C#

<br />
public partial class Form1 : Form<br />
{<br />
private Point startLoc = new Point(0, 0);<br />
private Point actLoc;<br />
private Point posScreen;<br />
private bool dragging = false;<br />
private Button draggedObject;<br />
<br />
public Form1()<br />
{<br />
InitializeComponent();<br />
<br />
panel1.AutoScroll = true;<br />
panel1.HorizontalScroll.Enabled = true;<br />
panel1.VerticalScroll.Enabled = true;<br />
<br />
button1.MouseMove += new MouseEventHandler(Object_MouseMove);<br />
button1.MouseDown += new MouseEventHandler(Object_MouseDown);<br />
button1.MouseUp += new MouseEventHandler(Object_MouseUp);<br />
}<br />
<br />
private void Object_MouseDown(Object sender, MouseEventArgs e)<br />
{<br />
if (e.Button == MouseButtons.Left &&<br />
sender.GetType() == typeof(Button))<br />
{<br />
Button visObj = (Button)sender;<br />
<br />
posScreen = visObj.PointToScreen(e.Location);<br />
startLoc = visObj.Location;<br />
draggedObject = visObj;<br />
dragging = true;<br />
}<br />
}<br />
<br />
<br />
private void Object_MouseMove(Object sender, MouseEventArgs e)<br />
{<br />
if (dragging == true)<br />
{<br />
Button visObj = (Button)sender;<br />
<br />
int deltaX = MousePosition.X - posScreen.X;<br />
int deltaY = MousePosition.Y - posScreen.Y;<br />
<br />
actLoc.X = startLoc.X + deltaX;<br />
actLoc.Y = startLoc.Y + deltaY;<br />
if (actLoc.X >= 0)<br />
{<br />
int horVal = this.HorizontalScroll.Value;<br />
int left;<br />
int rightObj = actLoc.X + visObj.Width;<br />
if (rightObj >= this.Width)<br />
{<br />
left = actLoc.X;// +actTabPage.AutoScrollPosition.X;<br />
}<br />
else<br />
{<br />
left = actLoc.X - this.AutoScrollPosition.X;<br />
}<br />
<br />
visObj.Left = left;<br />
}<br />
else<br />
{<br />
visObj.Left = 0;<br />
}<br />
<br />
if (actLoc.Y >= 0)<br />
{<br />
int top = actLoc.Y;// -actTabPage.AutoScrollOffset.Y;<br />
visObj.Top = top;<br />
<br />
}<br />
else<br />
{<br />
visObj.Top = 0;<br />
}<br />
<br />
}<br />
}<br />
<br />
private void Object_MouseUp(Object sender, MouseEventArgs e)<br />
{<br />
dragging = false;<br />
}<br />
}<br />