Add custom layout manager
This commit is contained in:
Lucas Lima
parent
ce236a5bfa
commit
800ee419e8
4 changed files with 959 additions and 76 deletions
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@ -6,10 +6,8 @@ import android.view.View
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import android.view.ViewGroup
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import androidx.lifecycle.Observer
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import androidx.lifecycle.ViewModelProviders
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import androidx.recyclerview.widget.GridLayoutManager
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import androidx.recyclerview.widget.RecyclerView
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import dev.lucasnlm.antimine.common.R
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import dev.lucasnlm.antimine.common.level.view.UnlockedHorizontalScrollView
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import dagger.android.support.DaggerFragment
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import dev.lucasnlm.antimine.common.level.models.Difficulty
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import dev.lucasnlm.antimine.common.level.models.Event
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@ -17,6 +15,7 @@ import dev.lucasnlm.antimine.common.level.view.AreaAdapter
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import dev.lucasnlm.antimine.common.level.view.SpaceItemDecoration
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import dev.lucasnlm.antimine.common.level.viewmodel.GameViewModel
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import dev.lucasnlm.antimine.common.level.viewmodel.GameViewModelFactory
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import dev.lucasnlm.antimine.level.widget.FixedGridLayoutManager
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.GlobalScope
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import kotlinx.coroutines.launch
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@ -29,7 +28,6 @@ open class LevelFragment : DaggerFragment() {
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private lateinit var viewModel: GameViewModel
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private lateinit var recyclerGrid: RecyclerView
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private lateinit var bidirectionalScroll: UnlockedHorizontalScrollView
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private lateinit var areaAdapter: AreaAdapter
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override fun onCreateView(
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@ -60,30 +58,22 @@ open class LevelFragment : DaggerFragment() {
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super.onViewCreated(view, savedInstanceState)
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recyclerGrid = view.findViewById(R.id.recyclerGrid)
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recyclerGrid.apply {
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setHasFixedSize(true)
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isNestedScrollingEnabled = false
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addItemDecoration(SpaceItemDecoration(R.dimen.field_padding))
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adapter = areaAdapter
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alpha = 0.0f
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}
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bidirectionalScroll = view.findViewById(R.id.bidirectionalScroll)
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bidirectionalScroll.setTarget(recyclerGrid)
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GlobalScope.launch {
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val levelSetup = viewModel.onCreate(handleNewGameDeeplink())
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val width = levelSetup.width
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withContext(Dispatchers.Main) {
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recyclerGrid.layoutManager =
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GridLayoutManager(activity, width, RecyclerView.VERTICAL, false)
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recyclerGrid.apply {
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setHasFixedSize(true)
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isNestedScrollingEnabled = false
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addItemDecoration(SpaceItemDecoration(R.dimen.field_padding))
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layoutManager = FixedGridLayoutManager().apply {
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setTotalColumnCount(levelSetup.width)
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}
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adapter = areaAdapter
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alpha = 0.0f
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view.post {
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recyclerGrid.scrollBy(0, recyclerGrid.height / 2)
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bidirectionalScroll.scrollBy(recyclerGrid.width / 4, 0)
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recyclerGrid.animate().apply {
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animate().apply {
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alpha(1.0f)
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duration = 1000
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}.start()
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@ -97,8 +87,9 @@ open class LevelFragment : DaggerFragment() {
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})
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levelSetup.observe(viewLifecycleOwner, Observer {
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recyclerGrid.layoutManager =
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GridLayoutManager(activity, it.width, RecyclerView.VERTICAL, false)
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recyclerGrid.layoutManager = FixedGridLayoutManager().apply {
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setTotalColumnCount(it.width)
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}
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})
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fieldRefresh.observe(viewLifecycleOwner, Observer {
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@ -114,7 +105,7 @@ open class LevelFragment : DaggerFragment() {
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Event.Running,
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Event.ResumeGame,
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Event.StartNewGame -> areaAdapter.setClickEnabled(true)
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else -> {}
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else -> { }
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}
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})
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}
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@ -0,0 +1,918 @@
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package dev.lucasnlm.antimine.level.widget;
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import android.content.Context;
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import android.graphics.PointF;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.util.SparseArray;
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import android.util.SparseIntArray;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.recyclerview.widget.LinearSmoothScroller;
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import androidx.recyclerview.widget.RecyclerView;
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import java.util.HashSet;
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import java.util.List;
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public class FixedGridLayoutManager extends RecyclerView.LayoutManager {
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private static final String TAG = FixedGridLayoutManager.class.getSimpleName();
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private static final int DEFAULT_COUNT = 1;
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/* View Removal Constants */
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private static final int REMOVE_VISIBLE = 0;
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private static final int REMOVE_INVISIBLE = 1;
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/* Fill Direction Constants */
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private static final int DIRECTION_NONE = -1;
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private static final int DIRECTION_START = 0;
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private static final int DIRECTION_END = 1;
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private static final int DIRECTION_UP = 2;
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private static final int DIRECTION_DOWN = 3;
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/* First (top-left) position visible at any point */
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private int mFirstVisiblePosition;
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/* Consistent size applied to all child views */
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private int mDecoratedChildWidth;
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private int mDecoratedChildHeight;
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/* Number of columns that exist in the grid */
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private int mTotalColumnCount = DEFAULT_COUNT;
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/* Metrics for the visible window of our data */
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private int mVisibleColumnCount;
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private int mVisibleRowCount;
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/* Used for tracking off-screen change events */
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private int mFirstChangedPosition;
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private int mChangedPositionCount;
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/**
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* Set the number of columns the layout manager will use. This will
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* trigger a layout update.
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* @param count Number of columns.
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*/
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public void setTotalColumnCount(int count) {
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mTotalColumnCount = count;
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requestLayout();
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}
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/*
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* You must return true from this method if you want your
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* LayoutManager to support anything beyond "simple" item
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* animations. Enabling this causes onLayoutChildren() to
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* be called twice on each animated change; once for a
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* pre-layout, and again for the real layout.
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*/
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@Override
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public boolean supportsPredictiveItemAnimations() {
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return true;
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}
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/*
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* Called by RecyclerView when a view removal is triggered. This is called
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* before onLayoutChildren() in pre-layout if the views removed are not visible. We
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* use it in this case to inform pre-layout that a removal took place.
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*
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* This method is still called if the views removed were visible, but it will
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* happen AFTER pre-layout.
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*/
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@Override
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public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) {
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mFirstChangedPosition = positionStart;
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mChangedPositionCount = itemCount;
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}
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/*
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* This method is your initial call from the framework. You will receive it when you
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* need to start laying out the initial set of views. This method will not be called
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* repeatedly, so don't rely on it to continually process changes during user
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* interaction.
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*
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* This method will be called when the data set in the adapter changes, so it can be
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* used to update a layout based on a new item count.
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*
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* If predictive animations are enabled, you will see this called twice. First, with
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* state.isPreLayout() returning true to lay out children in their initial conditions.
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* Then again to lay out children in their final locations.
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*/
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@Override
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public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
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//We have nothing to show for an empty data set but clear any existing views
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if (getItemCount() == 0) {
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detachAndScrapAttachedViews(recycler);
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return;
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}
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if (getChildCount() == 0 && state.isPreLayout()) {
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//Nothing to do during prelayout when empty
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return;
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}
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//Clear change tracking state when a real layout occurs
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if (!state.isPreLayout()) {
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mFirstChangedPosition = mChangedPositionCount = 0;
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}
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if (getChildCount() == 0) { //First or empty layout
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//Scrap measure one child
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View scrap = recycler.getViewForPosition(0);
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addView(scrap);
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measureChildWithMargins(scrap, 0, 0);
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/*
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* We make some assumptions in this code based on every child
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* view being the same size (i.e. a uniform grid). This allows
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* us to compute the following values up front because they
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* won't change.
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*/
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mDecoratedChildWidth = getDecoratedMeasuredWidth(scrap);
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mDecoratedChildHeight = getDecoratedMeasuredHeight(scrap);
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detachAndScrapView(scrap, recycler);
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}
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//Always update the visible row/column counts
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updateWindowSizing();
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SparseIntArray removedCache = null;
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/*
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* During pre-layout, we need to take note of any views that are
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* being removed in order to handle predictive animations
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*/
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if (state.isPreLayout()) {
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removedCache = new SparseIntArray(getChildCount());
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for (int i=0; i < getChildCount(); i++) {
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final View view = getChildAt(i);
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LayoutParams lp = (LayoutParams) view.getLayoutParams();
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if (lp.isItemRemoved()) {
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//Track these view removals as visible
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removedCache.put(lp.getViewLayoutPosition(), REMOVE_VISIBLE);
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}
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}
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//Track view removals that happened out of bounds (i.e. off-screen)
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if (removedCache.size() == 0 && mChangedPositionCount > 0) {
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for (int i = mFirstChangedPosition; i < (mFirstChangedPosition + mChangedPositionCount); i++) {
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removedCache.put(i, REMOVE_INVISIBLE);
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}
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}
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}
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int childLeft;
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int childTop;
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if (getChildCount() == 0) { //First or empty layout
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//Reset the visible and scroll positions
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mFirstVisiblePosition = 0;
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childLeft = getPaddingLeft();
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childTop = getPaddingTop();
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} else if (!state.isPreLayout()
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&& getVisibleChildCount() >= state.getItemCount()) {
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//Data set is too small to scroll fully, just reset position
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mFirstVisiblePosition = 0;
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childLeft = getPaddingLeft();
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childTop = getPaddingTop();
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} else { //Adapter data set changes
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/*
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* Keep the existing initial position, and save off
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* the current scrolled offset.
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*/
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final View topChild = getChildAt(0);
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childLeft = getDecoratedLeft(topChild);
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childTop = getDecoratedTop(topChild);
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/*
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* When data set is too small to scroll vertically, adjust vertical offset
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* and shift position to the first row, preserving current column
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*/
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if (!state.isPreLayout() && getVerticalSpace() > (getTotalRowCount() * mDecoratedChildHeight)) {
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mFirstVisiblePosition = mFirstVisiblePosition % getTotalColumnCount();
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childTop = getPaddingTop();
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//If the shift overscrolls the column max, back it off
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if ((mFirstVisiblePosition + mVisibleColumnCount) > state.getItemCount()) {
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mFirstVisiblePosition = Math.max(state.getItemCount() - mVisibleColumnCount, 0);
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childLeft = getPaddingLeft();
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}
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}
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/*
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* Adjust the visible position if out of bounds in the
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* new layout. This occurs when the new item count in an adapter
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* is much smaller than it was before, and you are scrolled to
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* a location where no items would exist.
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*/
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int maxFirstRow = getTotalRowCount() - (mVisibleRowCount-1);
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int maxFirstCol = getTotalColumnCount() - (mVisibleColumnCount-1);
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boolean isOutOfRowBounds = getFirstVisibleRow() > maxFirstRow;
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boolean isOutOfColBounds = getFirstVisibleColumn() > maxFirstCol;
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if (isOutOfRowBounds || isOutOfColBounds) {
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int firstRow;
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if (isOutOfRowBounds) {
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firstRow = maxFirstRow;
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} else {
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firstRow = getFirstVisibleRow();
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}
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int firstCol;
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if (isOutOfColBounds) {
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firstCol = maxFirstCol;
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} else {
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firstCol = getFirstVisibleColumn();
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}
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mFirstVisiblePosition = firstRow * getTotalColumnCount() + firstCol;
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childLeft = getHorizontalSpace() - (mDecoratedChildWidth * mVisibleColumnCount);
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childTop = getVerticalSpace() - (mDecoratedChildHeight * mVisibleRowCount);
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//Correct cases where shifting to the bottom-right overscrolls the top-left
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// This happens on data sets too small to scroll in a direction.
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if (getFirstVisibleRow() == 0) {
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childTop = Math.min(childTop, getPaddingTop());
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}
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if (getFirstVisibleColumn() == 0) {
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childLeft = Math.min(childLeft, getPaddingLeft());
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}
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}
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}
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//Clear all attached views into the recycle bin
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detachAndScrapAttachedViews(recycler);
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//Fill the grid for the initial layout of views
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fillGrid(DIRECTION_NONE, childLeft, childTop, recycler, state, removedCache);
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//Evaluate any disappearing views that may exist
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if (!state.isPreLayout() && !recycler.getScrapList().isEmpty()) {
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final List<RecyclerView.ViewHolder> scrapList = recycler.getScrapList();
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final HashSet<View> disappearingViews = new HashSet<View>(scrapList.size());
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for (RecyclerView.ViewHolder holder : scrapList) {
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final View child = holder.itemView;
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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if (!lp.isItemRemoved()) {
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disappearingViews.add(child);
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}
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}
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for (View child : disappearingViews) {
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layoutDisappearingView(child);
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}
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}
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}
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@Override
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public void onAdapterChanged(RecyclerView.Adapter oldAdapter, RecyclerView.Adapter newAdapter) {
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//Completely scrap the existing layout
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removeAllViews();
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}
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/*
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* Rather than continuously checking how many views we can fit
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* based on scroll offsets, we simplify the math by computing the
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* visible grid as what will initially fit on screen, plus one.
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*/
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private void updateWindowSizing() {
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mVisibleColumnCount = (getHorizontalSpace() / mDecoratedChildWidth) + 1;
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if (getHorizontalSpace() % mDecoratedChildWidth > 0) {
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mVisibleColumnCount++;
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}
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//Allow minimum value for small data sets
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if (mVisibleColumnCount > getTotalColumnCount()) {
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mVisibleColumnCount = getTotalColumnCount();
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}
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mVisibleRowCount = (getVerticalSpace()/ mDecoratedChildHeight) + 1;
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if (getVerticalSpace() % mDecoratedChildHeight > 0) {
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mVisibleRowCount++;
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}
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if (mVisibleRowCount > getTotalRowCount()) {
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mVisibleRowCount = getTotalRowCount();
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}
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}
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private void fillGrid(int direction, RecyclerView.Recycler recycler, RecyclerView.State state) {
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fillGrid(direction, 0, 0, recycler, state, null);
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}
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private void fillGrid(int direction, int emptyLeft, int emptyTop,
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RecyclerView.Recycler recycler,
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RecyclerView.State state,
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SparseIntArray removedPositions) {
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if (mFirstVisiblePosition < 0) mFirstVisiblePosition = 0;
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if (mFirstVisiblePosition >= getItemCount()) mFirstVisiblePosition = (getItemCount() - 1);
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/*
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* First, we will detach all existing views from the layout.
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* detachView() is a lightweight operation that we can use to
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* quickly reorder views without a full add/remove.
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*/
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SparseArray<View> viewCache = new SparseArray<View>(getChildCount());
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int startLeftOffset = emptyLeft;
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int startTopOffset = emptyTop;
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if (getChildCount() != 0) {
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final View topView = getChildAt(0);
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startLeftOffset = getDecoratedLeft(topView);
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startTopOffset = getDecoratedTop(topView);
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switch (direction) {
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case DIRECTION_START:
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startLeftOffset -= mDecoratedChildWidth;
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break;
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case DIRECTION_END:
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startLeftOffset += mDecoratedChildWidth;
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break;
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case DIRECTION_UP:
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startTopOffset -= mDecoratedChildHeight;
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break;
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case DIRECTION_DOWN:
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startTopOffset += mDecoratedChildHeight;
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break;
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}
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//Cache all views by their existing position, before updating counts
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for (int i=0; i < getChildCount(); i++) {
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int position = positionOfIndex(i);
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final View child = getChildAt(i);
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viewCache.put(position, child);
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}
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//Temporarily detach all views.
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// Views we still need will be added back at the proper index.
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for (int i=0; i < viewCache.size(); i++) {
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detachView(viewCache.valueAt(i));
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}
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}
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/*
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* Next, we advance the visible position based on the fill direction.
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* DIRECTION_NONE doesn't advance the position in any direction.
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*/
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switch (direction) {
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case DIRECTION_START:
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mFirstVisiblePosition--;
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break;
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case DIRECTION_END:
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mFirstVisiblePosition++;
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break;
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case DIRECTION_UP:
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mFirstVisiblePosition -= getTotalColumnCount();
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break;
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case DIRECTION_DOWN:
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mFirstVisiblePosition += getTotalColumnCount();
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break;
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}
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/*
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* Next, we supply the grid of items that are deemed visible.
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* If these items were previously there, they will simply be
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* re-attached. New views that must be created are obtained
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* from the Recycler and added.
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*/
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int leftOffset = startLeftOffset;
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int topOffset = startTopOffset;
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for (int i = 0; i < getVisibleChildCount(); i++) {
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int nextPosition = positionOfIndex(i);
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/*
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* When a removal happens out of bounds, the pre-layout positions of items
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* after the removal are shifted to their final positions ahead of schedule.
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* We have to track off-screen removals and shift those positions back
|
||||
* so we can properly lay out all current (and appearing) views in their
|
||||
* initial locations.
|
||||
*/
|
||||
int offsetPositionDelta = 0;
|
||||
if (state.isPreLayout()) {
|
||||
int offsetPosition = nextPosition;
|
||||
|
||||
for (int offset = 0; offset < removedPositions.size(); offset++) {
|
||||
//Look for off-screen removals that are less-than this
|
||||
if (removedPositions.valueAt(offset) == REMOVE_INVISIBLE
|
||||
&& removedPositions.keyAt(offset) < nextPosition) {
|
||||
//Offset position to match
|
||||
offsetPosition--;
|
||||
}
|
||||
}
|
||||
offsetPositionDelta = nextPosition - offsetPosition;
|
||||
nextPosition = offsetPosition;
|
||||
}
|
||||
|
||||
if (nextPosition < 0 || nextPosition >= state.getItemCount()) {
|
||||
//Item space beyond the data set, don't attempt to add a view
|
||||
continue;
|
||||
}
|
||||
|
||||
//Layout this position
|
||||
View view = viewCache.get(nextPosition);
|
||||
if (view == null) {
|
||||
/*
|
||||
* The Recycler will give us either a newly constructed view,
|
||||
* or a recycled view it has on-hand. In either case, the
|
||||
* view will already be fully bound to the data by the
|
||||
* adapter for us.
|
||||
*/
|
||||
view = recycler.getViewForPosition(nextPosition);
|
||||
addView(view);
|
||||
|
||||
/*
|
||||
* Update the new view's metadata, but only when this is a real
|
||||
* layout pass.
|
||||
*/
|
||||
if (!state.isPreLayout()) {
|
||||
LayoutParams lp = (LayoutParams) view.getLayoutParams();
|
||||
lp.row = getGlobalRowOfPosition(nextPosition);
|
||||
lp.column = getGlobalColumnOfPosition(nextPosition);
|
||||
}
|
||||
|
||||
/*
|
||||
* It is prudent to measure/layout each new view we
|
||||
* receive from the Recycler. We don't have to do
|
||||
* this for views we are just re-arranging.
|
||||
*/
|
||||
measureChildWithMargins(view, 0, 0);
|
||||
layoutDecorated(view, leftOffset, topOffset,
|
||||
leftOffset + mDecoratedChildWidth,
|
||||
topOffset + mDecoratedChildHeight);
|
||||
|
||||
} else {
|
||||
//Re-attach the cached view at its new index
|
||||
attachView(view);
|
||||
viewCache.remove(nextPosition);
|
||||
}
|
||||
|
||||
if (i % mVisibleColumnCount == (mVisibleColumnCount - 1)) {
|
||||
leftOffset = startLeftOffset;
|
||||
topOffset += mDecoratedChildHeight;
|
||||
|
||||
//During pre-layout, on each column end, apply any additional appearing views
|
||||
if (state.isPreLayout()) {
|
||||
layoutAppearingViews(recycler, view, nextPosition, removedPositions.size(), offsetPositionDelta);
|
||||
}
|
||||
} else {
|
||||
leftOffset += mDecoratedChildWidth;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Finally, we ask the Recycler to scrap and store any views
|
||||
* that we did not re-attach. These are views that are not currently
|
||||
* necessary because they are no longer visible.
|
||||
*/
|
||||
for (int i=0; i < viewCache.size(); i++) {
|
||||
final View removingView = viewCache.valueAt(i);
|
||||
recycler.recycleView(removingView);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* You must override this method if you would like to support external calls
|
||||
* to shift the view to a given adapter position. In our implementation, this
|
||||
* is the same as doing a fresh layout with the given position as the top-left
|
||||
* (or first visible), so we simply set that value and trigger onLayoutChildren()
|
||||
*/
|
||||
@Override
|
||||
public void scrollToPosition(int position) {
|
||||
if (position >= getItemCount()) {
|
||||
Log.e(TAG, "Cannot scroll to "+position+", item count is "+getItemCount());
|
||||
return;
|
||||
}
|
||||
|
||||
//Set requested position as first visible
|
||||
mFirstVisiblePosition = position;
|
||||
//Toss all existing views away
|
||||
removeAllViews();
|
||||
//Trigger a new view layout
|
||||
requestLayout();
|
||||
}
|
||||
|
||||
/*
|
||||
* You must override this method if you would like to support external calls
|
||||
* to animate a change to a new adapter position. The framework provides a
|
||||
* helper scroller implementation (LinearSmoothScroller), which we leverage
|
||||
* to do the animation calculations.
|
||||
*/
|
||||
@Override
|
||||
public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, final int position) {
|
||||
if (position >= getItemCount()) {
|
||||
Log.e(TAG, "Cannot scroll to "+position+", item count is "+getItemCount());
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* LinearSmoothScroller's default behavior is to scroll the contents until
|
||||
* the child is fully visible. It will snap to the top-left or bottom-right
|
||||
* of the parent depending on whether the direction of travel was positive
|
||||
* or negative.
|
||||
*/
|
||||
LinearSmoothScroller scroller = new LinearSmoothScroller(recyclerView.getContext()) {
|
||||
/*
|
||||
* LinearSmoothScroller, at a minimum, just need to know the vector
|
||||
* (x/y distance) to travel in order to get from the current positioning
|
||||
* to the target.
|
||||
*/
|
||||
@Override
|
||||
public PointF computeScrollVectorForPosition(int targetPosition) {
|
||||
final int rowOffset = getGlobalRowOfPosition(targetPosition)
|
||||
- getGlobalRowOfPosition(mFirstVisiblePosition);
|
||||
final int columnOffset = getGlobalColumnOfPosition(targetPosition)
|
||||
- getGlobalColumnOfPosition(mFirstVisiblePosition);
|
||||
|
||||
return new PointF(columnOffset * mDecoratedChildWidth, rowOffset * mDecoratedChildHeight);
|
||||
}
|
||||
};
|
||||
scroller.setTargetPosition(position);
|
||||
startSmoothScroll(scroller);
|
||||
}
|
||||
|
||||
/*
|
||||
* Use this method to tell the RecyclerView if scrolling is even possible
|
||||
* in the horizontal direction.
|
||||
*/
|
||||
@Override
|
||||
public boolean canScrollHorizontally() {
|
||||
//We do allow scrolling
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* This method describes how far RecyclerView thinks the contents should scroll horizontally.
|
||||
* You are responsible for verifying edge boundaries, and determining if this scroll
|
||||
* event somehow requires that new views be added or old views get recycled.
|
||||
*/
|
||||
@Override
|
||||
public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) {
|
||||
if (getChildCount() == 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
//Take leftmost measurements from the top-left child
|
||||
final View topView = getChildAt(0);
|
||||
//Take rightmost measurements from the top-right child
|
||||
final View bottomView = getChildAt(mVisibleColumnCount-1);
|
||||
|
||||
//Optimize the case where the entire data set is too small to scroll
|
||||
int viewSpan = getDecoratedRight(bottomView) - getDecoratedLeft(topView);
|
||||
if (viewSpan < getHorizontalSpace()) {
|
||||
//We cannot scroll in either direction
|
||||
return 0;
|
||||
}
|
||||
|
||||
int delta;
|
||||
boolean leftBoundReached = getFirstVisibleColumn() == 0;
|
||||
boolean rightBoundReached = getLastVisibleColumn() >= getTotalColumnCount();
|
||||
if (dx > 0) { // Contents are scrolling left
|
||||
//Check right bound
|
||||
if (rightBoundReached) {
|
||||
//If we've reached the last column, enforce limits
|
||||
int rightOffset = getHorizontalSpace() - getDecoratedRight(bottomView) + getPaddingRight();
|
||||
delta = Math.max(-dx, rightOffset);
|
||||
} else {
|
||||
//No limits while the last column isn't visible
|
||||
delta = -dx;
|
||||
}
|
||||
} else { // Contents are scrolling right
|
||||
//Check left bound
|
||||
if (leftBoundReached) {
|
||||
int leftOffset = -getDecoratedLeft(topView) + getPaddingLeft();
|
||||
delta = Math.min(-dx, leftOffset);
|
||||
} else {
|
||||
delta = -dx;
|
||||
}
|
||||
}
|
||||
|
||||
offsetChildrenHorizontal(delta);
|
||||
|
||||
if (dx > 0) {
|
||||
if (getDecoratedRight(topView) < 0 && !rightBoundReached) {
|
||||
fillGrid(DIRECTION_END, recycler, state);
|
||||
} else if (!rightBoundReached) {
|
||||
fillGrid(DIRECTION_NONE, recycler, state);
|
||||
}
|
||||
} else {
|
||||
if (getDecoratedLeft(topView) > 0 && !leftBoundReached) {
|
||||
fillGrid(DIRECTION_START, recycler, state);
|
||||
} else if (!leftBoundReached) {
|
||||
fillGrid(DIRECTION_NONE, recycler, state);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Return value determines if a boundary has been reached
|
||||
* (for edge effects and flings). If returned value does not
|
||||
* match original delta (passed in), RecyclerView will draw
|
||||
* an edge effect.
|
||||
*/
|
||||
return -delta;
|
||||
}
|
||||
|
||||
/*
|
||||
* Use this method to tell the RecyclerView if scrolling is even possible
|
||||
* in the vertical direction.
|
||||
*/
|
||||
@Override
|
||||
public boolean canScrollVertically() {
|
||||
//We do allow scrolling
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* This method describes how far RecyclerView thinks the contents should scroll vertically.
|
||||
* You are responsible for verifying edge boundaries, and determining if this scroll
|
||||
* event somehow requires that new views be added or old views get recycled.
|
||||
*/
|
||||
@Override
|
||||
public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
|
||||
if (getChildCount() == 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
//Take top measurements from the top-left child
|
||||
final View topView = getChildAt(0);
|
||||
//Take bottom measurements from the bottom-right child.
|
||||
final View bottomView = getChildAt(getChildCount()-1);
|
||||
|
||||
//Optimize the case where the entire data set is too small to scroll
|
||||
int viewSpan = getDecoratedBottom(bottomView) - getDecoratedTop(topView);
|
||||
if (viewSpan < getVerticalSpace()) {
|
||||
//We cannot scroll in either direction
|
||||
return 0;
|
||||
}
|
||||
|
||||
int delta;
|
||||
int maxRowCount = getTotalRowCount();
|
||||
boolean topBoundReached = getFirstVisibleRow() == 0;
|
||||
boolean bottomBoundReached = getLastVisibleRow() >= maxRowCount;
|
||||
if (dy > 0) { // Contents are scrolling up
|
||||
//Check against bottom bound
|
||||
if (bottomBoundReached) {
|
||||
//If we've reached the last row, enforce limits
|
||||
int bottomOffset;
|
||||
if (rowOfIndex(getChildCount() - 1) >= (maxRowCount - 1)) {
|
||||
//We are truly at the bottom, determine how far
|
||||
bottomOffset = getVerticalSpace() - getDecoratedBottom(bottomView)
|
||||
+ getPaddingBottom();
|
||||
} else {
|
||||
/*
|
||||
* Extra space added to account for allowing bottom space in the grid.
|
||||
* This occurs when the overlap in the last row is not large enough to
|
||||
* ensure that at least one element in that row isn't fully recycled.
|
||||
*/
|
||||
bottomOffset = getVerticalSpace() - (getDecoratedBottom(bottomView)
|
||||
+ mDecoratedChildHeight) + getPaddingBottom();
|
||||
}
|
||||
|
||||
delta = Math.max(-dy, bottomOffset);
|
||||
} else {
|
||||
//No limits while the last row isn't visible
|
||||
delta = -dy;
|
||||
}
|
||||
} else { // Contents are scrolling down
|
||||
//Check against top bound
|
||||
if (topBoundReached) {
|
||||
int topOffset = -getDecoratedTop(topView) + getPaddingTop();
|
||||
|
||||
delta = Math.min(-dy, topOffset);
|
||||
} else {
|
||||
delta = -dy;
|
||||
}
|
||||
}
|
||||
|
||||
offsetChildrenVertical(delta);
|
||||
|
||||
if (dy > 0) {
|
||||
if (getDecoratedBottom(topView) < 0 && !bottomBoundReached) {
|
||||
fillGrid(DIRECTION_DOWN, recycler, state);
|
||||
} else if (!bottomBoundReached) {
|
||||
fillGrid(DIRECTION_NONE, recycler, state);
|
||||
}
|
||||
} else {
|
||||
if (getDecoratedTop(topView) > 0 && !topBoundReached) {
|
||||
fillGrid(DIRECTION_UP, recycler, state);
|
||||
} else if (!topBoundReached) {
|
||||
fillGrid(DIRECTION_NONE, recycler, state);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Return value determines if a boundary has been reached
|
||||
* (for edge effects and flings). If returned value does not
|
||||
* match original delta (passed in), RecyclerView will draw
|
||||
* an edge effect.
|
||||
*/
|
||||
return -delta;
|
||||
}
|
||||
|
||||
/*
|
||||
* This is a helper method used by RecyclerView to determine
|
||||
* if a specific child view can be returned.
|
||||
*/
|
||||
@Override
|
||||
public View findViewByPosition(int position) {
|
||||
for (int i=0; i < getChildCount(); i++) {
|
||||
if (positionOfIndex(i) == position) {
|
||||
return getChildAt(i);
|
||||
}
|
||||
}
|
||||
|
||||
return null;
|
||||
}
|
||||
|
||||
/** Boilerplate to extend LayoutParams for tracking row/column of attached views */
|
||||
|
||||
/*
|
||||
* Even without extending LayoutParams, we must override this method
|
||||
* to provide the default layout parameters that each child view
|
||||
* will receive when added.
|
||||
*/
|
||||
@Override
|
||||
public RecyclerView.LayoutParams generateDefaultLayoutParams() {
|
||||
return new LayoutParams(
|
||||
ViewGroup.LayoutParams.WRAP_CONTENT,
|
||||
ViewGroup.LayoutParams.WRAP_CONTENT);
|
||||
}
|
||||
@Override
|
||||
public RecyclerView.LayoutParams generateLayoutParams(Context c, AttributeSet attrs) {
|
||||
return new LayoutParams(c, attrs);
|
||||
}
|
||||
@Override
|
||||
public RecyclerView.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) {
|
||||
if (lp instanceof ViewGroup.MarginLayoutParams) {
|
||||
return new LayoutParams((ViewGroup.MarginLayoutParams) lp);
|
||||
} else {
|
||||
return new LayoutParams(lp);
|
||||
}
|
||||
}
|
||||
@Override
|
||||
public boolean checkLayoutParams(RecyclerView.LayoutParams lp) {
|
||||
return lp instanceof LayoutParams;
|
||||
}
|
||||
|
||||
public static class LayoutParams extends RecyclerView.LayoutParams {
|
||||
|
||||
//Current row in the grid
|
||||
public int row;
|
||||
//Current column in the grid
|
||||
public int column;
|
||||
|
||||
public LayoutParams(Context c, AttributeSet attrs) {
|
||||
super(c, attrs);
|
||||
}
|
||||
public LayoutParams(int width, int height) {
|
||||
super(width, height);
|
||||
}
|
||||
public LayoutParams(ViewGroup.MarginLayoutParams source) {
|
||||
super(source);
|
||||
}
|
||||
public LayoutParams(ViewGroup.LayoutParams source) {
|
||||
super(source);
|
||||
}
|
||||
public LayoutParams(RecyclerView.LayoutParams source) {
|
||||
super(source);
|
||||
}
|
||||
}
|
||||
|
||||
/** Animation Layout Helpers */
|
||||
|
||||
/* Helper to obtain and place extra appearing views */
|
||||
private void layoutAppearingViews(RecyclerView.Recycler recycler, View referenceView, int referencePosition, int extraCount, int offset) {
|
||||
//Nothing to do...
|
||||
if (extraCount < 1) return;
|
||||
|
||||
//FIXME: This code currently causes double layout of views that are still visible…
|
||||
for (int extra = 1; extra <= extraCount; extra++) {
|
||||
//Grab the next position after the reference
|
||||
final int extraPosition = referencePosition + extra;
|
||||
if (extraPosition < 0 || extraPosition >= getItemCount()) {
|
||||
//Can't do anything with this
|
||||
continue;
|
||||
}
|
||||
|
||||
/*
|
||||
* Obtain additional position views that we expect to appear
|
||||
* as part of the animation.
|
||||
*/
|
||||
View appearing = recycler.getViewForPosition(extraPosition);
|
||||
addView(appearing);
|
||||
|
||||
//Find layout delta from reference position
|
||||
final int newRow = getGlobalRowOfPosition(extraPosition + offset);
|
||||
final int rowDelta = newRow - getGlobalRowOfPosition(referencePosition + offset);
|
||||
final int newCol = getGlobalColumnOfPosition(extraPosition + offset);
|
||||
final int colDelta = newCol - getGlobalColumnOfPosition(referencePosition + offset);
|
||||
|
||||
layoutTempChildView(appearing, rowDelta, colDelta, referenceView);
|
||||
}
|
||||
}
|
||||
|
||||
/* Helper to place a disappearing view */
|
||||
private void layoutDisappearingView(View disappearingChild) {
|
||||
/*
|
||||
* LayoutManager has a special method for attaching views that
|
||||
* will only be around long enough to animate.
|
||||
*/
|
||||
addDisappearingView(disappearingChild);
|
||||
|
||||
//Adjust each disappearing view to its proper place
|
||||
final LayoutParams lp = (LayoutParams) disappearingChild.getLayoutParams();
|
||||
|
||||
final int newRow = getGlobalRowOfPosition(lp.getViewAdapterPosition());
|
||||
final int rowDelta = newRow - lp.row;
|
||||
final int newCol = getGlobalColumnOfPosition(lp.getViewAdapterPosition());
|
||||
final int colDelta = newCol - lp.column;
|
||||
|
||||
layoutTempChildView(disappearingChild, rowDelta, colDelta, disappearingChild);
|
||||
}
|
||||
|
||||
|
||||
/* Helper to lay out appearing/disappearing children */
|
||||
private void layoutTempChildView(View child, int rowDelta, int colDelta, View referenceView) {
|
||||
//Set the layout position to the global row/column difference from the reference view
|
||||
int layoutTop = getDecoratedTop(referenceView) + rowDelta * mDecoratedChildHeight;
|
||||
int layoutLeft = getDecoratedLeft(referenceView) + colDelta * mDecoratedChildWidth;
|
||||
|
||||
measureChildWithMargins(child, 0, 0);
|
||||
layoutDecorated(child, layoutLeft, layoutTop,
|
||||
layoutLeft + mDecoratedChildWidth,
|
||||
layoutTop + mDecoratedChildHeight);
|
||||
}
|
||||
|
||||
/** Private Helpers and Metrics Accessors */
|
||||
|
||||
/* Return the overall column index of this position in the global layout */
|
||||
private int getGlobalColumnOfPosition(int position) {
|
||||
return position % mTotalColumnCount;
|
||||
}
|
||||
/* Return the overall row index of this position in the global layout */
|
||||
private int getGlobalRowOfPosition(int position) {
|
||||
return position / mTotalColumnCount;
|
||||
}
|
||||
|
||||
/*
|
||||
* Mapping between child view indices and adapter data
|
||||
* positions helps fill the proper views during scrolling.
|
||||
*/
|
||||
private int positionOfIndex(int childIndex) {
|
||||
int row = childIndex / mVisibleColumnCount;
|
||||
int column = childIndex % mVisibleColumnCount;
|
||||
|
||||
return mFirstVisiblePosition + (row * getTotalColumnCount()) + column;
|
||||
}
|
||||
|
||||
private int rowOfIndex(int childIndex) {
|
||||
int position = positionOfIndex(childIndex);
|
||||
|
||||
return position / getTotalColumnCount();
|
||||
}
|
||||
|
||||
private int getFirstVisibleColumn() {
|
||||
return (mFirstVisiblePosition % getTotalColumnCount());
|
||||
}
|
||||
|
||||
private int getLastVisibleColumn() {
|
||||
return getFirstVisibleColumn() + mVisibleColumnCount;
|
||||
}
|
||||
|
||||
private int getFirstVisibleRow() {
|
||||
return (mFirstVisiblePosition / getTotalColumnCount());
|
||||
}
|
||||
|
||||
private int getLastVisibleRow() {
|
||||
return getFirstVisibleRow() + mVisibleRowCount;
|
||||
}
|
||||
|
||||
private int getVisibleChildCount() {
|
||||
return mVisibleColumnCount * mVisibleRowCount;
|
||||
}
|
||||
|
||||
private int getTotalColumnCount() {
|
||||
if (getItemCount() < mTotalColumnCount) {
|
||||
return getItemCount();
|
||||
}
|
||||
|
||||
return mTotalColumnCount;
|
||||
}
|
||||
|
||||
private int getTotalRowCount() {
|
||||
if (getItemCount() == 0 || mTotalColumnCount == 0) {
|
||||
return 0;
|
||||
}
|
||||
int maxRow = getItemCount() / mTotalColumnCount;
|
||||
//Bump the row count if it's not exactly even
|
||||
if (getItemCount() % mTotalColumnCount != 0) {
|
||||
maxRow++;
|
||||
}
|
||||
|
||||
return maxRow;
|
||||
}
|
||||
|
||||
private int getHorizontalSpace() {
|
||||
return getWidth() - getPaddingRight() - getPaddingLeft();
|
||||
}
|
||||
|
||||
private int getVerticalSpace() {
|
||||
return getHeight() - getPaddingBottom() - getPaddingTop();
|
||||
}
|
||||
}
|
||||
|
|
@ -1,34 +1,19 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<androidx.constraintlayout.widget.ConstraintLayout
|
||||
xmlns:android="http://schemas.android.com/apk/res/android"
|
||||
xmlns:app="http://schemas.android.com/apk/res-auto"
|
||||
android:id="@+id/root"
|
||||
<FrameLayout
|
||||
xmlns:android="http://schemas.android.com/apk/res/android"
|
||||
android:layout_width="match_parent"
|
||||
android:layout_height="match_parent">
|
||||
|
||||
<androidx.recyclerview.widget.RecyclerView
|
||||
android:id="@+id/recyclerGrid"
|
||||
android:layout_width="match_parent"
|
||||
android:layout_height="match_parent"
|
||||
android:gravity="center">
|
||||
android:clipChildren="false"
|
||||
android:clipToPadding="false"
|
||||
android:fadeScrollbars="true"
|
||||
android:overScrollMode="never"
|
||||
android:padding="78dp"
|
||||
android:scrollbars="none"
|
||||
android:alpha="0" />
|
||||
|
||||
<dev.lucasnlm.antimine.common.level.view.UnlockedHorizontalScrollView
|
||||
android:id="@+id/bidirectionalScroll"
|
||||
android:layout_width="wrap_content"
|
||||
android:layout_height="wrap_content"
|
||||
android:fadeScrollbars="true"
|
||||
android:overScrollMode="never"
|
||||
android:scrollbars="none"
|
||||
app:layout_constraintBottom_toBottomOf="parent"
|
||||
app:layout_constraintEnd_toEndOf="parent"
|
||||
app:layout_constraintStart_toStartOf="parent"
|
||||
app:layout_constraintTop_toTopOf="parent">
|
||||
|
||||
<androidx.recyclerview.widget.RecyclerView
|
||||
android:id="@+id/recyclerGrid"
|
||||
android:layout_width="wrap_content"
|
||||
android:layout_height="wrap_content"
|
||||
android:clipChildren="false"
|
||||
android:clipToPadding="false"
|
||||
android:fadeScrollbars="true"
|
||||
android:overScrollMode="never"
|
||||
android:padding="78dp"
|
||||
android:scrollbars="none"/>
|
||||
|
||||
</dev.lucasnlm.antimine.common.level.view.UnlockedHorizontalScrollView>
|
||||
</androidx.constraintlayout.widget.ConstraintLayout>
|
||||
</FrameLayout>
|
||||
|
|
|
|||
|
|
@ -1,31 +1,20 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<androidx.constraintlayout.widget.ConstraintLayout
|
||||
<FrameLayout
|
||||
xmlns:android="http://schemas.android.com/apk/res/android"
|
||||
xmlns:app="http://schemas.android.com/apk/res-auto"
|
||||
android:layout_width="match_parent"
|
||||
android:layout_height="match_parent">
|
||||
|
||||
<dev.lucasnlm.antimine.common.level.view.UnlockedHorizontalScrollView
|
||||
android:id="@+id/bidirectionalScroll"
|
||||
android:layout_width="wrap_content"
|
||||
android:layout_height="wrap_content"
|
||||
<androidx.recyclerview.widget.RecyclerView
|
||||
android:id="@+id/recyclerGrid"
|
||||
android:layout_width="match_parent"
|
||||
android:layout_height="match_parent"
|
||||
android:clipChildren="false"
|
||||
android:clipToPadding="false"
|
||||
android:contentDescription="@null"
|
||||
android:fadeScrollbars="true"
|
||||
android:importantForAccessibility="no"
|
||||
android:overScrollMode="never"
|
||||
android:scrollbars="none"
|
||||
app:layout_constraintBottom_toBottomOf="parent"
|
||||
app:layout_constraintEnd_toEndOf="parent"
|
||||
app:layout_constraintStart_toStartOf="parent"
|
||||
app:layout_constraintTop_toTopOf="parent">
|
||||
android:alpha="0" />
|
||||
|
||||
<androidx.recyclerview.widget.RecyclerView
|
||||
android:id="@+id/recyclerGrid"
|
||||
android:layout_width="wrap_content"
|
||||
android:layout_height="wrap_content"
|
||||
android:contentDescription="@null"
|
||||
android:fadeScrollbars="true"
|
||||
android:importantForAccessibility="no"
|
||||
android:overScrollMode="never"
|
||||
android:scrollbars="none" />
|
||||
|
||||
</dev.lucasnlm.antimine.common.level.view.UnlockedHorizontalScrollView>
|
||||
</androidx.constraintlayout.widget.ConstraintLayout>
|
||||
</FrameLayout>
|
||||
|
|
|
|||
Loading…
Reference in a new issue