No user visible changes expected, these are just the internal API preparations.
Modifies the Drop API for views so that tree-views can choose to insert items
before, after and into other items.
Note: While there is support for drag-tooltips that can explain how an item
will be inserted, there is no drawing yet like in the Outliner, that indicates
if an item is inserted before, after or into. There is some work on that but
that can be done separately.
Changes:
- Removes `AbstractViewDropTarget` that was shared between tree- and
grid-views, and adds `AbstractTreeViewDropTarget` and
`AbstractGridViewDropTarget`. The tree-view needs specialized handling now,
and although they could share some code still, it's not worth having another
level of inheritance.
- Modifies the drop-target API to use `DragInfo` which contains more info about
the dragging operation than just the `wmDrag`.
- Adds `determine_drop_location()` to the `DropTargetInterface` which drop
targets can use to determine when dropping means inserting before, after or
into.
- Store the block and region in the view. This is needed unfortunately but
shouldn't be an issue since the tree view is recreated on redraws, together
with the block.
- Various smaller tweaks and additions to views as needed.
TODO (outside scope of this change): Increase row height so there is no gap
between tree view items, but keep things visually the same otherwise. This
reduces flickering while dragging.
Pull Request: https://projects.blender.org/blender/blender/pulls/109825
No user visible changes expected.
This function was added in 86b2cf4574 as a more type safe and more
convenient way of setting button callbacks. So use it for simple cases.
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
