使用Windows API在窗體中使用Ms Access淡入淡出

我已經設法使表單正常淡出，但出於某種原因，我的淡入功能無法正常工作。加載過程中形式爲「掛鉤」。它正常加載，然後淡入。而不是在開始時淡化。使用Windows API在窗體中使用Ms Access淡入淡出

這是通過創建一個模塊，然後在表單內編碼完成的。

形式代碼：

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

模塊：

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

任何建議？任何想法爲什麼關閉淡入淡出效果，但加載淡入淡出不？謝謝。

來源

2017-08-24 Tj Keel

嘗試打開事件無法加載「當你第一次打開窗體，按以下順序發生以下事件：打開→裝載→調整大小→激活→當前「 – 4dmonster

是的，我曾嘗試過，但仍然遇到同樣的問題。雖然 –

然後你應該OpenForm與WindowMode = acHidden，並且如果API調用不會使其可見時淡入，設置Me.Visible = True在定時器 – 4dmonster

你應該

移動代碼Load到Open事件
呼叫OpenForm與WindowMode = acHidden
在定時器設定Me.Visible = True

來源

2017-08-30 06:01:53 4dmonster

使用Windows API在窗體中使用Ms Access淡入淡出

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