07e9ca8ef6
Flatten the navigation graph into a single "main" graph that links home to both explore and preference fragments. ***This massively breaks the app in it's current state***. Further changes and refactors are needed to get this back to working.
495 lines
22 KiB
Kotlin
495 lines
22 KiB
Kotlin
/*
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* Copyright (c) 2021 Auxio Project
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* MainFragment.kt is part of Auxio.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.oxycblt.auxio
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.ViewTreeObserver
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import android.view.WindowInsets
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import androidx.activity.OnBackPressedCallback
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import androidx.core.view.ViewCompat
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import androidx.core.view.isInvisible
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import androidx.core.view.updatePadding
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import androidx.fragment.app.FragmentContainerView
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import androidx.fragment.app.activityViewModels
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import androidx.navigation.NavController
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import androidx.navigation.NavDestination
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import androidx.navigation.findNavController
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import com.google.android.material.R as MR
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import com.google.android.material.bottomsheet.BackportBottomSheetBehavior
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import com.google.android.material.shape.MaterialShapeDrawable
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import com.google.android.material.transition.MaterialFadeThrough
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import dagger.hilt.android.AndroidEntryPoint
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import kotlin.math.max
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import kotlin.math.min
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import org.oxycblt.auxio.databinding.FragmentMainBinding
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import org.oxycblt.auxio.detail.DetailViewModel
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import org.oxycblt.auxio.list.selection.SelectionViewModel
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import org.oxycblt.auxio.music.Music
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import org.oxycblt.auxio.music.Song
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import org.oxycblt.auxio.playback.Panel
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import org.oxycblt.auxio.playback.PlaybackBottomSheetBehavior
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import org.oxycblt.auxio.playback.PlaybackViewModel
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import org.oxycblt.auxio.playback.queue.QueueBottomSheetBehavior
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import org.oxycblt.auxio.ui.ViewBindingFragment
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import org.oxycblt.auxio.util.collectImmediately
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import org.oxycblt.auxio.util.context
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import org.oxycblt.auxio.util.coordinatorLayoutBehavior
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import org.oxycblt.auxio.util.getAttrColorCompat
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import org.oxycblt.auxio.util.getDimen
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import org.oxycblt.auxio.util.logD
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import org.oxycblt.auxio.util.systemBarInsetsCompat
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import org.oxycblt.auxio.util.unlikelyToBeNull
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/**
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* A wrapper around the home fragment that shows the playback fragment and controls the more
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* high-level navigation features.
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*
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* @author Alexander Capehart (OxygenCobalt)
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*
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* TODO: Break up the god navigation setup going on here
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*/
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@AndroidEntryPoint
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class MainFragment :
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ViewBindingFragment<FragmentMainBinding>(),
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ViewTreeObserver.OnPreDrawListener,
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NavController.OnDestinationChangedListener {
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private val playbackModel: PlaybackViewModel by activityViewModels()
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private val selectionModel: SelectionViewModel by activityViewModels()
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private val detailModel: DetailViewModel by activityViewModels()
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private var sheetBackCallback: SheetBackPressedCallback? = null
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private var detailBackCallback: DetailBackPressedCallback? = null
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private var selectionBackCallback: SelectionBackPressedCallback? = null
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private var exploreBackCallback: ExploreBackPressedCallback? = null
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private var lastInsets: WindowInsets? = null
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private var elevationNormal = 0f
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private var initialNavDestinationChange = true
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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enterTransition = MaterialFadeThrough()
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exitTransition = MaterialFadeThrough()
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}
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override fun onCreateBinding(inflater: LayoutInflater) = FragmentMainBinding.inflate(inflater)
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override fun onBindingCreated(binding: FragmentMainBinding, savedInstanceState: Bundle?) {
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super.onBindingCreated(binding, savedInstanceState)
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val playbackSheetBehavior =
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binding.playbackSheet.coordinatorLayoutBehavior as PlaybackBottomSheetBehavior
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val queueSheetBehavior =
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binding.queueSheet.coordinatorLayoutBehavior as QueueBottomSheetBehavior?
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elevationNormal = binding.context.getDimen(R.dimen.elevation_normal)
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// Currently all back press callbacks are handled in MainFragment, as it's not guaranteed
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// that instantiating these callbacks in their respective fragments would result in the
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// correct order.
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val sheetBackCallback =
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SheetBackPressedCallback(
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playbackSheetBehavior = playbackSheetBehavior,
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queueSheetBehavior = queueSheetBehavior)
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.also { sheetBackCallback = it }
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val detailBackCallback =
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DetailBackPressedCallback(detailModel).also { detailBackCallback = it }
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val selectionBackCallback =
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SelectionBackPressedCallback(selectionModel).also { selectionBackCallback = it }
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val exploreBackCallback =
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ExploreBackPressedCallback(binding.exploreNavHost).also { exploreBackCallback = it }
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// --- UI SETUP ---
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val context = requireActivity()
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// Override the back pressed listener so we can map back navigation to collapsing
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// navigation, navigation out of detail views, etc.
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context.onBackPressedDispatcher.apply {
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addCallback(viewLifecycleOwner, exploreBackCallback)
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addCallback(viewLifecycleOwner, selectionBackCallback)
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addCallback(viewLifecycleOwner, detailBackCallback)
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addCallback(viewLifecycleOwner, sheetBackCallback)
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}
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binding.root.setOnApplyWindowInsetsListener { _, insets ->
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lastInsets = insets
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insets
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}
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// Send meaningful accessibility events for bottom sheets
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ViewCompat.setAccessibilityPaneTitle(
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binding.playbackSheet, context.getString(R.string.lbl_playback))
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ViewCompat.setAccessibilityPaneTitle(
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binding.queueSheet, context.getString(R.string.lbl_queue))
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if (queueSheetBehavior != null) {
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// In portrait mode, set up click listeners on the stacked sheets.
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logD("Configuring stacked bottom sheets")
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unlikelyToBeNull(binding.queueHandleWrapper).setOnClickListener {
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playbackModel.openQueue()
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}
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} else {
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// Dual-pane mode, manually style the static queue sheet.
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logD("Configuring dual-pane bottom sheet")
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binding.queueSheet.apply {
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// Emulate the elevated bottom sheet style.
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background =
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MaterialShapeDrawable.createWithElevationOverlay(context).apply {
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fillColor = context.getAttrColorCompat(MR.attr.colorSurface)
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elevation = context.getDimen(R.dimen.elevation_normal)
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}
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// Apply bar insets for the queue's RecyclerView to use.
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setOnApplyWindowInsetsListener { v, insets ->
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v.updatePadding(top = insets.systemBarInsetsCompat.top)
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insets
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}
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}
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}
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// --- VIEWMODEL SETUP ---
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collectImmediately(detailModel.editedPlaylist, detailBackCallback::invalidateEnabled)
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collectImmediately(selectionModel.selected, selectionBackCallback::invalidateEnabled)
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collectImmediately(playbackModel.song, ::updateSong)
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collectImmediately(playbackModel.openPanel.flow, ::handlePanel)
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}
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override fun onStart() {
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super.onStart()
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val binding = requireBinding()
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// Once we add the destination change callback, we will receive another initialization call,
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// so handle that by resetting the flag.
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initialNavDestinationChange = false
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binding.exploreNavHost.findNavController().addOnDestinationChangedListener(this)
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// Listener could still reasonably fire even if we clear the binding, attach/detach
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// our pre-draw listener our listener in onStart/onStop respectively.
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binding.playbackSheet.viewTreeObserver.addOnPreDrawListener(this@MainFragment)
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}
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override fun onStop() {
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super.onStop()
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val binding = requireBinding()
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binding.exploreNavHost.findNavController().removeOnDestinationChangedListener(this)
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binding.playbackSheet.viewTreeObserver.removeOnPreDrawListener(this)
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}
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override fun onDestroyBinding(binding: FragmentMainBinding) {
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super.onDestroyBinding(binding)
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sheetBackCallback = null
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detailBackCallback = null
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selectionBackCallback = null
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exploreBackCallback = null
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}
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override fun onPreDraw(): Boolean {
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// We overload CoordinatorLayout far too much to rely on any of it's typical
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// listener functionality. Just update all transitions before every draw. Should
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// probably be cheap enough.
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val binding = requireBinding()
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val playbackSheetBehavior =
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binding.playbackSheet.coordinatorLayoutBehavior as PlaybackBottomSheetBehavior
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val queueSheetBehavior =
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binding.queueSheet.coordinatorLayoutBehavior as QueueBottomSheetBehavior?
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val playbackRatio = max(playbackSheetBehavior.calculateSlideOffset(), 0f)
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val outPlaybackRatio = 1 - playbackRatio
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val halfOutRatio = min(playbackRatio * 2, 1f)
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val halfInPlaybackRatio = max(playbackRatio - 0.5f, 0f) * 2
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if (queueSheetBehavior != null) {
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// Queue sheet available, the normal transition applies, but it now much be combined
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// with another transition where the playback panel disappears and the playback bar
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// appears as the queue sheet expands.
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val queueRatio = max(queueSheetBehavior.calculateSlideOffset(), 0f)
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val halfOutQueueRatio = min(queueRatio * 2, 1f)
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val halfInQueueRatio = max(queueRatio - 0.5f, 0f) * 2
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binding.playbackBarFragment.alpha = max(1 - halfOutRatio, halfInQueueRatio)
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binding.playbackPanelFragment.alpha = min(halfInPlaybackRatio, 1 - halfOutQueueRatio)
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binding.queueFragment.alpha = queueRatio
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if (playbackModel.song.value != null) {
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// Playback sheet intercepts queue sheet touch events, prevent that from
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// occurring by disabling dragging whenever the queue sheet is expanded.
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playbackSheetBehavior.isDraggable =
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queueSheetBehavior.state == BackportBottomSheetBehavior.STATE_COLLAPSED
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}
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} else {
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// No queue sheet, fade normally based on the playback sheet
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binding.playbackBarFragment.alpha = 1 - halfOutRatio
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binding.playbackPanelFragment.alpha = halfInPlaybackRatio
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}
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// Fade out the content as the playback panel expands.
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// TODO: Replace with shadow?
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binding.exploreNavHost.apply {
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alpha = outPlaybackRatio
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// Prevent interactions when the content fully fades out.
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isInvisible = alpha == 0f
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}
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// Reduce playback sheet elevation as it expands. This involves both updating the
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// shadow elevation for older versions, and fading out the background drawable
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// containing the elevation overlay.
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binding.playbackSheet.translationZ = elevationNormal * outPlaybackRatio
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playbackSheetBehavior.sheetBackgroundDrawable.alpha = (outPlaybackRatio * 255).toInt()
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// Fade out the playback bar as the panel expands.
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binding.playbackBarFragment.apply {
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// Prevent interactions when the playback bar fully fades out.
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isInvisible = alpha == 0f
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// As the playback bar expands, we also want to subtly translate the bar to
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// align with the top inset. This results in both a smooth transition from the bar
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// to the playback panel's toolbar, but also a correctly positioned playback bar
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// for when the queue sheet expands.
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lastInsets?.let { translationY = it.systemBarInsetsCompat.top * halfOutRatio }
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}
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// Prevent interactions when the playback panel fully fades out.
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binding.playbackPanelFragment.isInvisible = binding.playbackPanelFragment.alpha == 0f
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binding.queueSheet.apply {
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// Queue sheet (not queue content) should fade out with the playback panel.
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alpha = halfInPlaybackRatio
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// Prevent interactions when the queue sheet fully fades out.
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binding.queueSheet.isInvisible = alpha == 0f
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}
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// Prevent interactions when the queue content fully fades out.
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binding.queueFragment.isInvisible = binding.queueFragment.alpha == 0f
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if (playbackModel.song.value == null) {
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// Sometimes lingering drags can un-hide the playback sheet even when we intend to
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// hide it, make sure we keep it hidden.
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tryHideAllSheets()
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}
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// Since the navigation listener is also reliant on the bottom sheets, we must also update
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// it every frame.
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requireNotNull(sheetBackCallback) { "SheetBackPressedCallback was not available" }
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.invalidateEnabled()
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return true
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}
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override fun onDestinationChanged(
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controller: NavController,
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destination: NavDestination,
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arguments: Bundle?
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) {
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// Drop the initial call by NavController that simply provides us with the current
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// destination. This would cause the selection state to be lost every time the device
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// rotates.
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requireNotNull(exploreBackCallback) { "ExploreBackPressedCallback was not available" }
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.invalidateEnabled()
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if (!initialNavDestinationChange) {
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initialNavDestinationChange = true
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return
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}
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selectionModel.drop()
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}
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private fun updateSong(song: Song?) {
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if (song != null) {
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tryShowSheets()
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} else {
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tryHideAllSheets()
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}
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}
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private fun handlePanel(panel: Panel?) {
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if (panel == null) return
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logD("Trying to update panel to $panel")
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when (panel) {
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is Panel.Main -> tryClosePlaybackPanel()
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is Panel.Playback -> tryOpenPlaybackPanel()
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is Panel.Queue -> tryOpenQueuePanel()
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}
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playbackModel.openPanel.consume()
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}
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private fun tryOpenPlaybackPanel() {
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val binding = requireBinding()
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val playbackSheetBehavior =
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binding.playbackSheet.coordinatorLayoutBehavior as PlaybackBottomSheetBehavior
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if (playbackSheetBehavior.targetState == BackportBottomSheetBehavior.STATE_COLLAPSED) {
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// Playback sheet is not expanded and not hidden, we can expand it.
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logD("Expanding playback sheet")
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playbackSheetBehavior.state = BackportBottomSheetBehavior.STATE_EXPANDED
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return
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}
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val queueSheetBehavior =
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(binding.queueSheet.coordinatorLayoutBehavior ?: return) as QueueBottomSheetBehavior
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if (playbackSheetBehavior.state == BackportBottomSheetBehavior.STATE_EXPANDED &&
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queueSheetBehavior.targetState == BackportBottomSheetBehavior.STATE_EXPANDED) {
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// Queue sheet and playback sheet is expanded, close the queue sheet so the
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// playback panel can shown.
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logD("Collapsing queue sheet")
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queueSheetBehavior.state = BackportBottomSheetBehavior.STATE_COLLAPSED
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}
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}
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private fun tryClosePlaybackPanel() {
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val binding = requireBinding()
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val playbackSheetBehavior =
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binding.playbackSheet.coordinatorLayoutBehavior as PlaybackBottomSheetBehavior
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if (playbackSheetBehavior.targetState == BackportBottomSheetBehavior.STATE_EXPANDED) {
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// Playback sheet (and possibly queue) needs to be collapsed.
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logD("Collapsing playback and queue sheets")
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val queueSheetBehavior =
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binding.queueSheet.coordinatorLayoutBehavior as QueueBottomSheetBehavior?
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playbackSheetBehavior.state = BackportBottomSheetBehavior.STATE_COLLAPSED
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queueSheetBehavior?.state = BackportBottomSheetBehavior.STATE_COLLAPSED
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}
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}
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private fun tryOpenQueuePanel() {
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val binding = requireBinding()
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val playbackSheetBehavior =
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binding.playbackSheet.coordinatorLayoutBehavior as PlaybackBottomSheetBehavior
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val queueSheetBehavior =
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(binding.queueSheet.coordinatorLayoutBehavior ?: return) as QueueBottomSheetBehavior
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if (playbackSheetBehavior.state == BackportBottomSheetBehavior.STATE_EXPANDED &&
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queueSheetBehavior.targetState == BackportBottomSheetBehavior.STATE_COLLAPSED) {
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// Playback sheet is expanded and queue sheet is collapsed, we can expand it.
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queueSheetBehavior.state = BackportBottomSheetBehavior.STATE_EXPANDED
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}
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}
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private fun tryShowSheets() {
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val binding = requireBinding()
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val playbackSheetBehavior =
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binding.playbackSheet.coordinatorLayoutBehavior as PlaybackBottomSheetBehavior
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if (playbackSheetBehavior.targetState == BackportBottomSheetBehavior.STATE_HIDDEN) {
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logD("Unhiding and enabling playback sheet")
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val queueSheetBehavior =
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binding.queueSheet.coordinatorLayoutBehavior as QueueBottomSheetBehavior?
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// Queue sheet behavior is either collapsed or expanded, no hiding needed
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queueSheetBehavior?.isDraggable = true
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playbackSheetBehavior.apply {
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// Make sure the view is draggable, at least until the draw checks kick in.
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isDraggable = true
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state = BackportBottomSheetBehavior.STATE_COLLAPSED
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}
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}
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}
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private fun tryHideAllSheets() {
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val binding = requireBinding()
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val playbackSheetBehavior =
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binding.playbackSheet.coordinatorLayoutBehavior as PlaybackBottomSheetBehavior
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if (playbackSheetBehavior.targetState != BackportBottomSheetBehavior.STATE_HIDDEN) {
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val queueSheetBehavior =
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binding.queueSheet.coordinatorLayoutBehavior as QueueBottomSheetBehavior?
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logD("Hiding and disabling playback and queue sheets")
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// Make both bottom sheets non-draggable so the user can't halt the hiding event.
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queueSheetBehavior?.apply {
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isDraggable = false
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state = BackportBottomSheetBehavior.STATE_COLLAPSED
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}
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playbackSheetBehavior.apply {
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isDraggable = false
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state = BackportBottomSheetBehavior.STATE_HIDDEN
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}
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}
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}
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private class SheetBackPressedCallback(
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private val playbackSheetBehavior: PlaybackBottomSheetBehavior<*>,
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private val queueSheetBehavior: QueueBottomSheetBehavior<*>?
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) : OnBackPressedCallback(false) {
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override fun handleOnBackPressed() {
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// If expanded, collapse the queue sheet first.
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if (queueSheetShown()) {
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unlikelyToBeNull(queueSheetBehavior).state =
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BackportBottomSheetBehavior.STATE_COLLAPSED
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logD("Collapsed queue sheet")
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return
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}
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// If expanded, collapse the playback sheet next.
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if (playbackSheetShown()) {
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playbackSheetBehavior.state = BackportBottomSheetBehavior.STATE_COLLAPSED
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logD("Collapsed playback sheet")
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return
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}
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}
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fun invalidateEnabled() {
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isEnabled = queueSheetShown() || playbackSheetShown()
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}
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private fun playbackSheetShown() =
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playbackSheetBehavior.targetState != BackportBottomSheetBehavior.STATE_COLLAPSED &&
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playbackSheetBehavior.targetState != BackportBottomSheetBehavior.STATE_HIDDEN
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private fun queueSheetShown() =
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queueSheetBehavior != null &&
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playbackSheetBehavior.state == BackportBottomSheetBehavior.STATE_EXPANDED &&
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queueSheetBehavior.targetState != BackportBottomSheetBehavior.STATE_COLLAPSED
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}
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private class DetailBackPressedCallback(private val detailModel: DetailViewModel) :
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OnBackPressedCallback(false) {
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override fun handleOnBackPressed() {
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if (detailModel.dropPlaylistEdit()) {
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logD("Dropped playlist edits")
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}
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}
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fun invalidateEnabled(playlistEdit: List<Song>?) {
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isEnabled = playlistEdit != null
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}
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}
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private inner class SelectionBackPressedCallback(
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private val selectionModel: SelectionViewModel
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) : OnBackPressedCallback(false) {
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override fun handleOnBackPressed() {
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if (selectionModel.drop()) {
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logD("Dropped selection")
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}
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}
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fun invalidateEnabled(selection: List<Music>) {
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isEnabled = selection.isNotEmpty()
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}
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}
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private inner class ExploreBackPressedCallback(
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private val exploreNavHost: FragmentContainerView
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) : OnBackPressedCallback(false) {
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// Note: We cannot cache the NavController in a variable since it's current destination
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// value goes stale for some reason.
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override fun handleOnBackPressed() {
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exploreNavHost.findNavController().navigateUp()
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|
logD("Forwarded back navigation to explore nav host")
|
|
}
|
|
|
|
fun invalidateEnabled() {
|
|
val exploreNavController = exploreNavHost.findNavController()
|
|
isEnabled =
|
|
exploreNavController.currentDestination?.id !=
|
|
exploreNavController.graph.startDestinationId
|
|
}
|
|
}
|
|
}
|