1. Win32Lib: onChange Event for List Not Working (?)
- Posted by cklester <cklester at yahoo.com>
Nov 16, 2004
-
Last edited Nov 17, 2004
Derek, this program demonstrates on my PC that the onChange event for the
ListBox is not working as expected. Notice I said "as expected," because
maybe my expectations are off a bit. :)
When you click the "Add" or "Remove" button, it changes the List. The
change in the list should trigger a change in the appearance of the "Next"
button... but it doesn't.
Any help will be appreciated.
include Win32lib.ew
without warning
constant Window1 = createEx( Window, "Window1", 0, Default, Default, 276, 168,
0, 0 )
constant bttn_Add = createEx( PushButton, "Add", Window1, 168, 20, 88, 28, 0, 0
)
constant bttn_Remove = createEx( PushButton, "Remove", Window1, 168, 52, 88, 28,
0, 0 )
constant theList = createEx( List, "List of Stuff", Window1, 4, 8, 148, 120, 0,
0 )
constant bttn_Next = createEx( PushButton, "Next -->", Window1, 168, 104, 88,
28, 0, 0 )
sequence alpha
alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
setEnable(bttn_Next,w32False)
procedure theList_onChange (integer self, integer event, sequence
params)--params is ()
if getCount(self) > 0 then
setEnable(bttn_Next,w32True)
else
setEnable(bttn_Next,w32False)
end if
end procedure
setHandler( theList, w32HChange, routine_id("theList_onChange"))
procedure bttn_Add_onClick (integer self, integer event, sequence
params)--params is ()
-- add random item to list
addItem(theList, { alpha[rand(length(alpha))] } )
end procedure
setHandler( bttn_Add, w32HClick, routine_id("bttn_Add_onClick"))
procedure bttn_Remove_onClick (integer self, integer event, sequence
params)--params is ()
integer i
i = getCount(theList)
if i > 0 then
VOID = deleteItem(theList,rand(i))
end if
end procedure
setHandler( bttn_Remove, w32HClick, routine_id("bttn_Remove_onClick"))
WinMain( Window1,Normal )
-=ck
"Programming in a state of EUPHORIA."
http://www.cklester.com/euphoria/
2. Re: Win32Lib: onChange Event for List Not Working (?)
- Posted by Derek Parnell <ddparnell at bigpond.com>
Nov 16, 2004
-
Last edited Nov 17, 2004
cklester wrote:
>
> Derek, this program demonstrates on my PC that the onChange event for the
> ListBox is not working as expected. Notice I said "as expected," because
> maybe my expectations are off a bit. :)
>
> When you click the "Add" or "Remove" button, it changes the List. The
> change in the list should trigger a change in the appearance of the "Next"
> button... but it doesn't.
>
> Any help will be appreciated.
Just change 'w32HChange' to 'w32HDataChange'.
The w32HChange detects changes in the selection. In other words, this
is fired when the selection changes from one item to another. The
w32HDataChange is fired when items are added or deleted from a List
or a Combo control.
The parameters for the Data Change event are ...
{ eventqual, index }
where eventqual is one of
w32CHG_Add = Item added (List & Combo)
w32CHG_Del = Item deleted (List & Combo)
w32CHG_Chg = Item changed (Combo)
and index is the index of the item added/deleted.
--
Derek Parnell
Melbourne, Australia
3. Re: Win32Lib: onChange Event for List Not Working (?)
Derek Parnell wrote:
> cklester wrote:
> > When you click the "Add" or "Remove" button, it changes the List. The
> > change in the list should trigger a change in the appearance of the "Next"
> > button... but it doesn't.
> Just change 'w32HChange' to 'w32HDataChange'.
Excellent! Thanks. :)
-=ck
"Programming in a state of EUPHORIA."
http://www.cklester.com/euphoria/
