Brandon Dayauon
6bebf0bb80
FastScrolling is jumping crazily when VerticalSnapPreference is set SNAP_TO_START, rather SNAP_TO_ANY may be better. bug:321835976 Test manual video: before: https://drive.google.com/file/d/1OOWESXjclndNgDklPq1BXR5HDehqJuPe/view?usp=sharing after: https://drive.google.com/file/d/1O6wRx4H9R-Di-lPTOY7SwrsxrBPhXHo-/view?usp=sharing Flag: n/a Change-Id: I6974c842aa88f6bc7df1011c05eecfde7dad766c
105 lines
3.2 KiB
Java
105 lines
3.2 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.allapps;
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import androidx.recyclerview.widget.LinearSmoothScroller;
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import androidx.recyclerview.widget.RecyclerView.ViewHolder;
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import com.android.launcher3.allapps.AlphabeticalAppsList.FastScrollSectionInfo;
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public class AllAppsFastScrollHelper {
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private static final int NO_POSITION = -1;
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private int mTargetFastScrollPosition = NO_POSITION;
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private AllAppsRecyclerView mRv;
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private ViewHolder mLastSelectedViewHolder;
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public AllAppsFastScrollHelper(AllAppsRecyclerView rv) {
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mRv = rv;
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}
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/**
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* Smooth scrolls the recycler view to the given section.
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*/
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public void smoothScrollToSection(FastScrollSectionInfo info) {
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if (mTargetFastScrollPosition == info.position) {
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return;
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}
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mTargetFastScrollPosition = info.position;
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mRv.getLayoutManager().startSmoothScroll(new MyScroller(mTargetFastScrollPosition));
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}
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public void onFastScrollCompleted() {
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mTargetFastScrollPosition = NO_POSITION;
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setLastHolderSelected(false);
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mLastSelectedViewHolder = null;
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}
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private void setLastHolderSelected(boolean isSelected) {
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if (mLastSelectedViewHolder != null) {
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mLastSelectedViewHolder.itemView.setActivated(isSelected);
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mLastSelectedViewHolder.setIsRecyclable(!isSelected);
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}
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}
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private class MyScroller extends LinearSmoothScroller {
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private final int mTargetPosition;
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public MyScroller(int targetPosition) {
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super(mRv.getContext());
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mTargetPosition = targetPosition;
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setTargetPosition(targetPosition);
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}
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@Override
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protected int getVerticalSnapPreference() {
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return SNAP_TO_ANY;
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}
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@Override
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protected void onStop() {
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super.onStop();
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if (mTargetPosition != mTargetFastScrollPosition) {
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// Target changed, before the last scroll can finish
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return;
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}
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ViewHolder currentHolder = mRv.findViewHolderForAdapterPosition(mTargetPosition);
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if (currentHolder == mLastSelectedViewHolder) {
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return;
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}
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setLastHolderSelected(false);
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mLastSelectedViewHolder = currentHolder;
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setLastHolderSelected(true);
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}
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@Override
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protected void onStart() {
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super.onStart();
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if (mTargetPosition != mTargetFastScrollPosition) {
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setLastHolderSelected(false);
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mLastSelectedViewHolder = null;
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}
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}
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}
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}
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