rainstormmaster的blog
rainstormmaster的blog

      这是个很有意思的问题,通常的思路是先保存数据、再动态添加数据,这里给出的是另外一种方法,即先将该列的列宽设为0,在想办法让用户无法改变该列的列宽,原理我不多说了,看看MSDN,那上面都有^_^。还是给出代码吧:
一个模块,一个窗体:

模块代码:
Option Explicit
Public Type POINTAPI
  X As Long
  Y As Long
End Type
Public Const GWL_WNDPROC  As Long = -4
Public Const GWL_STYLE    As Long = -16
Public Const WM_NOTIFY    As Long = &H4E&
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal wNewWord 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 GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Public Declare Function ScreenToClient Lib "user32" (ByVal hWnd As Long, lpPoint As POINTAPI) As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Any, lParam As Any) As Long
Public Declare Function GetProp Lib "user32" Alias "GetPropA" (ByVal hWnd As Long, ByVal lpString As String) As Long
Public Declare Function SetProp Lib "user32" Alias "SetPropA" (ByVal hWnd As Long, ByVal lpString As String, ByVal hData As Long) As Long


Private Const LVM_FIRST = &H1000
Private Const LVM_GETHEADER = (LVM_FIRST + 31)

Private Type NMHDR
  hWndFrom As Long
  idfrom   As Long
  code     As Long
End Type

Private Type HD_HITTESTINFO
  pt    As POINTAPI
  flags As Long
  iItem As Long
End Type

Private Const HHT_ONHEADER = &H2
Private Const HHT_ONDIVIDER = &H4

Private Const HDM_HITTEST As Long = &H1206

Private Const HDN_FIRST            As Long = -300&
Private Const HDN_ITEMCLICK        As Long = (HDN_FIRST - 2)
Private Const HDN_DIVIDERDBLCLICK  As Long = (HDN_FIRST - 5)
Private Const HDN_BEGINTRACK       As Long = (HDN_FIRST - 6)
Private Const HDN_ENDTRACK         As Long = (HDN_FIRST - 7)
Private Const HDN_TRACK            As Long = (HDN_FIRST - 8)
Private Const HDN_GETDISPINFO      As Long = (HDN_FIRST - 9)
Private Const HDN_BEGINDRAG        As Long = (HDN_FIRST - 10)
Private Const HDN_ENDDRAG          As Long = (HDN_FIRST - 11)
Private Const HDN_ITEMCHANGING     As Long = (HDN_FIRST - 0)
Private Const HDN_ITEMCHANGED      As Long = (HDN_FIRST - 1)
Private Const HDN_ITEMDBLCLICK     As Long = (HDN_FIRST - 3)
Private Const HDN_NM_RCLICK        As Long = -5

' 列标头事件
Public Enum lvHeaderActions
  lvHeaderActionClick = 1
  lvHeaderActionRightClick = 2
  lvHeaderActionDividerDoubleClick = 3
  lvHeaderActionResizeBegin = 4
  lvHeaderActionResizeEnd = 5
  lvHeaderActionChanging = 6
  lvHeaderActionChanged = 7
  lvHeaderActionDragBegin = 8
  lvHeaderActionDragEnd = 9
End Enum

Private RegisteredListViewControls As New Collection

Public Sub RegisterListView(ByVal ListViewControl As ListView)
  
  Call SetProp(ListViewControl.hWnd, "OrigWindowProc", GetWindowLong(ListViewControl.hWnd, GWL_WNDPROC))
 
  Call SetWindowLong(ListViewControl.hWnd, GWL_WNDPROC, AddressOf HandleListViewHeaderMsgs)
 
  Call RegisteredListViewControls.Add(ListViewControl, CStr(ListViewControl.hWnd))
  
End Sub

Public Sub UnregisterListView(ByVal ListViewControl As ListView)
  
  Dim OrigWindowProc As Long
 
  OrigWindowProc = GetProp(ListViewControl.hWnd, "OrigWindowProc")
 
  If (OrigWindowProc <> 0) Then
    Call SetWindowLong(ListViewControl.hWnd, GWL_WNDPROC, OrigWindowProc)
  End If
  
  Call RegisteredListViewControls.Remove(CStr(ListViewControl.hWnd))
  
End Sub

Public Function HandleListViewHeaderMsgs(ByVal ListViewhWnd As Long, ByVal msg As Long, ByVal wp As Long, ByVal lp As Long) As Long
  
  Const EVENT_SUFFIX As String = "_HeaderEvent"
  
  Dim ListViewControl As ListView
  Dim NmHdrMsg        As NMHDR
  Dim PointStruct     As POINTAPI
  Dim HitTestInfo     As HD_HITTESTINFO
  Dim HeaderhWnd      As Long
  Dim HeaderAction    As lvHeaderActions
  Dim CancelMsg       As Boolean
 
  If msg = WM_NOTIFY Then

    HandleListViewHeaderMsgs = CallWindowProc(GetProp(ListViewhWnd, "OrigWindowProc"), ListViewhWnd, msg, wp, lp)
 
    Call CopyMemory(NmHdrMsg, ByVal lp, Len(NmHdrMsg))
   
    HeaderhWnd = SendMessage(ListViewhWnd, LVM_GETHEADER, 0&, ByVal 0&)
   
    If (HeaderhWnd <> 0) Then

      Call GetCursorPos(PointStruct)
      Call ScreenToClient(HeaderhWnd, PointStruct)
     
      HitTestInfo.flags = HHT_ONHEADER Or HHT_ONDIVIDER
      HitTestInfo.pt = PointStruct
     
      Call SendMessage(HeaderhWnd, HDM_HITTEST, 0&, HitTestInfo)

      Select Case NmHdrMsg.code
        Case HDN_ITEMCLICK:       HeaderAction = lvHeaderActionClick
        Case HDN_NM_RCLICK:       HeaderAction = lvHeaderActionRightClick
        Case HDN_DIVIDERDBLCLICK: HeaderAction = lvHeaderActionDividerDoubleClick
        Case HDN_BEGINTRACK:      HeaderAction = lvHeaderActionResizeBegin
        Case HDN_ENDTRACK:        HeaderAction = lvHeaderActionResizeEnd
        Case HDN_ITEMCHANGING:    HeaderAction = lvHeaderActionChanging
        Case HDN_ITEMCHANGED:     HeaderAction = lvHeaderActionChanged
        Case HDN_BEGINDRAG:       HeaderAction = lvHeaderActionDragBegin
        Case HDN_ENDDRAG:         HeaderAction = lvHeaderActionDragEnd
      End Select
     
      If HeaderAction <> 0 Then
           
        On Error Resume Next
       
        Set ListViewControl = RegisteredListViewControls(CStr(ListViewhWnd))
       
        CancelMsg = CallByName(ListViewControl.Parent, ListViewControl.Name & EVENT_SUFFIX, VbCallType.VbMethod, HeaderAction, HitTestInfo.iItem + 1)
       
        On Error GoTo 0
        If CancelMsg Then
          HandleListViewHeaderMsgs = 1
          Exit Function
        End If
       
      End If
     
    End If
 
  End If
 
  HandleListViewHeaderMsgs = CallWindowProc(GetProp(ListViewhWnd, "OrigWindowProc"), ListViewhWnd, msg, wp, lp)
  
End Function

Public Sub ListViewHeaderEventDebugPrint(ByVal ListViewControl As ListView, ByVal Action As lvHeaderActions, ByVal Column As Long)

  Dim msg As String

  Select Case Action
    Case lvHeaderActionClick:               msg = "clicked"
    Case lvHeaderActionRightClick:          msg = "right-clicked"
    Case lvHeaderActionDividerDoubleClick:  msg = "divider dbl-clicked"
    Case lvHeaderActionResizeBegin:         msg = "resize begin"
    Case lvHeaderActionResizeEnd:           msg = "resize end"
    Case lvHeaderActionChanging:            msg = "changing"
    Case lvHeaderActionChanged:             msg = "changed"
    Case lvHeaderActionDragBegin:           msg = "drag begin"
    Case lvHeaderActionDragEnd:             msg = "drag end"
  End Select
   
  Debug.Print ListViewControl.Parent.Name & "." & ListViewControl.Name & ": " & msg & " (col=" & CStr(Column) & ")"

End Sub

窗体上一个listview,两个按钮:
Option Explicit
Dim HideFlag As Boolean, OldWidth As Single

Private Sub Command1_Click()
    HideFlag = True
    OldWidth = ListView1.ColumnHeaders(2).Width
    ListView1.ColumnHeaders(2).Width = 0
End Sub

Private Sub Command2_Click()
    HideFlag = False
    ListView1.ColumnHeaders(2).Width = OldWidth
End Sub

Private Sub Form_Load()
  Command1.Caption = "隐藏第2列"
  Command2.Caption = "显示第2列"
  ListView1.View = lvwReport
  ListView1.ColumnHeaders.Add , , "第1列"
  ListView1.ColumnHeaders.Add , , "第2列"
  ListView1.ColumnHeaders.Add , , "第3列"
  With ListView1.ListItems.Add(, , "d")
    .ListSubItems.Add , , "d1"
    .ListSubItems.Add , , "d2"
  End With
  With ListView1.ListItems.Add(, , "e")
    .ListSubItems.Add , , "e1"
    .ListSubItems.Add , , "e2"
  End With
  With ListView1.ListItems.Add(, , "f")
    .ListSubItems.Add , , "f1"
    .ListSubItems.Add , , "f2"
  End With
   
  Call RegisterListView(ListView1)

End Sub

Private Sub Form_Unload(Cancel As Integer)

  Call UnregisterListView(ListView1)

End Sub

Public Function ListView1_HeaderEvent(ByVal Action As lvHeaderActions, ByVal Column As Long) As Boolean
  If Column = 2 And HideFlag = True Then
    ListView1_HeaderEvent = True
  End If
End Function

 

posted on 2006-01-20 21:00  学剑学诗两不成  阅读(5373)  评论(4编辑  收藏  举报