Migrate Compose touch and input snippets

[pengzhi-cb]

Code snippets are for:

1. (8 snippets) https://developer.android.com/develop/ui/compose/touch-input/pointer-input/migrate-swipeable
2. (3 snippets) https://developer.android.com/develop/ui/compose/touch-input/scroll/nested-scroll-modifiers

Total: 11 code snippets (11 Kotlin and 0 XML) across 2 pages.

Resource migration notes

1. Three untagged supporting XML layout files (view_in_compose_nested_scroll_interop.xml, list_item.xml, and fragment_bottom_sheet.xml) were added to compose/snippets/src/main/res/layout/ because the tagged Kotlin snippets in NestedScrollModifiers.kt reference their resource symbols (R.layout.view_in_compose_nested_scroll_interop, R.id.main_list, R.layout.list_item, R.layout.fragment_bottom_sheet, and R.id.compose_view) and will not compile without them.
2. All three layout file names and view IDs were forced directly by the inflate(...) and findViewById(...) calls in the guide page code blocks.

List of modifications

1. Migrate-swipeable page: Added type argument and constructor parameter <DragValue>(initialValue = DragValue.Start) to SwipeableState in MySwitchState (android_compose_touchinput_pointerinput_migrate_swipeable_state_legacy) so the class compiles.
2. Migrate-swipeable page: Replaced placeholder ... inside AnchoredDraggableState(...) and DraggableAnchors { ... } with // [START_EXCLUDE] ... // [END_EXCLUDE] blocks supplying required constructor parameters and anchor definitions in android_compose_touchinput_pointerinput_migrate_swipeable_state_anchored, android_compose_touchinput_pointerinput_migrate_swipeable_access_offset, android_compose_touchinput_pointerinput_migrate_swipeable_anchors_update, android_compose_touchinput_pointerinput_migrate_swipeable_positional_threshold_fraction, android_compose_touchinput_pointerinput_migrate_swipeable_positional_threshold_dp, and android_compose_touchinput_pointerinput_migrate_swipeable_velocity_threshold.
3. Migrate-swipeable page: Added .toInt() to state.requireOffset() inside IntOffset(...) in android_compose_touchinput_pointerinput_migrate_swipeable_access_offset, android_compose_touchinput_pointerinput_migrate_swipeable_anchors_constructor, and android_compose_touchinput_pointerinput_migrate_swipeable_anchors_update because IntOffset requires Int coordinates while requireOffset() returns Float, and fixed the mismatched closing brace } to ) on Box(...) in android_compose_touchinput_pointerinput_migrate_swipeable_access_offset.
4. Migrate-swipeable page: Added val density = LocalDensity.current and wrapped DraggableAnchors { ... } in with(density) { ... } in android_compose_touchinput_pointerinput_migrate_swipeable_anchors_constructor so Dp.toPx() compiles, and hid required AnchoredDraggableState constructor parameters inside // [START_EXCLUDE silent] ... // [END_EXCLUDE] in android_compose_touchinput_pointerinput_migrate_swipeable_anchors_constructor.
5. Nested-scroll-modifiers page: Added // [START_EXCLUDE silent] title = {}, // [END_EXCLUDE] inside TopAppBar(...) and replaced the trailing // ... comment in NestedScrollInteropAdapter with // [START_EXCLUDE] override fun getItemCount(): Int = items.size // [END_EXCLUDE] in android_compose_touchinput_scroll_nested_scroll_interop_compose_parent so the required TopAppBar parameter and RecyclerView.Adapter.getItemCount() implementation compile.
6. Nested-scroll-modifiers page: Replaced non-existent android.R.layout.list_item with R.layout.list_item in ViewInComposeNestedScrollInteropExample (android_compose_touchinput_scroll_view_in_compose_interop) (Required for the Kotlin snippet to compile) and formatted scrollable(...) arguments across lines.
7. Nested-scroll-modifiers page: Added untagged supporting XML layout resources view_in_compose_nested_scroll_interop.xml, list_item.xml, and fragment_bottom_sheet.xml under compose/snippets/src/main/res/layout/ (Required for the Kotlin snippet to compile).

Snippets not migrated

1. Migrate-swipeable page:
   1. None (all 8 hardcoded code blocks on the guide page were migrated).
2. Nested-scroll-modifiers page:
   1. None (all 3 remaining hardcoded code blocks on the guide page were migrated; lines 295–301 already reference touchinput_gestures_nested_scroll_interop.xml on GitHub via {% includecode %}).

[snippet-bot]

Here is the summary of changes.

You are about to add 11 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:41, tag android_compose_touchinput_pointerinput_migrate_swipeable_state_legacy
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:48, tag android_compose_touchinput_pointerinput_migrate_swipeable_state_anchored
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:64, tag android_compose_touchinput_pointerinput_migrate_swipeable_access_offset
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:99, tag android_compose_touchinput_pointerinput_migrate_swipeable_anchors_constructor
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:133, tag android_compose_touchinput_pointerinput_migrate_swipeable_anchors_update
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:169, tag android_compose_touchinput_pointerinput_migrate_swipeable_positional_threshold_fraction
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:185, tag android_compose_touchinput_pointerinput_migrate_swipeable_positional_threshold_dp
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/pointerinput/MigrateSwipeable.kt:202, tag android_compose_touchinput_pointerinput_migrate_swipeable_velocity_threshold
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/scroll/NestedScrollModifiers.kt:58, tag android_compose_touchinput_scroll_nested_scroll_interop_compose_parent
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/scroll/NestedScrollModifiers.kt:141, tag android_compose_touchinput_scroll_view_in_compose_interop
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/scroll/NestedScrollModifiers.kt:171, tag android_compose_touchinput_scroll_bottom_sheet_interop

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[kkuan2011]

can you import the m3 versions of Text and TopAppBar?

[kkuan2011]

Looks like we're using deprecated APIs in this file, so not sure if we should migrate those snippets