listbox .lb -width 30
pack .lb
..lb insert 1 "Element 1"
..lb insert 2 "Element 2"
..lb insert 3 "Element 3"

proc handleSelection {s T} {
# Greife auf den aktuellen Text des ausgewählten Elements in der Listbox zu
set selectedIndex [.lb curselection]
if {$selectedIndex ne ""} {
set selectedText [.lb get $selectedIndex]
# Gib das ausgewählte Element und den Ereignistyp in der Konsole aus
puts "eventState: $s"
puts "eventType: $T <- [lindex [event info] $T]"
puts "Ausgewähltes Element: $selectedText"
}
} bind .lb <<ListboxSelect>> [list handleSelection %W %s %T]

================
eventState: 0
eventType: 35 <-
Ausgewähltes Element: Element 2

.... what das 0 and 35 mean?
.... if these numbers are indices of lists, what does this indices try to tell me?

thanks in advance, Manfred

Am 17.01.24 um 00:26 schrieb Manfred Rosenberger:
> listbox .lb -width 30
> pack .lb
> .lb insert 1 "Element 1"
> .lb insert 2 "Element 2"
> .lb insert 3 "Element 3"
>
> proc handleSelection {s T} {
> # Greife auf den aktuellen Text des ausgewählten Elements in der Listbox zu
> set selectedIndex [.lb curselection]
> if {$selectedIndex ne ""} {
> set selectedText [.lb get $selectedIndex]
> # Gib das ausgewählte Element und den Ereignistyp in der Konsole aus
> puts "eventState: $s"
> puts "eventType: $T <- [lindex [event info] $T]"
> puts "Ausgewähltes Element: $selectedText"
> }
> }
> bind .lb <<ListboxSelect>> [list handleSelection %W %s %T]
>
> =================
>
> eventState: 0
> eventType: 35 <-
> Ausgewähltes Element: Element 2
>
> ... what das 0 and 35 mean?
> ... if these numbers are indices of lists, what does this indices try to tell me?
>
> thanks in advance, Manfred

The %T event field holds the event's type, like KeyPress, KeyRelease,
ButtonPress, ButtonRelease, etc., where these numerical constants are
defined in the file xlib/X11/X.h as follows:

#define KeyPress 2
#define KeyRelease 3
#define ButtonPress 4
#define ButtonRelease 5
....
#define MappingNotify 34
....

In case of a virtual event, the type is defined in the file generic/tk.h as

#define VirtualEvent (MappingNotify + 1)

which results in 35.

The %s event field holds the state field from the event. For example,
on my Linux box, for a pure ButtonPress event its value is 16 = 0x10,
for ButtonPress with the Shift key down it is 17 = 0x11, and so on. For
a virtual event like <<ListboxSelect>>, the state is set to 0.

--
Csaba Nemethi https://www.nemethi.de mailto:csaba.nemethi@t-online.de

interresting!
wouldnt it be better to get the name of the event, then its index in a list?
thanks a lot!
kLg. Manfred