Scroll the scrollbar of the panel automaically

Hi experts,

I'd like to know how to scroll programically the scrollbar of a panel. The panel contains a very long panorama in which I would like the panel to programmically scroll to particular location when user clicks a button. Thanks in advance.
alenwongAsked:
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mzalewskiCommented:
You would need to use javascript to achieve this:

You can set the panel's scrollTop property:
[Javascript]
document.getElementById('<%=panel.ClientID%>').scrollTop = newposition;
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Mike TomlinsonHigh School Computer Science, Computer Applications, and Mathematics TeachersCommented:
WinForms or WebForms?

Is there by chance a control in the Panel that you want to scroll to?
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alenwongAuthor Commented:
My Programming Language is c#, and I am using Visual Studio 2005 and .NET Framework 2.0, thanks
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Mike TomlinsonHigh School Computer Science, Computer Applications, and Mathematics TeachersCommented:
Still not enough info.

Windows application?
or Web application?

Do you just want the scrollbar to move down?

Or do you want to move it so that a particular control is in view?

Or do you want to move it to xxx percentage of the way down?

You might want ScrollableControl.ScrollControlIntoView():
http://msdn2.microsoft.com/en-us/library/system.windows.forms.scrollablecontrol.scrollcontrolintoview(VS.80).aspx

    panel1.ScrollControlIntoView(label1);

Or you can use the SendMessage() API with WM_VSCROLL:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/scrollbars/scrollbarreference/scrollbarmessages/wm_vscroll.asp
An example:
http://weblogs.asp.net/israelio/archive/2004/07/20/188664.aspx
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alenwongAuthor Commented:
It is a Windows Application

I am displaying a image in a picturebox control which is in a panel control. The height of the picturebox was fixed within the panel (so vertical scolling is not needed anyhow), the width of the picturebox will scale according to the ratio of the height of the image to the height of the picturebox, and the image will fit in the size-adjusted picturebox so that horizontal scrolling may required if the width of picturebox is larger than the width of panel.

I would like to know how to scroll the panel xxx percentage of the way to the right by coding. The value would be generated by other part of the program each time so there is no fixed value.

Thanks in advance


based on scale between the height of the picturebox and the image,
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Mike TomlinsonHigh School Computer Science, Computer Applications, and Mathematics TeachersCommented:
Something like...

        private void button1_Click(object sender, EventArgs e)
        {
            ScrollPanel(panel1, 50, 50);
        }

        private void ScrollPanel(Panel pnl, int xPct, int yPct)
        {
            double xFct = Convert.ToDouble(xPct) / Convert.ToDouble(100);
            double yFct = Convert.ToDouble(yPct) / Convert.ToDouble(100);
            pnl.HorizontalScroll.Value = Convert.ToInt32(pnl.HorizontalScroll.Maximum * xFct);
            pnl.VerticalScroll.Value = Convert.ToInt32(pnl.VerticalScroll.Maximum * yFct);
            // don't ask me why...if you just set them like above...
            // ONLY ONE of the scrollbars gets updated on the screen.
            // so I repeated the code below and both scrollbars get updated...   =\
            pnl.HorizontalScroll.Value = Convert.ToInt32(pnl.HorizontalScroll.Maximum * xFct);
            pnl.VerticalScroll.Value = Convert.ToInt32(pnl.VerticalScroll.Maximum * yFct);
        }
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