mirror of https://github.com/M66B/FairEmail.git
158 lines
5.3 KiB
Java
158 lines
5.3 KiB
Java
/*
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* Copyright 2017 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 androidx.recyclerview.selection;
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import static androidx.core.util.Preconditions.checkArgument;
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import android.graphics.Canvas;
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import android.graphics.Point;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.view.View;
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import androidx.annotation.DrawableRes;
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import androidx.annotation.NonNull;
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import androidx.core.content.ContextCompat;
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import androidx.recyclerview.selection.SelectionTracker.SelectionPredicate;
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import androidx.recyclerview.widget.GridLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.RecyclerView.ItemDecoration;
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import androidx.recyclerview.widget.RecyclerView.OnScrollListener;
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/**
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* RecyclerView backed {@link BandSelectionHelper.BandHost}.
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*/
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final class DefaultBandHost<K> extends GridModel.GridHost<K> {
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private static final Rect NILL_RECT = new Rect(0, 0, 0, 0);
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private final RecyclerView mRecyclerView;
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private final Drawable mBand;
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private final ItemKeyProvider<K> mKeyProvider;
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private final SelectionPredicate<K> mSelectionPredicate;
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DefaultBandHost(
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@NonNull RecyclerView recyclerView,
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@DrawableRes int bandOverlayId,
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@NonNull ItemKeyProvider<K> keyProvider,
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@NonNull SelectionPredicate<K> selectionPredicate) {
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checkArgument(recyclerView != null);
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mRecyclerView = recyclerView;
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mBand = ContextCompat.getDrawable(mRecyclerView.getContext(), bandOverlayId);
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checkArgument(mBand != null);
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checkArgument(keyProvider != null);
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checkArgument(selectionPredicate != null);
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mKeyProvider = keyProvider;
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mSelectionPredicate = selectionPredicate;
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mRecyclerView.addItemDecoration(
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new ItemDecoration() {
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@Override
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public void onDrawOver(
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Canvas canvas,
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RecyclerView unusedParent,
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RecyclerView.State unusedState) {
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DefaultBandHost.this.onDrawBand(canvas);
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}
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});
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}
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@Override
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GridModel<K> createGridModel() {
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return new GridModel<>(this, mKeyProvider, mSelectionPredicate);
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}
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@Override
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int getAdapterPositionAt(int index) {
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return mRecyclerView.getChildAdapterPosition(mRecyclerView.getChildAt(index));
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}
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@Override
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void addOnScrollListener(@NonNull OnScrollListener listener) {
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mRecyclerView.addOnScrollListener(listener);
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}
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@Override
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void removeOnScrollListener(@NonNull OnScrollListener listener) {
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mRecyclerView.removeOnScrollListener(listener);
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}
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@Override
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Point createAbsolutePoint(@NonNull Point relativePoint) {
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return new Point(relativePoint.x + mRecyclerView.computeHorizontalScrollOffset(),
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relativePoint.y + mRecyclerView.computeVerticalScrollOffset());
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}
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@Override
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Rect getAbsoluteRectForChildViewAt(int index) {
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final View child = mRecyclerView.getChildAt(index);
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final Rect childRect = new Rect();
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child.getHitRect(childRect);
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childRect.left += mRecyclerView.computeHorizontalScrollOffset();
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childRect.right += mRecyclerView.computeHorizontalScrollOffset();
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childRect.top += mRecyclerView.computeVerticalScrollOffset();
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childRect.bottom += mRecyclerView.computeVerticalScrollOffset();
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return childRect;
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}
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@Override
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int getVisibleChildCount() {
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return mRecyclerView.getChildCount();
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}
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@Override
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int getColumnCount() {
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RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager();
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if (layoutManager instanceof GridLayoutManager) {
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return ((GridLayoutManager) layoutManager).getSpanCount();
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}
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// Otherwise, it is a list with 1 column.
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return 1;
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}
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@Override
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void showBand(@NonNull Rect rect) {
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mBand.setBounds(rect);
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// TODO: mRecyclerView.invalidateItemDecorations() should work, but it isn't currently.
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// NOTE: That without invalidating rv, the band only gets updated
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// when the pointer moves off a the item view into "NO_POSITION" territory.
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mRecyclerView.invalidate();
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}
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@Override
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void hideBand() {
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mBand.setBounds(NILL_RECT);
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// TODO: mRecyclerView.invalidateItemDecorations() should work, but it isn't currently.
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mRecyclerView.invalidate();
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}
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@SuppressWarnings("WeakerAccess") /* synthetic access */
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void onDrawBand(@NonNull Canvas c) {
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mBand.draw(c);
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}
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@Override
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boolean hasView(int pos) {
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return mRecyclerView.findViewHolderForAdapterPosition(pos) != null;
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}
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}
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