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Change Log

Unreleased

0.6.0 - 2023-08-10

New:

  • Support for specifying custom Compose compiler versions. This will allow you to use the latest version of Redwood with newer versions of Kotlin than it explicitly supports.

    See the README for more information.

  • LazyList can now be programmatically scrolled through its ScrollItemIndex parameter.

  • Pull-to-refresh indicator color on LazyList is now customizable through pullRefreshContentColor parameter.

Changes:

  • Many public types have been migrated away from data class to regular classes with equals/hashCode/toString(). If you were relying on destructuring or copy() for these types you will need to migrate to doing this manually.

Fix:

  • The emoji search browser sample no longer crashes on first load.
  • Lots of rendering and performance fixes for UIKit version of LazyList
    • Only measure items which are visible in the active viewport.
    • Remove some default item spacing imposed by the backing UICollectionViewFlowLayout.
    • Share most of the internal bookkeeping logic with the Android implementations for consistency and correctness.
    • Placeholders are now correctly sized along the main axis.

This version works with Kotlin 1.9.0 by default.

0.5.0 - 2023-07-05

This release marks Redwood's "beta" period which provides slightly more stability guarantees than before. All future releases up to (but NOT including) 1.0 will have protocol and service compatibility with older versions. In practice, what this means is that you can use Redwood 0.6 (and beyond) to compile and deploy Treehouse guest code which will run inside a Treehouse host from Redwood 0.5.

Redwood still reserves the right to make binary- and source-incompatible changes within the host code or within the guest code.

New:

  • The relevant tags and names from your schema will now automatically be tracked in an API file and changes will be validated to be backwards-compatible. The redwoodApiGenerate Gradle task will generate or update the file, and the redwoodApiCheck task will validate the current schema as part of the check lifecycle task.
  • width, height, and size modifiers allow precise control over widget size within Redwood layout.
  • Preliminary support for rememberSaveable within Treehouse guest code with persistence only available on Android hosts.

Changes:

  • The flexbox implementation has changed from being a Kotlin port of the Google's Java flexbox layout to using Facebook's Yoga library.
  • LazyList now has arguments for margin and cross-axis alignment (verticalAlignment for LazyRow, horizontalAlignment for LazyColumn)
  • Remove the ability to use custom implementations of LazyList. Any missing functionality from the built-in versions should be filed as a feature request.
  • The command-line tools (codegen, lint, schema) are now uploaded to Maven Central as standalone zip files in addition to each regular jar artifact for use with non-Gradle build systems.

Fixed:

  • RTL layout direction is now supported by the Compose UI and View-based implementations of Redwood layout.

This version only works with Kotlin 1.8.22.

0.4.0 - 2023-06-09

New:

  • Experimental support for refresh indicators on LazyRow and LazyColumn via refreshing boolean and onRefresh lambda. These are experimental because we expect refresh support to migrate to some kind of future support for widget decorators so that it can be applied to any widget.
  • DisplayLinkClock is available for iOS and MacOS users of Redwood. (Treehouse already had a frame clock for iOS).
  • A WidgetValue (or List<WidgetValue>) produced from the generated testing function's awaitSnapshot() can now be converted to a SnapshotChangeList which can be serialized to JSON. That JSON can then later be deserialized and applied to a TreehouseView to recreate a full view hierarchy from any state. This is useful for unit testing widget implementations, screenshot testing, and more.
  • Widget implementations can implement the ChangeListener interface to receive an onEndChanges() callback which occurs after all property or event lambda changes in that batch. This can help reduce thrashing in response to changes to multiple properties or event lambdas at once.
  • LazyRow and LazyColumn now support a placeholder composable slot which will be used with Treehouse when a new item is displayed but before its content has loaded. Additionally, the size of these widgets can now be controlled through width and height constraints.

Changes:

  • LayoutModifier has been renamed to Modifier.

  • UI primitives like Dp, Density, and Margin have moved from Treehouse into the Redwood runtime (in the app.cash.redwood.ui package).

  • HostConfiguration has moved from Treehouse into the Redwood runtime (in the app.cash.redwood.ui package) and is now called UiConfiguration.

  • Composables running in Treehouse now run on a background thread on iOS. Previously they were running on the main thread. Interactions with UIKit still occur on the main thread.

  • RedwoodContent function for hosting a Redwood composable within Compose UI has moved into a new redwood-composeui artifact as it will soon require a Compose UI dependency.

  • The generated testing function now returns the value which was returned from the testing lambda.

    Before:

    suspend fun ExampleTester(body: suspend TestRedwoodComposition.() -> Unit)

    Now:

    suspend fun <R> ExampleTester(body: suspend TestRedwoodComposition.() -> R): R

  • The Redwood and Treehouse frame clocks now send actual values for the frame time instead of 0.

Fixed:

  • Widgets which accept nullable lambdas for events now receive an initial null value when no lambda is set. Previously a null would only be seen after a non-null lambda.
  • Reduce binary impact of each widget's composable function by eliminating a large error string generated by the Kotlin compiler for an error case whose occurrence was impossible.
  • The iOS implementation of Row, Column, Spacer, and UIViewChildren now react to size and child view changes more accurately according to UIKit norms.

This version only works with Kotlin 1.8.20.

0.3.0 - 2023-05-15

New:

  • Support for testing Composables with new test-specific code generation. Use the 'app.cash.redwood.generator.testing' plugin to generate a lambda-accepting entrypoint function (such as ExampleTester()). Inside the lambda you can await snapshots of the values which would be bound to the UI widgets at that time.
  • Redwood Layout now contains a Spacer which can be used to create negative space separately from padding (which otherwise disappears when the item disappears).
  • The host's safe area insets are now included in HostConfiguration. Note that these are global values which should only be applied when a view is known to be occupying the full window size.
  • Use the host's native frame rate to trigger recomposition inside of Treehouse. Pending snapshot changes are also required for recomposition to occur.

Changes:

  • Widgets are now created, populated, and attached to the native view hierarchy in a different order than before. Previously widget was created, attached to its parent, and then its properties were all set followed by any language modifiers. Now, the widget is created, all of its properties and layout modifiers are set, and then it is added to its parent. Additionally, widgets are added to their parents in a bottom-up manner. Code like Row { Column { Text } } will see Text be added to Column before Column is added to `Row.
  • 'redwood-treehouse' module has been split into '-shared', '-guest', and '-host' modules to more cleanly delineate where each is used. "Host" is the native application and "guess" is code running inside the Zipline JS VM.
  • Schema dependencies are not longer parsed when loading a schema. Instead, a JSON representation is loaded from the classpath which contains the parsed structure of the dependency. As a result, the module which contains the schema files must apply the 'app.cash.redwood.schema' plugin in order to create this JSON.
  • Redwood Layout's Padding type is now called Margin.
  • Both Redwood's own API as well as code generated from your schema is now annotated with @ObjCName to create better-looking APIs in Objective-C (and Swift).
  • The @Deprecated annotation on a widget or its properties will now propagate into the generated Composable and widget interface.
  • Event types are no longer always nullable. They will now respect the nullability in the schema.
  • Layout modifiers are now generated into a 'modifier' subpackage.

Fixed:

  • Redwood Layout Constraints are now correctly propagated into HTML.

This version only works with Kotlin 1.8.20.

0.2.1 - 2023-01-31

Changed:

  • Do not use a ScrollView/HorizontalScrollView as the parent container for View-based Row and Column display when the container is not scrollable (the default). Use a FrameLayout instead.

Fixed:

  • Actually publish the redwood-treehouse-composeui artifact.

This version only works with Kotlin 1.7.20.

0.2.0 - 2023-01-30

New:

  • redwood-layout-dom module provides HTML implementations of Row and Column.
  • Lazy layout's schema artifacts are now published and can be used by other projects.
  • Expose concurrentDownloads parameter for TreehouseApp.Factory. The default is 8.
  • Add moduleLoadStart and moduleLoadEnd events to Treehouse's EventListener.

Changed:

  • Compile with Android API 33.
  • Counter sample now uses shared Row and Column layouts rather than its own unspecified one.
  • JSON serialization on the Compose-side of Treehouse is now faster and emits dramatically less code than before.
  • Create a dedicated CoroutineScope for each TreehouseView. When a view leaves, its coroutines can now be immediately canceled without waiting for anything on the application-side.
  • TreehouseLauncher is now called TreehouseApp.Factory. Additionally, when you create() a TreehouseApp from a factory you must also call start() for it to actually start.
  • Use platform-specific collections types in JS for the Compose-side of Treehouse. This is faster, more memory-efficient, and produces less code.
  • Update to Zipline 0.9.15.

Fixed:

  • Do not expose Gradle Configurations created by our plugin. This ensures they are not candidates for downstream modules to match against when declaring a dependency on a project using the plugin.
  • Change when the Treehouse FrameClock is closed to avoid crashing on updates.

This version only works with Kotlin 1.7.20.

0.1.0 - 2022-12-23

Initial release.

This version only works with Kotlin 1.7.20.