using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace DragNDrop
{
public partial class Form1 : Form
{
//private members
private MultiPictureBox m_pic1;
private MultiPictureBox m_pic2;
private bool m_isMaximized = true;
private int m_SendingBox;
public Form1()
{
InitializeComponent();
//initialize the controls
m_pic1 = new MultiPictureBox();
m_pic1.AllowDrop = true;
m_pic1.BackColor = Color.White;
m_pic1.Location = new Point(10, 10);
m_pic1.Size = new Size(300, this.ClientSize.Height - 20);
m_pic2 = new MultiPictureBox();
m_pic2.AllowDrop = true;
m_pic2.BackColor = Color.White;
m_pic2.Location = new Point(this.ClientSize.Width - (m_pic1.Width + 10), 10);
m_pic2.Size = new Size(300, this.ClientSize.Height - 20);
this.Controls.Add(m_pic1);
this.Controls.Add(m_pic2);
//events
this.SizeChanged += new EventHandler(Form1_SizeChanged);
m_pic1.DragDrop += new DragEventHandler(m_pic_DragDrop);
m_pic1.DragEnter += new DragEventHandler(m_pic_DragEnter);
m_pic1.MouseDown += new MouseEventHandler(m_pic_MouseDown);
m_pic2.DragDrop += new DragEventHandler(m_pic_DragDrop);
m_pic2.DragEnter += new DragEventHandler(m_pic_DragEnter);
m_pic2.MouseDown += new MouseEventHandler(m_pic_MouseDown);
ImageWithBounds Pic1Blue;
ImageWithBounds Pic2Red;
ImageWithBounds Pic3Yellow;
Rectangle rectInnerBounds = new Rectangle(new Point(10, 10), new Size(20, 20));
for (int i = 0; i < 3; i++)
{
switch (i)
{
case 0:
Pic1Blue = new ImageWithBounds();
Pic1Blue.pImage = Image.FromFile("C:\\Documents and Settings\\twerner\\My Documents\\My Pictures\\icons_win\\blau_butterfly_win.ico");
Pic1Blue.pName = "blue";
Pic1Blue.pBounds = rectInnerBounds;
m_pic1.pImages.Add(Pic1Blue);
break;
case 1:
Pic2Red = new ImageWithBounds();
Pic2Red.pImage = Image.FromFile("C:\\Documents and Settings\\twerner\\My Documents\\My Pictures\\icons_win\\rot_butterfly_win.ico");
Pic2Red.pName = "red";
rectInnerBounds.Y = rectInnerBounds.Y + 100;
Pic2Red.pBounds = rectInnerBounds;
m_pic1.pImages.Add(Pic2Red);
break;
case 2:
Pic3Yellow = new ImageWithBounds();
Pic3Yellow.pImage = Image.FromFile("C:\\Documents and Settings\\twerner\\My Documents\\My Pictures\\icons_win\\gelb_butterfly_win.ico");
Pic3Yellow.pName = "yellow";
rectInnerBounds.Y = rectInnerBounds.Y + 100;
Pic3Yellow.pBounds = rectInnerBounds;
m_pic1.pImages.Add(Pic3Yellow);
break;
}
}
}
void m_pic_DragDrop(object sender, DragEventArgs e)
{
MultiPictureBox pic = (MultiPictureBox)sender;
if (pic == m_pic2 && m_SendingBox == 1)
{
m_pic2.pImages.Add((ImageWithBounds)e.Data.GetData(typeof(ImageWithBounds)));
m_pic1.pImages.Remove((ImageWithBounds)e.Data.GetData(typeof(ImageWithBounds)));
}
else
{
m_pic1.pImages.Add((ImageWithBounds)e.Data.GetData(typeof(ImageWithBounds)));
m_pic2.pImages.Remove((ImageWithBounds)e.Data.GetData(typeof(ImageWithBounds)));
}
}
void m_pic_MouseDown(object sender, MouseEventArgs e)
{
MultiPictureBox pic = (MultiPictureBox)sender;
Point pt = new Point(e.Location.X, e.Location.Y);
//is needed, in order to store, which is the target box
if (pic == m_pic1)
{
m_SendingBox = 1;
}
else
{
m_SendingBox = 2;
}
foreach (ImageWithBounds item in pic.pImages)
{
switch (item.pName)
{
case "blue":
if ((pt.X >= item.pBounds.X && pt.X <= item.pBounds.X + item.pBounds.Width)
&& (pt.Y >= item.pBounds.Y && pt.Y <= item.pBounds.Y +
item.pBounds.Height))
{
//cursor hits the blue image
pic.DoDragDrop(item, DragDropEffects.Move);
return;
}
break;
case "red":
if ((pt.X >= item.pBounds.X && pt.X <= item.pBounds.X + item.pBounds.Width)
&& (pt.Y >= item.pBounds.Y && pt.Y <= item.pBounds.Y +
item.pBounds.Height))
{
//cursor hits the red image
pic.DoDragDrop(item, DragDropEffects.Move);
return;
}
break;
case "yellow":
if ((pt.X >= item.pBounds.X && pt.X <= item.pBounds.X + item.pBounds.Width)
&& (pt.Y >= item.pBounds.Y && pt.Y <= item.pBounds.Y +
item.pBounds.Height))
{
//cursor hits the yellow image
pic.DoDragDrop(item, DragDropEffects.Move);
return;
}
break;
}
}
}
void m_pic_DragEnter(object sender, DragEventArgs e)
{
if ((MultiPictureBox)sender == m_pic2 && m_SendingBox == 1)
{
if (e.Data.GetDataPresent(typeof(ImageWithBounds)))
{
e.Effect = DragDropEffects.Move;
}
}
else if((MultiPictureBox)sender == m_pic1 && m_SendingBox == 2)
{
if (e.Data.GetDataPresent(typeof(ImageWithBounds)))
{
e.Effect = DragDropEffects.Move;
}
}
}
void Form1_SizeChanged(object sender, EventArgs e)
{
//redraw the controls if the size of the form has changed
if (m_isMaximized)
{
m_isMaximized = false;
m_pic1.Location = new Point(10, 10);
m_pic1.Size = new Size(500, this.ClientSize.Height - 20);
m_pic2.Location = new Point(this.ClientSize.Width - (m_pic1.Width + 10), 10);
m_pic2.Size = new Size(500, this.ClientSize.Height - 20);
}
else
{
m_isMaximized = true;
m_pic1.Location = new Point(10, 10);
m_pic1.Size = new Size(300, this.ClientSize.Height - 20);
m_pic2.Location = new Point(this.ClientSize.Width - (m_pic1.Width + 10), 10);
m_pic2.Size = new Size(300, this.ClientSize.Height - 20);
}
}
}
public class MultiPictureBox : Control
{
//the collection, which is used to store our images
private ImageWithBoundsCollection m_Images = new ImageWithBoundsCollection();
//read-only access to the images collection
public ImageWithBoundsCollection pImages
{
get { return m_Images; }
}
//to display the picture name or not
private bool m_bShowNames = false;
public bool pbShowNames
{
get { return m_bShowNames; }
set
{
m_bShowNames = value;
OnShowNamesChanged(EventArgs.Empty);
}
}
public MultiPictureBox()
{
//called, if the count of the image collection has changed
m_Images.CollectionChanged += new EventHandler(m_Images_CollectionChanged);
}
void m_Images_CollectionChanged(object sender, EventArgs e)
{
//the count of images has changed, so we have to redraw the control
Invalidate();
}
#region Overridden functions
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
//draw the images in the multipicture box
foreach (ImageWithBounds image in m_Images)
{
if (image.pImage == null)
continue;
e.Graphics.DrawImage(image.pImage, image.pBounds);
if (m_bShowNames && !string.IsNullOrEmpty(image.pName))
{
e.Graphics.DrawString(image.pName, SystemFonts.DefaultFont, Brushes.Black,
new PointF(image.pBounds.X, image.pBounds.Y + image.pBounds.Height));
}
}
}
#endregion
protected virtual void OnShowNamesChanged(EventArgs e)
{
Invalidate();
EventHandler handler = ShowNamesChanged;
if (handler != null)
handler(this, e);
}
public event EventHandler ShowNamesChanged;
}
//this class store an image object
public class ImageWithBounds
{
private string m_Name;
public string pName
{
get { return m_Name; }
set { m_Name = value; }
}
private Image m_Image;
public Image pImage
{
get { return m_Image; }
set { m_Image = value; }
}
private Rectangle m_Bounds;
public Rectangle pBounds
{
get { return m_Bounds; }
set
{
m_Bounds = value;
}
}
}
//the collection, which stores the images of the control
public class ImageWithBoundsCollection : KeyedCollection<string, ImageWithBounds>
{
protected override string GetKeyForItem(ImageWithBounds item)
{
return item.pName;
}
protected override void InsertItem(int index, ImageWithBounds item)
{
base.InsertItem(index, item);
OnCollectionChanged(EventArgs.Empty);
}
protected override void RemoveItem(int index)
{
base.RemoveItem(index);
OnCollectionChanged(EventArgs.Empty);
}
protected virtual void OnCollectionChanged(EventArgs e)
{
EventHandler handler = CollectionChanged;
if (handler != null)
handler(this, e);
}
public event EventHandler CollectionChanged;
}
}
Hätte ich mir auch denken können. Aber du kannst die PictureBox beispielsweise durch einen Panel austauschen. Dann geht es einwandfrei. Und das Image kannst du ja trotzdem wieder reinladen, ist ja kein Problem.
