package com.beloo.widget.chipslayoutmanager.layouter;
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import androidx.annotation.CallSuper;
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import androidx.recyclerview.widget.RecyclerView;
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public class MeasureSupporter extends RecyclerView.AdapterDataObserver implements IMeasureSupporter {
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private RecyclerView.LayoutManager lm;
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private boolean isAfterRemoving;
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private int measuredWidth;
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private int measuredHeight;
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private boolean isRegistered;
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/**
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* width of RecyclerView before removing item
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*/
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private Integer beforeRemovingWidth = null;
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/**
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* width which we receive after {@link RecyclerView.LayoutManager#onLayoutChildren} method finished.
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* Contains correct width after auto-measuring
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*/
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private int autoMeasureWidth = 0;
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/**
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* height of RecyclerView before removing item
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*/
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private Integer beforeRemovingHeight = null;
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/**
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* height which we receive after {@link RecyclerView.LayoutManager#onLayoutChildren} method finished.
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* Contains correct height after auto-measuring
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*/
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private int autoMeasureHeight = 0;
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public MeasureSupporter(RecyclerView.LayoutManager lm) {
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this.lm = lm;
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}
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@Override
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public void onSizeChanged() {
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autoMeasureWidth = lm.getWidth();
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autoMeasureHeight = lm.getHeight();
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}
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boolean isAfterRemoving() {
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return isAfterRemoving;
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}
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@Override
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public int getMeasuredWidth() {
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return measuredWidth;
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}
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private void setMeasuredWidth(int measuredWidth) {
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this.measuredWidth = measuredWidth;
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}
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@Override
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public int getMeasuredHeight() {
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return measuredHeight;
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}
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@Override
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public boolean isRegistered() {
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return isRegistered;
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}
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@Override
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public void setRegistered(boolean isRegistered) {
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this.isRegistered = isRegistered;
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}
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private void setMeasuredHeight(int measuredHeight) {
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this.measuredHeight = measuredHeight;
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}
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@Override
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@CallSuper
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public void measure(int autoWidth, int autoHeight) {
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if (isAfterRemoving()) {
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setMeasuredWidth(Math.max(autoWidth, beforeRemovingWidth));
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setMeasuredHeight(Math.max(autoHeight, beforeRemovingHeight));
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} else {
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setMeasuredWidth(autoWidth);
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setMeasuredHeight(autoHeight);
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}
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}
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@Override
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public void onItemsRemoved(final RecyclerView recyclerView){
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//subscribe to next animations tick
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lm.postOnAnimation(new Runnable() {
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private void onFinished() {
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//when removing animation finished return auto-measuring back
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isAfterRemoving = false;
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// and process measure again
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lm.requestLayout();
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}
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@Override
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public void run() {
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if (recyclerView.getItemAnimator() != null) {
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//listen removing animation
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recyclerView.getItemAnimator().isRunning(new RecyclerView.ItemAnimator.ItemAnimatorFinishedListener() {
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@Override
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public void onAnimationsFinished() {
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onFinished();
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}
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});
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} else {
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onFinished();
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}
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}
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});
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}
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@Override
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@CallSuper
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public void onItemRangeRemoved(int positionStart, int itemCount) {
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super.onItemRangeRemoved(positionStart, itemCount);
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/** we detected removing event, so should process measuring manually
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* @see <a href="http://stackoverflow.com/questions/40242011/custom-recyclerviews-layoutmanager-automeasuring-after-animation-finished-on-i">Stack Overflow issue</a>
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*/
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isAfterRemoving = true;
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beforeRemovingWidth = autoMeasureWidth;
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beforeRemovingHeight = autoMeasureHeight;
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}
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}
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