Why do these Radio Buttons act as a "group"?

[cbruce]

The example code shows my quandry.... The Radio Buttons act as a "group" (only one selected at a time, etc.),

even though there is no GUICtrlCreateGroup() or GUIStartGroup().

Why are they acting as if they were grouped??

When do I need to use GUICtrlCreateGroup() or GUIStartGroup()?

expandcollapse popup

#include <ButtonConstants.au3>
#include <ComboConstants.au3>
#include <DateTimeConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>
Opt("GUIResizeMode", $GUI_DOCKAUTO)

#Region ### START Koda GUI section ### Form=
$Form1_ID = GUICreate("Win_Title", 1012, 200, -1, -1, BitOR($GUI_SS_DEFAULT_GUI,$WS_SIZEBOX,$WS_THICKFRAME))
GUISetFont(10, 400, 0, "MS Sans Serif")
$btn_Now_ID = GUICtrlCreateButton("Now", 16, 24, 57, 24)
GUICtrlSetFont(-1, 10, 800, 0, "MS Sans Serif")
$date_From_ID = GUICtrlCreateDate("2010/10/24 19:45:1", 152, 8, 185, 21)
GUICtrlSetFont(-1, 9, 400, 0, "Courier")
$date_To_ID = GUICtrlCreateDate("2010/10/24 19:45:1", 152, 40, 185, 21)
GUICtrlSetFont(-1, 9, 400, 0, "Courier")
$inp_SpanHHmm_ID = GUICtrlCreateInput("", 424, 8, 81, 24, BitOR($GUI_SS_DEFAULT_INPUT,$ES_READONLY))
GUICtrlSetFont(-1, 12, 400, 0, "Courier")
$inp_SpanMinutes_ID = GUICtrlCreateInput("", 424, 40, 81, 24)
GUICtrlSetFont(-1, 12, 400, 0, "Courier")
$cbo_Channel_ID = GUICtrlCreateCombo("", 642, 8, 207, 25)
GUICtrlSetData(-1, "")
GUICtrlSetFont(-1, 12, 400, 0, "Courier")
$btn_Clear_TVShow_Filename_ID = GUICtrlCreateButton("Clear", 17, 80, 57, 24)
GUICtrlSetFont(-1, 10, 800, 0, "MS Sans Serif")
$txt_TVShow_Filename_ID = GUICtrlCreateEdit("", 152, 72, 841, 48)
GUICtrlSetData(-1, "")
GUICtrlSetFont(-1, 10, 400, 0, "Courier")

$lbl_Start_ID = GUICtrlCreateLabel("Start", 94, 8, 39, 23)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")
$lbl_Stop_ID = GUICtrlCreateLabel("Stop", 94, 40, 38, 23)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")
$lbl_HHmm_ID = GUICtrlCreateLabel("HH:mm", 352, 8, 63, 23)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")
$lbl_Minutes_ID = GUICtrlCreateLabel("Minutes", 351, 40, 63, 23)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")
$lbl_Channel_ID = GUICtrlCreateLabel("Channel", 560, 8, 71, 23)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")
$lbl_File_xxx_ID = GUICtrlCreateLabel("File -", 94, 72, 55, 24)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")
$lbl_xxx_Name_ID = GUICtrlCreateLabel("Name", 94, 90, 55, 24)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")
$lbl_Device = GUICtrlCreateLabel("Device", 560, 40, 71, 23)
GUICtrlSetFont(-1, 12, 800, 0, "MS Sans Serif")

; ????????????????????
; These Radio Buttons act as a "group" (only one selected at a time, etc.),
; even though there is no GUICtrlCreateGroup() or GUIStartGroup()...
; ????????????????????
;GUIStartGroup()
$rad_PVR = GUICtrlCreateRadio("PVR", 640, 40, 49, 17)
GUICtrlSetState(-1, $GUI_CHECKED)
$rad_VCR = GUICtrlCreateRadio("VCR", 704, 40, 49, 17)
$rad_DVR = GUICtrlCreateRadio("DVR", 768, 40, 49, 17)

GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###

While 1
    $nMsg = GUIGetMsg()
    Switch $nMsg
        Case $GUI_EVENT_CLOSE
            Exit

        Case $Form1_ID
        Case $btn_Now_ID
        Case $date_From_ID
        Case $date_To_ID
        Case $inp_SpanHHmm_ID
        Case $inp_SpanMinutes_ID
        Case $cbo_Channel_ID
        Case $btn_Clear_TVShow_Filename_ID
        Case $txt_TVShow_Filename_ID

        Case $rad_PVR
            MsgBox( 0, "Event", "$rad_PVR", 1)
        Case $rad_VCR
            MsgBox( 0, "Event", "$rad_VCR", 1)
        Case $rad_DVR
            MsgBox( 0, "Event", "$rad_DVR", 1)
    EndSwitch
WEnd

Thanks,

CBruce

[BrewManNH]

Radio buttons will always act as if in a group even when there's no grouping, because it's implied by default that they're grouped. You would use GUIStartGroup() when you have multiple radio buttons but you don't want them all linked together. For instance, you have 3 sets of radio buttons Group1, Group2, Group3; you want to start a group (GUIStartGroup())before creating each group so that the buttons in each group only affect the buttons within that group and not the other 2 groups.

[cbruce]

Thanks BrewMan.... side effects and witchery -- I can handle that...

CBruce