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Multiple combo boxes, mutually exclusive lists

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Let's say I have three combo boxes for selecting your three favorite colors in order, each of which contains the exact same list of colors (as in only one list is defined, and it is used to populate all three combo boxes).

When a user chooses a color from any of the three boxes, I want that option to disappear from the other two boxes. If at any time the user switches a box from one color to another, the previously removed color is added back to each box as an option, and the new option is removed from the other two boxes. What's the simplest way to go about this?

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I would approach this from a different angle. I would keep the list constant but only allow the user to select a colour that was not already displayed in one of the other combos. This script shows what I mean: ;)

#include <GUIConstantsEx.au3>

; The list of colours
$sColours = "|Red|White|Blue|Green"

; The initial selections
Global $aSelection[3] = ["Red", "White", "Blue"]

$hGUI = GUICreate("Test", 500, 500)

$cCombo_1 = GUICtrlCreateCombo("", 10, 10, 200, 20)
GUICtrlSetData(-1, $sColours, "Red")
$cCombo_2 = GUICtrlCreateCombo("", 10, 40, 200, 20)
GUICtrlSetData(-1, $sColours, "White")
$cCombo_3 = GUICtrlCreateCombo("", 10, 70, 200, 20)
GUICtrlSetData(-1, $sColours, "Blue")


While 1

    $iMsg = GUIGetMsg()
    Switch $iMsg
        Case $GUI_EVENT_CLOSE
        Case $cCombo_1, $cCombo_2, $cCombo_3
            ; Check the selection


Func _Check_Selection($iCID)

    ; What has been selected
    $sSel = GUICtrlRead($iCID)
    ; And what index of the array holds the current selection
    $iIndex = $iCID - $cCombo_1
    ; Loop through the array
    For $i = 0 To 2
        ; No pint in checking the control itself
        If $i = $iIndex Then
        ; But if the selcetion matches one of the other combos
        If $sSel = $aSelection[$i] Then
            ; Reset this combo to the previosu selection
            GUICtrlSetData($iCID, $sColours, $aSelection[$iIndex])
    ; It is a unique selection so allow to shoe and save it in the array
    $aSelection[$iIndex] = $sSel


Any use? :)


Edited by Melba23

Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______Open Open spoiler to see my UDFs:


ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area


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Very useful, thanks. I was approaching it with the wrong mindset, this worked well.

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