Question

I need to determine if the value of a NumericUpDown control was changed by a mouseUp event.

I need to call an expensive function when the value of a numericupdown has changed. I can’t just use “ValueChanged”, I need to use MouseUp and KeyUp events.

Basically, I need to know:

Did the value of the numericUpDown change when the user let go of the
mouse? If any area which is not highlighted in red is clicked, the
answer is no. I need to IGNORE the mouse up event, when ANYWHERE but the red area is clicked.

How can I determine this by code? I find events a little confusing.

Answer 1

This will fire when the user releases the mouse button. You might want to investigate which mousebutton was released.

EDIT

    decimal numvalue = 0;
    private void numericUpDown1_MouseUp(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left && numvalue != numericUpDown1.Value)
        {
            //expensive routines
            MessageBox.Show(numericUpDown1.Value.ToString());
        }

        numvalue = numericUpDown1.Value;
    }

EDIT 2
This will determine if the left mousebutton is still down, if it is exit before performing expensive routine, doesn’t help with keyboard button down.

    private void numericUpDown1_ValueChanged(object sender, EventArgs e)
    {
        if ((Control.MouseButtons & MouseButtons.Left) == MouseButtons.Left)
        {
            return;
        }
        //expensive routines


    }

Edit 3

How to detect the currently pressed key?

Will help solve the Any key down, Though I think the only ones that matter are the arrow keys