Determining if a form is completely off screen

Question

I am developing an application that remembers the user's preferences as to where the form was last located on the screen. In some instances the user will have it on a secondary screen, and then fire the app up later without the second screen (sometimes having the form appear off screen). Other times the user will change their resolution resulting in a similar effect.

I was hoping to do this checking in the Form_Shown event handler. Basically I want to determine whether the form is completely off screen so I can re-position it.

Any advice?

Answer 1

Check with this function if Form is fully on screen:

public bool IsOnScreen( Form form ) {    Screen[] screens = Screen.AllScreens;    foreach( Screen screen in screens )    {       Rectangle formRectangle = new Rectangle( form.Left, form.Top,                                                 form.Width, form.Height );        if( screen.WorkingArea.Contains( formRectangle ) )       {          return true;       }    }     return false; } 

Checking only top left point if it's on screen:

public bool IsOnScreen( Form form ) {    Screen[] screens = Screen.AllScreens;    foreach( Screen screen in screens )    {       Point formTopLeft = new Point( form.Left, form.Top );        if( screen.WorkingArea.Contains( formTopLeft ) )       {          return true;       }    }     return false; }