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Since Dolphin 2.0, we have stored the selected items in a QSet<int>,
which is neither space-efficient nor particularly fast when inserting
many items which are in a consecutive range.
This commit replaces the QSet<int> by a new class "KItemSet", which
stores the items in a sorted list of ranges. For each range, we only
store the first index and the length of the range, so we need a lot
less memory for most common selection patterns, and we also save quite
a few CPU cycles in many situations, because adding an item to the
KItemSet will in many cases not need a memory allocation at all, and
it's particularly easy when inserting sorted items into the KItemSet in
a row.
KItemSet contains a minimal subset of QSet's API which makes it
suitable as a drop-in replacement for our needs. It also has iterators,
such that the items can be iterated through easily, also with foreach.
One advantage of KItemSet compared to QSet<int> is that the items are
always iterated through in ascending order.
REVIEW: 113488
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Also factor out the code that transforms a sorted list of ints to a
KItemRangeList. This removes some duplicated code from KFileItemModel.
Note that overriding operator<<() in KItemRangeList was necessary
because it's not a typedef for QList<KItemRange>, but a class derived
from that now, and some code fails to compile if the return type of
that function is QList<KItemRange> and not KItemRangeList.
REVIEW: 112728
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Up to now no indicator-branches have been drawn when showing a tree. The patch
fixes this so that that the style-dependent branches are drawn.
The main part of the patch is the implementation of
KItemListView::updateSiblingsInformation(). Most of the other changes are
related due to an internal renaming of the expansionsLevel-role to
expandedParentsCount and some related cleanups.
BUG: 290276
FIXED-IN: 4.8.1
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The following functionality from Dolphin 1.x has
been ported to the new view-engine:
- Allow expanding/collapsing of items
- Automatically select the current item
- Context menu for items
Related improvements to the view-engine:
- Make the expanding/collapsing interface already accessible
in the base classes KItemModelBase and KItemListView. If
no expanding/collapsing is supported at all by derived models
(which is usually the default case) simply not reimplementing
those 3 methods is sufficient and it does not introduce an
additional complexity like in QAbstractItemModel/QModelIndex.
- Automatically handle the expanding/collapsing in KItemListController.
This also includes the key-handling, which is quite special for
expandable items.
- Don't let KItemListView automatically scroll to the current item
if the current item got changed. The automatic scrolling should
only be done if the current item has been changed by the user.
Hence this functionality has been moved to the KItemListController
which currently only triggers the automatic scrolling if the current
item has been changed by the keyboard (we might extend the usecases
later if required).
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- Rename setCategorizedSorting() to setGroupedSorting()
- Change the model interface to allow enabling/disabling grouping
without the need to declare a role (the sort role will be taken).
- Add dummy group role implementation in KFileItemModel
The grouping code itself requires some cleanups and might crash
at the moment or lead to weird layouts.
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Changing the sort order and enabling/disabling the
"Sort Folders First" option works now.
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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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