This is extremely interesting!
In Mapbasic.def (like Anssi I'm looking at v5.0) there are the following
defines under the CommandInfo section:
Define CMD_INFO_EDIT_TABLE 1
Define CMD_INFO_EDIT_STATUS 2
Define CMD_INFO_EDIT_ASK 1
Define CMD_INFO_EDIT_SAVE 2
Define CMD_INFO_EDIT_DISCARD 3
The handler is triggered just *before* the table is closed. If there are
unsaved edits in the table being closed the handler executes and then you
get the "Do you want to save your changes?" dialog.
In your SaveTableEditsHandler, if you call CommandInfo(CMD_INFO_EDIT_TABLE)
you get the name of the table which is being closed.
I can't work out what happens when you call
CommandInfo(CMD_INFO_EDIT_STATUS). So far I have only been able to get a
value of 1 back, which I guess is CMD_INFO_EDIT_ASK, meaning the table is
set to prompt me if I want to save edits. I guess there must be situations
in which edits are automatically saved or discarded, and Commandinfo would
then return CMD_INFO_EDIT_SAVE and ~_DISCARD respectively, but I can't see
what those situations would be. I have tried opening tables READONLY, and
setting FASTEDIT ON, but neither of these seems to produce the expected
result. I have a suspicion ~SAVE and ~DISCARD only apply to special "system"
tables, such as label-layers, cosmetic-layers, grids, thematics, etc. I
haven't had time to experiment further. To get a glimpse of this uncharted
terrain, close a mapper window and the SaveTableEditsHandler triggers for a
layer called something like "1_WINDOW".
I have to do some real work. If anyone wants to experiment further, below is
the MB code I used.
'*****************
include "mapbasic.def"
declare sub main
declare sub SaveTableEditsHandler
sub main
OnError goto tab_not_open_error
close table test
OnError goto 0
Open Table "test.TAB"
browse * from test
exit sub
tab_not_open_error:
resume next
end sub 'main
'****************
sub SaveTableEditsHandler
dim i_edit_status as smallint
print "In sub SaveTableEditsHandler..."
print "CMD_INFO_EDIT_TABLE =" + CommandInfo(CMD_INFO_EDIT_TABLE)
i_edit_status = CommandInfo(CMD_INFO_EDIT_STATUS)
print "CMD_INFO_EDIT_STATUS =" + i_edit_status
end sub 'SaveTableEditsHandler
'*******************
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