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Resizing whole recycler with no views removing and inflating. #166

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Resizing whole recycler with no views removing and inflating. #166

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12 changes: 4 additions & 8 deletions library/src/main/java/com/yarolegovich/discretescrollview/DiscreteScrollLayoutManager.java
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Original file line number Diff line number Diff line change
Expand Up @@ -112,11 +112,10 @@ public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State
//won't be cleared until onLayoutCompleted
if (!isFirstOrEmptyLayout) {
isFirstOrEmptyLayout = recyclerViewProxy.getChildCount() == 0;
if (isFirstOrEmptyLayout) {
initChildDimensions(recycler);
}
}

initChildDimensions(recycler);

recyclerViewProxy.detachAndScrapAttachedViews(recycler);

fill(recycler);
Expand Down Expand Up @@ -145,7 +144,7 @@ public void onLayoutCompleted(RecyclerView.State state) {
}

protected void initChildDimensions(RecyclerView.Recycler recycler) {
View viewToMeasure = recyclerViewProxy.getMeasuredChildForAdapterPosition(0, recycler);
View viewToMeasure = recyclerViewProxy.getMeasuredChildForAdapterPosition(currentPosition, recycler);

int childViewWidth = recyclerViewProxy.getMeasuredWidthWithMargin(viewToMeasure);
int childViewHeight = recyclerViewProxy.getMeasuredHeightWithMargin(viewToMeasure);
Expand All @@ -158,8 +157,6 @@ protected void initChildDimensions(RecyclerView.Recycler recycler) {
childViewHeight);

extraLayoutSpace = scrollToChangeCurrent * offscreenItems;

recyclerViewProxy.detachAndScrapView(viewToMeasure, recycler);
}

protected void updateRecyclerDimensions(RecyclerView.State state) {
Expand All @@ -169,7 +166,6 @@ protected void updateRecyclerDimensions(RecyclerView.State state) {
if (dimensionsChanged) {
viewWidth = recyclerViewProxy.getWidth();
viewHeight = recyclerViewProxy.getHeight();
recyclerViewProxy.removeAllViews();
}
recyclerCenter.set(
recyclerViewProxy.getWidth() / 2,
Expand Down Expand Up @@ -224,7 +220,7 @@ protected void layoutView(RecyclerView.Recycler recycler, int position, Point vi
if (position < 0) return;
View v = detachedCache.get(position);
if (v == null) {
v = recyclerViewProxy.getMeasuredChildForAdapterPosition(position, recycler);
v = recyclerViewProxy.addMeasuredChildForAdapterPosition(position, recycler);
recyclerViewProxy.layoutDecoratedWithMargins(v,
viewCenter.x - childHalfWidth, viewCenter.y - childHalfHeight,
viewCenter.x + childHalfWidth, viewCenter.y + childHalfHeight);
Expand Down
12 changes: 10 additions & 2 deletions library/src/main/java/com/yarolegovich/discretescrollview/RecyclerViewProxy.java
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
package com.yarolegovich.discretescrollview;

import android.support.annotation.NonNull;
import android.support.v7.widget.LinearSmoothScroller;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
Expand Down Expand Up @@ -49,13 +48,22 @@ public int getItemCount() {
return layoutManager.getItemCount();
}

public View getMeasuredChildForAdapterPosition(int position, RecyclerView.Recycler recycler) {
public View addMeasuredChildForAdapterPosition(int position, RecyclerView.Recycler recycler) {
View view = recycler.getViewForPosition(position);
layoutManager.addView(view);
layoutManager.measureChildWithMargins(view, 0, 0);
return view;
}

public View getMeasuredChildForAdapterPosition(int position, RecyclerView.Recycler recycler) {
View view = layoutManager.findViewByPosition(position);
if (view == null) {
view = recycler.getViewForPosition(position);
}
layoutManager.measureChildWithMargins(view, 0, 0);
return view;
}

public void layoutDecoratedWithMargins(View v, int left, int top, int right, int bottom) {
layoutManager.layoutDecoratedWithMargins(v, left, top, right, bottom);
}
Expand Down
8 changes: 8 additions & 0 deletions library/src/test/java/com/yarolegovich/discretescrollview/stub/StubRecyclerViewProxy.java
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,14 @@ public int getItemCount() {
return adapterItemCount;
}

@Override
public View addMeasuredChildForAdapterPosition(int position, RecyclerView.Recycler recycler) {
if (position < adapterItemCount) {
return new StubChildInfo(0, position).view;
}
throw new IndexOutOfBoundsException();
}

@Override
public View getMeasuredChildForAdapterPosition(int position, RecyclerView.Recycler recycler) {
if (position < adapterItemCount) {
Expand Down