package com.wpc.library.recyclerviewhelper;
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/**
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* Created by weikou2015 on 2017/6/28.
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*/
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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 androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import android.view.View;
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/**
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* This class is from the v7 samples of the Android SDK. It's not by me!
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* <p/>
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* See the license above for details.
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*/
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public class DividerItemDecoration extends RecyclerView.ItemDecoration {
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/**
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* 水平方向
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*/
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public static final int HORIZONTAL = LinearLayoutManager.HORIZONTAL;
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/**
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* 垂直方向
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*/
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public static final int VERTICAL = LinearLayoutManager.VERTICAL;
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// 画笔
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private Paint paint;
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// 布局方向
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private int orientation = 2;
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// 分割线颜色
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private int color;
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//列数 暂定最多2列
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private int numColumn = 1;
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// 分割线尺寸
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private int size = 2;
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// 分割线尺寸
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private boolean haveHeader;
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//是否有分割线
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private boolean haveDivider = true;
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private boolean isSet = false;
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public DividerItemDecoration() {
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this(VERTICAL);
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orientation = 2;
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}
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public DividerItemDecoration(int orientation) {
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this.orientation = orientation;
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paint = new Paint();
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}
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@Override
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public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
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super.getItemOffsets(outRect, view, parent, state);
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int position = parent.getChildAdapterPosition(view);
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outRect.bottom = size * 2;
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if (numColumn > 1) {
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if (haveHeader) {
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if (position == 0) {
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return;
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} else {
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position -= 1;
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}
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}
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if (position % numColumn == 0) {
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outRect.right = size;
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} else if (position % numColumn == (numColumn - 1)) {
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outRect.left = size;
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} else {
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outRect.left = size;
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outRect.right = size;
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}
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}
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}
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@Override
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public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
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super.onDrawOver(c, parent, state);
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// if (orientation == VERTICAL) {
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// drawHorizontal(c, parent);
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// } else {
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// drawVertical(c, parent);
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// }
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}
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/**
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* 设置分割线颜色
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*
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* @param color 颜色
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*/
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public void setColor(int color) {
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this.color = color;
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paint.setColor(color);
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}
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/**
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* 设置列数
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*
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* @param numColumn 列数
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*/
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public void setNumColumn(int numColumn) {
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this.numColumn = numColumn;
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}
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/**
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* 是否加入header
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*
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* @param haveHeader header
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*/
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public void isHaveHeader(boolean haveHeader) {
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this.haveHeader = haveHeader;
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}
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/**
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* 是否加入header
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*
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* @param haveDivider header
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*/
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public void isHaveDivider(boolean haveDivider) {
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this.haveDivider = haveDivider;
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}
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/**
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* 设置分割线尺寸
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*
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* @param size 尺寸
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*/
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public void setSize(int size) {
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this.size = size;
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}
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// 绘制垂直分割线
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protected void drawVertical(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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int childCount = parent.getChildCount();
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for (int i = 0; i < childCount; i++) {
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if (haveHeader && i == 1 && !isSet) {
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isSet = true;
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continue;
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}
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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 + size;
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c.drawRect(left, top, right, bottom, paint);
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}
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}
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// 绘制水平分割线
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protected void drawHorizontal(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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for (int i = 0; i < childCount; i++) {
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if (haveHeader && i == 0 && !isSet) {
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isSet = true;
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continue;
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}
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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 + size;
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c.drawRect(left, top, right, bottom, paint);
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}
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}
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}
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