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


namespace NewMyFormDesigner
{
    /// <summary>
    /// 设计面板
    /// </summary>
    public partial class DesignerControl : UserControl
    {
        public HostFrame _hostFrame; //所有控件的容器
        public Overlayer _overlayer;  //遮罩层

        bool MouseIsDown = false;
        Rectangle MouseRect = Rectangle.Empty;

        public DesignerControl()
        {
            InitializeComponent();
            _hostFrame = new HostFrame();
            _hostFrame.TopLevel = false;  //当做子控件添加到设计面板
            _hostFrame.Location = new Point(10, 10);
            _hostFrame.Text = "商品表单设计";
            Controls.Add(_hostFrame);
            _hostFrame.Show();
            _overlayer = new Overlayer(_hostFrame);
            _overlayer.Location = new Point(0, 0);
            _overlayer.Dock = DockStyle.Fill;
            Controls.Add(_overlayer);
            _overlayer.Show();
            _overlayer.BringToFront();  //将其设置Z轴最上，接受所有的用户操作，底层的其他控件无法接受用户输入。各位可以注释这条试一下，底层的其他控件（窗体）就能接受鼠标点击
            Application.AddMessageFilter(new MessageFilter(_hostFrame, this)); // 过滤控件容器中所有子控件的WM_PAINT消息 减少重绘操作
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);

            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);
        }

        public DesignerControl(int Width, int Height)
        {
            _hostFrame = new HostFrame();
            _hostFrame.TopLevel = false;  //当做子控件添加到设计面板
            _hostFrame.Location = new Point(10, 10);
            _hostFrame.Height = Height;
            _hostFrame.Width = Width;
            _hostFrame.Text = "表单设计";
            Controls.Add(_hostFrame);
            _hostFrame.Show();

            _overlayer = new Overlayer(_hostFrame);
            _overlayer.Location = new Point(0, 0);
            _overlayer.Dock = DockStyle.Fill;
            Controls.Add(_overlayer);
            _overlayer.Show();
            _overlayer.BringToFront();  //将其设置Z轴最上，接受所有的用户操作，底层的其他控件无法接受用户输入。各位可以注释这条试一下，底层的其他控件（窗体）就能接受鼠标点击
            Application.AddMessageFilter(new MessageFilter(_hostFrame, this)); // 过滤控件容器中所有子控件的WM_PAINT消息 减少重绘操作
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);

            this.MouseDown += new MouseEventHandler(frmMain_MouseDown);
            this.MouseMove += new MouseEventHandler(frmMain_MouseMove);
            this.MouseUp += new MouseEventHandler(frmMain_MouseUp);
        }
        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            return base.ProcessCmdKey(ref msg, keyData);
        }
    }
}