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Dragging a form onto another in an MDI environment in C#

Posted on 2010-04-01
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Last Modified: 2012-06-27
Hi all,

Is it possible to detect when one Child form is dragged over a specific location of another child form in an MDI application? (Kind of drag-drop an entire form into another)

Any help would be appreciated.
Best regards,
James
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Question by:James Atkin
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Expert Comment

by:Mike Tomlinson
ID: 29380047
Sure...use the LocationChanged() event of the form.  You can compare positions by converting the child form point coords to screen coords with PointToScreen().
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Author Comment

by:James Atkin
ID: 29906690
Do you have any examples of the usage of this?
Thanks....
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Accepted Solution

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Mike Tomlinson earned 2000 total points
ID: 29920692
Really not sure what your setup is so here's a contrived example.  I have a main MdiParent form (Form1) and two MdiChildren (MdiChildA, MdiChildB).  In MdiChildB I placed a PictureBox (pictureBox1), made its border visible, and changed its Modifiers() Property to True so that the PictureBox would be visible outside the form class and accessible from the MdiParent.  I made MdiChildA smaller than the PictureBox in MdiChildB.

When the MdiParent opens the two children are displayed.  When MdiChildA is dragged completely into the PictureBox on MdiChildB you should get a MessageBox.  You could also check if the Cursor position is within the PictureBox or use the Intersects() method of the Rectangle to check for a hit instead of complete containment:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        private MdiChildA frmA;
        private MdiChildB frmB;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            frmA = new MdiChildA();
            frmA.MdiParent = this;
            frmA.Show();
            frmA.LocationChanged += new EventHandler(frmA_LocationChanged);

            frmB = new MdiChildB();
            frmB.MdiParent = this;
            frmB.Show();
        }

        void frmA_LocationChanged(object sender, EventArgs e)
        {
            Rectangle rc = frmB.pictureBox1.RectangleToScreen(frmB.pictureBox1.ClientRectangle);
            if (rc.Contains(this.RectangleToScreen(frmA.Bounds)))
            {
                MessageBox.Show("frmA dropped into frmB's pictureBox1");
            }
        }

    }
}

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Author Closing Comment

by:James Atkin
ID: 31710091
That works great! Thanks :-)
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