Decouple PlatformViewsController from FlutterView.
Instead of getting a FlutterView instance, depend on the specific interfaces required by
PlatformViewsController (BinaryMessenger, TextureRegistry, and Context).
This allows using PlatformViewsControlling in the flutter/embedding
code.
The default WindowManager implementation in Android's Presentation is
delegating addView/removeView/updateViewLayout calls to the global
WindowManager.
This can result in a crash when an embedded view is trying to e.g show a
PopupWindow.
This change adds a custom WindowManager that overrides
addView (and removeView/updateViewLayout) and adds the view to the
presentation's view tree.
Note that views might keep a reference to the window manager which
might be an issue when we move a view from one virtual display to
another (due to a resize). For this reason when re-sizing we are not
creating a new window manager for the new presentation, but updating the
window manager's references to be relevant for the new presentation and
re-use it.
This allows the framework to know that a frame with the resized view is
ready and to behave deterministically to workaround the jank issue
described in flutter/flutter/19572
* Flush all embedded Android view on hot restart.
Adds an OnEngineRestarted method to PlatformView, this is currently only
implemented for Android where we need to use it for embedded views.
* review comments followup
* rename to OnPreEngineRestart, call before Clone
When the FlutterView's window loses focus Flutter cannot bring up the
keyboard (so e.g tapping on text fields doesn't work).
This workaround makes sure that Flutter text fields are working but
unfortunately now the embedded Android view cannot bring up the keyboard
as it's window is not focused.
Submitting this until as a stop gap while we're trying to figure out if
it's possible to allow both windows to bring up the keyboard.
Each platform view created (by a plugin supplied factory) is attached to
a virtual display.
The virtual displays are controlled by VirtualDisplayController objects.
The PlatformViewsController maintains a mapping from a platform view's
id to its VirtualDisplayController, which allows it to operate on the
virtual display for a given platform view ID when asked so over the
method channel.
This is using API level 20 APIs, on lower API levels all platform views
method channel calls are noops.
We can make this work on API 19 with some refactoring to the
TextureRegistry (allow the engine Java code to recycle a texture entry
id).
This CL also adds a platform view id parameter to the
PlatformViewFactory#create() method. This allows plugins to route
platform channel messages to specific instances of a platform view.
TBD in future CLs:
* Forward touch events to the platform views.
* Support accessibility for platform views.
flutter/flutter#19030
To keep the scope of this CL as small of possible I'm leaving the actual
implementation of the platform view mechanics to a following CL.
This CL introduces:
* A PlatformViewsController class which will be responsible for creating,
resizing, and disposing platform views.
* A PlatformViewRegistry which is exposed through the PluginRegistry
and allows plugins to register factories for platform views.
Android plugin code will add support for a new platform view type by
implementing PlatformViewFactory, and registering a factory with the
registry, e.g:
```java
registrar.platformViewRegistry().registerViewFactory(
'webview',
new FlutterWebViewFactory()
);
```
On the Dart side, the framework will ask the engine to create new
platform views by sending a create message over the platformviews method
channel with the unique platform view type id, dimensions, and a unique
id allocated by the framework for the new platform view instance.
The platformviews method channel is also used for resizing and disposing
platform views.
* Revert "Roll dart sdk to e6d7d67f4b35556805dd083fed15bf3ed41f7e33. (#5165)"
This reverts commit 9e4c5d0e1f9daf0c46fdc7e5d1e81ce9c36b65c4.
* Revert "Enables system chrome customization on Android M/O and greater (#5112)"
This reverts commit f2db5dfd30f12407acab57f04acc8af7c6158891.
We have a use for this for the internal messaging plugin. Instead of rolling our own, it made sense to add it here especially since it has the mirror functionality (wrap).
