Ms Access 淡入淡出 Windows API

Question

我已经设法让我的表单正确淡出，但由于某种原因，我的淡入无法正常工作。加载期间的形式 "hitches"。它正常加载，然后淡入。而不只是在开始时淡入。

这是通过创建一个模块，然后在表单中编写代码来完成的。

表单代码：

Option Compare Database
Dim gintC

Private Sub Form_Load()
Me.TimerInterval = 2
FadeForm Me, Fadezero, 1, 5
End Sub

Private Sub Form_Timer()
If IsEmpty(gintC) Then
    FadeForm Me, Fadein, 1, 15
End If
gintC = 1
Me.TimerInterval = 0
End Sub

Private Sub Form_Close()
FadeForm Me, Fadeout, 1, 255
End Sub

模块：

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 dwNewLong As Long) As Long

Public Declare Function SetLayeredWindowAttributes Lib "user32" _
(ByVal hWnd As Long, ByVal crey As Byte, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long

Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)

Public Const GWL_EXSTYLE = (-20)

Public Const WS_EX_LAYERED = &H80000

Public Const WS_EX_TRANSPARENT = &H20&

Public Const LWA_ALPHA = &H2&

'Enum for determining the direction of the fade.

Public Enum FadeDirection

   Fadein = -1

   Fadeout = 0

   Fadezero = 1

   SetOpacity = 1

End Enum

Public Sub FadeForm(frm As Form, Optional Direction As FadeDirection = FadeDirection.Fadein, _
Optional iDelay As Integer = 0, Optional StartOpacity As Long = 5)

   Dim lOriginalStyle As Long
   Dim iCtr As Integer
   'You can only set a form's opacity if it's Popup property = True.
   If (frm.PopUp = True) Then
       'Get the form window’s handle, and remember its original style.
       lOriginalStyle = GetWindowLong(frm.hWnd, GWL_EXSTYLE)
       SetWindowLong frm.hWnd, GWL_EXSTYLE, lOriginalStyle Or WS_EX_LAYERED
       'If the form’s original style = 0, it hasn’t been faded since it was opened.
       'To get fading to work, we have to set its style to something other than zero.
       If (lOriginalStyle = 0) And (Direction <> FadeDirection.SetOpacity) Then
          'Recursively call this same procedure to set the value.
          FadeForm frm, SetOpacity, , StartOpacity
       End If
       'Depending on the direction of the fade...
       Select Case Direction
          Case FadeDirection.Fadezero
              iCtr = StartOpacity
              SetLayeredWindowAttributes frm.hWnd, 0, CByte(iCtr), LWA_ALPHA
          Case FadeDirection.Fadein
              'Just in case.
              If StartOpacity < 1 Then StartOpacity = 1
              'Fade the form in by varying its opacity
              'from the value supplied in 'StartOpacity'
              'to 255 (completely opaque).
              For iCtr = StartOpacity To 255 Step 1
                 SetLayeredWindowAttributes frm.hWnd, 0, CByte(iCtr), LWA_ALPHA
                 'Process any outstanding events.
                 DoEvents
                 'Wait a while, so the user can see the effect.
                 Sleep iDelay
              Next
          Case FadeDirection.Fadeout
              'Just in case.
              If StartOpacity < 6 Then StartOpacity = 255
              'Fade the form out by varying its opacity
              'from 255 to 1 (almost transparent).
              For iCtr = StartOpacity To 1 Step -1
                 SetLayeredWindowAttributes frm.hWnd, 0, CByte(iCtr), LWA_ALPHA
                 'Process any outstanding events.
                 DoEvents
                 'Wait a while, so the user can see the effect.
                 Sleep iDelay
              Next
          Case Else 'FadeDirection.SetOpacity.
              'Just in case.
              Select Case StartOpacity
                 Case Is < 1: StartOpacity = 1
                 Case Is > 255: StartOpacity = 255
              End Select
              'Set the form's opacity to a specific value.
              SetLayeredWindowAttributes frm.hWnd, 0, CByte(StartOpacity), LWA_ALPHA
                 'Process any outstanding events.
                 DoEvents
                 'Wait a while, so the user can see the effect.
                 Sleep iDelay
       End Select
   Else
       'The form’s Popup property MUST = True
       DoCmd.Beep
       MsgBox "The form's Popup property must be set to True.", vbOKOnly & vbInformation, "Cannot fade form"
   End If

End Sub

有什么建议吗？知道为什么关闭淡入淡出有效，但加载淡入淡出却不起作用吗？谢谢

Answer 1

你应该

将代码从 Load 移动到 Open 事件
用 WindowMode = acHidden 调用 OpenForm
在定时器

Me.Visible = True

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