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Subject:
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Resizing controls in a ScrollableForm Layout Event
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Posted By:
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decyclone
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Post Date:
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8/7/2006 9:44:15 AM
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Hi friends,
I was working on a form that listed a set of images(up to around 500 images).
I wanted the form to be scrollable and resize images to maintain their width to the form's width and set the height to match the 4:3 ratio and change them on layout event.
So i wrote the following code.
Class ABC
Inherits Form
Private Sub ABC_Layout(ByVal sender As Object, ByVal e As System.Windows.Forms.LayoutEventArgs) Handles Me.Layout
Dim W As Integer, H As Integer, M As Integer
Dim i As Integer = 0
M = 20 ' Margin
W = ClientSize.Width - (M * 2)
H = CInt(W * 3D / 4D) ' 500
For Each Ctrl As Control In Me.Controls
Ctrl.Location = New Point(M + AutoScrollPosition.X, (i * (H + M)) + AutoScrollPosition.Y)
Ctrl.Size = New Size(W, H)
i += 1
Next
End Sub
Private Sub ABC_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim W As Integer, H As Integer, M As Integer
M = 20 ' Margin
W = ClientSize.Width - (M * 2)
H = CInt(W * 3D / 4D) '500
Me.AutoScroll = True
Me.AutoScrollMargin = New Size(M, M)
For i As Integer = 0 To (500 - 1)
Dim NewPicture As New PictureBox
NewPicture.Location = New Point(M + AutoScrollPosition.X, (i * (H + M)) + AutoScrollPosition.Y)
NewPicture.Size = New Size(W, H)
NewPicture.BorderStyle = BorderStyle.FixedSingle
NewPicture.Name = "Picture #" & (i + 1).ToString
NewPicture.ImageLocation = "Image" & (i + 1).ToString & ".jpg"
NewPicture.SizeMode = PictureBoxSizeMode.StretchImage
Me.Controls.Add(NewPicture)
Next
End Sub
End Class
the problem is (wether i set AutoScrollMinSize manually or not),
the images overlap each other after some point.
that is in my test, images are around 1024x768 resolution,
so after around image # 45 in all the images Control.Location.Y property remains the same(or what).
so after i scroll down to end of vertical scroll, i get image# 45. All other after it are hidden behind it. I hope u guys can understand it.
If u can't get the problem, u simply paste the given code in IDE and first guess the results and then see the actual results.
Please help me.
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