10000)
                picBg_DoubleClick(null, null);
            preTick = curTick;

            ReleaseCapture();

            SendMessage(m_ParentForm.Handle, WM_SYSCOMMAND, (IntPtr)(SC_MOVE + HTCAPTION), IntPtr.Zero);
            
        }

        
    }
}