package com.doumee.lib_coremodel.binding.viewadapter.recyclerview;
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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.view.View;
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import androidx.recyclerview.widget.RecyclerView;
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/**
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* Created by goldze on 2017/6/16.
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*/
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public class DividerLine extends RecyclerView.ItemDecoration {
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private static final String TAG = DividerLine.class.getCanonicalName();
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//默认分隔线厚度为2dp
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private static final int DEFAULT_DIVIDER_SIZE = 1;
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//控制分隔线的属性,值为一个drawable
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private static final int ATTRS[] = {android.R.attr.listDivider};
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//divider对应的drawable
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private Drawable dividerDrawable;
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private Context mContext;
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private int dividerSize;
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//默认为null
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private LineDrawMode mMode = null;
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/**
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* 分隔线绘制模式,水平，垂直，两者都绘制
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*/
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public enum LineDrawMode {
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HORIZONTAL, VERTICAL, BOTH
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}
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public DividerLine(Context context) {
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mContext = context;
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//获取样式中对应的属性值
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TypedArray attrArray = context.obtainStyledAttributes(ATTRS);
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dividerDrawable = attrArray.getDrawable(0);
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attrArray.recycle();
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}
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public DividerLine(Context context, LineDrawMode mode) {
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this(context);
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mMode = mode;
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}
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public DividerLine(Context context, int dividerSize, LineDrawMode mode) {
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this(context, mode);
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this.dividerSize = dividerSize;
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}
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public int getDividerSize() {
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return dividerSize;
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}
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public void setDividerSize(int dividerSize) {
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this.dividerSize = dividerSize;
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}
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public LineDrawMode getMode() {
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return mMode;
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}
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public void setMode(LineDrawMode mode) {
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mMode = mode;
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}
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/**
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* Item绘制完毕之后绘制分隔线
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* 根据不同的模式绘制不同的分隔线
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*
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* @param c
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* @param parent
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* @param state
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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 (getMode() == null) {
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throw new IllegalStateException("assign LineDrawMode,please!");
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}
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switch (getMode()) {
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case VERTICAL:
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drawVertical(c, parent, state);
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break;
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case HORIZONTAL:
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drawHorizontal(c, parent, state);
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break;
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case BOTH:
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drawHorizontal(c, parent, state);
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drawVertical(c, parent, state);
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break;
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}
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}
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/**
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* 绘制垂直分隔线
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*
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* @param c
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* @param parent
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* @param state
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*/
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private void drawVertical(Canvas c, RecyclerView parent, RecyclerView.State state) {
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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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final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
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.getLayoutParams();
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final int top = child.getTop() - params.topMargin;
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final int bottom = child.getBottom() + params.bottomMargin;
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final int left = child.getRight() + params.rightMargin;
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final int right = getDividerSize() == 0 ? left + dip2px(mContext, DEFAULT_DIVIDER_SIZE) : left + getDividerSize();
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dividerDrawable.setBounds(left, top, right, bottom);
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dividerDrawable.draw(c);
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}
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}
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/**
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* 绘制水平分隔线
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*
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* @param c
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* @param parent
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* @param state
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*/
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private void drawHorizontal(Canvas c, RecyclerView parent, RecyclerView.State state) {
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int childCount = parent.getChildCount();
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for (int i = 0; i < childCount; i++) {
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//分别为每个item绘制分隔线,首先要计算出item的边缘在哪里,给分隔线定位,定界
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final View child = parent.getChildAt(i);
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//RecyclerView的LayoutManager继承自ViewGroup,支持了margin
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final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
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//child的左边缘(也是分隔线的左边)
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final int left = child.getLeft() - params.leftMargin;
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//child的底边缘(恰好是分隔线的顶边)
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final int top = child.getBottom() + params.topMargin;
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//child的右边(也是分隔线的右边)
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final int right = child.getRight() - params.rightMargin;
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//分隔线的底边所在的位置(那就是分隔线的顶边加上分隔线的高度)
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final int bottom = getDividerSize() == 0 ? top + dip2px(mContext, DEFAULT_DIVIDER_SIZE) : top + getDividerSize();
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dividerDrawable.setBounds(left, top, right, bottom);
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//画上去
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dividerDrawable.draw(c);
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}
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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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// outRect.bottom = getDividerSize() == 0 ? dip2px(mContext, DEFAULT_DIVIDER_SIZE) : getDividerSize();
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}
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/**
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* 将dip或dp值转换为px值，保证尺寸大小不变
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*
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* @param dipValue
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* @param context（DisplayMetrics类中属性density）
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* @return
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*/
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public static int dip2px(Context context, float dipValue) {
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float scale = context.getResources().getDisplayMetrics().density;
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return (int) (dipValue * scale + 0.5f);
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}
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}
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