Question

How do I detect if window is not visible to the user and then move it to a position that is visible to allow the user to size it to their liking.

The problem:-
I have a program that save the position and size of the form this works perfectly.
Unfortunately, many users now have multiple screen graphics cards that can be switched between duplicate and extended.

Therefore, if the user closes the form (the program saves where it was) and the user switches his system to say extended from duplicate then opens the program.
The program form is now not visible because it has moved off the limits of the current screen system 🙁
The user can see it running on the task bar. However clicking the icon only gives a brief flash of minimising or maximising the program and right clicking only has the option to close.

I need to trap for not visible to the user and then auto resize to any active window. The user can then resize/move as they see fit.

I would welcome any ideas/pointers

Answer 1

This answer was provided for the same question on the MSDN forums – essentially, it’s a quick check of the bounds of the screen, and checks to see if the program is within those bounds. If not, it moves it to 0, 0:

using System.Windows.Forms; 

class Form1 : Form {
    protected void EnsureVisible() {
        foreach (Screen scrn in Screen.AllScreens) {
        // You may prefer Intersects(), rather than Contains()
            if (scrn.Bounds.Contains(this.Bounds)) {
              return;
            }
        }
        this.Location = new Point( 0, 0 );
    }
}