content: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.knight.arch.ui.misc;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.graphics.Canvas;
  import android.graphics.Rect;
  import android.graphics.drawable.Drawable;
  import android.support.v4.view.ViewCompat;
  import android.support.v7.widget.LinearLayoutManager;
  import android.support.v7.widget.RecyclerView;
  import android.view.View;
  
  /**
   * @author andyiac
   * @date 15-8-4
   * @web http://blog.andyiac.com/
   */
  public class DividerItemDecoration extends RecyclerView.ItemDecoration {
      private static final int[] ATTRS = new int[]{
              android.R.attr.listDivider
      };
  
      public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
      public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
  
      private final boolean rtl;
      private final Drawable divider;
  
      private int orientation;
      private float paddingStart;
  
      public DividerItemDecoration(Context context, int orientation, float paddingStart, boolean rtl) {
          this.rtl = rtl;
  
          final TypedArray a = context.obtainStyledAttributes(ATTRS);
          divider = a.getDrawable(0);
          a.recycle();
          setOrientation(orientation);
          setPaddingStart(paddingStart);
      }
  
      public void setOrientation(int orientation) {
          if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
              throw new IllegalArgumentException("invalid orientation");
          }
          this.orientation = orientation;
      }
  
      public void setPaddingStart(float paddingStart) {
          if (paddingStart < 0) {
              throw new IllegalArgumentException("paddingStart < 0");
          }
          this.paddingStart = paddingStart;
      }
  
      @Override
      public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
          if (orientation == VERTICAL_LIST) {
              drawVertical(c, parent);
          } else {
              drawHorizontal(c, parent);
          }
      }
  
      public void drawVertical(Canvas c, RecyclerView parent) {
          final int left = (int) (parent.getPaddingLeft() + (rtl ? 0 : paddingStart));
          final int right =
                  (int) (parent.getWidth() - parent.getPaddingRight() + (rtl ? paddingStart : 0));
  
          final int childCount = parent.getChildCount();
          for (int i = 0; i < childCount; i++) {
              final View child = parent.getChildAt(i);
              final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
              final int top = child.getBottom() + params.bottomMargin +
                      Math.round(ViewCompat.getTranslationY(child));
              final int bottom = top + divider.getIntrinsicHeight();
              divider.setBounds(left, top, right, bottom);
              divider.draw(c);
          }
      }
  
      public void drawHorizontal(Canvas c, RecyclerView parent) {
          final int top = parent.getPaddingTop();
          final int bottom = parent.getHeight() - parent.getPaddingBottom();
  
          final int childCount = parent.getChildCount();
          for (int i = 0; i < childCount; i++) {
              final View child = parent.getChildAt(i);
              final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
              final int left = child.getRight() + params.rightMargin +
                      Math.round(ViewCompat.getTranslationX(child));
              final int right = left + divider.getIntrinsicHeight();
              divider.setBounds(left, top, right, bottom);
              divider.draw(c);
          }
      }
  
      @Override
      public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
                                 RecyclerView.State state) {
          if (orientation == VERTICAL_LIST) {
              outRect.set(0, 0, 0, divider.getIntrinsicHeight());
          } else {
              outRect.set(0, 0, divider.getIntrinsicWidth(), 0);
          }
      }
  }
  