mirror of
https://github.com/TeamNewPipe/NewPipe
synced 2024-06-27 07:33:20 +00:00
175 lines
6.0 KiB
Java
175 lines
6.0 KiB
Java
/*
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* Copyright (C) Eltex ltd 2019 <eltex@eltex-co.ru>
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* SuperScrollLayoutManager.java is part of NewPipe.
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*
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* NewPipe is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* NewPipe is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with NewPipe. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.schabi.newpipe.views;
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import android.content.Context;
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import android.graphics.Rect;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import java.util.ArrayList;
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public final class SuperScrollLayoutManager extends LinearLayoutManager {
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private final Rect handy = new Rect();
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private final ArrayList<View> focusables = new ArrayList<>();
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public SuperScrollLayoutManager(final Context context) {
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super(context);
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}
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@Override
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public boolean requestChildRectangleOnScreen(@NonNull final RecyclerView parent,
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@NonNull final View child,
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@NonNull final Rect rect,
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final boolean immediate,
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final boolean focusedChildVisible) {
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if (!parent.isInTouchMode()) {
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// only activate when in directional navigation mode (Android TV etc) — fine grained
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// touch scrolling is better served by nested scroll system
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if (!focusedChildVisible || getFocusedChild() == child) {
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handy.set(rect);
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parent.offsetDescendantRectToMyCoords(child, handy);
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parent.requestRectangleOnScreen(handy, immediate);
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}
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}
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return super.requestChildRectangleOnScreen(parent, child, rect, immediate,
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focusedChildVisible);
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}
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@Nullable
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@Override
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public View onInterceptFocusSearch(@NonNull final View focused, final int direction) {
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final View focusedItem = findContainingItemView(focused);
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if (focusedItem == null) {
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return super.onInterceptFocusSearch(focused, direction);
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}
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final int listDirection = getAbsoluteDirection(direction);
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if (listDirection == 0) {
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return super.onInterceptFocusSearch(focused, direction);
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}
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// FocusFinder has an oddity: it considers size of Views more important
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// than closeness to source View. This means, that big Views far away from current item
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// are preferred to smaller sub-View of closer item. Setting focusability of closer item
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// to FOCUS_AFTER_DESCENDANTS does not solve this, because ViewGroup#addFocusables omits
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// such parent itself from list, if any of children are focusable.
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// Fortunately we can intercept focus search and implement our own logic, based purely
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// on position along the LinearLayoutManager axis
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final ViewGroup recycler = (ViewGroup) focusedItem.getParent();
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final int sourcePosition = getPosition(focusedItem);
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if (sourcePosition == 0 && listDirection < 0) {
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return super.onInterceptFocusSearch(focused, direction);
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}
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View preferred = null;
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int distance = Integer.MAX_VALUE;
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focusables.clear();
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recycler.addFocusables(focusables, direction, recycler.isInTouchMode()
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? View.FOCUSABLES_TOUCH_MODE
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: View.FOCUSABLES_ALL);
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try {
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for (final View view : focusables) {
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if (view == focused || view == recycler) {
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continue;
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}
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if (view == focusedItem) {
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// do not pass focus back to the item View itself - it makes no sense
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// (we can still pass focus to it's children however)
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continue;
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}
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final int candidate = getDistance(sourcePosition, view, listDirection);
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if (candidate < 0) {
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continue;
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}
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if (candidate < distance) {
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distance = candidate;
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preferred = view;
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}
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}
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} finally {
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focusables.clear();
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}
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return preferred;
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}
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private int getAbsoluteDirection(final int direction) {
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switch (direction) {
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default:
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break;
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case View.FOCUS_FORWARD:
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return 1;
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case View.FOCUS_BACKWARD:
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return -1;
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}
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if (getOrientation() == RecyclerView.HORIZONTAL) {
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switch (direction) {
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default:
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break;
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case View.FOCUS_LEFT:
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return getReverseLayout() ? 1 : -1;
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case View.FOCUS_RIGHT:
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return getReverseLayout() ? -1 : 1;
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}
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} else {
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switch (direction) {
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default:
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break;
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case View.FOCUS_UP:
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return getReverseLayout() ? 1 : -1;
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case View.FOCUS_DOWN:
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return getReverseLayout() ? -1 : 1;
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}
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}
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return 0;
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}
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private int getDistance(final int sourcePosition, final View candidate, final int direction) {
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final View itemView = findContainingItemView(candidate);
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if (itemView == null) {
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return -1;
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}
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final int position = getPosition(itemView);
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return direction * (position - sourcePosition);
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}
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}
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