Updated on 2026-08-14
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Tangem
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package com.tangem.core.ui.components.bottomsheets.modal
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import android.content.res.Configuration
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import androidx.compose.foundation.background
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import androidx.compose.foundation.layout.*
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import androidx.compose.foundation.rememberScrollState
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import androidx.compose.foundation.shape.RoundedCornerShape
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import androidx.compose.foundation.verticalScroll
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import androidx.compose.material3.*
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import androidx.compose.material3.SheetValue.Expanded
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import androidx.compose.runtime.*
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.draw.clip
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import androidx.compose.ui.graphics.Brush
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.graphics.vector.ImageVector
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import androidx.compose.ui.graphics.vector.rememberVectorPainter
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import androidx.compose.ui.platform.LocalConfiguration
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import androidx.compose.ui.platform.LocalDensity
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import androidx.compose.ui.res.vectorResource
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import androidx.compose.ui.text.style.TextAlign
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import androidx.compose.ui.tooling.preview.Preview
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import androidx.compose.ui.unit.dp
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import com.tangem.core.ui.R
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import com.tangem.core.ui.components.*
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import com.tangem.core.ui.components.bottomsheets.TangemBottomSheetConfig
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import com.tangem.core.ui.components.bottomsheets.TangemBottomSheetConfigContent
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import com.tangem.core.ui.components.bottomsheets.internal.ModalBottomSheetWithBackHandling
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import com.tangem.core.ui.components.bottomsheets.internal.collapse
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import com.tangem.core.ui.res.LocalBottomSheetAlwaysVisible
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import com.tangem.core.ui.res.TangemTheme
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import com.tangem.core.ui.res.TangemThemePreview
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import com.tangem.core.ui.utils.WindowInsetsZero
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/**
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* Modal bottom sheet with [content], [footer] and optional [title].
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*
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* Maximum height of sheet is 80% screen height
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*
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* [Show in Figma](https://www.figma.com/design/09KKG4ZVuFDZhj8WLv5rGJ/%F0%9F%9A%A7-App-experience?node-id=3254-61208&t=vixa7id6ggALcxfF-4)
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*/
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@Composable
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inline fun <reified T : TangemBottomSheetConfigContent> TangemModalBottomSheetWithFooter(
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config: TangemBottomSheetConfig,
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containerColor: Color = TangemTheme.colors.background.primary,
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skipPartiallyExpanded: Boolean = true,
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noinline onBack: (() -> Unit)? = null,
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crossinline title: @Composable BoxScope.(T) -> Unit = {},
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crossinline content: @Composable (T) -> Unit,
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noinline footer: @Composable (BoxScope.(T) -> Unit),
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) {
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val isAlwaysVisible = LocalBottomSheetAlwaysVisible.current
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if (isAlwaysVisible) {
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PreviewModalBottomSheetWithFooter<T>(
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config = config,
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containerColor = containerColor,
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title = title,
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content = content,
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footer = footer,
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skipPartiallyExpanded = skipPartiallyExpanded,
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)
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} else {
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DefaultModalBottomSheetWithFooter<T>(
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config = config,
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containerColor = containerColor,
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title = title,
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content = content,
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footer = footer,
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onBack = onBack,
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skipPartiallyExpanded = skipPartiallyExpanded,
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)
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}
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}
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@Composable
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@OptIn(ExperimentalMaterial3Api::class)
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inline fun <reified T : TangemBottomSheetConfigContent> DefaultModalBottomSheetWithFooter(
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config: TangemBottomSheetConfig,
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containerColor: Color,
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skipPartiallyExpanded: Boolean = true,
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noinline onBack: (() -> Unit)? = null,
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crossinline title: @Composable BoxScope.(T) -> Unit,
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crossinline content: @Composable (T) -> Unit,
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noinline footer: @Composable (BoxScope.(T) -> Unit),
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) {
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var isVisible by remember { mutableStateOf(value = config.isShown) }
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val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = skipPartiallyExpanded)
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if (isVisible && config.content is T) {
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BasicModalBottomSheetWithFooter<T>(
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config = config,
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sheetState = sheetState,
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containerColor = containerColor,
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title = title,
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onBack = onBack,
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content = content,
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footer = footer,
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)
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}
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LaunchedEffect(key1 = config.isShown) {
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if (config.isShown) {
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isVisible = true
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} else {
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sheetState.collapse { isVisible = false }
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}
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}
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}
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@Composable
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@OptIn(ExperimentalMaterial3Api::class)
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inline fun <reified T : TangemBottomSheetConfigContent> PreviewModalBottomSheetWithFooter(
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config: TangemBottomSheetConfig,
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containerColor: Color,
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skipPartiallyExpanded: Boolean = true,
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crossinline title: @Composable BoxScope.(T) -> Unit,
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crossinline content: @Composable (T) -> Unit,
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noinline footer: @Composable BoxScope.(T) -> Unit,
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) {
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BasicModalBottomSheetWithFooter<T>(
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config = config,
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sheetState = SheetState(
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skipPartiallyExpanded = skipPartiallyExpanded,
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initialValue = Expanded,
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density = LocalDensity.current,
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),
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onBack = null,
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containerColor = containerColor,
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title = title,
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content = content,
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footer = footer,
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)
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}
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@Suppress("LongParameterList", "LongMethod")
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@OptIn(ExperimentalMaterial3Api::class)
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@Composable
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inline fun <reified T : TangemBottomSheetConfigContent> BasicModalBottomSheetWithFooter(
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config: TangemBottomSheetConfig,
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sheetState: SheetState,
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containerColor: Color,
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noinline onBack: (() -> Unit)? = null,
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crossinline title: @Composable BoxScope.(T) -> Unit,
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crossinline content: @Composable (T) -> Unit,
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noinline footer: @Composable (BoxScope.(T) -> Unit),
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modifier: Modifier = Modifier,
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) {
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val model = config.content as? T ?: return
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val bsContent: @Composable ColumnScope.() -> Unit = {
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val maxHeight = LocalConfiguration.current.screenHeightDp * MODAL_SHEET_MAX_HEIGHT
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val initial = 0
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val scrollState = rememberScrollState(initial = initial)
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Column(
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modifier = Modifier
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.systemBarsPadding()
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.padding(horizontal = 8.dp, vertical = 8.dp)
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.clip(TangemTheme.shapes.roundedCornersLarge)
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.background(containerColor)
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.heightIn(max = maxHeight.dp)
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.fillMaxWidth(),
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) {
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Box(modifier = Modifier.fillMaxWidth()) {
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title(model)
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}
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// Title bottom shadow(elevation) while content is scrolling
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if (scrollState.value != initial) {
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Box(
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modifier = Modifier
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.fillMaxWidth()
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.height(2.dp)
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.background(
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brush = Brush.verticalGradient(
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colors = listOf(
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TangemTheme.colors.background.secondary.copy(alpha = 0.9F),
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Color.Transparent,
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),
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),
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),
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)
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}
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Box(modifier = Modifier.weight(1f, fill = false)) {
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val bottomBarHeight = with(LocalDensity.current) {
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WindowInsets.systemBars.getBottom(density = this).toDp()
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}
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Column(
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modifier = Modifier
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.verticalScroll(state = scrollState)
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.padding(bottom = TangemTheme.dimens.spacing76 + bottomBarHeight),
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) {
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content(model)
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}
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if (scrollState.canScrollForward && scrollState.maxValue != Int.MAX_VALUE) {
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BottomFade(
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modifier = Modifier.align(Alignment.BottomCenter),
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backgroundColor = TangemTheme.colors.background.primary,
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)
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}
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Box(
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modifier = Modifier
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.fillMaxWidth()
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.align(Alignment.BottomCenter),
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) {
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footer(model)
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}
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}
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}
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}
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if (onBack != null) {
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ModalBottomSheetWithBackHandling(
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modifier = modifier,
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onDismissRequest = config.onDismissRequest,
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sheetState = sheetState,
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containerColor = Color.Transparent,
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shape = TangemTheme.shapes.roundedCornersLarge,
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contentWindowInsets = { WindowInsetsZero },
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onBack = onBack,
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dragHandle = null,
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content = bsContent,
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)
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} else {
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ModalBottomSheet(
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modifier = modifier,
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onDismissRequest = config.onDismissRequest,
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sheetState = sheetState,
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containerColor = Color.Transparent,
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shape = TangemTheme.shapes.roundedCornersLarge,
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contentWindowInsets = { WindowInsetsZero },
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dragHandle = null,
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content = bsContent,
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)
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}
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}
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// region Preview
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@Preview(showBackground = true, widthDp = 360, heightDp = 800)
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@Preview(showBackground = true, widthDp = 360, heightDp = 800, uiMode = Configuration.UI_MODE_NIGHT_YES)
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@Composable
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private fun TangemModalBottomSheetWithFooter_Preview() {
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TangemThemePreview {
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TangemModalBottomSheetWithFooter<TangemBottomSheetConfigContent.Empty>(
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config = TangemBottomSheetConfig(
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isShown = true,
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onDismissRequest = {},
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content = TangemBottomSheetConfigContent.Empty,
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),
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title = { TangemModalBottomSheetTitle(endIconRes = R.drawable.ic_close_24, onEndClick = {}) },
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content = {
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Column(
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modifier = Modifier.padding(start = 16.dp, end = 16.dp, bottom = 16.dp),
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horizontalAlignment = Alignment.CenterHorizontally,
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) {
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Icon(
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modifier = Modifier
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.size(56.dp)
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.clip(RoundedCornerShape(100))
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.background(TangemTheme.colors.icon.informative.copy(alpha = 0.1f))
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.padding(12.dp),
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painter = rememberVectorPainter(
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ImageVector.vectorResource(R.drawable.ic_alert_24),
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),
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tint = TangemTheme.colors.icon.informative,
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contentDescription = null,
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)
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SpacerH24()
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Text(
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text = "Unsuported networks",
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style = TangemTheme.typography.h3,
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color = TangemTheme.colors.text.primary1,
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textAlign = TextAlign.Center,
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)
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SpacerH8()
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Text(
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text = "Tangem does not currently support a required network by React App.",
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style = TangemTheme.typography.body2,
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color = TangemTheme.colors.text.secondary,
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textAlign = TextAlign.Center,
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)
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SpacerH(48.dp)
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Text(
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text = "Long text to show scrollable content and bottom fade." +
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"\nLorem ipsum dolor sit amet, consectetur adipiscing elit. In imperdiet metus non leo " +
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"ultricies pulvinar. Pellentesque sed condimentum odio. Sed venenatis ac felis non " +
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"consequat. Nunc erat dolor, maximus nec mattis a, tempus at eros. Duis sit amet neque " +
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"dui. Donec consectetur nisl id dui convallis, in posuere dolor eleifend. Pellentesque " +
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"habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. " +
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"Pellentesque consequat scelerisque justo quis tristique. Mauris laoreet venenatis " +
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"pharetra. Morbi sed faucibus leo. Praesent elementum pretium posuere. Morbi et felis a " +
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"turpis pellentesque rhoncus.",
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style = TangemTheme.typography.body1,
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color = TangemTheme.colors.text.secondary,
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textAlign = TextAlign.Center,
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)
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}
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},
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footer = {
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PrimaryButton(
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modifier = Modifier
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.fillMaxWidth()
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.padding(16.dp),
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text = "Go it",
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onClick = {},
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)
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},
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)
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}
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}
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