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


namespace NewMyFormDesigner
{
    public partial class HostFrame : Form
    {
        bool MouseIsDown = false;
        Rectangle MouseRect = Rectangle.Empty;

        public HostFrame()
        {
            InitializeComponent();

            this.MouseDown += new MouseEventHandler(frmMain_MouseDown);
            this.MouseMove += new MouseEventHandler(frmMain_MouseMove);
            this.MouseUp += new MouseEventHandler(frmMain_MouseUp);
        }

        void frmMain_MouseUp(object sender, MouseEventArgs e)
        {
            this.Capture = false;
            Cursor.Clip = Rectangle.Empty;
            MouseIsDown = false;
            DrawRectangle();

            foreach (Control ct in this.Controls)
            {
                // Point ctrlCenter = new Point(ct.Location.X + ct.Width / 2, ct.Location.Y + ct.Height / 2);

                //if (ctrlCenter.X > MouseRect.Location.X
                //    && ctrlCenter.X  < MouseRect.Location.X + MouseRect.Width
                //    && ctrlCenter.Y > MouseRect.Location.Y && ctrlCenter.Y > MouseRect.Location.Y + MouseRect.Height)
                if (MouseRect.Contains(ct.Location))
                {
                    if (ct is CheckBox)
                    {
                        if (((CheckBox)ct).Checked) //值选中
                        {
                            ((CheckBox)ct).Checked = false;
                        }
                        else
                        {
                            ((CheckBox)ct).Checked = true;
                        }
                        //控件选中 

                    }
                }
            }

            MouseRect = Rectangle.Empty;
        }
        void frmMain_MouseMove(object sender, MouseEventArgs e)
        {
            
            if (MouseIsDown)
                ResizeToRectangle(e.Location);
        }
        void frmMain_MouseDown(object sender, MouseEventArgs e)
        {
            MouseIsDown = true;
            DrawStart(e.Location);
           
        }
        private void ResizeToRectangle(Point p)
        {
            DrawRectangle();
            MouseRect.Width = p.X - MouseRect.Left;
            MouseRect.Height = p.Y - MouseRect.Top;
            DrawRectangle();
        }
        private void DrawRectangle()
        {
            Rectangle rect = this.RectangleToScreen(MouseRect);
            ControlPaint.DrawReversibleFrame(rect, Color.White, FrameStyle.Dashed);
        }
        private void DrawStart(Point StartPoint)
        {
            this.Capture = true;
            Cursor.Clip = this.RectangleToScreen(new Rectangle(0, 0, ClientSize.Width, ClientSize.Height));
            MouseRect = new Rectangle(StartPoint.X, StartPoint.Y, 0, 0);
        }
    }
}