commit | 0f44bf63f0fd0b9dc883ac65297dd115f3ae9ac5 | [log] [tgz] |
---|---|---|
author | Yu Han <yuzhehan@chromium.org> | Wed Apr 08 21:58:18 2020 |
committer | Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> | Wed Apr 08 23:01:14 2020 |
tree | 40faa3cfa7aee782c2a8f835803c51273c373537 | |
parent | 86ee6a2162d259a45dc5490b54840c367019c01e [diff] |
Adds ability for slot to preserve order of its manually assigned nodes. Prior to this CL, the ordering of the manually assigned nodes is not preserved. Nodes were assigned in tree-order. In addition, assignment is not absolute. A slotable node can be assign to multiple slots, and where it appears is when the assigned slot first appear in a tree-order traversal, not the last slot the node is assigned to. This CL does two things. One, the order of manually assigned node is preserved. Two, assignment is absolute. The implementation uses a HeapHashMap, candidate_assigned_slot_map_, to keep track of assignment node -> slot. It uses this map during node assignment to find if another assigned slot exists. When found, the node is removed from the previously assigned slot. Preserving the ordering of manually assigned nodes is done in HTMLSlotElement::UpdateManuallyAssignedNodesOrdering(). This is called at the end of SlotAssignment::RecalcAssignment(). RecalcAssignment() walks the ShadowHost's children in tree-order, so the assigned node could be out of order from how these nodes were assigned. I thought about making a separate function for manually assigned nodes, looping though assigned nodes instead. But I decided against it at this point due to the complexity of the recalc function. For Reference: point 1 in this comment is addressed by this CL. https://github.com/whatwg/html/issues/3534#issuecomment-537802687 Bug: 869308 Change-Id: Idc45cb593313b00f13cd5f29df8972bfe246ecce Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2103403 Reviewed-by: Mason Freed <masonfreed@chromium.org> Reviewed-by: Hayato Ito <hayato@chromium.org> Commit-Queue: Yu Han <yuzhehan@chromium.org> Cr-Commit-Position: refs/heads/master@{#757574}
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