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When KFileItems get removed from the model it is temporary possible
that the pending items are still part of the KFileItemModelRolesUpdater
while they have already been removed from the model (this happens
in the context during the signal itemsRemoved() gets emitted).
BUG: 287642
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Before this commit, no previews were generated if the icon size was the
same with and without previews.
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m_pendingItems and m_pendingInvisibleItems might contain already
removed items. Take care to delete them before starting to resolve
the roles.
Thanks to Frank Reininghaus for finding out the root-cause.
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The overall time for creating previews is faster the more items
are passed to KIO::previewJob() in parallel instead of passing
e.g. only 100 items once and start several KIO::previewJobs
sequentially.
However in the worst case KIO::previewJob() might
block the application for several seconds if the
MIME-type of the passed KFileItems are unknown and e.g. 10000 items
are forwarded.
So KFileItemModelRolesUpdater will now take care to resolve as many
MIME-types as possible until a timeout is reached and will only pass
those items to KIO::previewJob().
For huge image folders, where the MIME-type can be determined very
fast, this means that the overall time for creating previews will
decrease without blocking the application. For "worst case" directories
where resolving the MIME-type can get very expensive this approach
assures no blocking of the user-interface although the overall time
until all previews are generated might slightly increase.
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Dolphin 2.0 will get a new view-engine with the
following improvements:
- Better performance
- Animated transitions
- No clipped filenames due to dynamic item-sizes
- Grouping support for all view-modes
- Non-rectangular selection areas
- Simplified code for better maintenance
More details will be provided in a blog-entry during
the next days.
Please note that the code is in a very
early alpha-stage and although the most tricky parts
have been implemented already very basic things like
drag and drop or selections have not been pushed yet.
Those things are rather trivial to implement but this
still will take some time.
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