I try to implement an Combo Box that Suggests Options.
Eg: if I enters "ES" in the symbol box, only those items that have ES somewhere
in their name will show
up, like ESCAPE, TEST.
But the implemented ComboBox doesn't show dropdow list,
show user must click on button of ComboBox to show it.
Source:
import Graphics.UI.WX
import Graphics.UI.WXCore
import Graphics.UI.WX.Events
import Data.List
symbols =
["ESH11","VIETTEL","METFONE","VIETNET","MENFONE","HUNET"]
--filter item in the symbols list
searchString :: String -> String -> String
searchString strInput strRaw = do
if strInput `isInfixOf` strRaw then
strRaw
else
""
dataManager :: IO ()
dataManager = do
frmDataManager <- frame [text:= "Data Manager"]
cbbSymbols <- comboBoxEx frmDataManager wxCB_DROPDOWN [visible := True]
set cbbSymbols [items := symbols, on keyboard:= cbbKeypresss cbbSymbols]
where
cbbKeypresss cbb keyEvent = do --filter text when user enter text on
comboBox
case (keyKey keyEvent) of
KeyUp -> propagateEvent
KeyDown -> propagateEvent
KeyBack -> do
propagateEvent
other -> do
showText cbb (showKey (keyKey keyEvent))
where
showText cbb nextText = do
txt <- (get cbb text)
numItem <-(get cbb itemCount)
comboBoxRemove cbb 0 (numItem -1);
set cbb [text := ""]
set cbb [text :=txt ++ nextText]
txt <- (get cbb text)
let notNull x = not (null x) in mapM_
(comboBoxAppend cbb) ( filter notNull (map (searchString txt) symbols))
Could anyone help me a document about this?
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