package com.beloo.widget.chipslayoutmanager;
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import android.util.SparseArray;
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import android.view.View;
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import androidx.recyclerview.widget.RecyclerView;
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import com.beloo.widget.chipslayoutmanager.layouter.ICanvas;
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import com.beloo.widget.chipslayoutmanager.layouter.IStateFactory;
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import java.util.List;
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class DisappearingViewsManager implements IDisappearingViewsManager {
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private ICanvas canvas;
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private ChildViewsIterable childViews;
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private IStateFactory stateFactory;
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/* in pre-layouter drawing we need item count with items will be actually deleted to pre-draw appearing items properly
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* buf value */
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private int deletingItemsOnScreenCount;
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DisappearingViewsManager(ICanvas canvas, ChildViewsIterable childViews, IStateFactory stateFactory) {
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this.canvas = canvas;
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this.childViews = childViews;
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this.stateFactory = stateFactory;
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}
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class DisappearingViewsContainer {
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private SparseArray<View> backwardViews = new SparseArray<>();
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private SparseArray<View> forwardViews = new SparseArray<>();
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int size() {
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return backwardViews.size() + forwardViews.size();
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}
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SparseArray<View> getBackwardViews() {
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return backwardViews;
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}
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SparseArray<View> getForwardViews() {
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return forwardViews;
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}
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}
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/** @return views which moved from screen, but not deleted*/
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@Override
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public DisappearingViewsContainer getDisappearingViews(RecyclerView.Recycler recycler) {
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final List<RecyclerView.ViewHolder> scrapList = recycler.getScrapList();
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DisappearingViewsContainer container = new DisappearingViewsContainer();
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for (RecyclerView.ViewHolder holder : scrapList) {
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final View child = holder.itemView;
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final RecyclerView.LayoutParams lp = (RecyclerView.LayoutParams) child.getLayoutParams();
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if (!lp.isItemRemoved()) {
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if (lp.getViewAdapterPosition() < canvas.getMinPositionOnScreen()) {
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container.backwardViews.put(lp.getViewAdapterPosition(), child);
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} else if (lp.getViewAdapterPosition() > canvas.getMaxPositionOnScreen()) {
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container.forwardViews.put(lp.getViewAdapterPosition(), child);
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}
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}
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}
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return container;
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}
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/** during pre-layout calculate approximate height which will be free after moving items offscreen (removed or moved)
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* @return approximate height of disappearing views. Could be bigger, than accurate value. */
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@Override
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public int calcDisappearingViewsLength(RecyclerView.Recycler recycler) {
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int removedLength = 0;
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Integer minStart = Integer.MAX_VALUE;
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Integer maxEnd = Integer.MIN_VALUE;
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for (View view : childViews) {
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RecyclerView.LayoutParams lp = (RecyclerView.LayoutParams) view.getLayoutParams();
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boolean probablyMovedFromScreen = false;
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if (!lp.isItemRemoved()) {
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//view won't be removed, but maybe it is moved offscreen
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int pos = lp.getViewLayoutPosition();
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pos = recycler.convertPreLayoutPositionToPostLayout(pos);
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probablyMovedFromScreen = pos < canvas.getMinPositionOnScreen() || pos > canvas.getMaxPositionOnScreen();
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}
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if (lp.isItemRemoved() || probablyMovedFromScreen) {
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deletingItemsOnScreenCount++;
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minStart = Math.min(minStart, stateFactory.getStart(view));
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maxEnd = Math.max(maxEnd, stateFactory.getEnd(view));
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}
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}
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if (minStart != Integer.MAX_VALUE) {
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removedLength = maxEnd - minStart;
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}
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return removedLength;
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}
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@Override
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public int getDeletingItemsOnScreenCount() {
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return deletingItemsOnScreenCount;
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}
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@Override
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public void reset() {
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deletingItemsOnScreenCount = 0;
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}
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}
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