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https://issues.apache.org/jira/browse/PIVOT-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418424#comment-13418424
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Roger Whitcomb commented on PIVOT-796:
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I added an overlay Activity Indicator to 2.0.2 a few weeks ago. How would that
interact with these changes? Do you have a 2.0.2 patch? Thanks....
> TerraFileBrowserSheetSkin: improve user experience with slow drives
> -------------------------------------------------------------------
>
> Key: PIVOT-796
> URL: https://issues.apache.org/jira/browse/PIVOT-796
> Project: Pivot
> Issue Type: Improvement
> Components: wtk-terra
> Affects Versions: 1.1, 1.2, 1.3, 1.4, 1.5, 2.0
> Environment: Windows with Network (SMB-) drives attached and/ or
> special drives like card reader drive letters or virtual cd drives
> Reporter: Thomas Guretzki
> Assignee: Roger Whitcomb
> Priority: Minor
> Labels: patch
> Fix For: 2.1
>
> Attachments: terra_file_browser_skin_RefreshIndicator.patch
>
> Original Estimate: 1.5h
> Remaining Estimate: 1.5h
>
> The current TerraFileBrowserSheetSkin blocks quite often on the UI Thread
> when reading the list of root directory after each directory change, and when
> refreshing the file list of directories on slow drives.
> On Windows, the reason seems to be that reading file attributes of those
> drives (especially isDirectory()) is quite slow. This has a number of
> consequences:
> - Retreiving the list of files on slow drives freezes the UI, and users don't
> necessarily realize that the system is still working
> - Sorting of the retreived files is quite slow, as the FileComparator keeps
> refreshing those attributes
> - After each directory change in the FileBrowser, users have to wait until
> the complete list of drive letters (root directories) has been refreshed.
> This also happens on local drives.
> In response to these problems, I've enhanced TerraFileBrowserSheetSkin in a
> number of ways:
> - FileComparator caches file attributes, leading to approx. 70% decrease in
> file refresh time
> - refreshing the drive letter list uses dedicated tasks, so the user doesn't
> have to wait for the slow drives to respond
> - while drive letters are refreshed, a small ActivityIndicator next to the
> ListButton is displayed
> - while the file list is refreshed, an ActivityIndicator is display instead
> of an empty file list
> - the responsibility of RefreshFileListTask has been extended to include
> sorting the files, as this used to take roundabout 50% of refreshing time and
> to freeze the UI
> - changing the sort while RefreshFileListTask is running is now supported
> The patch, including a few extensions of the bxml file, is attached to this
> ticket
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