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Jetpack Compose RatingBar (alpha12)
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| import androidx.compose.foundation.Canvas | |
| import androidx.compose.foundation.layout.* | |
| import androidx.compose.foundation.shape.GenericShape | |
| import androidx.compose.runtime.Composable | |
| import androidx.compose.ui.Modifier | |
| import androidx.compose.ui.draw.clip | |
| import androidx.compose.ui.geometry.Offset | |
| import androidx.compose.ui.geometry.Size | |
| import androidx.compose.ui.graphics.Color | |
| import androidx.compose.ui.graphics.Path | |
| import androidx.compose.ui.graphics.SolidColor | |
| import androidx.compose.ui.tooling.preview.Preview | |
| import androidx.compose.ui.unit.Dp | |
| import androidx.compose.ui.unit.dp | |
| import com.jefisu.movieapp.ui.theme.LocalSpacing | |
| import kotlin.math.cos | |
| import kotlin.math.sin | |
| @Composable | |
| fun RatingBar( | |
| rating: Float, | |
| modifier: Modifier = Modifier, | |
| height: Dp = 20.dp, | |
| color: Color = Color.Yellow | |
| ) { | |
| Row( | |
| modifier = Modifier | |
| .height(height) | |
| .wrapContentSize() | |
| .then(modifier), | |
| horizontalArrangement = Arrangement.spacedBy(8.dp) | |
| ) { | |
| (1..5).forEach { step -> | |
| val stepRating = when { | |
| rating > step -> 1f | |
| step.rem(rating) < 1 -> rating - (step - 1f) | |
| else -> 0f | |
| } | |
| RatingStar(stepRating, color) | |
| } | |
| } | |
| } | |
| @Composable | |
| private fun RatingStar( | |
| rating: Float, | |
| ratingColor: Color = Color.Yellow, | |
| backgroundColor: Color = Color.Gray | |
| ) { | |
| val starPath = { size: Float -> | |
| Path().apply { | |
| val outerRadius: Float = size / 1.8f | |
| val innerRadius: Double = outerRadius / 2.5 | |
| var rot: Double = Math.PI / 2 * 3 | |
| val cx: Float = size / 2 | |
| val cy: Float = size / 20 * 11 | |
| var x: Float = cx | |
| var y: Float = cy | |
| val step = Math.PI / 5 | |
| moveTo(cx, cy - outerRadius) | |
| repeat(5) { | |
| x = (cx + cos(rot) * outerRadius).toFloat() | |
| y = (cy + sin(rot) * outerRadius).toFloat() | |
| lineTo(x, y) | |
| rot += step | |
| x = (cx + cos(rot) * innerRadius).toFloat() | |
| y = (cy + sin(rot) * innerRadius).toFloat() | |
| lineTo(x, y) | |
| rot += step | |
| } | |
| close() | |
| } | |
| } | |
| val starShape = GenericShape { size, _ -> | |
| addPath(starPath(size.height)) | |
| } | |
| BoxWithConstraints( | |
| modifier = Modifier | |
| .fillMaxHeight() | |
| .aspectRatio(1f) | |
| .clip(starShape) | |
| ) { | |
| Canvas(modifier = Modifier.size(maxHeight)) { | |
| drawRect( | |
| brush = SolidColor(backgroundColor), | |
| size = Size( | |
| height = size.height * 1.4f, | |
| width = size.width * 1.4f | |
| ), | |
| topLeft = Offset( | |
| x = -(size.width * 0.1f), | |
| y = -(size.height * 0.1f) | |
| ) | |
| ) | |
| if (rating > 0) { | |
| drawRect( | |
| brush = SolidColor(ratingColor), | |
| size = Size( | |
| height = size.height * 1.1f, | |
| width = size.width * rating | |
| ) | |
| ) | |
| } | |
| } | |
| } | |
| } | |
| @Preview | |
| @Composable | |
| fun RatingBarPreview() { | |
| Box(modifier = Modifier.padding(8.dp)) { | |
| RatingBar( | |
| rating = 3.8f, | |
| height = 25.dp | |
| ) | |
| } | |
| } |
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