The default SCREEN window
When the first interactive instruction is reached in a
Genero BDL program, a default window named SCREEN
is created.
The default SCREEN
window can be used to open one or more successive forms; it
can also be closed, with the CLOSE WINDOW SCREEN
instruction. If the default
SCREEN
window is not closed, and a new window is created with the OPEN
WINDOW
command, an empty default SCREEN
window will be displayed.
When writing a GUI application, you typically open the main form
in the
SCREEN
window, and display other forms
with the OPEN WINDOW
name WITH FORM
instruction:MAIN
DEFER INTERRUPT
OPTIONS INPUT WRAP
...
OPEN FORM f_main FROM "custfrm"
DISPLAY FORM f_main
...
END MAIN
The SCREEN
window is not visible in TUI mode because
program windows are rendered as simple boxes and SCREEN
is
created without borders. The size of the SCREEN
window
is 80x25 in TUI mode.