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Bug 197008

Summary:

Missing notifications with sychronized scrolling of 2 grids (one without scrollbar)

Product:

z_Archived

Reporter:

David Császár <csaszar>

Component:

Nebula

Assignee:

Chris Gross <cgross>

Status:

RESOLVED DUPLICATE

QA Contact:

Severity:

normal

Priority:

CC:

tom.schindl

Version:

unspecified

Target Milestone:

---

Hardware:

OS:

Windows XP

Whiteboard:

Attachments:

Description	Flags
snippet demonstrating the bug	none
new example	none

Description David Császár

2007-07-18 14:45:29 EDT

Build ID: I20070621-1340

Steps To Reproduce:
1. we have 2 grids, where a slave grid is connected to the master via setlVerticalScrollBarProxy
2. scroll sync is fine via the scrollbars
3. when scrolling the master by traversing a column with cursor keys the slave is not sychronized (no events fire)
4. when traversing the slave the master's scrollbar is updated, but not the master's content (getTopIndex doesn't change)


More information:

Comment 1 Chris Gross

2007-08-20 15:11:07 EDT

Hi David,

Can you attach a snippet of what you're trying to do.  The scrollbar proxies weren't meant for this use case but may work.  The lack of a horz proxy may account for 3.  

-Chris

Comment 2 David Császár

2007-08-21 00:12:04 EDT

Created attachment 76507 [details]
snippet demonstrating the bug

my current workaround is included, just uncomment and re-run

Comment 3 Chris Gross

2007-08-21 11:06:42 EDT

Created attachment 76544 [details]
new example

David - here is a different technique to accomplish the synchronized scrolling.  The scrollbar proxies shouldn't really be used for this kind of thing.  Let me know if this example works for you.

Comment 4 David Császár

2007-08-21 12:16:35 EDT

it doesn't work for me.
in my case the left grid doesn't have scrollbars at all (SWT.NONE).
so i'm not able to attach scroll event handlers to this grid.

Comment 5 Chris Gross

2007-08-21 13:43:48 EDT

Then you can just remove the scrollbar listener for that grid.  The remaining code should work.

Comment 6 David Császár

2007-08-21 13:57:16 EDT

it doesn't.
obviously the line
grid1.setTopIndex(grid2.getTopIndex());
has no effect if grid1 has no scrollbar.

grid1 (without bar) also doesn't scroll when the grid cursor reaches the bottom.

Comment 7 Chris Gross

2007-08-21 14:30:48 EDT

Oh.. right.  I didn't think about that.  Then the code you have seems fine.  The scrollbar proxies aren't intended for things like this but it seems to work ok.  I would change your workaround to use selection listeners rather than traverse listeners but otherwise it seems ok.  

Are there more issues or were you just asking for an easier way to support this?

Comment 8 David Császár

2007-08-21 18:19:16 EDT

an easy (standard, recommended) way would be nice.
in fact my 1st (naive, derived from some other snippet) try looked a lot like the one you suggested.

so maybe this is the root cause for this bug, and comment 0 just a symptom.

apart from this the workaround is completely achieving what i want.

Comment 9 Chris Gross

2007-08-22 14:44:41 EDT

Ok.  I'll leave this item open until there is an easier way to achieve this but for now your workaround is the only solution.

Comment 10 Thomas Schindl

2009-04-24 08:43:57 EDT

Is the real feature you need the one in no #166089? I'll close this if you don't agree please reopen.

*** This bug has been marked as a duplicate of bug 166089 ***