Call Function when Item is selected in ListView

[DarkBoost]

Is there a Windows Message Code I can use with GUIRegisterMsg() to execute a function when an item in a ListView is selected?

I have used $WM_MOUSEACTIVE which kinda works but only with a double-click but not a single-click.

#include <GUIConstantsEx.au3>
#include <GUIListView.au3>
#include <WindowsConstants.au3>

GUICreate("", 500, 500)
    Dim $hList = GUICtrlCreateListView("List Items", 10, 10, 480, 450)
    Dim $hInput = GUICtrlCreateInput("", 10, 470, 480, 20)

    For $x = 0 To 20
        GUICtrlCreateListViewItem("List Item No. " & $x, $hList)
    Next

    _GUICtrlListView_SetColumnWidth($hList, 0, 470)

GUISetState()
GUIRegisterMsg($WM_MOUSEACTIVATE, "ListSelect")

Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE

Func ListSelect()
    Local $hCount = _GUICtrlListView_GetItemCount($hList)
    For $y = 0 to $hCount
        If _GUICtrlListView_GetItemSelected($hList, $y) = True Then GUICtrlSetData($hInput, _GUICtrlListView_GetItemText($hList, $y))
    Next
EndFunc

[UEZ]

Try this:

expandcollapse popup

#include <GUIConstantsEx.au3>
#include <GUIListView.au3>
#include <WindowsConstants.au3>

GUICreate("", 500, 500)
    Global $hListView = GUICtrlCreateListView("List Items", 10, 10, 480, 450)
    Global $hInput = GUICtrlCreateInput("", 10, 470, 480, 20)

    For $x = 0 To 20
        GUICtrlCreateListViewItem("List Item No. " & $x, $hListView)
    Next

    _GUICtrlListView_SetColumnWidth($hListView, 0, 470)

GUISetState()
GUIRegisterMsg($WM_NOTIFY, "WM_NOTIFY")

Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE

Func Action($index)
    MsgBox(0, "Information", _GUICtrlListView_GetItemText($hListView, $index))
EndFunc

Func WM_NOTIFY($hWnd, $iMsg, $iwParam, $ilParam)
    #forceref $hWnd, $iMsg, $iwParam
    Local $hWndFrom, $iCode, $tNMHDR, $hWndListView, $tInfo
    $hWndListView = $hListView
    If Not IsHWnd($hListView) Then $hWndListView = GUICtrlGetHandle($hListView)

    $tNMHDR = DllStructCreate($tagNMHDR, $ilParam)
    $hWndFrom = HWnd(DllStructGetData($tNMHDR, "hWndFrom"))
    $iCode = DllStructGetData($tNMHDR, "Code")
    Switch $hWndFrom
        Case $hWndListView
            Switch $iCode
                Case $NM_CLICK ; Sent by a list-view control when the user clicks an item with the left mouse button
                    $tInfo = DllStructCreate($tagNMITEMACTIVATE, $ilParam)
                    Action(DllStructGetData($tInfo, "Index"))
            EndSwitch
    EndSwitch
    Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_NOTIFY

Br,

UEZ

[DarkBoost]

Thank you for the quick response and this does work well but wondering what and why is there so much code in the WM_NOTIFY function?

I do not know what all this is doing but I can enter a check like: If GUICtrlGetHandle($GuiListView) <> 0 Then .... and it works just the same?

[PsaltyDS]

It does? You should find that a control handle is <> 0 at any time, not just when it has been clicked.

The check you may be looking at is just to accommodate inexperienced users that don't know the difference between a ControlID and the HWND, so they tend to pass the former where the latter is required. Most UDFs guard against this mistake in that fashion.