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Vertical scrollbar with picturebox in VB3

I have a picturebox which takes input from a variable length file (the picturebox height increases as the information is read in from the file, the width always remains the same).  I have to alter the vertical scrollbar after the picturebox is displayed so that all of the information in the picturebox can be viewed.  

The problem is it either scrolls too much past the end of the picturebox, doesn't scroll enough or gets an error because the value is too high.

This is what I have been using;

vscroll1.max = picture1.height - scaleheight
vscroll1.top = -vscroll1.value

plus I have been using many other variations for several hours and can't seem to get the desired results.
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rround
Asked:
rround
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1 Solution
 
rroundAuthor Commented:
Edited text of question
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amebaCommented:
To scroll, here is an example that scrolls verticaly.
To allow better testing, it uses Shape control (it is easy to change size and visualize it). You can use PictureBox.

'Tested in VB5
'Start new project. Form1 is created by default.
'Add TextBox, Shape and VScrollBar to your form.
'Paste this code
Option Explicit

Private Sub Form_Click()
    Dim msg As String
    msg = msg & "" & vbCrLf & vbCrLf
    msg = msg & "Form height: " & Me.ScaleHeight & vbCrLf
    msg = msg & "Shape height " & Shape1.Height & _
                ", top " & Shape1.Top & vbCrLf
    msg = msg & "VScroll Min " & VScroll1.Min & _
                ", Max " & VScroll1.Max & _
                ", Val " & VScroll1.Value & _
                ", LargeChange " & VScroll1.LargeChange & vbCrLf
    Me.CurrentY = 0
    Print msg
End Sub

Private Sub Form_Load()
    ScaleMode = vbPixels ' 3
    Shape1.Shape = vbShapeOval '2
    VScroll1.Width = 17
    VScroll1.TabStop = False
    Text1.Move 28, 4, 41
    Text1.Text = "" 
End Sub

Private Sub Form_Resize()
    Caption = "Enter shape height, >" & Me.ScaleHeight
    VScroll1.Move ScaleWidth - VScroll1.Width, 0, VScroll1.Width, ScaleHeight
    Shape1.Move 0, 0, ScaleWidth - VScroll1.Width
    Adjust
End Sub

Private Sub Text1_Change()
    On Error GoTo hgerr
    Dim hg As Single
    hg = CSng(Text1.Text)
    Shape1.Top = 0
    Shape1.Height = hg ' new height
    Adjust
    Exit Sub
hgerr:
    Debug.Print Err.Description
    Exit Sub
End Sub

Private Sub VScroll1_Change()
    Pos
End Sub

Private Sub VScroll1_Scroll()
    Pos
End Sub

Sub Pos()
    Shape1.Top = -VScroll1.Value
End Sub

Sub Adjust()
    ' set 3 properties of vert scrollbar
    VScroll1.Value = 0
    If Shape1.Height < ScaleHeight Then ' no need to scroll
        VScroll1.Max = 0
    Else
        VScroll1.Max = Abs(ScaleHeight - Shape1.Height)
    End If
    VScroll1.LargeChange = ScaleHeight
End Sub
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chabaudCommented:
VScroll1.Max is limited from -32,768 to 32,767, inclusive.

So you should fix the VScroll1.Min=0 , VScroll1.Max=32000 and compute the values of VScroll1.LargeChange, VScroll1.SmallChange and VScroll1.Value accordingly to your effective size.
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rroundAuthor Commented:
Ameba,

This still doesn't work.  I had already tried most of code in your suggestion but on the larger pictureboxes, it doesn't scroll far enough to reach some of the information, and on smaller pictureboxes, it scrolls too far.

Chabaud,

I think I must be missing something in calculating the effective size.  The Scaleheight is 7215 twips.  Now, If I have a picturebox and its final size is 41885, then I should have:
VScroll1.Max=picture1.height-scaleheight
Picture1.Top =-VScroll1.Value

right?  But using this, the bottom of the picturebox is missing.  When the final size is only 11985 then the scrollbar scrolls way past the bottom of the picturebox.  The problem is, each time my app runs, the size of the picturebox will vary.  What am I missing to make this work?
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amebaCommented:
Why don't you use
    ScaleMode = vbPixels ' 3
Your form scaleheight will be  7215/15 = 481
Your file value 41885 will be 41885/15 = 2792. By deviding by 15 you will not reach scrollbar limit of 32767 too soon.
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rroundAuthor Commented:
Ameba,

This still doesn't work.  I had already tried most of code in your suggestion but on the larger pictureboxes, it doesn't scroll far enough to reach some of the information, and on smaller pictureboxes, it scrolls too far.

Chabaud,

I think I must be missing something in calculating the effective size.  The Scaleheight is 7215 twips.  Now, If I have a picturebox and its final size is 41885, then I should have:
VScroll1.Max=picture1.height-scaleheight
Picture1.Top =-VScroll1.Value

right?  But using this, the bottom of the picturebox is missing.  When the final size is only 11985 then the scrollbar scrolls way past the bottom of the picturebox.  The problem is, each time my app runs, the size of the picturebox will vary.  What am I missing to make this work?
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chabaudCommented:
You must also remove the scrollbar height if you want the bottom of picture to match with max of the scrollbar:

VScroll1.Max=picture1.height-scaleheight-VScroll1.heigth

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rroundAuthor Commented:
Ameba,

This still doesn't work.  I had already tried most of code in your suggestion but on the larger pictureboxes, it doesn't scroll far enough to reach some of the information, and on smaller pictureboxes, it scrolls too far.

Chabaud,

I think I must be missing something in calculating the effective size.  The Scaleheight is 7215 twips.  Now, If I have a picturebox and its final size is 41885, then I should have:
VScroll1.Max=picture1.height-scaleheight
Picture1.Top =-VScroll1.Value

right?  But using this, the bottom of the picturebox is missing.  When the final size is only 11985 then the scrollbar scrolls way past the bottom of the picturebox.  The problem is, each time my app runs, the size of the picturebox will vary.  What am I missing to make this work?
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rroundAuthor Commented:
Thanks Ameba,

I finally got it working....I was having a major brain cramp over this and I knew it should be relatively simple.

Thanks again.

Rob.
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