C# Custom display arrangement settings

Question

So I am trying to make a little utility for managing my screens, I want to add a screen rearrangement system like in windows, see here: ,

I already have code worked out for getting and setting the exact screen coordinates I need, however I need to work out some sort of rearrangement dragging system that "snaps" to position like the windows implementation.

so far I have made some basic strides towards this, before coming to the realization the snapping will be a bit challenging, so here is the code I have so far, and here is an attached screenshot of the program as is. It consists of a panel with 3 panels inside it. For now I would like tips on when the mouse is released and the collision checks are run to snap similarly to windows display rearangment, Just a test bed for now

current code:

   private Point MouseDownLocation;  
private void panel2_MouseMove(object sender, MouseEventArgs e)  
{  
     var pan = (Panel)sender;  
     if (e.Button == System.Windows.Forms.MouseButtons.Left)  
     {  
          pan.Left = e.X + pan.Left - MouseDownLocation.X;  
          pan.Top = e.Y + pan.Top - MouseDownLocation.Y;  
     }  
}  
  
        private void panel2_MouseUp(object sender, MouseEventArgs e)  
        {  
            if (e.Button == MouseButtons.Left)  
            {  
                var pan = (Panel)sender;  
                List<Panel> allpanels = new List<Panel>();  
                foreach (Panel pancomp in panel1.Controls)  
                {  
                    if (pancomp == pan)  
                    {  
                        continue;  
                    }        
                    allpanels.Add(pancomp);  
                }  
  
  
                //var pan = (Panel)sender;  
                List<Panel> collisions = new List<Panel>();  
  
                foreach (Panel pancomp in allpanels)  
                {  
                    if (pancomp == pan)  
                    {  
                        continue;  
                    }  
  
                    if (pan.Bounds.IntersectsWith(pancomp.Bounds))  
                    {  
                        //PUSH AWAY  
                        collisions.Add(pancomp);  
                        //listBox1.Items.Add("collided!");//panel2.Location.ToString());  
                    }  
                }  
  
                collisions = collisions;  
  
                if (collisions.Count > 0)  
                {  
                    //WE HAVE COLLISIONS LETS SNAP TO VALID PLACE  
                    //MouseDownLocation  
  
  
  
                }  
                else  
                {  
                    //WE HAVE NO COLLISIONS LETS SNAP TO PLACE  
                }  
  
  
            }  
        }  
  
        private void panel2_MouseDown(object sender, MouseEventArgs e)  
        {  
            if (e.Button == System.Windows.Forms.MouseButtons.Left)  
            {  
                MouseDownLocation = e.Location;  
            }  
        }  

Answer 1

@James , Based on my test, I make a sample code for you to check the collision for three panels.

Code:

   private Point MouseDownLocation;  
    private void panel2_MouseMove(object sender, MouseEventArgs e)  
    {  
        var pan = (Panel)sender;  

        if (e.Button == System.Windows.Forms.MouseButtons.Left)  
        {  
            pan.Left = e.X + pan.Left - MouseDownLocation.X;  
            pan.Top = e.Y + pan.Top - MouseDownLocation.Y;  
            if (pan.Left <= panel1.Right && pan.Bottom > panel1.Top && panel1.Bottom > pan.Bottom && pan.Right > panel1.Right)  
            {  
                pan.Left = panel1.Right;  
  
            }  

        }  
          
         
    }  

Result:

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