/******************************************************************
 * 创 建 人：  SamWang
 * 创建时间：  2012-5-10 16:06
 * 描    述：
 *             移动控件但不改变大小
 * 原    理：
 * 版    本：  V1.0      
 * 环    境：  VS2010
******************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace DragControl
{
    public class MoveControl
    {
        #region Constructors
        public MoveControl(Control ctrl)
        {
            currentControl = ctrl;
            AddEvents();
        }
        #endregion

        #region Fields
        private 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
        FrameControl fc;//边框控件
        #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);
            currentControl.KeyDown += CurrentControl_KeyDown;
            //currentControl.KeyUp += CurrentControl_KeyUp;
        }

        private void CurrentControl_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Up)
            {
                foreach (Control ct in this.currentControl.Parent.Controls)
                {
                    if (ct is FrameControl)
                    {
                        ct.Top--;
                    }
                }
            }
            else if (e.KeyCode == Keys.Down)
            {
                foreach (Control ct in this.currentControl.Parent.Controls)
                {
                    if (ct is FrameControl)
                    {
                        ct.Top++;
                    }
                }
            }
            else if (e.KeyCode == Keys.Left)
            {
                foreach (Control ct in this.currentControl.Parent.Controls)
                {
                    if (ct is FrameControl)
                    {
                        ct.Left--;
                    }
                }
            }
            else if (e.KeyCode == Keys.Right)
            {
                foreach (Control ct in this.currentControl.Parent.Controls)
                {
                    if (ct is FrameControl)
                    {
                        ct.Left++;
                    }
                }
            }
        }

        private void CurrentControl_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Delete)
            {
                if (this.currentControl.Parent != null)
                {
                    this.currentControl.Parent.Refresh();//刷新父容器，清除掉其他控件的边框
                    foreach (Control ct in this.currentControl.Parent.Controls)
                    {
                        if (ct is FrameControl)
                        {
                            this.currentControl.Parent.Controls.Remove(ct);
                        }
                    }
                }
                if (fc != null) { fc.Dispose(); }
            }
        }

        public void CurrentControl_Disposed(object sender, EventArgs e)
        {

        }

        /// <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)
        {
            this.currentControl.Parent.Refresh();//刷新父容器，清除掉其他控件的边框
            this.currentControl.BringToFront();
            foreach (Control ct in this.currentControl.Parent.Controls)
            {
                if (ct is FrameControl)
                {
                    this.currentControl.Parent.Controls.Remove(ct);
                }
            }
            if (fc != null) { fc.Dispose(); }
            fc = new FrameControl(this.currentControl);
            this.currentControl.Parent.Controls.Add(fc);
            fc.Visible = true;
            fc.Draw();
        }

        /// <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;               
        }

        /// <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)
            {
                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);
                if (fc != null) fc.Location = currentControl.Location;
                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)
        {
            this.currentControl.Refresh();
            if (fc != null)
            {
                fc.Visible = true;
                fc.Draw();
            }
        }
        #endregion
    }
}