drawstring onclick method C#

Question

I have some strings that I have drawn using DrawString

        for (int j = 0; j < dt.Rows.Count; j++)
        {
            e.Graphics.DrawString(Convert.ToString(dt.Rows[j]["ID"]), drawFont, drawBrush, new Point(Convert.ToInt32(dt.Rows[j]["XCord"]), Convert.ToInt32(dt.Rows[j]["YCord"])));
        }

Is there any way to create an onclick event for each drawstring? I was hoping to create a new form when you clicked on the drawstring. Thanks!

Answer 1

Handle the MouseClick event of the container and enumerate through the rows to find out the "rectangle" of the text and see if the mouse location is inside it:

void panel1_MouseClick(object sender, MouseEventArgs e) {
  if (e.Button == MouseButtons.Left) {
    foreach (DataRow dr in dt.Rows) {
      Point p = new Point(Convert.ToInt32(dr["XCord"]), Convert.ToInt32(dr["YCord"]));
      Size s = TextRenderer.MeasureText(dr["ID"].ToString(), panel1.Font);
      if (new Rectangle(p, s).Contains(e.Location)) {
        MessageBox.Show("Clicked on " + dr["ID"].ToString());
      }
    }
  }
}

Answer 2

No. When you render things with Graphics you can not bind events to the drawn object.

There are two solutions, you could catch mouse clicks on the form (MouseClick event) and determine if the mouse is over a rendered string (getting the render area using MeasureString). This, however, is unnecessarily difficult and complex.

Instead, I recommended spawning a control dynamically on the form. You could spawn a Button or, if you like the style of just the text on the form, a Label and then bind an EventHandler to their MouseClick event.