Interacting with Composable Canvas
summary
Builds an animated, interactive bar chart using Jetpack Compose Canvas that actually works end to end: drawing with drawRect and drawLine, using nativeCanvas drawText because compose text is experimental, detecting touches with pointerInput + awaitFirstDown and hit-testing against precomputed bar X ranges, animating selection with Animatable-driven selection and two-state (permanent + temporary) logic so two highlights can coexist, and validating behavior with Compose UI tests that simulate down/move/up gestures; reports better performance than thousands of Boxes.
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chapters (7)
- 0:00Start
- 6:33Android view Canvas vs Composable canvas
- 17:27Pointer input
- 21:33Simple selection
- 30:40Final result
- 32:07Testing
- 35:59Final thoughts
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