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docs(overlay): mention the FlexibleConnectedPositionStrategy in the overlay guide (#10842)

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Adds a description of the `FlexibleConnectedPositionStrategy` to the overlay module guide.
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Kristiyan Kostadinov
2018-04-26 00:58:30 -04:00
committed by Andrew Seguin
parent acb0bd09e1
commit 5c91e730d5
1 changed files with 8 additions and 0 deletions
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src/cdk/overlay/overlay.md
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@@ -37,6 +37,14 @@ element on the page. This is commonly used for menus, pickers, and tooltips. Whe
connected strategy, a set of preferred positions is provided; the "best" position will be selected
based on how well the overlay would fit within the viewport.
`FlexibleConnectedPositionStrategy` expands upon the functionality from the
`ConnectedPositionStrategy` by adding more advanced features on top of being able to position an
overlay relative to another element on the page. These features include the ability to have an
overlay become scrollable once its content reaches the viewport edge, being able to configure a
margin between the overlay and the viewport edge, having an overlay be pushed into the viewport if
it doesn't fit into any of its preferred positions, as well as configuring whether the overlay's
size can grow while the overlay is open.
A custom position strategy can be created by implementing the `PositionStrategy` interface.
Each `PositionStrategy` defines an `apply` method that is called whenever the overlay's position
should be updated. A custom position strategy can additionally expose any other APIs necessary as