https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/Recent content in From changes to UI behavior on Staticvar LearnHugo -- gohugo.ioen-ushttps://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/01-applier-operations-and-change-application/Mon, 01 Jan 0001 00:00:00 +0000https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/01-applier-operations-and-change-application/Status: The target-tree contract is Durable . The operation classes and execution order below are Version-specific at the pinned snapshot. Outcome Given a pending change, identify which object owns the mutation, where current points, and why a change list is not the UI tree. current is a traversal cursor An Applier<N> owns operations against a target tree. down(child) moves the cursor into a child; up() returns to its parent. insertTopDown, insertBottomUp, remove, move, and clear mutate children of the current node.https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/02-compose-node-to-layout-node/Mon, 01 Jan 0001 00:00:00 +0000https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/02-compose-node-to-layout-node/Status: The create/use/update distinction is Durable . The current helper overloads, UI node properties, and Android construction path are Version-specific . Outcome Given a node-producing composable, read the source-level create/use branch and use a pinned composition fixture to distinguish initial node properties from later updater work. ComposeNode is a small protocol wrapper The pinned ComposeNode first checks that the current applier has the expected type, starts a node group, then chooses createNode(factory) while currentComposer.https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/03-node-updates-measure-layout-and-draw/Mon, 01 Jan 0001 00:00:00 +0000https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/03-node-updates-measure-layout-and-draw/Status: Recomposition, remeasurement, relayout, and redraw are distinct Durable stages. The node-kind invalidation map and queue implementation are Version-specific . Outcome Given a changed ComposeUiNode property or modifier element, predict which downstream phase can be requested—and which phases are not implied. A modifier is a node chain, not only a value LayoutNode.modifier is a property update surface. Once attached, LayoutNode.applyModifier stores the new modifier, calls nodes.updateFrom(modifier), and updates parent data (LayoutNode.https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/04-one-state-change-to-pixels-and-hit-path/Mon, 01 Jan 0001 00:00:00 +0000https://learn.staticvar.dev/courses/jetpack-compose-internals/10-from-changes-to-ui-behavior/04-one-state-change-to-pixels-and-hit-path/Status: The separation of recomposition, remeasurement, relayout, and redraw is Durable . The exact UI and pointer traversal below is Version-specific . Outcome Trace one observed state write without saying “Compose redraws.” Name the boundary at each step and identify which steps may be skipped. Five different events Keep the names separate: recomposition runs invalidated composition code; apply mutates the target tree; remeasurement recalculates sizes; relayout places already-measured nodes; and redraw refreshes pixels or layers.