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[WIP] Add concept of screens to engine #19425
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Description
Implements the concept of a "screen" in the engine, in preparation for multi-window support. This splits out a number of changes from the huge PR that also changes the Dart framework code to understand screens and windows. This PR just introduces screens at the engine level, and doesn't touch the dart code.
In addition, this PR creates a
ScreenMetrics
class to hold the metrics of specific screens separately from theViewportMetrics
. To manage the screen metrics, aScreen
class is also added.[This PR currently contains all of the changes in https://github.com//pull/19652 as well (it's rebased on top of it), but I'll resolve those changes before submitting.]
Related Issues
Tests
PlatformConfiguration
class.Breaking Change