これを実装すると途端にリストボックスが使いにくくなる(笑) ファイルリストボックスでも有効だね。
Private Type POINTAPI 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 Declare Function ClientToScreen Lib "user32" (ByVal hWnd As Long, lpPoint As POINTAPI) As Long Private Declare Function LBItemFromPt Lib "comctl32.dll" (ByVal hLB As Long, ByVal ptX As Long, ByVal ptY As Long, ByVal bAutoScroll As Long) As Long
Private Const LB_SETCURSEL = &H186
'--------------------------------------------------------------------------- ' 関数名: SelectItemUnderCursor ' 機能 : カーソル以下のアイテムを自動選択する ' 引数 : (in)hWnd … リストボックスのハンドル ' (in)xPos … リストボックスのカーソルX位置 ' (in)yPos … リストボックスのカーソルY位置 ' 返り値: 1…正常終了 0…異常終了 '--------------------------------------------------------------------------- Public Sub SelectItemUnderCursor(ByVal hWnd As Long, ByVal xPos As Long, ByVal yPos As Long) Dim ListItemIndex As Long Dim SelectedIndex As Long Dim udtPoint As POINTAPI With udtPoint .X = xPos .Y = yPos End With 'スクリーン座標に変換 Call ClientToScreen(hWnd, udtPoint) 'カーソル以下のアイテムインデックスを得る(0が基準)…(1) ListItemIndex = LBItemFromPt(hWnd, udtPoint.X, udtPoint.Y, False) '選択されたアイテムのインデックスを得る(0が基準)…(2) SelectedIndex = SendMessage(hWnd, LB_GETCURSEL, 0, ByVal 0&) '(1)と(2)の数が違うなら(1)の位置を選択する If ListItemIndex <> SelectedIndex Then Call SendMessage(hWnd, LB_SETCURSEL, ListItemIndex, ByVal 0&) End If End Sub 呼び出し側。 Private Sub Form_Load() With List1 .AddItem "WM_LBUTTONDBCLICK" .AddItem "WM_LBUTTONDOWN" .AddItem "WM_LBUTTONUP" .AddItem "WM_MOUSEACTIVE" .AddItem "WM_MOUSEMOVE" .AddItem "WM_NCHITTEST" .AddItem "WM_NCLBUTTONDBCLICK" .AddItem "WM_NCMOUSEMOVE" .AddItem "WM_CHAR" .AddItem "WM_USER" End With End Sub Private Sub List1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single) Debug.Print List1.List(List1.ListIndex) End Sub Private Sub List1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single) Call SelectItemUnderCursor(List1.hWnd, _ CLng(X \ Screen.TwipsPerPixelX), _ CLng(Y \ Screen.TwipsPerPixelX)) End Sub |