갤러리정

Fake Drag And Drop

/*
User  Interfaces  in  C#:  Windows  Forms  and  Custom  Controls
by  Matthew  MacDonald

Publisher:  Apress
ISBN:  1590590457
*/

using  System;
using  System.Drawing;
using  System.Collections;
using  System.ComponentModel;
using  System.Windows.Forms;
using  System.Data;

namespace  FakeDragAndDrop
{
    ///  <summary>
    ///  Summary  description  for  FakeDragAndDrop.
    ///  </summary>
    public  class  FakeDragAndDrop  :  System.Windows.Forms.Form
    {
        internal  System.Windows.Forms.Label  lblDragger;
        ///  <summary>
        ///  Required  designer  variable.
        ///  </summary>
        private  System.ComponentModel.Container  components  =  null;

        public  FakeDragAndDrop()
        {
            //
            //  Required  for  Windows  Form  Designer  support
            //
            InitializeComponent();

            //
            //  TODO:  Add  any  constructor  code  after  InitializeComponent  call
            //
        }

        ///  <summary>
        ///  Clean  up  any  resources  being  used.
        ///  </summary>
        protected  override  void  Dispose(  bool  disposing  )
        {
            if(  disposing  )
            {
                if  (components  !=  null)  
                {
                    components.Dispose();
                }
            }
            base.Dispose(  disposing  );
        }

        #region  Windows  Form  Designer  generated  code
        ///  <summary>
        ///  Required  method  for  Designer  support  -  do  not  modify
        ///  the  contents  of  this  method  with  the  code  editor.
        ///  </summary>
        private  void  InitializeComponent()
        {
            System.Resources.ResourceManager  resources  =  new  System.Resources.ResourceManager(typeof(FakeDragAndDrop));
            this.lblDragger  =  new  System.Windows.Forms.Label();
            this.SuspendLayout();
            //  
            //  lblDragger
            //  
            this.lblDragger.BorderStyle  =  System.Windows.Forms.BorderStyle.Fixed3D;
            this.lblDragger.Image  =  ((System.Drawing.Bitmap)(resources.GetObject("lblDragger.Image")));
            this.lblDragger.Location  =  new  System.Drawing.Point(110,  105);
            this.lblDragger.Name  =  "lblDragger";
            this.lblDragger.Size  =  new  System.Drawing.Size(72,  56);
            this.lblDragger.TabIndex  =  2;
            this.lblDragger.MouseUp  +=  new  System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseUp);
            this.lblDragger.MouseMove  +=  new  System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseMove);
            this.lblDragger.MouseDown  +=  new  System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseDown);
            //  
            //  FakeDragAndDrop
            //  
            this.AutoScaleBaseSize  =  new  System.Drawing.Size(5,  13);
            this.ClientSize  =  new  System.Drawing.Size(292,  266);
            this.Controls.AddRange(new  System.Windows.Forms.Control[]  {
                                                                            this.lblDragger});
            this.Name  =  "FakeDragAndDrop";
            this.Text  =  "Fake  Drag  And  Drop";
            this.ResumeLayout(false);

        }
        #endregion

        ///  <summary>
        ///  The  main  entry  point  for  the  application.
        ///  </summary>
        [STAThread]
        static  void  Main()  
        {
            Application.Run(new  FakeDragAndDrop());
        }

        //  Keep  track  of  when  fake  "drag  and  drop"  mode  is  enabled.
        private  bool  isDragging  =  false;

        //  Store  the  location  where  the  user  clicked  the  control.
        private  int  clickOffsetX,  clickOffsetY;

        //  Start  dragging.
        private  void  lblDragger_MouseDown(System.Object  sender,
            System.Windows.Forms.MouseEventArgs  e)
        {
            isDragging  =  true;
            clickOffsetX  =  e.X;
            clickOffsetY  =  e.Y;
        }

        //  End  dragging.
        private  void  lblDragger_MouseUp(System.Object  sender,
            System.Windows.Forms.MouseEventArgs  e)
        {
            isDragging  =  false;
        }

        //  Move  the  control  (during  dragging).
        private  void  lblDragger_MouseMove(System.Object  sender,
            System.Windows.Forms.MouseEventArgs  e)
        {
            if  (isDragging  ==  true)
            {
                //  The  control  coordinates  are  converted  into  form  coordinates
                //  by  adding  the  label  position  offset.
                //  The  offset  where  the  user  clicked  in  the  control  is  also
                //  accounted  for.  Otherwise,  it  looks  like  the  top-left  corner
                //  of  the  label  is  attached  to  the  mouse.
                lblDragger.Left  =  e.X  +  lblDragger.Left  -  clickOffsetX;
                lblDragger.Top  =  e.Y  +  lblDragger.Top  -  clickOffsetY;
            }
        }

    }
}