πͺ Jetpack Compose animation library that allows you to implement animations such as shared element transition. This library support Kotlin Multiplatform (Android, iOS, Desktop, macOS, and js)
Add the dependency below to your module's build.gradle
file:
dependencies {
implementation("com.github.skydoves:orbital:0.4.0")
}
Note: This is an experimental library that demonstrates various animations with Jetpack Compose. Please make sure that your project uses Jetpack Compose
1.5.4
, Compose Compiler1.5.4
, and Kotlin1.9.20
.
For Kotlin Multiplatform, add the dependency below to your module's build.gradle.kts
file:
sourceSets {
val commonMain by getting {
dependencies {
implementation("com.github.skydoves:orbital:$version")
}
}
}
You can implement three kinds of animations with Orbital: Movement, Transformation, and Shared Element Transition.
Basically, you can run animation with Orbital
Composable function, which provides OrbitalScope
that allows you to create animations.
The example below shows how to implement resizing animation with the animateTransformation
extension of the OrbitalScope
.
The rememberContentWithOrbitalScope
allows you to create custom animations such as animateTransformation
on the OrbitalScope
.
You can apply the animateTransformation
animation to specific Composables and customize its AnimationSpec
as seen the below:
val transformationSpec = SpringSpec<IntSize>(
dampingRatio = Spring.DampingRatioMediumBouncy,
stiffness = 200f
)
var isTransformed by rememberSaveable { mutableStateOf(false) }
val poster = rememberContentWithOrbitalScope {
GlideImage(
modifier = if (isTransformed) {
Modifier.size(300.dp, 620.dp)
} else {
Modifier.size(100.dp, 220.dp)
}.animateTransformation(this, transformationSpec),
imageModel = ItemUtils.urls[0],
contentScale = ContentScale.Fit
)
}
Orbital(
modifier = Modifier
.clickable { isTransformed = !isTransformed }
) {
Column(
Modifier.fillMaxSize(),
horizontalAlignment = Alignment.CenterHorizontally,
verticalArrangement = Arrangement.Center
) {
poster()
}
}
The example below shows how to implement movement animation with the animateMovement
extension of the OrbitalScope
.
The rememberContentWithOrbitalScope
allows you to create custom animations such as animateMovement
on the OrbitalScope
.
You can apply the animateMovement
animation to specific Composables and customize its AnimationSpec
as seen the below:
val movementSpec = SpringSpec<IntOffset>(
dampingRatio = Spring.DampingRatioMediumBouncy,
stiffness = 200f
)
var isTransformed by rememberSaveable { mutableStateOf(false) }
val poster = rememberContentWithOrbitalScope {
GlideImage(
modifier = if (isTransformed) {
Modifier.size(360.dp, 620.dp)
} else {
Modifier.size(130.dp, 220.dp)
}.animateMovement(this, movementSpec),
imageModel = ItemUtils.urls[3],
contentScale = ContentScale.Fit
)
}
Orbital(
modifier = Modifier
.clickable { isTransformed = !isTransformed }
) {
if (isTransformed) {
Column(
Modifier.fillMaxSize(),
horizontalAlignment = Alignment.CenterHorizontally,
verticalArrangement = Arrangement.Center
) {
poster()
}
} else {
Column(
Modifier
.fillMaxSize()
.padding(20.dp),
horizontalAlignment = Alignment.End,
verticalArrangement = Arrangement.Bottom
) {
poster()
}
}
}
The example below shows how to implement shared element transition with the animateSharedElementTransition
extension of the OrbitalScope
.
The rememberContentWithOrbitalScope
allows you to create custom animations such as animateSharedElementTransition
on the OrbitalScope
.
You can apply the animateSharedElementTransition
animation to specific Composables and customize its AnimationSpec
.
Also, you can set the different AnimationSpec
s for the movement and transformation as seen the below:
@Composable
private fun OrbitalSharedElementTransitionExample() {
var isTransformed by rememberSaveable { mutableStateOf(false) }
val item = MockUtils.getMockPosters()[3]
val poster = rememberContentWithOrbitalScope {
GlideImage(
modifier = if (isTransformed) {
Modifier.fillMaxSize()
} else {
Modifier.size(130.dp, 220.dp)
}.animateSharedElementTransition(
this,
SpringSpec(stiffness = 500f),
SpringSpec(stiffness = 500f)
),
imageModel = item.poster,
contentScale = ContentScale.Fit
)
}
Orbital(
modifier = Modifier
.clickable { isTransformed = !isTransformed }
) {
if (isTransformed) {
PosterDetails(
poster = item,
sharedElementContent = { poster() },
pressOnBack = {}
)
} else {
Column(
Modifier
.fillMaxSize()
.padding(20.dp),
horizontalAlignment = Alignment.End,
verticalArrangement = Arrangement.Bottom
) {
poster()
}
}
}
}
Note: LookaheadLayout is a very experimental API, so measuring complex Composables might throw exceptions.
The example below shows how to implement shared element transition with multipe items. The basic concept of the usage is the same as the Shared Element Transition example.
var isTransformed by rememberSaveable { mutableStateOf(false) }
val items = rememberContentWithOrbitalScope {
ItemUtils.urls.forEach { url ->
GlideImage(
modifier = if (isTransformed) {
Modifier.size(140.dp, 180.dp)
} else {
Modifier.size(100.dp, 220.dp)
}
.animateSharedElementTransition(movementSpec, transformationSpec)
.padding(8.dp),
imageModel = url,
contentScale = ContentScale.Fit
)
}
}
Orbital(
modifier = Modifier
.fillMaxSize()
.clickable { isTransformed = !isTransformed },
isTransformed = isTransformed,
onStartContent = {
Column(
Modifier.fillMaxSize(),
horizontalAlignment = Alignment.CenterHorizontally,
verticalArrangement = Arrangement.Center
) {
items()
}
},
onTransformedContent = {
Row(
verticalAlignment = Alignment.CenterVertically
) { items() }
}
)
The provided code example illustrates the implementation of shared element transformation (container transform) with a lazy list, such as LazyColumn
and LazyRow
. The OrbitalScope
function initiates a scope in which all layout scopes will be measured and pre-calculated for size and position across all child layouts.
@Composable
fun OrbitalLazyColumnSample() {
val mocks = MockUtils.getMockPosters()
Orbital {
LazyColumn {
items(mocks, key = { it.name }) { poster ->
var expanded by rememberSaveable { mutableStateOf(false) }
AnimatedVisibility(
remember { MutableTransitionState(false) }
.apply { targetState = true },
enter = fadeIn(),
) {
Orbital(modifier = Modifier
.fillMaxWidth()
.clickable {
expanded = !expanded
}
.background(color = poster.color, shape = RoundedCornerShape(10.dp))) {
val title = rememberMovableContentOf {
Column(
modifier = Modifier
.padding(10.dp)
.animateBounds(Modifier),
) {
Text(
text = poster.name,
fontSize = 18.sp,
color = Color.Black,
fontWeight = FontWeight.Bold,
)
Text(
text = poster.description,
color = Color.Gray,
fontSize = 12.sp,
maxLines = 3,
overflow = TextOverflow.Ellipsis,
fontWeight = FontWeight.Bold,
)
}
}
val image = rememberMovableContentOf {
GlideImage(
imageModel = { poster.poster },
component = rememberImageComponent {
CrossfadePlugin()
},
modifier = Modifier
.padding(10.dp)
.animateBounds(
if (expanded) {
Modifier.fillMaxWidth()
} else {
Modifier.size(80.dp)
},
spring(stiffness = Spring.StiffnessLow),
)
.clip(RoundedCornerShape(5.dp)),
imageOptions = ImageOptions(requestSize = IntSize(600, 600)),
)
}
if (expanded) {
Column {
image()
title()
}
} else {
Row {
image()
title()
}
}
}
}
}
}
}
}
You should bear in mind these three aspects:
- Orbital: The
Orbital
function starts a scope, which measures and pre-calculates the layout size and position for all child layouts. Fundamentally, it initiates a reusable Compose node for the given content, which makes all magic things under the hood. You can utilize theOrbital
in nested ways based on your specific scenarios, as illustrated in the code above. - rememberMovableContentOf: Utilize this function to remember a movable Composable function, allowing it to be relocated within the Compose tree. All items intended for transformation should be pre-defined using this function, enabling you to display different content based on various situations. All content defined using
rememberMovableContentOf
must be employed within theOrbital
. - animateBounds: This serves as the delegate of the
Modifier
to compute distinct layout sizes based on various situations. It should be used in conjunction with therememberMovableContentOf
function.
You can implement transitions between composable functions, as you've learned in the previous functions. The sample code below demonstrates how you can implement a shared element transition between screens A and B by defining shared content:
enum class Screen {
A, B;
}
@Composable
fun ScreenTransitionSample() {
Orbital {
var screen by rememberSaveable { mutableStateOf(Screen.A) }
val sizeAnim = spring<IntSize>(stiffness = Spring.StiffnessLow)
val positionAnim = spring<IntOffset>(stiffness = Spring.StiffnessLow)
val image = rememberMovableContentOf {
GlideImage(
imageModel = { MockUtils.getMockPoster().poster },
component = rememberImageComponent {
CrossfadePlugin()
},
modifier = Modifier
.padding(10.dp)
.animateBounds(
modifier = if (screen == Screen.A) {
Modifier.size(80.dp)
} else {
Modifier.fillMaxWidth()
},
sizeAnimationSpec = sizeAnim,
positionAnimationSpec = positionAnim,
)
.clip(RoundedCornerShape(12.dp)),
imageOptions = ImageOptions(requestSize = IntSize(600, 600)),
)
}
val title = rememberMovableContentOf {
Column(
modifier = Modifier
.padding(10.dp)
.animateBounds(
modifier = Modifier,
sizeAnimationSpec = sizeAnim,
positionAnimationSpec = positionAnim
),
) {
Text(
text = MockUtils.getMockPoster().name,
fontSize = 18.sp,
color = Color.Black,
fontWeight = FontWeight.Bold,
)
Text(
text = MockUtils.getMockPoster().description,
color = Color.Gray,
fontSize = 12.sp,
maxLines = 3,
overflow = TextOverflow.Ellipsis,
fontWeight = FontWeight.Bold,
)
}
}
if (screen == Screen.A) {
ScreenA(
sharedContent = {
image()
title()
}) {
screen = Screen.B
}
} else {
ScreenB(
sharedContent = {
image()
title()
}) {
screen = Screen.A
}
}
}
}
@Composable
private fun ScreenA(
sharedContent: @Composable () -> Unit,
navigateToScreenB: () -> Unit
) {
Orbital {
Row(modifier = Modifier
.background(color = Color(0xFFffd7d7))
.fillMaxSize()
.clickable {
navigateToScreenB.invoke()
}) {
sharedContent()
}
}
}
@Composable
private fun ScreenB(
sharedContent: @Composable () -> Unit,
navigateToScreenA: () -> Unit
) {
Orbital {
Column(modifier = Modifier
.background(color = Color(0xFFe3ffd9))
.fillMaxSize()
.clickable {
navigateToScreenA()
}) {
sharedContent()
}
}
}
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Designed and developed by 2022 skydoves (Jaewoong Eum)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.