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feat: Add bottom-nav scroll-to-top handling for nodes and conversations (#3674)

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Mac DeCourcy 2025-11-12 14:22:21 -08:00 • committed by GitHub
parent 00276bc5d4
commit bc8ff26167
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8 changed files with 176 additions and 13 deletions
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28
core/ui/src/main/kotlin/org/meshtastic/core/ui/component/ScrollToTopEvent.kt Normal file
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/*
* Copyright (c) 2025 Meshtastic LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.meshtastic.core.ui.component
/**
* Event emitted when a user re-presses a bottom navigation destination that should trigger a scroll-to-top behaviour on
* the corresponding screen.
*/
sealed class ScrollToTopEvent {
data object NodesTabPressed : ScrollToTopEvent()
data object ConversationsTabPressed : ScrollToTopEvent()
}

46
core/ui/src/main/kotlin/org/meshtastic/core/ui/component/ScrollToTopExtensions.kt Normal file
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/*
* Copyright (c) 2025 Meshtastic LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.meshtastic.core.ui.component
import androidx.compose.foundation.lazy.LazyListState
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.launch
import kotlin.math.max
private const val SCROLL_TO_TOP_INDEX = 0
private const val FAST_SCROLL_THRESHOLD = 10
/**
* Executes the smart scroll-to-top policy.
*
* Policy:
* - If the first visible item is already at index 0, do nothing.
* - Otherwise, smoothly animate the list back to the first item.
*/
fun LazyListState.smartScrollToTop(coroutineScope: CoroutineScope) {
if (firstVisibleItemIndex == SCROLL_TO_TOP_INDEX) {
return
}
coroutineScope.launch {
if (firstVisibleItemIndex > FAST_SCROLL_THRESHOLD) {
val jumpIndex = max(SCROLL_TO_TOP_INDEX, firstVisibleItemIndex - FAST_SCROLL_THRESHOLD)
scrollToItem(jumpIndex)
}
animateScrollToItem(index = SCROLL_TO_TOP_INDEX)
}
}