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copied!<p>I have a panel divided into 10 equal rows. Then I have markers (squares with the height == height of a row) which I want to be able to drag up and down, but a markers need to be exactly fitting into a row. A marker cannot be dragged in a position where it has a half in row 1 and the other half in row 2. Therefore the dragging must be in certain specific vertical positions. I need to drag only vertically. Then I need to assign the row were the markers has been moved to as a property of the object. E.g. if marker has been placed in row 5 then the rank of that object is to be assigned to 5. This is what i've done so far, I am able to drag each marker vertically, the problem is that they can be ragged outside the parent container and that I can't make them move only into the desired y Location. Any ideas or explanation of how I can achieve this... please feel free to ask if my question is not so clear.. Thank You.</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms; using System.Drawing; namespace MouseDragTest { class Marker : PictureBox { public Label lb1 = new Label(); public Label lb2 = new Label(); bool isDragging = false; int rank; //-------Constructor---------- public Marker(int xLoc, int yLoc) { Location = new Point(xLoc, yLoc); this.Size = new Size(20, 20); this.BackColor = Color.Blue; this.BringToFront(); //-------Mouse Event Handlers-------- this.MouseDown += new MouseEventHandler(StartDrag); this.MouseUp += new MouseEventHandler(StopDrag); this.MouseMove += new MouseEventHandler(OnDrag); } //-------Mouse Event Handlers Implementation--------- private void StartDrag(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { isDragging = true; rank = (this.Top + e.Y); } } private void StopDrag(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { isDragging = false; rank = this.Top + e.Y; lb1.Text = rank.ToString(); //Info on blue square lb2.Text = rank.ToString(); //Info on red square } } private void OnDrag(object sender, MouseEventArgs e) { if (isDragging) { this.Top = this.Top + e.Y; //move vertically; } } protected override void OnPaint(PaintEventArgs pe) { base.OnPaint(pe); } } } 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 MouseDragTest { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void panel1_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; Pen p = new Pen(Color.Black, 1); int yLoc = 20; for (int i = 0; i < 10; i++) { g.DrawLine(p, 0, yLoc, this.Width, yLoc);yLoc += 20; } } private void Form1_Load(object sender, EventArgs e) { Marker mk1 = new Marker(0, 0); panel1.Controls.Add(mk1); /*For testing*/ mk1.lb1 = label1; Marker mk2 = new Marker(20,0); panel1.Controls.Add(mk2); /*For testing*/ mk2.lb2 = label2; mk2.BackColor = Color.Red; } } } </code></pre>

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