Amir Hardon
e80df363d2
Generally what this PR is doing is setting up a delegation mechanism for Android's onCreateInputConnection. It works by letting the framework know when an embedded view gets loses focus(within the virtual display), the framework maintains a focus node for each Android view that is kept in sync with the focus state of the embedded view. The TextInputPlugin is extended to allow for 2 type of text clients a "framework client"(what we had before) and a "platform view client". When the AndroidView's focus node in the framework is focused the framework sets a "platform view text client" for the TextInputPlugin, which will result in the TextInputPlugin delegating createInputConnection to the platform view. When a platform view is resized, we are detaching it from a virtual display and attaching it to a new one, as a side affect a platform view might lose an active input connection, to workaround that we "lock" the connection when resizing(by caching it and forcing the cached copy until the resize is done). Additional things worth calling out in this PR: To properly answer which views are allowed for input connection proxying we compare a candidate view's root view to the set of root views of all virtual displays. We also preserve a view's focus state across resizes. Note that this PR only wires text for the io.flutter.view.FlutterView For the new Android embedding some additional plumbing is necessary. Corresponding framework PR: flutter/flutter#33901 flutter/flutter#19718
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