using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DllXqManager
{
    public class MoveControl
    {
        #region Constructors
        public MoveControl(Control ctrl,ContextMenuStrip cms)
        {
            currMenu = cms;
            currentControl = ctrl;
            currentControl.Tag = this;//绑定当前实例
            AddEvents();
            CurrList.Add(this);
        }
        #endregion

        #region Fields
        public Control currentControl; //传入的控件
        private Point pPoint; //上个鼠标坐标
        private Point cPoint; //当前鼠标坐标
        public FrameControl fc;//边框控件
        private ContextMenuStrip currMenu = null;
        public bool IsSelected = false;//标记该控件是否选择
        public static List<MoveControl> CurrList = new List<MoveControl>();
        public static Control CurrParent =null;//父容器，不从单个实例取
        #endregion

        #region Properties

        #endregion

        #region Methods
        /// <summary>
        /// 挂载事件
        /// </summary>
        private void AddEvents()
        {
            currentControl.MouseClick += new MouseEventHandler(MouseClick);
            currentControl.MouseDown += new MouseEventHandler(MouseDown);
            currentControl.MouseMove += new MouseEventHandler(MouseMove);
            currentControl.MouseUp += new MouseEventHandler(MouseUp);
        }

        /// <summary>
        /// 绘制拖拉时的黑色边框
        /// </summary>
        public static  void DrawDragBound(Control ctrl)
        {
            ctrl.Refresh();
            Graphics g = ctrl.CreateGraphics();
            int width = ctrl.Width;
            int height = ctrl.Height;
            Point[] ps = new Point[5]{new Point(0,0),new Point(width -1,0),
                  new Point(width -1,height -1),new Point(0,height-1),new Point(0,0)};
            g.DrawLines(new Pen(Color.Black), ps);
        }

        #endregion

        #region Events
        /// <summary>
        /// 鼠标单击事件：用来显示边框
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void MouseClick(object sender, MouseEventArgs e)
        {
            if (IsSelected)//如果是已经选择的控件，则无需做操作
                return;
            if ((Control.ModifierKeys & Keys.Control) == Keys.Control)
            {
            }
            else
            {
                //清空所有边框控件
                foreach (var item in CurrList)
                    item.IsSelected = false;
                ClearFrameControl();
            }
            IsSelected = true;
            //this.currentControl.Parent.Refresh();//刷新父容器，清除掉其他控件的边框
            //this.currentControl.BringToFront();
            fc = new FrameControl(this.currentControl);
            this.currentControl.Parent.Controls.Add(fc);
            fc.Visible = true;
            fc.Draw();
        }
        public static void ClearAllControl()
        {
            if (CurrParent == null)
                return;
            for(int i=CurrList.Count-1;i>=0;i--)
            {
                CurrList[i].ClearControl();
            }
            CurrParent.Refresh();
        }
        //从链表中移除控件和边框，并从父控件上移除
        public void ClearControl()
        {
            //移除边框
            if(fc!=null)
            {
                CurrParent.Controls.Remove(fc);
                fc.Dispose();
            }
            CurrParent.Controls.Remove(currentControl);
            currentControl.Dispose();
            CurrList.Remove(this);
        }
        /// <summary>
        /// 清空所以后边框控件
        /// </summary>
        public static void ClearFrameControl()
        {
            //清空控件所有边框
            foreach (var item in CurrList)
            {
                if (item.fc != null)
                {
                    CurrParent.Controls.Remove(item.fc);
                    item.fc.Dispose();
                    item.fc = null;
                }
            }
            CurrParent.Refresh();
        }
        /// <summary>
        /// 给选中的控件添加边框
        /// </summary>
        public static void AddFrameControl()
        {
            ClearFrameControl();
            List<MoveControl> sels = FindSelControl();
            foreach(MoveControl item in sels)
            {
                item.fc = new FrameControl(item.currentControl);
                CurrParent.Controls.Add(item.fc);
                item.currentControl.BringToFront();
                item.fc.Visible = true;
                item.fc.Draw();
            }
            
        }
        public static List<MoveControl> FindSelControl()
        {
            List<MoveControl> sels = new List<MoveControl>();
            foreach (var item in CurrList)
            {
                if (item.IsSelected)
                    sels.Add(item);
            }
            return sels;
        }
        /// <summary>
        /// 鼠标按下事件：记录当前鼠标相对窗体的坐标
        /// </summary>
        void MouseDown(object sender, MouseEventArgs e)
        {
            pPoint = Cursor.Position;
            if(e.Button==MouseButtons.Right&&currMenu!=null)
            {
                currMenu.Tag = currentControl;
                System.Drawing.Point pointglobal = System.Windows.Forms.Control.MousePosition;
                currMenu.Show(pointglobal);
            }
            //if(e.Button==MouseButtons.Left)
            //{
            //    if (!IsSelected)
            //    {
            //        ClearFrameControl();
            //        IsSelected = true;
            //    }
            //}
        }

        /// <summary>
        /// 鼠标移动事件：让控件跟着鼠标移动
        /// </summary>
        void MouseMove(object sender, MouseEventArgs e)
        {
            Cursor.Current = Cursors.SizeAll; //当鼠标处于控件内部时，显示光标样式为SizeAll
                                              //当鼠标左键按下时才触发
            if (e.Button == MouseButtons.Left)
            {
                ClearFrameControl();
                if (!IsSelected)
                {
                    foreach (var item in CurrList)
                        item.IsSelected = false;
                    IsSelected = true;
                }
                cPoint = Cursor.Position;//获得当前鼠标位置
                int x = cPoint.X - pPoint.X;
                int y = cPoint.Y - pPoint.Y;
                List<MoveControl> templist = FindSelControl();
                foreach(var item in templist)
                {
                    MoveControl.DrawDragBound(item.currentControl);
                    if (item.fc != null)
                    {
                        //currentControl.Parent.Controls.Remove(item.fc);
                        item.fc.Visible = false;
                    }
                    item.currentControl.Location = new Point(item.currentControl.Location.X + x, item.currentControl.Location.Y + y);
                }
                pPoint = cPoint;
                
                //MoveControl.DrawDragBound(this.currentControl);
                //if (fc != null) fc.Visible = false; //先隐藏
                //cPoint = Cursor.Position;//获得当前鼠标位置
                //int x = cPoint.X - pPoint.X;
                //int y = cPoint.Y - pPoint.Y;
                //currentControl.Location = new Point(currentControl.Location.X + x, currentControl.Location.Y + y);
                //pPoint = cPoint;

            }
        }

        /// <summary>
        /// 鼠标弹起事件：让自定义的边框出现
        /// </summary>
        void MouseUp(object sender, MouseEventArgs e)
        {
            AddFrameControl();
            //currentControl.Parent.Refresh();
            //this.currentControl.Refresh();
            //if (fc != null)
            //{
            //    fc.Visible = true;
            //    fc.Draw();
            //}
        }

        public void Refresh()
        {
            this.currentControl.Refresh();
            if (fc != null)
            {
                fc.Visible = true;
                fc.Draw();
            }
        }
        #endregion
    }
}