package com.haicaojie.android.util;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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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.view.View;
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import com.haicaojie.android.R;
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/**
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* Created by weikou2015 on 2018/6/8.
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*/
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public class MyDividerItemDecoration extends RecyclerView.ItemDecoration {
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public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
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public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
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private Drawable mDivider;
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private int mOrientation;
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/**
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* 分割线缩进值
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*/
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private int inset;
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private Paint paint;
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/**
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* @param context
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* @param orientation layout的方向
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* @param drawable 引入的drawable的ID
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* @param inset 分割线缩进值
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*/
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public MyDividerItemDecoration(Context context, int orientation, int drawable, int inset) {
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mDivider = context.getResources().getDrawable(drawable);
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this.inset = inset;
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paint = new Paint();
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paint.setColor(context.getResources().getColor(R.color.white));
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paint.setStyle(Paint.Style.FILL);
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paint.setAntiAlias(true);
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setOrientation(orientation);
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}
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public void setOrientation(int orientation) {
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if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
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throw new IllegalArgumentException("invalid orientation");
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}
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mOrientation = orientation;
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}
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@Override
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public void onDraw(Canvas c, RecyclerView parent) {
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if (mOrientation == VERTICAL_LIST) {
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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 c, RecyclerView parent) {
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final int left = parent.getPaddingLeft();
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final int right = parent.getWidth() - parent.getPaddingRight();
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final int childCount = parent.getChildCount();
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//最后一个item不画分割线
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for (int i = 0; i < childCount - 1; i++) {
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final View child = parent.getChildAt(i);
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final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
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final int top = child.getBottom() + params.bottomMargin;
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final int bottom = top + mDivider.getIntrinsicHeight();
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if (inset > 0) {
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c.drawRect(left, top, right, bottom, paint);
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mDivider.setBounds(left + inset, top, right - inset, bottom);
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} else {
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mDivider.setBounds(left, top, right, bottom);
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}
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mDivider.draw(c);
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}
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}
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private void drawHorizontal(Canvas c, RecyclerView parent) {
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final int top = parent.getPaddingTop();
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final int bottom = parent.getHeight() - parent.getPaddingBottom();
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final int childCount = parent.getChildCount();
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for (int i = 0; i < childCount - 1; i++) {
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final View child = parent.getChildAt(i);
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final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
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final int left = child.getRight() + params.rightMargin;
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final int right = left + mDivider.getIntrinsicHeight();
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mDivider.setBounds(left, top, right, bottom);
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mDivider.draw(c);
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}
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}
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//由于Divider也有宽高,每一个Item需要向下或者向右偏移
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@Override
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public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
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if (mOrientation == VERTICAL_LIST) {
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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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