IScrollInfo tutorial part IV

re: IScrollInfo tutorial part IV

Houman — Tue, 19 Dec 2006 00:36:16 GMT

Hi,

This is a great series. I really enjoyed going through it.

How would I apply this to controls (such as ListView) that maintain thier own ScrollViewer? Can I intercept the scrollViewer's events? ListView doesn't expose events for LineDown, LineUp, etc.

Thanks

Houman

re: IScrollInfo tutorial part IV

Ivolved — Mon, 15 Jan 2007 01:47:40 GMT

I think this series is to help people implement their own controls that support IScrollInfo.

re: IScrollInfo tutorial part IV

kyaw — Sat, 29 Sep 2007 07:10:19 GMT

how come you don't link to previous post.

re: IScrollInfo tutorial part IV

prasanthi surineni — Mon, 08 Oct 2007 12:41:22 GMT

I have one Problem with ScrollViewer,

i.e

1.If Iam using a ScrollViewer inside a treeview say t1 , if I focus on scrollviewer and scroll the content , t1 content is scrolling fine,

2. if I scroll the content inside t1 , t1 content is scrolling fine.

But the Problem Is :

If I place the scrollviewer outside of the treeview t1 , and if I scroll the content keeping the focus on the selected treeviewitem ,

Now the Content is not scrolling ???

I need your assistance in solving this problem ...

re: IScrollInfo tutorial part IV

Prasanthi Surineni — Mon, 08 Oct 2007 12:46:05 GMT

This is very helpful series ....

re: IScrollInfo tutorial part IV

xiard — Thu, 20 Dec 2007 21:36:32 GMT

I'll add my kudos as well. I'm working on a control that will require some custom scrolling across a host of subcontrols working in tandem, and this was a fantastic starting point.

I'd also recommend looking at http://www.wiredprairie.us/journal/2007/04/photoscroll_the_worst_named_wp.html for an example of an app that implements a custom scroll bar. It contains some useful insights as well.

Thanks!!

David Cater

re: IScrollInfo tutorial part IV

grominc — Thu, 24 Jul 2008 23:18:19 GMT

Ben, thank you for this article, it is very helpful.

But your code contains a bug. Please replace the SetVerticalOffset method to following:

public void SetVerticalOffset(double offset)

{

_offset.Y = Math.Max(0, Math.Min(_extent.Height - _viewport.Height, Math.Max(0, offset)));

if (_owner != null) _owner.InvalidateScrollInfo();

_trans.Y = -_offset.Y;

}

re: IScrollInfo tutorial part IV

grominc — Thu, 24 Jul 2008 23:22:42 GMT

Oops! Correction for my previous feedback:

public void SetVerticalOffset(double offset)

{

_offset.Y = Math.Max(0, Math.Min(_extent.Height - _viewport.Height, Math.Max(0, offset)));

if (_owner != null) _owner.InvalidateScrollInfo();

_trans.Y = -_offset.Y;

InvalidateMeasure();

}