Trecius wrote:
Hello, Newsgroupians:
I've been looking on the Internet for some resources to create a simple
drag-and-drop application, but they all seem too complicated or not what I
need.
Here are some simple explanations:
http://tinyurl.com/yeb6am http://tinyurl.com/2k7zo2
>
I have created a Form with a ToolStrip that has a couple of buttons at the
top. What I want to do is allow the user to drag one of the button's from
the toolstrip to the client area. Once the user let's go, I want to create a
button in the client area at that point. This mimics Visual Studio when
visually creating Forms. Does anyone have any short code or resources that
could allow me to do this?
Here's some sample code:
using System.Windows.Forms;
using System.Drawing;
using System;
namespace WindowsApplication5
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
newToolStripButton.MouseDown += newToolStripButton_MouseDown;
newToolStripButton.MouseUp += newToolStripButton_MouseUp;
newToolStripButton.MouseMove += newToolStripButton_MouseMove;
newToolStripButton.MouseLeave += newToolStripButton_MouseLeave;
AllowDrop = true;// just for demo purposes :-)
}
void newToolStripButton_MouseLeave(object sender, EventArgs e)
{
isDragging = false;
}
void newToolStripButton_MouseMove(object sender, MouseEventArgs e)
{
if(!isDragging)
return;
Size dragSize = SystemInformation.DragSize;
int dx = Math.Abs(dragPoint.X - e.X);
int dy = Math.Abs(dragPoint.Y - e.Y);
if(dx < dragSize.Width || dy < dragSize.Height)
return;
IDataObject data = new DataObject();
data.SetData(newToolStripButton);// D&D data
DragDropEffects res = DoDragDrop(data, DragDropEffects.All
| DragDropEffects.Link);
}
void newToolStripButton_MouseUp(object sender, MouseEventArgs e)
{
isDragging = false;
}
void newToolStripButton_MouseDown(object sender, MouseEventArgs e)
{
isDragging = true;
dragPoint = new Point(e.X, e.Y);
}
private bool isDragging = false;
private Point dragPoint = new Point();
protected override void OnDragOver(DragEventArgs drgevent)
{
if (drgevent.Data.GetDataPresent(typeof(ToolStripButt on)))
drgevent.Effect = DragDropEffects.Link;
}
protected override void OnDragDrop(DragEventArgs drgevent)
{
if (!drgevent.Data.GetDataPresent(typeof(ToolStripBut ton)))
return;
MessageBox.Show(((ToolStripButton)
drgevent.Data.GetData(typeof (ToolStripButton))).Text);
}
}
}
HTH,
Andy
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