Two methods for retrieving the ListItem object that the mouse is over in a ListView control.
This code gives you two methods (one using built-in functions of the ListView control, and one using SendMessage and the LVM_GETITEMRECT constant) to retrieve the ListItem object that the mouse pointer is currently over with. This is demonstrated by highlighting the item.
Original Author: Jon B. Mooty
Inputs
To test the SendMessage method set the constant USE_SENDMESSAGE to True.
Returns
The current ListItem object the mouse pointer is over.
API Declarations
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Const LVM_GETITEMRECT = &H100E
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Code
' change this to true in order
' to test the SendMessage method
#Const USE_SENDMESSAGE = False
' you will need a ListView control
' named lvw in order to test the
' following code
Private Sub Form_Load()
Dim iCol As Integer, iRow As Integer
Dim sPos As String
' setup listview
' use report view with 3 columns and 500
' rows
lvw.View = lvwReport
lvw.MultiSelect = False
lvw.ColumnHeaders.Add , , "Column1"
lvw.ColumnHeaders.Add , , "Column2"
lvw.ColumnHeaders.Add , , "Column3"
For iRow = 1 To 500
For iCol = 1 To 3
sPos = "Row = " & iRow & ", " & "Col = " & iCol
If iCol = 1 Then
lvw.ListItems.Add , , sPos
Else
lvw.ListItems(iRow).SubItems(iCol - 1) = sPos
End If
Next iCol
Next iRow
End Sub
Public Function GetListViewItemFromPt(plvw As ListView, x As Single, y As Single) As ListItem
Dim bFound As Boolean
Dim rCur As RECT
Dim iIndex As Integer
Dim iPixX As Integer, iPixY As Integer
' convert the coordinates to
' pixels (remove the next two
' lines if you will be passing
' the coordinates in pixels)
iPixX = Me.ScaleX(x, vbTwips, vbPixels)
iPixY = Me.ScaleY(y, vbTwips, vbPixels)
For iIndex = 1 To plvw.ListItems.Count
' get the coordinates for each
' item in the listbox in its current
' state, if Top is less than 0 or Bottom
'
' is greater than the height of the
' listbox then the item is currently out
' of the
' viewable area
rCur.Left = 0
SendMessage plvw.hwnd, LVM_GETITEMRECT, iIndex, rCur
' if passed corrdinates are within
' the bounds of the current item than
' exit the loop and return the ListItem
' object
If iPixY >= rCur.Top And iPixY <= rCur.Bottom Then
bFound = True
Exit For
End If
Next iIndex
If bFound Then
Set GetListViewItemFromPt = plvw.ListItems(iIndex + 1)
Else
Set GetListViewItemFromPt = Nothing
End If
End Function
Private Sub lvw_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
' set the selected ListItem object equal
' to the Item the mouse
' is currently over
#If USE_SENDMESSAGE Then
Set lvw.SelectedItem = GetListViewItemFromPt(lvw, x, y)
#Else
Set lvw.SelectedItem = lvw.HitTest(x, y)
#End If
End Sub
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