win32 programmers.....CBEX and work around
Hi everyone,
I have tried most methods i can think of ATM, but i have failed to
remove the bug we
have with comboboxex controls. if you don't know what i'm meaning then
run de comboboxex
example that comes with win32lib. There always appears to be a
"selected" sort of line
above the edit control of the comboboxex. I have tried using
SetWindowPos after setting
an image list to the control as told in
the SDK but hell no, the bug won't leave. I found out, the vertical
height of the
comboboxex(not the dropdown) depends on the size of the image list.
Anyway, i tried
making a smaller image list but it looks like the minimum image list
size of comboboxex
is 14 by 14 pixels.
I later started creating my comboboxex's with the Extended style
CBES_EX_NOSIZELIMIT as default, with this i was able to use SetWindowPos
to make the
control smaller(vertically) than the default, but still there was no
way, i would get
a combo box that didn't seem to be highlighted all the time.
After, that failed attempt. I tried retrieving the handle of the
EditControl,
then "moving it" one step higher using setRect()to cover that selected
line within then
control itself, still failed. i later found out the RECT of the
EditControl was always
{0,0,0,14}. so i decided to do use SetWindowPos() and setRect()
specifying the RECT
as {0,-2,0,14} but i still failed.
As i'm writting this, i'm remaining with one more method to try, that
is i'm
going to set-up a "onSelection " handler of the combo and after i select
an item, i
setfocus off the combo. this is the only work around i have left and i'm
sure it will
work but it wouldn't be so elegant, now would it? anyway, please try out
your work
arounds too, we see if we can get this control to display items
correctly.
I really don't think i would consider this a Microsoft bug in common
controls,
cause i haven't seen this happen in other languages. Anyway, is there a
C++ programmer
out there(Tone Skoda) who could try to create a comboboxex example in
C++ and see if they could replicate the same bug.
Also, i have failed to give the comboboxex a 3D look because every time
i do that using WS_EX_STATICEDGE as the exStyle. It seems to cover the
DropDown Button.
Ok people, I can easily solve these bugs by creating a full blown
owner-draw for a
combobox control. But that would mean iam re-inventing the wheel as the
ComboBoxEx was
primarily created to do this. If there is no/failed final attempt to rid
these bugs, then i would suggest we clear the ComboBoxEx control from
win32lib and make a simulated
comboboxex(by performing owner-draws internally in win32lib)
Here is my ugly final code that "attempts",
--XX CUT HERE
-- ComboBoxEx.exw
-- Matt Lewis Modified to show work-around by me
with trace
without warning
include win32lib.ew
constant
Win = create( Window, "ComboBoxEx Demo", 0, 20, 20, 400, 400, 0),
CBE = create( ComboBoxEx, "", Win, 5, 20, 210, 300, 0 ),
MLE = create( MleText, "", Win, 5, 60, 210, 200, 0)
-- Start: Jordah
atom EditCtl
-- Get handle of the Edit Control of the ComboBoxEx
EditCtl = w32Func(xSendMessage,{getHandle(CBE),(WM_USER +
7),0,0})--CBEM_GETEDITCONTROL
atom iMsg,Code,cmd
procedure onEvent_(atom id,integer event,object params)
iMsg = params[1]
if iMsg = WM_COMMAND then
Code = hi_word(params[2])
cmd = params[3]
if Code = CBN_SELCHANGE or
Code = CBN_CLOSEUP or
Code = CBN_SELENDOK or
Code = CBN_SELENDCANCEL then
if id = CBE then -- Just to make sure. Sh'd probably omit this if
statement
w32Proc(xSetFocus,{0})
w32Proc(xSetFocus,{EditCtl})
end if
end if
end if
end procedure
setHandler(CBE,w32HEvent,routine_id("onEvent_"))
procedure start_up(atom id,integer event,object params)
-- This helps killing the Default Focus the CBE has on startup
-- By giving the mainwindow focus
w32Proc(xSetFocus,{0})
w32Proc(xSetFocus,{id})
end procedure
setHandler(Win,w32HActivate, routine_id("start_up"))
-- End: Jordah
atom ptr, iExw
ptr = allocate_string( "exw" )
iExw = w32Func(xLoadIcon,{instance(), ptr} )
free(ptr)
constant
closefolder = addIcon( extractIcon( "clsdfold.ico" ) ),
openfolder = addIcon( extractIcon( "openfold.ico" )),
win = addIcon( iExw ),
dos = addIcon( extractIcon( "disk05.ico" )),
linux = addIcon( extractIcon( "disk06.ico" )),
generic = addIcon( extractIcon( "disks04.ico" ))
addItem( CBE, {"Select to open", closefolder, openfolder })
addItem( CBE, {"Disk icons.", dos, linux })
WinMain( Win, Normal )
--------XX Cut here
I hope someone comes up with a better solution. Happy research everyone.
This is just a hack to enable people to use a ComboboxEX but with a more
appealing look. :)
Jordah Ferguson
aka Sir_LoJiK
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