Click event on a ListView (or it's items)

[Iuli 0]

Hello,

I just started a new project in AutoIT, however i encountered a small problem.

How can i catch the click event on a ListView (or one of it's items). I tried by checking it via GUIGetMsg (). This will not work when clicking an item. I also tried by creating a function and adding it to the main while loop and checking the click by GUIGetCursorInfo () and _IsPressed ("01") functions, this seems to work, but only when the item is double clicked.

Any workarounds for this ?

Thanks.

Edited February 25, 2011 by Iuli

[AdmiralAlkex 125]

The example for _GUICtrlListView_Create() does exactly that

[PsaltyDS 39]

You need to register a WM_NOTIFY message handler with GuiRegisterMsg(). It doesn't have to be as complicated as the example under that function in the help file, but you do usually need to know enough to extract the useful info from a DllStruct. You would be looking for NM_Click messages from the ListView.

If you search on that, you'll find working examples on the forum.

Edit: Even better, the example under _GUICtrlListView_Create() as AdmiralAlkex said, but you can simplify it much from there too.

Edited February 25, 2011 by PsaltyDS

[Iuli 0]

Thanks a lot

[LondonNDIB 0]

Any chance of getting a simple example?? Just a basic setup with one control, one item, and a msgbox demostrating the item has been clicked?

[LondonNDIB 0]

The example for _GUICtrlListView_Create() does exactly that

Does it?? I opened that help file and ran it and clicked items... nothing. At all. nada.

[PsaltyDS 39]

Yes, it works fine. You have to run it in SciTE so you can see the reporting in the console pane to show you the results.

I don't blame you for being put off by the sloppy state of that example, though.

Here it is stripped down to some more basic functionality:

expandcollapse popup

#AutoIt3Wrapper_au3check_parameters=-d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6
#include <GuiConstantsEx.au3>
#include <GuiListView.au3>
#include <GuiImageList.au3>
#include <WindowsConstants.au3>

Opt('MustDeclareVars', 1)

$Debug_LV = False ; Check ClassName being passed to ListView functions, set to True and use a handle to another control to see it work

Global $hListView
Global $GUI, $hImage
$GUI = GUICreate("(UDF Created) ListView Create", 400, 300)

$hListView = _GUICtrlListView_Create($GUI, "", 2, 2, 394, 268)
_GUICtrlListView_SetExtendedListViewStyle($hListView, BitOR($LVS_EX_GRIDLINES, $LVS_EX_FULLROWSELECT, $LVS_EX_SUBITEMIMAGES))
GUISetState()

GUIRegisterMsg($WM_NOTIFY, "WM_NOTIFY")

; Load images
$hImage = _GUIImageList_Create()
_GUIImageList_Add($hImage, _GUICtrlListView_CreateSolidBitMap($hListView, 0xFF0000, 16, 16))
_GUIImageList_Add($hImage, _GUICtrlListView_CreateSolidBitMap($hListView, 0x00FF00, 16, 16))
_GUIImageList_Add($hImage, _GUICtrlListView_CreateSolidBitMap($hListView, 0x0000FF, 16, 16))
_GUICtrlListView_SetImageList($hListView, $hImage, 1)

; Add columns
_GUICtrlListView_InsertColumn($hListView, 0, "Column 1", 100)
_GUICtrlListView_InsertColumn($hListView, 1, "Column 2", 100)
_GUICtrlListView_InsertColumn($hListView, 2, "Column 3", 100)

; Add items
_GUICtrlListView_AddItem($hListView, "Row 1: Col 1", 0)
_GUICtrlListView_AddSubItem($hListView, 0, "Row 1: Col 2", 1)
_GUICtrlListView_AddSubItem($hListView, 0, "Row 1: Col 3", 2)
_GUICtrlListView_AddItem($hListView, "Row 2: Col 1", 1)
_GUICtrlListView_AddSubItem($hListView, 1, "Row 2: Col 2", 1)
_GUICtrlListView_AddItem($hListView, "Row 3: Col 1", 2)

; Loop until user exits
Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE
GUIDelete()

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

    $tNMHDR = DllStructCreate($tagNMHDR, $ilParam)
    $hWndFrom = HWnd(DllStructGetData($tNMHDR, "hWndFrom"))
    $iIDFrom = DllStructGetData($tNMHDR, "IDFrom")
    $iCode = DllStructGetData($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, $ilParam)
                    _DebugPrint("$NM_CLICK" & @LF & "--> hWndFrom:" & @TAB & $hWndFrom & @LF & _
                            "-->IDFrom:" & @TAB & $iIDFrom & @LF & _
                            "-->Code:" & @TAB & $iCode & @LF & _
                            "-->Index:" & @TAB & DllStructGetData($tInfo, "Index") & @LF & _
                            "-->SubItem:" & @TAB & DllStructGetData($tInfo, "SubItem") & @LF & _
                            "-->NewState:" & @TAB & DllStructGetData($tInfo, "NewState") & @LF & _
                            "-->OldState:" & @TAB & DllStructGetData($tInfo, "OldState") & @LF & _
                            "-->Changed:" & @TAB & DllStructGetData($tInfo, "Changed") & @LF & _
                            "-->ActionX:" & @TAB & DllStructGetData($tInfo, "ActionX") & @LF & _
                            "-->ActionY:" & @TAB & DllStructGetData($tInfo, "ActionY") & @LF & _
                            "-->lParam:" & @TAB & DllStructGetData($tInfo, "lParam") & @LF & _
                            "-->KeyFlags:" & @TAB & DllStructGetData($tInfo, "KeyFlags"))
                Case $NM_RCLICK ; Sent by a list-view control when the user clicks an item with the right mouse button
                    $tInfo = DllStructCreate($tagNMITEMACTIVATE, $ilParam)
                    _DebugPrint("$NM_RCLICK" & @LF & "--> hWndFrom:" & @TAB & $hWndFrom & @LF & _
                            "-->IDFrom:" & @TAB & $iIDFrom & @LF & _
                            "-->Code:" & @TAB & $iCode & @LF & _
                            "-->Index:" & @TAB & DllStructGetData($tInfo, "Index") & @LF & _
                            "-->SubItem:" & @TAB & DllStructGetData($tInfo, "SubItem") & @LF & _
                            "-->NewState:" & @TAB & DllStructGetData($tInfo, "NewState") & @LF & _
                            "-->OldState:" & @TAB & DllStructGetData($tInfo, "OldState") & @LF & _
                            "-->Changed:" & @TAB & DllStructGetData($tInfo, "Changed") & @LF & _
                            "-->ActionX:" & @TAB & DllStructGetData($tInfo, "ActionX") & @LF & _
                            "-->ActionY:" & @TAB & DllStructGetData($tInfo, "ActionY") & @LF & _
                            "-->lParam:" & @TAB & DllStructGetData($tInfo, "lParam") & @LF & _
                            "-->KeyFlags:" & @TAB & DllStructGetData($tInfo, "KeyFlags"))
                    Return 0 ; allow the default processing
                Case $NM_RETURN ; The control has the input focus and that the user has pressed the ENTER key
                    _DebugPrint("$NM_RETURN" & @LF & "--> hWndFrom:" & @TAB & $hWndFrom & @LF & _
                            "-->IDFrom:" & @TAB & $iIDFrom & @LF & _
                            "-->Code:" & @TAB & $iCode)
            EndSwitch
    EndSwitch
    Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_NOTIFY

Func _DebugPrint($s_text, $line = @ScriptLineNumber)
    ConsoleWrite( _
            "!===========================================================" & @LF & _
            "+======================================================" & @LF & _
            "-->Line(" & StringFormat("%04d", $line) & "):" & @TAB & $s_text & @LF & _
            "+======================================================" & @LF)
EndFunc   ;==>_DebugPrint

The only actions this responds to are left click, right click, and hitting ENTER. When those actions happen, they generate WM_NOTIFY messages, which contain either NM_CLICK, NM_RCLICK, or NM_RETURN codes, plus info on which row and column was active. You will see all that info in the console pane, like this:

+======================================================
-->Line(0061):  $NM_CLICK
--> hWndFrom:   0x0003072A
-->IDFrom:  10000
-->Code:    -2
-->Index:   1
-->SubItem: 1
-->NewState:    0
-->OldState:    5697508
-->Changed: 0
-->ActionX: 0
-->ActionY: 0
-->lParam:  0
-->KeyFlags:    0
+======================================================

[LondonNDIB 0]

Thanks. I, for one, found it easier to figure out an entirely different way to tackle the problem... but it occurs to me that so much work has already been done with the _GUICtrlListView_ UDF that somewhere in there, we'd see a _GUICtrlListView_Action_ItemClicked or something where we could easily define a function to run in the event that an item has been clicked. It seems so obvious, that it must be difficult because surely its been thought of already and dismissed for good reason.