73.txt

VB文章集（含API、窗口、数据库、多媒体、系统、文件、等等）

建立可滚动的视区   
     
下面的范例演示如何建立可滚动的视区以滚动显示比视区大的图象
Private Sub HScroll1_Change()
Picture2.Left = -HScroll1.Value
End Sub

Private Sub VScroll1_Change()
Picture2.Top = -VScroll1.Value
End Sub

Private Sub Form_Resize()

With Picture1
.Height = Form1.Height
.Width = Form1.Width
End With

Picture1.Move 0, 0, ScaleWidth - VScroll1.Width, _
ScaleHeight - HScroll1.Height

Picture2.Move 0, 0

With HScroll1
.Top = Picture1.Height
.Left = 0
.Width = Picture1.Width
.Max = Picture2.Width - Picture1.Width
End With

With VScroll1
.Top = 0
.Left = Picture1.Width
.Height = Picture1.Height
.Max = Picture2.Height - Picture1.Height
End With

VScroll1.Visible = (Picture1.Height < Picture2.Height)
HScroll1.Visible = (Picture1.Width < Picture2.Width)

End Sub

Private Sub Form_Load()

Picture1.Move 0, 0, ScaleWidth - VScroll1.Width, _
ScaleHeight - HScroll1.Height

With Picture2
.AutoSize = True
.Picture = LoadPicture("d:\vbcode\examples\demos\banner.jpg")
.Move 0, 0
End With

With HScroll1
.Top = Picture1.Height
.Left = 0
.Width = Picture1.Width
End With

With VScroll1
.Top = 0
.Left = Picture1.Width
.Height = Picture1.Height
End With

HScroll1.Max = Picture2.Width - Picture1.Width
VScroll1.Max = Picture2.Height - Picture1.Height
' HScroll1.LargeChange = HScroll1.Max / 10
' VScroll1.LargeChange = VScroll1.Max / 10

VScroll1.Visible = (Picture1.Height < Picture2.Height)
HScroll1.Visible = (Picture1.Width < Picture2.Width)

End Sub