Combobox dropdown open-close on mousehover C# winforms

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How to Load dropdown list while cursor reaches the combobox and close while cursor leaves the combobox?

What I have tried:

private void comboBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (!comboBox1.ClientRectangle.Contains(e.Location))
                comboBox1.Capture = false;
            else if (comboBox1.Capture == false)
            {
                comboBox1.DroppedDown = true;
                //timer1.Interval = 1000;
                timer1.Start();
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            Point MP = new Point(Cursor.Position.X - this.Location.X, Cursor.Position.Y - this.Location.Y);
            Size DDS = new Size(comboBox1.DropDownWidth, comboBox1.DropDownHeight + comboBox1.Height);
            Rectangle DDR = new Rectangle(comboBox1.Left, comboBox1.Top, comboBox1.DropDownWidth, comboBox1.DropDownHeight * 2 + comboBox1.Height-20);
           

            if (!DDR.Contains(MP))
            {
                comboBox1.DroppedDown = false;
                timer1.Stop();
            }

            label1.Text = MP.ToString();
            label2.Text = DDR.ToString();
            label3.Text = comboBox1.Location.ToString() + "\n" + comboBox1.Size.ToString() ;
        }

Posted 27-Apr-16 22:59pm

Kishan Sojitra

Updated 28-Apr-16 2:54am

HobbyProggy

v3

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Comments

HobbyProggy 28-Apr-16 5:52am

Instead of the MouseMove you should use the MouseHover and there you just set the combobox on DroppedDown = true;

Then your combobox opens properly.

VR Karthikeyan 28-Apr-16 6:16am

Add you comment as answer.

HobbyProggy 28-Apr-16 7:44am

It's not complete though.

1 solution

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Karthik_Mahalingam · Answer 1 · 2016-04-28T02:54:00

Try this, working.

C#

private void comboBox1_MouseLeave(object sender, EventArgs e)
      {
          comboBox1.DroppedDown = false;
      }

      private void comboBox1_MouseMove(object sender, MouseEventArgs e)
      {
          comboBox1.DroppedDown = true;
      }

Idea from HobbyProggy [^], from the comments.