Revert "Revert "Updating the scroll calculation from recyclerView to avoid view inflation""
Test: ABTD
https://android-build.googleplex.com/builds/abtd/run/L52600000956969786
This reverts commit cee6ddf3deaed339e6d6df7f1682c725a00197b9.
Reason for revert: Fixed in ag/20239136
Change-Id: I0e8446e66d9a86a94b40fcbd6de14da07abe8e5c
diff --git a/src/com/android/launcher3/FastScrollRecyclerView.java b/src/com/android/launcher3/FastScrollRecyclerView.java
index 747b755..2f927d3 100644
--- a/src/com/android/launcher3/FastScrollRecyclerView.java
+++ b/src/com/android/launcher3/FastScrollRecyclerView.java
@@ -24,7 +24,6 @@
import android.view.accessibility.AccessibilityNodeInfo;
import androidx.annotation.Nullable;
-import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.android.launcher3.compat.AccessibilityManagerCompat;
@@ -92,8 +91,7 @@
protected int getAvailableScrollHeight() {
// AvailableScrollHeight = Total height of the all items - first page height
int firstPageHeight = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
- int totalHeightOfAllItems = getItemsHeight(/* untilIndex= */ getAdapter().getItemCount());
- int availableScrollHeight = totalHeightOfAllItems - firstPageHeight;
+ int availableScrollHeight = computeVerticalScrollRange() - firstPageHeight;
return Math.max(0, availableScrollHeight);
}
@@ -146,10 +144,7 @@
// IF scroller is at the very top OR there is no scroll bar because there is probably not
// enough items to scroll, THEN it's okay for the container to be pulled down.
- if (getCurrentScrollY() == 0) {
- return true;
- }
- return getAdapter() == null || getAdapter().getItemCount() == 0;
+ return computeVerticalScrollOffset() == 0;
}
/**
@@ -160,53 +155,6 @@
}
/**
- * @return the scroll top of this recycler view.
- */
- public int getCurrentScrollY() {
- Adapter adapter = getAdapter();
- if (adapter == null) {
- return -1;
- }
- if (adapter.getItemCount() == 0 || getChildCount() == 0) {
- return -1;
- }
-
- int itemPosition = NO_POSITION;
- View child = null;
-
- LayoutManager layoutManager = getLayoutManager();
- if (layoutManager instanceof LinearLayoutManager) {
- // Use the LayoutManager as the source of truth for visible positions. During
- // animations, the view group child may not correspond to the visible views that appear
- // at the top.
- itemPosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
- child = layoutManager.findViewByPosition(itemPosition);
- }
-
- if (child == null) {
- // If the layout manager returns null for any reason, which can happen before layout
- // has occurred for the position, then look at the child of this view as a ViewGroup.
- child = getChildAt(0);
- itemPosition = getChildAdapterPosition(child);
- }
- if (itemPosition == NO_POSITION) {
- return -1;
- }
- return getPaddingTop() + getItemsHeight(itemPosition)
- - layoutManager.getDecoratedTop(child);
- }
-
- /**
- * Returns the sum of the height, in pixels, of this list adapter's items from index
- * 0 (inclusive) until {@code untilIndex} (exclusive). If untilIndex is same as the itemCount,
- * it returns the full height of all the items.
- *
- * <p>If the untilIndex is larger than the total number of items in this adapter, returns the
- * sum of all items' height.
- */
- protected abstract int getItemsHeight(int untilIndex);
-
- /**
* Maps the touch (from 0..1) to the adapter position that should be visible.
* <p>Override in each subclass of this base class.
*/
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 3abefe0..07d0f55 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2803,7 +2803,7 @@
View v = getFirstMatch(Collections.singletonList(activeRecyclerView),
preferredItem, packageAndUserAndApp);
- if (v != null && activeRecyclerView.getCurrentScrollY() > 0) {
+ if (v != null && activeRecyclerView.computeVerticalScrollOffset() > 0) {
RectF locationBounds = new RectF();
FloatingIconView.getLocationBoundsForView(this, v, false, locationBounds,
new Rect());
diff --git a/src/com/android/launcher3/allapps/AllAppsGridAdapter.java b/src/com/android/launcher3/allapps/AllAppsGridAdapter.java
index fe0230a..368a373 100644
--- a/src/com/android/launcher3/allapps/AllAppsGridAdapter.java
+++ b/src/com/android/launcher3/allapps/AllAppsGridAdapter.java
@@ -26,7 +26,9 @@
import androidx.core.view.accessibility.AccessibilityRecordCompat;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
+import com.android.launcher3.util.ScrollableLayoutManager;
import com.android.launcher3.views.ActivityContext;
import java.util.List;
@@ -66,10 +68,10 @@
/**
* A subclass of GridLayoutManager that overrides accessibility values during app search.
*/
- public class AppsGridLayoutManager extends GridLayoutManager {
+ public class AppsGridLayoutManager extends ScrollableLayoutManager {
public AppsGridLayoutManager(Context context) {
- super(context, 1, GridLayoutManager.VERTICAL, false);
+ super(context);
}
@Override
@@ -129,6 +131,15 @@
}
return extraRows;
}
+
+ @Override
+ protected int incrementTotalHeight(Adapter adapter, int position, int heightUntilLastPos) {
+ AllAppsGridAdapter.AdapterItem item = mApps.getAdapterItems().get(position);
+ // only account for the first icon in the row since they are the same size within a row
+ return (isIconViewType(item.viewType) && item.rowAppIndex != 0)
+ ? heightUntilLastPos
+ : (heightUntilLastPos + mCachedSizes.get(item.viewType));
+ }
}
@Override
diff --git a/src/com/android/launcher3/allapps/AllAppsRecyclerView.java b/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
index 0efa7c4..ac10892 100644
--- a/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
@@ -15,8 +15,6 @@
*/
package com.android.launcher3.allapps;
-import static android.view.View.MeasureSpec.UNSPECIFIED;
-
import static com.android.launcher3.logger.LauncherAtom.ContainerInfo;
import static com.android.launcher3.logger.LauncherAtom.SearchResultContainer;
import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_ALLAPPS_SCROLLED_DOWN;
@@ -30,7 +28,6 @@
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
-import android.util.SparseIntArray;
import androidx.recyclerview.widget.RecyclerView;
@@ -54,41 +51,11 @@
private static final boolean DEBUG = false;
private static final boolean DEBUG_LATENCY = Utilities.isPropertyEnabled(SEARCH_LOGGING);
- protected AlphabeticalAppsList<?> mApps;
protected final int mNumAppsPerRow;
-
- // The specific view heights that we use to calculate scroll
- private final SparseIntArray mViewHeights = new SparseIntArray();
- private final SparseIntArray mCachedScrollPositions = new SparseIntArray();
private final AllAppsFastScrollHelper mFastScrollHelper;
private int mCumulativeVerticalScroll;
-
- private final AdapterDataObserver mObserver = new RecyclerView.AdapterDataObserver() {
- public void onChanged() {
- mCachedScrollPositions.clear();
- }
-
- @Override
- public void onItemRangeChanged(int positionStart, int itemCount) {
- onChanged();
- }
-
- @Override
- public void onItemRangeInserted(int positionStart, int itemCount) {
- onChanged();
- }
-
- @Override
- public void onItemRangeRemoved(int positionStart, int itemCount) {
- onChanged();
- }
-
- @Override
- public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) {
- onChanged();
- }
- };
+ protected AlphabeticalAppsList<?> mApps;
public AllAppsRecyclerView(Context context) {
this(context, null);
@@ -128,12 +95,8 @@
pool.setMaxRecycledViews(AllAppsGridAdapter.VIEW_TYPE_ALL_APPS_DIVIDER, 1);
pool.setMaxRecycledViews(AllAppsGridAdapter.VIEW_TYPE_ICON, approxRows
* (mNumAppsPerRow + 1));
-
- mViewHeights.clear();
- mViewHeights.put(AllAppsGridAdapter.VIEW_TYPE_ICON, grid.allAppsCellHeightPx);
}
-
@Override
public void onDraw(Canvas c) {
if (DEBUG) {
@@ -213,17 +176,6 @@
}
@Override
- public void setAdapter(Adapter adapter) {
- if (getAdapter() != null) {
- getAdapter().unregisterAdapterDataObserver(mObserver);
- }
- super.setAdapter(adapter);
- if (adapter != null) {
- adapter.registerAdapterDataObserver(mObserver);
- }
- }
-
- @Override
protected boolean isPaddingOffsetRequired() {
return true;
}
@@ -244,13 +196,13 @@
List<AllAppsGridAdapter.AdapterItem> items = mApps.getAdapterItems();
// Skip early if there are no items or we haven't been measured
- if (items.isEmpty() || mNumAppsPerRow == 0) {
+ if (items.isEmpty() || mNumAppsPerRow == 0 || getChildCount() == 0) {
mScrollbar.setThumbOffsetY(-1);
return;
}
// Skip early if, there no child laid out in the container.
- int scrollY = getCurrentScrollY();
+ int scrollY = computeVerticalScrollOffset();
if (scrollY < 0) {
mScrollbar.setThumbOffsetY(-1);
return;
@@ -305,51 +257,6 @@
}
}
- @Override
- protected int getItemsHeight(int position) {
- List<AllAppsGridAdapter.AdapterItem> items = mApps.getAdapterItems();
- AllAppsGridAdapter.AdapterItem posItem = position < items.size()
- ? items.get(position) : null;
- int y = mCachedScrollPositions.get(position, -1);
- if (y < 0) {
- y = 0;
- for (int i = 0; i < position; i++) {
- AllAppsGridAdapter.AdapterItem item = items.get(i);
- if (AllAppsGridAdapter.isIconViewType(item.viewType)) {
- // Break once we reach the desired row
- if (posItem != null && posItem.viewType == item.viewType &&
- posItem.rowIndex == item.rowIndex) {
- break;
- }
- // Otherwise, only account for the first icon in the row since they are the same
- // size within a row
- if (item.rowAppIndex == 0) {
- y += mViewHeights.get(item.viewType, 0);
- }
- } else {
- // Rest of the views span the full width
- int elHeight = mViewHeights.get(item.viewType);
- if (elHeight == 0) {
- ViewHolder holder = findViewHolderForAdapterPosition(i);
- if (holder == null) {
- holder = getAdapter().createViewHolder(this, item.viewType);
- getAdapter().onBindViewHolder(holder, i);
- holder.itemView.measure(UNSPECIFIED, UNSPECIFIED);
- elHeight = holder.itemView.getMeasuredHeight();
-
- getRecycledViewPool().putRecycledView(holder);
- } else {
- elHeight = holder.itemView.getMeasuredHeight();
- }
- }
- y += elHeight;
- }
- }
- mCachedScrollPositions.put(position, y);
- }
- return y;
- }
-
public int getScrollBarTop() {
return getResources().getDimensionPixelOffset(R.dimen.all_apps_header_top_padding);
}
diff --git a/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java b/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java
index 70c1e18..7f6247e 100644
--- a/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java
@@ -106,7 +106,8 @@
new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
- updateHeaderScroll(((AllAppsRecyclerView) recyclerView).getCurrentScrollY());
+ updateHeaderScroll(
+ ((AllAppsRecyclerView) recyclerView).computeVerticalScrollOffset());
}
};
diff --git a/src/com/android/launcher3/allapps/FloatingHeaderView.java b/src/com/android/launcher3/allapps/FloatingHeaderView.java
index f31379e..1cbb0f9 100644
--- a/src/com/android/launcher3/allapps/FloatingHeaderView.java
+++ b/src/com/android/launcher3/allapps/FloatingHeaderView.java
@@ -68,7 +68,7 @@
mAnimator.cancel();
}
- int current = -mCurrentRV.getCurrentScrollY();
+ int current = -mCurrentRV.computeVerticalScrollOffset();
boolean headerCollapsed = mHeaderCollapsed;
moved(current);
applyVerticalMove();
diff --git a/src/com/android/launcher3/testing/TestInformationHandler.java b/src/com/android/launcher3/testing/TestInformationHandler.java
index d3c9bc9..269baf0 100644
--- a/src/com/android/launcher3/testing/TestInformationHandler.java
+++ b/src/com/android/launcher3/testing/TestInformationHandler.java
@@ -112,12 +112,12 @@
case TestProtocol.REQUEST_APPS_LIST_SCROLL_Y: {
return getLauncherUIProperty(Bundle::putInt,
- l -> l.getAppsView().getActiveRecyclerView().getCurrentScrollY());
+ l -> l.getAppsView().getActiveRecyclerView().computeVerticalScrollOffset());
}
case TestProtocol.REQUEST_WIDGETS_SCROLL_Y: {
return getLauncherUIProperty(Bundle::putInt,
- l -> WidgetsFullSheet.getWidgetsView(l).getCurrentScrollY());
+ l -> WidgetsFullSheet.getWidgetsView(l).computeVerticalScrollOffset());
}
case TestProtocol.REQUEST_TARGET_INSETS: {
diff --git a/src/com/android/launcher3/util/ScrollableLayoutManager.java b/src/com/android/launcher3/util/ScrollableLayoutManager.java
new file mode 100644
index 0000000..17eaefd
--- /dev/null
+++ b/src/com/android/launcher3/util/ScrollableLayoutManager.java
@@ -0,0 +1,183 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.launcher3.util;
+
+import android.content.Context;
+import android.util.SparseIntArray;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.GridLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
+import androidx.recyclerview.widget.RecyclerView.State;
+import androidx.recyclerview.widget.RecyclerView.ViewHolder;
+
+/**
+ * Extension of {@link GridLayoutManager} with support for smooth scrolling
+ */
+public class ScrollableLayoutManager extends GridLayoutManager {
+
+ // keyed on item type
+ protected final SparseIntArray mCachedSizes = new SparseIntArray();
+
+ private RecyclerView mRv;
+
+ /**
+ * Precalculated total height keyed on the item position. This is always incremental.
+ * Subclass can override {@link #incrementTotalHeight} to incorporate the layout logic.
+ * For example all-apps should have same values for items in same row,
+ * sample values: 0, 10, 10, 10, 10, 20, 20, 20, 20
+ * whereas widgets will have strictly increasing values
+ * sample values: 0, 10, 50, 60, 110
+ */
+
+ //
+ private int[] mTotalHeightCache = new int[1];
+ private int mLastValidHeightIndex = 0;
+
+ public ScrollableLayoutManager(Context context) {
+ super(context, 1, GridLayoutManager.VERTICAL, false);
+ }
+
+ @Override
+ public void onAttachedToWindow(RecyclerView view) {
+ super.onAttachedToWindow(view);
+ mRv = view;
+ }
+
+ @Override
+ public void layoutDecorated(@NonNull View child, int left, int top, int right, int bottom) {
+ super.layoutDecorated(child, left, top, right, bottom);
+ mCachedSizes.put(
+ mRv.getChildViewHolder(child).getItemViewType(), child.getMeasuredHeight());
+ }
+
+ @Override
+ public void layoutDecoratedWithMargins(@NonNull View child, int left, int top, int right,
+ int bottom) {
+ super.layoutDecoratedWithMargins(child, left, top, right, bottom);
+ mCachedSizes.put(
+ mRv.getChildViewHolder(child).getItemViewType(), child.getMeasuredHeight());
+ }
+
+ @Override
+ public int computeVerticalScrollExtent(State state) {
+ return mRv == null ? 0 : mRv.getHeight();
+ }
+
+ @Override
+ public int computeVerticalScrollOffset(State state) {
+ Adapter adapter = mRv == null ? null : mRv.getAdapter();
+ if (adapter == null) {
+ return 0;
+ }
+ if (adapter.getItemCount() == 0 || getChildCount() == 0) {
+ return 0;
+ }
+ View child = getChildAt(0);
+ ViewHolder holder = mRv.findContainingViewHolder(child);
+ if (holder == null) {
+ return 0;
+ }
+ int itemPosition = holder.getLayoutPosition();
+ if (itemPosition < 0) {
+ return 0;
+ }
+ return getPaddingTop() + getItemsHeight(adapter, itemPosition) - getDecoratedTop(child);
+ }
+
+ @Override
+ public int computeVerticalScrollRange(State state) {
+ Adapter adapter = mRv == null ? null : mRv.getAdapter();
+ return adapter == null ? 0 : getItemsHeight(adapter, adapter.getItemCount());
+ }
+
+ /**
+ * Returns the sum of the height, in pixels, of this list adapter's items from index
+ * 0 (inclusive) until {@code untilIndex} (exclusive). If untilIndex is same as the itemCount,
+ * it returns the full height of all the items.
+ *
+ * <p>If the untilIndex is larger than the total number of items in this adapter, returns the
+ * sum of all items' height.
+ */
+ private int getItemsHeight(Adapter adapter, int untilIndex) {
+ final int totalItems = adapter.getItemCount();
+ if (mTotalHeightCache.length < (totalItems + 1)) {
+ mTotalHeightCache = new int[totalItems + 1];
+ mLastValidHeightIndex = 0;
+ }
+ if (untilIndex > totalItems) {
+ untilIndex = totalItems;
+ } else if (untilIndex < 0) {
+ untilIndex = 0;
+ }
+ if (untilIndex <= mLastValidHeightIndex) {
+ return mTotalHeightCache[untilIndex];
+ }
+
+ int totalItemsHeight = mTotalHeightCache[mLastValidHeightIndex];
+ for (int i = mLastValidHeightIndex; i < untilIndex; i++) {
+ totalItemsHeight = incrementTotalHeight(adapter, i, totalItemsHeight);
+ mTotalHeightCache[i + 1] = totalItemsHeight;
+ }
+ mLastValidHeightIndex = untilIndex;
+ return totalItemsHeight;
+ }
+
+ /**
+ * The current implementation assumes a linear list with every item taking up the whole row.
+ * Subclasses should override this method to account for any spanning logic
+ */
+ protected int incrementTotalHeight(Adapter adapter, int position, int heightUntilLastPos) {
+ return heightUntilLastPos + mCachedSizes.get(adapter.getItemViewType(position));
+ }
+
+ private void invalidateScrollCache() {
+ mLastValidHeightIndex = 0;
+ }
+
+ @Override
+ public void onItemsAdded(RecyclerView recyclerView, int positionStart, int itemCount) {
+ super.onItemsAdded(recyclerView, positionStart, itemCount);
+ invalidateScrollCache();
+ }
+
+ @Override
+ public void onItemsChanged(RecyclerView recyclerView) {
+ super.onItemsChanged(recyclerView);
+ invalidateScrollCache();
+ }
+
+ @Override
+ public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) {
+ super.onItemsRemoved(recyclerView, positionStart, itemCount);
+ invalidateScrollCache();
+ }
+
+ @Override
+ public void onItemsMoved(RecyclerView recyclerView, int from, int to, int itemCount) {
+ super.onItemsMoved(recyclerView, from, to, itemCount);
+ invalidateScrollCache();
+ }
+
+ @Override
+ public void onItemsUpdated(RecyclerView recyclerView, int positionStart, int itemCount,
+ Object payload) {
+ super.onItemsUpdated(recyclerView, positionStart, itemCount, payload);
+ invalidateScrollCache();
+ }
+}
diff --git a/src/com/android/launcher3/views/RecyclerViewFastScroller.java b/src/com/android/launcher3/views/RecyclerViewFastScroller.java
index 40e4ce1..3af2e3c 100644
--- a/src/com/android/launcher3/views/RecyclerViewFastScroller.java
+++ b/src/com/android/launcher3/views/RecyclerViewFastScroller.java
@@ -119,7 +119,6 @@
// prevent jumping, this offset is applied as the user scrolls.
protected int mTouchOffsetY;
protected int mThumbOffsetY;
- protected int mRvOffsetY;
// Fast scroller popup
private TextView mPopupView;
@@ -207,16 +206,11 @@
public void setThumbOffsetY(int y) {
if (mThumbOffsetY == y) {
- int rvCurrentOffsetY = mRv.getCurrentScrollY();
- if (mRvOffsetY != rvCurrentOffsetY) {
- mRvOffsetY = mRv.getCurrentScrollY();
- }
return;
}
updatePopupY(y);
mThumbOffsetY = y;
invalidate();
- mRvOffsetY = mRv.getCurrentScrollY();
}
public int getThumbOffsetY() {
diff --git a/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java b/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java
index 35fa7a4..5969e3e 100644
--- a/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java
+++ b/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java
@@ -19,7 +19,6 @@
import android.content.Context;
import android.graphics.Point;
import android.util.AttributeSet;
-import android.util.SparseIntArray;
import android.view.MotionEvent;
import androidx.recyclerview.widget.LinearLayoutManager;
@@ -28,6 +27,7 @@
import com.android.launcher3.FastScrollRecyclerView;
import com.android.launcher3.R;
+import com.android.launcher3.util.ScrollableLayoutManager;
/**
* The widgets recycler view.
@@ -42,14 +42,6 @@
private boolean mTouchDownOnScroller;
private HeaderViewDimensionsProvider mHeaderViewDimensionsProvider;
- /**
- * There is always 1 or 0 item of VIEW_TYPE_WIDGETS_LIST. Other types have fixes sizes, so the
- * the size can be used for all other items of same type. Caching the last know size for
- * VIEW_TYPE_WIDGETS_LIST allows us to use it to estimate full size even when
- * VIEW_TYPE_WIDGETS_LIST is not visible on the screen.
- */
- private final SparseIntArray mCachedSizes = new SparseIntArray();
-
public WidgetsRecyclerView(Context context) {
this(context, null);
}
@@ -68,9 +60,7 @@
@Override
protected void onFinishInflate() {
super.onFinishInflate();
- // create a layout manager with Launcher's context so that scroll position
- // can be preserved during screen rotation.
- setLayoutManager(new LinearLayoutManager(getContext()));
+ setLayoutManager(new ScrollableLayoutManager(getContext()));
}
@Override
@@ -114,7 +104,7 @@
}
// Skip early if, there no child laid out in the container.
- int scrollY = getCurrentScrollY();
+ int scrollY = computeVerticalScrollOffset();
if (scrollY < 0) {
mScrollbar.setThumbOffsetY(-1);
return;
@@ -164,39 +154,6 @@
}
/**
- * Returns the sum of the height, in pixels, of this list adapter's items from index 0 until
- * {@code untilIndex}.
- *
- * <p>If the untilIndex is larger than the total number of items in this adapter, returns the
- * sum of all items' height.
- */
- @Override
- protected int getItemsHeight(int untilIndex) {
- // Initialize cache
- int childCount = getChildCount();
- int startPosition;
- if (childCount > 0
- && ((startPosition = getChildAdapterPosition(getChildAt(0))) != NO_POSITION)) {
- int loopCount = Math.min(getChildCount(), getAdapter().getItemCount() - startPosition);
- for (int i = 0; i < loopCount; i++) {
- mCachedSizes.put(
- mAdapter.getItemViewType(startPosition + i),
- getChildAt(i).getMeasuredHeight());
- }
- }
-
- if (untilIndex > mAdapter.getItems().size()) {
- untilIndex = mAdapter.getItems().size();
- }
- int totalItemsHeight = 0;
- for (int i = 0; i < untilIndex; i++) {
- int type = mAdapter.getItemViewType(i);
- totalItemsHeight += mCachedSizes.get(type);
- }
- return totalItemsHeight;
- }
-
- /**
* Provides dimensions of the header view that is shown at the top of a
* {@link WidgetsRecyclerView}.
*/