C# Add Control To Panel

[창공]

https://youtu.be/MjciVKubIXY

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace SampleCode

{

    public partial class AddControlToPanel : Form

    {

        public AddControlToPanel()

        {

            InitializeComponent();

        }

        private void AddControlToPanel_Load(object sender, EventArgs e)

        {

            comboBox1.SelectedIndex = 0;

        }

        private void button1_Click(object sender, EventArgs e)

        {

/*

            // method 1

            if(comboBox1.Text == "Label")

            {

                Label label = new Label();

                label.BackColor = Color.White;

                label.Text = comboBox1.Text;

                panel1.Controls.Add(label);

                label.BringToFront();

                label.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Control_MouseDown);

                label.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Control_MouseMove);                                               

            }

            else if(comboBox1.Text == "Button")

            {

                Button button = new Button();

                button.BackColor = Color.White;

                button.Text = comboBox1.Text;

                panel1.Controls.Add(button);

                button.BringToFront();

                button.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Control_MouseDown);

                button.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Control_MouseMove);                                               

            }

*/

/*

            // method 2

            Control control = new Control();

            if(comboBox1.Text == "Label")

                control = new Label();

            else if(comboBox1.Text == "Button")

                control = new Button();

            else if(comboBox1.Text == "RadioButton")

                control = new RadioButton();

            else if(comboBox1.Text == "CheckBox")

                control = new CheckBox();

            else if(comboBox1.Text == "ComboBox")

                control = new ComboBox();

            else if(comboBox1.Text == "GroupBox")

                control = new GroupBox();

            else if(comboBox1.Text == "Panel")

                control = new Panel();

            else if(comboBox1.Text == "PictureBox")

                control = new PictureBox();

            else if(comboBox1.Text == "ListBox")

                control = new ListBox();

            control.BackColor = Color.White;

            control.Text = comboBox1.Text;

            panel1.Controls.Add(control);

            control.BringToFront();

            control.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Control_MouseDown);

            control.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Control_MouseMove);                                               

*/

            // Note that if you're using a strongly named assembly (like Form in this case)

            // you must include all the assembly information - versioning, public key token etc.

            // method 3

            string typeName = $"System.Windows.Forms.{comboBox1.Text}, System.Windows.Forms, "

                    + "Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";

            Type conType = Type.GetType(typeName);

            if(conType==null)

            {

                MessageBox.Show($"Type Invalid {comboBox1.Text}");

                return ;

            }

            Control control = (Control)Activator.CreateInstance(conType);

            control.BackColor = Color.White;

            control.Text = comboBox1.Text;

            panel1.Controls.Add(control);

            control.BringToFront();

            control.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Control_MouseDown);

            control.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Control_MouseMove);                                               

        }

        Point mousePoint ;

        Size controlSize ;

        private void Control_MouseDown(object sender, MouseEventArgs e)

        {

            Control con = sender as Control;

            mousePoint = new Point(e.X, e.Y);

            controlSize = con.Size;

        }

        private void Control_MouseMove(object sender, MouseEventArgs e)

        {

            Control con = sender as Control;

            int xDiff = con.Size.Width - e.X;

            int yDiff = con.Size.Height - e.Y;

            if(xDiff<20 && yDiff<20)

            {

                Cursor.Current = Cursors.SizeNWSE;

            }

            if( (e.Button&MouseButtons.Left)!=MouseButtons.Left) return ;

            if(xDiff<20 && yDiff<20)

            {

                con.Size = new Size(controlSize.Width - (mousePoint.X-e.X), 

                    controlSize.Height - (mousePoint.Y-e.Y));

                return ;

            }

            con.Location = new Point(con.Left - (mousePoint.X-e.X),

                con.Top - (mousePoint.Y-e.Y));

        }

    }

}