ComboBox show dropdown menu on text selection

Question

I want to show the list of items in a combo box when the user selects the text. I have a touch screen application and it's very difficult to hit the dropdown arrow so I figure I'd show the menu when the text is selected which is often what gets touched. I'm using VS 2008. and suggestions for a touch friendly numeric up down solution in VS2008?

Answer 1

You could use the ComboBox.Click event handler and the ComboBox.DroppedDown property and do something like this:

private void ComboBox1_Click(System.Object sender, System.EventArgs e)
{
    ComboBox1.DroppedDown = true;
}

You could also use the same event handler for a numericUpDown and use the mouseposition as well as the position and height of the NumericUpDown to get whether or not the click was above or below the halfway-line of the control by doing something like this (not sure if my math here is perfect, but it worked when I tested it):

if ((MousePosition.Y - this.PointToScreen(NumericUpDown1.Location).Y < NumericUpDown1.Height / 2)) 
{
    NumericUpDown1.Value += 1;
}
else 
{
    NumericUpDown1.Value -= 1;
}

HTH