How to remove all keys at once in a Static Map ?

[pixelsearch]

Hello everybody

What is the correct way to remove all keys at once in a Map declared as Local Static ?

Because cycling through all the keys to remove them one by one isn't user friendly and not a good solution in case of a big Map.
I found a way to do it, but maybe you know if there is a native instruction that does it better ?

Please have a look at the following canvas, where a user drags one of the Tab controls inside the GUI to move it at a different place (they may be several Tab controls in the GUI as stated in the help file, function GUICtrlCreateTab) :

A GUI can only hold a single tab control, but it is possible to create child GUIs each holding a tab control.

 

expandcollapse popup

Func WM_ENTERSIZEMOVE($hWnd, $iMsg, $wParam, $lParam)
    Switch $hWnd
        Case $g_hGUIMask
            If $g_sClassName = "SysTabControl32" Then
                _TabIsMoving($g_idControl, $WM_ENTERSIZEMOVE)
            EndIf
        Case ...
            ...
    EndSwitch
    Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_ENTERSIZEMOVE

Func WM_MOVE($hWnd, $iMsg, $wParam, $lParam)
    Switch $hWnd
        Case $g_hGUIMask
            ... ; any control of the GUI just moved here (Tab control or other control), then :
            If $g_sClassName = "SysTabControl32" Then
                _TabIsMoving($g_idControl, $WM_MOVE)
            EndIf
        Case ...
            ...
    EndSwitch
    Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_MOVE

Func WM_EXITSIZEMOVE($hWnd, $iMsg, $wParam, $lParam)
    Switch $hWnd
        Case $g_hGUIMask
            If $g_sClassName = "SysTabControl32" Then
                _TabIsMoving($g_idControl, $WM_EXITSIZEMOVE)
            EndIf
        Case ...
            ...
    EndSwitch
    Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_EXITSIZEMOVE

Func _TabIsMoving($idTab, $iStage)
    ; called by WM_ENTERSIZEMOVE / WM_MOVE / WM_EXITSIZEMOVE
    ; NO MsgBox, _ArrayDisplay or any blocking function here !

    Local Static $mCtrl[]

    Switch $iStage
        Case $WM_ENTERSIZEMOVE
            ; populate $mCtrl[] just before a Tab control enters the moving/sizing modal loop.
            ...

        Case $WM_MOVE
            ; use $mCtrl[] keys & values while the user drags a Tab control
            ...

        Case $WM_EXITSIZEMOVE
            ; empty $mCtrl[] just after a Tab control has exited the moving/sizing modal loop.
            Local $mAlwaysEmpty[] ; no need to make this one Static too
            $mCtrl = $mAlwaysEmpty
    EndSwitch
EndFunc   ;==>_TabIsMoving

As you notice, a 2nd map ($mAlwaysEmpty) has been used to quickly clear all keys in $mCtrl, is it the correct way ?

For the record, if a Local Static Array (or Scripting.Dictionary) was used instead of the Local Static Map, then native functions already exist to quickly clear the Array or Dictionary Object (while keeping it Static) i.e.
* For an array : ReDim $aCtrl[0][...]
* For a dictionary object : $oCtrl.RemoveAll()

Thanks for reading and have a great day

Edited Wednesday at 11:15 AM by pixelsearch
typo

[jchd]

3 hours ago, pixelsearch said:

is it the correct way ?

Seems pretty good. Also you can make the empty map static too, no need to reallocate it multiple times.

[ioa747]

I usually use a helper function  from

Func _MapClear(ByRef $mMap)
    Local $m[]
    $mMap = $m
EndFunc   ;==>_MapClear