【转】让窗体由小到大逐渐显示出来

本文转自：http://www.hbjjrb.com/Jishu/vb/200704/9849.html

注意，单引号（'）后的为英文注释
Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function Rectangle Lib "gdi32" (ByVal hdc As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Sub Explode(Newform As Form, Increment As Integer)
Dim Size As RECT ' setup form as rect type
GetWindowRect Newform.hwnd, Size
Dim FormWidth, FormHeight As Integer ' establish dimension variables
FormWidth = (Size.Right - Size.Left)
FormHeight = (Size.Bottom - Size.Top)
Dim TempDC
TempDC = GetDC(ByVal 0&) ' obtain memory dc for resizing
Dim Count, LeftPoint, TopPoint, nWidth, nHeight As Integer ' establish resizing variables
For Count = 1 To Increment ' loop to new sizes
nWidth = FormWidth * (Count / Increment)
nHeight = FormHeight * (Count / Increment)
LeftPoint = Size.Left + (FormWidth - nWidth) / 2
TopPoint = Size.Top + (FormHeight - nHeight) / 2
Rectangle TempDC, LeftPoint, TopPoint, LeftPoint + nWidth, TopPoint + nHeight ' draw rectangles to build form
Next Count
DeleteDC (TempDC) ' release memory resource
End Sub

 

Private Sub Form_Load()
Explode Me, 4000 ' open this form by number of desired increment
End Sub