mirror of https://github.com/NekoX-Dev/NekoX.git
191 lines
6.7 KiB
Java
191 lines
6.7 KiB
Java
/*
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* Copyright 2018 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.widget;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.util.Log;
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import android.view.View;
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import android.widget.LinearLayout;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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/**
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* DividerItemDecoration is a {@link RecyclerView.ItemDecoration} that can be used as a divider
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* between items of a {@link LinearLayoutManager}. It supports both {@link #HORIZONTAL} and
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* {@link #VERTICAL} orientations.
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*
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* <pre>
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* mDividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
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* mLayoutManager.getOrientation());
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* recyclerView.addItemDecoration(mDividerItemDecoration);
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* </pre>
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*/
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public class DividerItemDecoration extends RecyclerView.ItemDecoration {
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public static final int HORIZONTAL = LinearLayout.HORIZONTAL;
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public static final int VERTICAL = LinearLayout.VERTICAL;
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private static final String TAG = "DividerItem";
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private static final int[] ATTRS = new int[]{ android.R.attr.listDivider };
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private Drawable mDivider;
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/**
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* Current orientation. Either {@link #HORIZONTAL} or {@link #VERTICAL}.
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*/
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private int mOrientation;
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private final Rect mBounds = new Rect();
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/**
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* Creates a divider {@link RecyclerView.ItemDecoration} that can be used with a
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* {@link LinearLayoutManager}.
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*
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* @param context Current context, it will be used to access resources.
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* @param orientation Divider orientation. Should be {@link #HORIZONTAL} or {@link #VERTICAL}.
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*/
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public DividerItemDecoration(Context context, int orientation) {
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final TypedArray a = context.obtainStyledAttributes(ATTRS);
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mDivider = a.getDrawable(0);
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if (mDivider == null) {
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Log.w(TAG, "@android:attr/listDivider was not set in the theme used for this "
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+ "DividerItemDecoration. Please set that attribute all call setDrawable()");
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}
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a.recycle();
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setOrientation(orientation);
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}
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/**
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* Sets the orientation for this divider. This should be called if
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* {@link RecyclerView.LayoutManager} changes orientation.
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*
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* @param orientation {@link #HORIZONTAL} or {@link #VERTICAL}
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*/
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public void setOrientation(int orientation) {
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if (orientation != HORIZONTAL && orientation != VERTICAL) {
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throw new IllegalArgumentException(
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"Invalid orientation. It should be either HORIZONTAL or VERTICAL");
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}
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mOrientation = orientation;
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}
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/**
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* Sets the {@link Drawable} for this divider.
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*
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* @param drawable Drawable that should be used as a divider.
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*/
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public void setDrawable(@NonNull Drawable drawable) {
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if (drawable == null) {
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throw new IllegalArgumentException("Drawable cannot be null.");
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}
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mDivider = drawable;
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}
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/**
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* @return the {@link Drawable} for this divider.
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*/
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@Nullable
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public Drawable getDrawable() {
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return mDivider;
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}
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@Override
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public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
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if (parent.getLayoutManager() == null || mDivider == null) {
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return;
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}
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if (mOrientation == VERTICAL) {
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drawVertical(c, parent);
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} else {
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drawHorizontal(c, parent);
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}
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}
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private void drawVertical(Canvas canvas, RecyclerView parent) {
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canvas.save();
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final int left;
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final int right;
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//noinspection AndroidLintNewApi - NewApi lint fails to handle overrides.
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if (parent.getClipToPadding()) {
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left = parent.getPaddingLeft();
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right = parent.getWidth() - parent.getPaddingRight();
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canvas.clipRect(left, parent.getPaddingTop(), right,
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parent.getHeight() - parent.getPaddingBottom());
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} else {
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left = 0;
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right = parent.getWidth();
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}
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final int childCount = parent.getChildCount();
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for (int i = 0; i < childCount; i++) {
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final View child = parent.getChildAt(i);
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parent.getDecoratedBoundsWithMargins(child, mBounds);
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final int bottom = mBounds.bottom + Math.round(child.getTranslationY());
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final int top = bottom - mDivider.getIntrinsicHeight();
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mDivider.setBounds(left, top, right, bottom);
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mDivider.draw(canvas);
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}
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canvas.restore();
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}
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private void drawHorizontal(Canvas canvas, RecyclerView parent) {
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canvas.save();
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final int top;
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final int bottom;
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//noinspection AndroidLintNewApi - NewApi lint fails to handle overrides.
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if (parent.getClipToPadding()) {
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top = parent.getPaddingTop();
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bottom = parent.getHeight() - parent.getPaddingBottom();
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canvas.clipRect(parent.getPaddingLeft(), top,
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parent.getWidth() - parent.getPaddingRight(), bottom);
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} else {
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top = 0;
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bottom = parent.getHeight();
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}
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final int childCount = parent.getChildCount();
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for (int i = 0; i < childCount; i++) {
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final View child = parent.getChildAt(i);
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parent.getLayoutManager().getDecoratedBoundsWithMargins(child, mBounds);
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final int right = mBounds.right + Math.round(child.getTranslationX());
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final int left = right - mDivider.getIntrinsicWidth();
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mDivider.setBounds(left, top, right, bottom);
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mDivider.draw(canvas);
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}
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canvas.restore();
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}
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@Override
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public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
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RecyclerView.State state) {
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if (mDivider == null) {
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outRect.set(0, 0, 0, 0);
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return;
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}
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if (mOrientation == VERTICAL) {
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outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
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} else {
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outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
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}
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}
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}
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