ComposeFoundationFlags

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() {
        ComposeFoundationFlags.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.ComposeFoundationFlags {
    public static boolean SomeFeatureEnabled return false
}

Summary

Public properties
Boolean

Selecting flag to enable Drag Gesture "Pick-up" on drag gesture detectors.
Cmn
Boolean

Selecting flag to enable the change in Fling Propagation behavior in nested Scrollables.
Cmn
Boolean

We have removed the implicit graphicsLayer from BasicText.
Cmn

Public properties

DragGesturePickUpEnabled

Cmn
Added in 1.8.0-alpha06
var DragGesturePickUpEnabled: Boolean

Selecting flag to enable Drag Gesture "Pick-up" on drag gesture detectors. This also applies to Draggables and Scrollables which use gesture detectors as well. Any parent drag detector will continue to monitor the event stream until the gesture terminates (all pointers are lifted), if a child gives up an event, the parent gesture detector will "pick-up" and continue the gesture until all pointers are up.

NewNestedFlingPropagationEnabled

Cmn
Added in 1.8.0-alpha06
var NewNestedFlingPropagationEnabled: Boolean

Selecting flag to enable the change in Fling Propagation behavior in nested Scrollables. When this is true, an ongoing fling that causes the scrollable container to hit the bounds will be cancelled so the next scrollable in the chain can take over and fling with velocity left. We are doing a flagged roll out of this behavior change. A node that is detached during a fling will be treated as a node that hit its bounds, that is, it will cancel its fling and propagate the remaining velocity through onPostFling.

RemoveBasicTextGraphicsLayerEnabled

Cmn
Added in 1.8.0-alpha06
var RemoveBasicTextGraphicsLayerEnabled: Boolean

We have removed the implicit graphicsLayer from BasicText. This also affects the Text composable in material modules.

This change ideally improves the initial rendering performance of BasicText but it may have negative effect on recomposition or redraw since BasicTexts draw operations would not be cached in a separate layer.