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fix(drag-drop): connected drop zones not working inside shadow root #16899

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crisbeto
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Fixes not being able to drop into a connected drop list when using ShadowDom view encapsulation. The issue comes from the fact that we use elementFromPoint to figure out whether the user's pointer is over a drop list. When the element is inside a shadow root, calling elementFromPoint on the document will return the shadow root.

These changes fix the issue by calling elementFromPoint from the shadow root instead.

Fixes #16898.

@crisbeto crisbeto added P2 The issue is important to a large percentage of users, with a workaround target: patch This PR is targeted for the next patch release labels Aug 27, 2019
@googlebot googlebot added the cla: yes PR author has agreed to Google's Contributor License Agreement label Aug 27, 2019
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LGTM

@jelbourn jelbourn added pr: lgtm action: merge The PR is ready for merge by the caretaker labels Aug 29, 2019
Fixes not being able to drop into a connected drop list when using `ShadowDom` view encapsulation. The issue comes from the fact that we use `elementFromPoint` to figure out whether the user's pointer is over a drop list. When the element is inside a shadow root, calling `elementFromPoint` on the `document` will return the shadow root.

These changes fix the issue by calling `elementFromPoint` from the shadow root instead.

Fixes angular#16898.
@crisbeto crisbeto force-pushed the 16898/drag-drop-connected-shadow-root branch from a55a133 to b6bd3d6 Compare August 31, 2019 08:15
@jelbourn jelbourn merged commit 6009211 into angular:master Sep 9, 2019
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Angular DropList with cdkDropListConnectedTo not working in ShadowDom
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