forked from GitHub-Mirror/riotX-android
50 lines
2.0 KiB
Kotlin
50 lines
2.0 KiB
Kotlin
/*
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* Copyright 2019 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package im.vector.riotx.features.home.room.detail
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import androidx.recyclerview.widget.LinearLayoutManager
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import im.vector.riotx.core.platform.DefaultListUpdateCallback
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import im.vector.riotx.features.home.room.detail.timeline.TimelineEventController
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import java.util.concurrent.atomic.AtomicReference
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class ScrollOnHighlightedEventCallback(private val layoutManager: LinearLayoutManager,
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private val timelineEventController: TimelineEventController) : DefaultListUpdateCallback {
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private val scheduledEventId = AtomicReference<String?>()
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override fun onChanged(position: Int, count: Int, tag: Any?) {
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val eventId = scheduledEventId.get() ?: return
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val positionToScroll = timelineEventController.searchPositionOfEvent(eventId)
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if (positionToScroll != null) {
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val firstVisibleItem = layoutManager.findFirstCompletelyVisibleItemPosition()
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val lastVisibleItem = layoutManager.findLastCompletelyVisibleItemPosition()
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// Do not scroll it item is already visible
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if (positionToScroll !in firstVisibleItem..lastVisibleItem) {
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// Note: Offset will be from the bottom, since the layoutManager is reversed
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layoutManager.scrollToPosition(position)
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}
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scheduledEventId.set(null)
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}
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}
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fun scheduleScrollTo(eventId: String?) {
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scheduledEventId.set(eventId)
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}
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} |