https://bugs.kde.org/show_bug.cgi?id=471495
Bug ID: 471495
Summary: [Feature request] KselectionPoxyModel
SubTreesWithoutRoots add NearestFolder mode to avoid
an empty view
Classification: Frameworks and Libraries
Product: frameworks-kitemmodels
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: general
Assignee: kdelibs-b...@kde.org
Reporter: ondrej.pop...@gmail.com
Target Milestone: ---
To start with, I can not change the "Component" field from "general" to
anything else such as "KSelectionProxyModel" in this form.
SUMMARY
Hi, I am migrating my own implementation of SubTreesWithoutRoots to the
KSelectionProxyModel SubTreesWithoutRoots filtermode. However, the way I have
implemented this, in case only item(s) without children are selected, to set
the rootindex to their parents instead. In this way the childless item will
show up in the secondary view together with all its siblings. I figured that
this mode is more useful than having a completely empty secondary view because
an empty secondary view is not very useful so you might do something else with
it instead.
Now, KSelectionProxyModel does not do this in the SubTreesWithoutRoots
filtermode and shows an empty secondary view. I looked over the sourcecode
whether I could enhance this, but it is quite complicated so I figured the
easiest way for me to make this work with the KSelectionProxyModel is to
subclass it and add a proxy on top of the selection model of the view and feed
that to the KSelectionProxyModel. The proxy will then "monitor" (with the help
of the appropriate signals) the state of the selection model of the view, and
mirror it unless only childless items are selected in the SubTreesWithoutRoots
filtermode. In that case the proxy will select their parents instead.
I figured further to call this mode SubTreesWithoutRootsNearestFolder. So in
case an item is selected that has children this item is then the nearest
folder, otherwise when it is childless, its parent will be the nearest folder.
So, this will probably work for me, and I thought to let you know about this
may you be interested. Maybe to add this proxy to the KSelectionProxyModel so
it will mirror the selection model of the view by default, and let the users
customize it further?
In any case, have a nice day!
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