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WMLiberty Demos - Double-clicks in a ListView

WMLiberty -> Demos -> API-Created Controls -> Double-clicks in a listview (Download)

Code:

' Trapping double-clicks in a listview
' By Brent D. Thorn, 12/2007
' PUBLIC DOMAIN

'Define a few structs
Struct LVITEM, _
mask As ULong, _
iItem As Long, _
iSubItem As Long, _
state As ULong, _
stateMask As ULong, _
pszText As Ptr, _
cchTextMax As Long, _
iImage As Long, _
lParam As Long, _
iIndent As Long
Struct NMHDR, _
hwndFrom As ULong, _
idFrom As ULong, _
code As Long
Struct NMITEMACTIVATE, _
hdr.hwndFrom As ULong, _
hdr.idFrom As ULong, _
hdr.code As Long, _
iItem As Long, _
iSubItem As Long, _
uNewState As ULong, _
uOldState As ULong, _
uChanged As ULong, _
ptAction.x As Long, _
ptAction.y As Long, _
lParam As Long, _
uKeyFlags As ULong

Open "WMLiberty" For DLL As #wmlib

Open "Listview NM_DBLCLK Demo" For Window As #1
#1 "TrapClose Quit"

'Get instance handle
CallDLL #kernel32, "GetModuleHandleA", _
_NULL As Long, _
hInst As Long
'Create listview control
hLV = CreateWindowEx(_WS_EX_CLIENTEDGE, "SysListview32", "", _
_WS_CHILD Or _WS_VISIBLE Or 3, _
5, 5, 300, 300, _
HWnd(#1), 0, hInst, 0)

'Add a few items to play with
For i = 0 To 4
Call ListView.InsertItem hLV, i, "Double-click me"
Next

'Set up "notify" event trapping
Callback lpfn, OnNotify( ULong, ULong, ULong, ULong ), Long
Call SetWMHandler HWnd(#1), _WM_NOTIFY, lpfn, -1

Call DoEvents
Sub DoEvents
[Loop]
Scan
CallDLL #kernel32, "Sleep", 50 As Long, r As Void
GoTo [Loop]
End Sub
Sub Quit Me$
Close #Me$
Close #wmlib
End
End Sub

'Callback function to handle WM_NOTIFY messages
Function OnNotify( hWnd, uMsg, wParam, lParam )
NMHDR.struct = lParam
Select Case NMHDR.code.struct
Case -3 'NM_DBLCLK
NMITEMACTIVATE.struct = lParam
iItem = NMITEMACTIVATE.iItem.struct
If iItem < 0 Then
Print "Double-clicked listview background"
Else
'For some reason, placing a NOTICE here causes problems.
Print "Double-clicked item #"; iItem
End If
End Select
End Function

'*** Wrapper Functions ***
Function CreateWindowEx( dwExStyle, ClassName$, lpWindowName$, dwStyle, x, y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam )
CallDLL #user32, "CreateWindowExA", _
dwExStyle As ULong, _
ClassName$ As Ptr, _
lpWindowName$ As Ptr, _
dwStyle As ULong, _
x As Long, _
y As Long, _
nWidth As Long, _
nHeight As Long, _
hWndParent As ULong, _
hMenu As ULong, _
hInstance As ULong, _
lpParam As ULong, _
CreateWindowEx As ULong
End Function
Sub ListView.InsertItem hWnd, iItem, Text$
LVITEM.mask.struct = 1 'LVIF_TEXT
LVITEM.iItem.struct = iItem
LVITEM.iSubItem.struct = 0
LVITEM.pszText.struct = Text$
CallDLL #user32, "SendMessageA", _
hWnd As long, _
4103 As long, _ 'LVM_INSERTITEM
0 As long, _
LVITEM As struct, _
r As long
End Sub
Sub SetWMHandler hWnd, uMsg, lpfnCB, lSuccess
CallDLL #wmlib, "SetWMHandler", _
hWnd As ULong, _
uMsg As ULong, _
lpfnCB As ULong, _
lSuccess As Long, _
r As Long
End Sub