使MSHFlexGrid支持鼠标滚动

最新推荐文章于 2023-12-18 15:50:57 发布

原创最新推荐文章于 2023-12-18 15:50:57 发布 · 1.7k 阅读

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本文提供了使MSHFlexGrid控件支持滚轮鼠标滚动的方法。通过编写公共模块中的API函数，结合WM_MOUSEWHEEL消息，实现滚轮上翻下页的功能。在表格控件的GotFocus和LostFocus事件中设置和恢复窗口过程，以启用和禁用滚轮滚动。

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将以下代码写到公共模块中

'支持滚轮鼠标API---------------------------------
    Public Const GWL_WNDPROC = (-4)
    Public Const WM_COMMAND = &H111
    Public Const WM_MBUTTONDOWN = &H207
    Public Const WM_MBUTTONUP = &H208
    Public Const WM_MOUSEWHEEL = &H20A

    Public Oldwinproc As Long
    Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As Long, _
                            ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

    Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, _
                            ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

    Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, _
                            ByVal nIndex As Long) As Long
Public Function FlexScroll(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
'支持滚轮的滚动
    Select Case wMsg
    Case WM_MOUSEWHEEL
        Select Case wParam
        Case -7864320 '向下滚
            SendKeys "{PGDN}"
        Case 7864320   '向上滚
            SendKeys "{PGUP}"
        End Select

    End Select
    FlexScroll = CallWindowProc(Oldwinproc, hWnd, wMsg, wParam, lParam)
End Function
'支持滚轮鼠标API---------------------------------

'将下列代码写到表格控件的GotFocus事件中
Private Sub 控件名称_GotFocus()
Oldwinproc = GetWindowLong(Me.hWnd, GWL_WNDPROC)
SetWindowLong Me.hWnd, GWL_WNDPROC, AddressOf FlexScroll
End Sub

'将下列代码写到表格控件的LostFocus事件中
Private Sub 控件名称_LostFocus()
SetWindowLong Me.hWnd, GWL_WNDPROC, Oldwinproc
End Sub