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[Feature/#275] animated topAppBar #293
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takahirom
merged 5 commits into
DroidKaigi:main
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chattymin:feature/animate-topappbar
Aug 12, 2024
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ba93752
feature: AnimatedTextTopAppBar
chattymin 43cbf69
feature: apply AnimatedTextTopAppBar
chattymin dd9d94e
fix: apply detekt
chattymin 263ef8f
Merge branch 'main' into feature/animate-topappbar
takahirom 2757aed
fix: change animation to fade
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55 changes: 55 additions & 0 deletions
55
...ain/kotlin/io/github/droidkaigi/confsched/designsystem/component/AnimatedTextTopAppBar.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package io.github.droidkaigi.confsched.designsystem.component | ||
|
|
||
| import androidx.compose.animation.core.animateFloatAsState | ||
| import androidx.compose.animation.core.tween | ||
| import androidx.compose.foundation.layout.Box | ||
| import androidx.compose.foundation.layout.RowScope | ||
| import androidx.compose.foundation.layout.WindowInsets | ||
| import androidx.compose.foundation.layout.fillMaxWidth | ||
| import androidx.compose.material3.ExperimentalMaterial3Api | ||
| import androidx.compose.material3.MaterialTheme | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.material3.TopAppBar | ||
| import androidx.compose.material3.TopAppBarColors | ||
| import androidx.compose.material3.TopAppBarDefaults | ||
| import androidx.compose.material3.TopAppBarScrollBehavior | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.ui.BiasAlignment | ||
| import androidx.compose.ui.Modifier | ||
|
|
||
| @OptIn(ExperimentalMaterial3Api::class) | ||
| @Composable | ||
| fun AnimatedTextTopAppBar( | ||
| title: String, | ||
| modifier: Modifier = Modifier, | ||
| navigationIcon: @Composable () -> Unit = {}, | ||
| actions: @Composable RowScope.() -> Unit = {}, | ||
| windowInsets: WindowInsets = TopAppBarDefaults.windowInsets, | ||
| colors: TopAppBarColors = TopAppBarDefaults.topAppBarColors(), | ||
| scrollBehavior: TopAppBarScrollBehavior? = null, | ||
| ) { | ||
| val isTopState = (scrollBehavior?.state?.overlappedFraction ?: 0f) > 0.01f | ||
|
|
||
| TopAppBar( | ||
| title = { | ||
| Box(modifier = Modifier.fillMaxWidth()) { | ||
| val horizontalBias by animateFloatAsState( | ||
| targetValue = if (isTopState) 0f else -1f, | ||
| animationSpec = tween(durationMillis = 300) | ||
| ) | ||
| Text( | ||
| title, | ||
| style = if (isTopState) MaterialTheme.typography.titleMedium else MaterialTheme.typography.headlineSmall, | ||
| modifier = Modifier.align(BiasAlignment(horizontalBias, 0f)) | ||
| ) | ||
| } | ||
| }, | ||
| modifier = modifier, | ||
| navigationIcon = navigationIcon, | ||
| actions = actions, | ||
| windowInsets = windowInsets, | ||
| colors = colors, | ||
| scrollBehavior = scrollBehavior, | ||
| ) | ||
| } | ||
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This component is similar to issue #228. However, this feature requires the use of TopAppBar, while issue #288 requires LargeTopAppBar, making it difficult to use a common component for both. Therefore, I implemented it separately and submitted a PR.