ComposeUiFlags

This is a collection of flags which are used to guard against regressions in some of the "riskier" refactors or new feature support that is added to this module. These flags are always "on" in the published artifact of this module, however these flags allow end consumers of this module to toggle them "off" in case this new path is causing a regression.

These flags are considered temporary, and there should be no expectation for these flags be around for an extended period of time. If you have a regression that one of these flags fixes, it is strongly encouraged for you to file a bug ASAP.

Usage:

In order to turn a feature off in a debug environment, it is recommended to set this to false in as close to the initial loading of the application as possible. Changing this value after compose library code has already been loaded can result in undefined behavior.

class MyApplication : Application() {
    override fun onCreate() {
        ComposeUiFlags.SomeFeatureEnabled = false
        super.onCreate()
    }
}

In order to turn this off in a release environment, it is recommended to additionally utilize R8 rules which force a single value for the entire build artifact. This can result in the new code paths being completely removed from the artifact, which can often have nontrivial positive performance impact.

-assumevalues class androidx.compose.runtime.ComposeUiFlags {
    public static int isRectTrackingEnabled return false
}

Summary

Public properties
Boolean

Selecting flag to enable the change new onPostFling nested scroll behavior for ongoing flings.
Cmn
Boolean

With this flag on, during layout we will do some additional work to store the minimum bounding rectangles for all Layout Nodes.
Cmn
Boolean

With this flag on, the new semantic version of Autofill will be enabled.
Cmn

Public properties

NewNestedScrollFlingDispatchingEnabled

Cmn
Added in 1.8.0-alpha06
var NewNestedScrollFlingDispatchingEnabled: Boolean

Selecting flag to enable the change new onPostFling nested scroll behavior for ongoing flings. If a nested scroll node is removed from the tree before sending the onPostFling callback, we will hold on to the next node in the tree so we have a handle to send the information after the fling finish/is cancelled.

isRectTrackingEnabled

Cmn
Added in 1.8.0-alpha06
var isRectTrackingEnabled: Boolean

With this flag on, during layout we will do some additional work to store the minimum bounding rectangles for all Layout Nodes. This introduces some additional maintenance burden, but will be used in the future to enable certain features that are not possible to do efficiently at this point, as well as speed up some other areas of the system such as semantics, focus, pointer input, etc. If significant performance overhead is noticed during layout phases, it is possible that the addition of this tracking is the culprit.

isSemanticAutofillEnabled

Cmn
Added in 1.8.0-alpha06
var isSemanticAutofillEnabled: Boolean

With this flag on, the new semantic version of Autofill will be enabled. Prior to the semantics refactoring, this will introduce significant overhead, but can be used to test out the new Autofill APIs and features introduced.