mirror of https://github.com/kurisufriend/Clover
Floens
7 years ago
parent
7d51aa1635
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/* |
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* Copyright (C) 2016 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 org.floens.chan.ui.view; |
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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.support.annotation.NonNull; |
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import android.support.v7.widget.LinearLayoutManager; |
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import android.support.v7.widget.RecyclerView; |
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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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/** |
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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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@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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// Clover changed: still apply insets even when it's not set to clipPadding, plus don't
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// clip the top and bottom.
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left = parent.getPaddingLeft(); |
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right = parent.getWidth() - parent.getPaddingRight(); |
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canvas.clipRect(left, 0, right, parent.getHeight()); |
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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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