package com.lwkandroid.rcvadapter.utils;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.view.View;
import androidx.annotation.ColorInt;
import androidx.annotation.DrawableRes;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
/**
* Function:RecyclerView的分割线【适用于LinearLayoutMananger】
*/
public class RcvLinearDecoration extends RecyclerView.ItemDecoration
{
private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
//分割线drawable
private Drawable mDividerDrawable;
//绘制分割线的Paint
private Paint mDividerPaint;
//分割线大小
private int mDividerSize;
//分割线样式
private int mOrientation;
/**
* 创建默认竖直排列的分割线
*/
public static RcvLinearDecoration createDefaultVertical(Context context)
{
return new RcvLinearDecoration(context, LinearLayoutManager.VERTICAL);
}
/**
* 创建自定义色值默认竖直排列的分割线
*
* @param color 自定义色值
*/
public static RcvLinearDecoration createDefaultVertical(int color)
{
return new RcvLinearDecoration(color, LinearLayoutManager.VERTICAL);
}
/**
* 创建默认水平排列的分割线
*/
public static RcvLinearDecoration createDefaultHorizontal(Context context)
{
return new RcvLinearDecoration(context, LinearLayoutManager.HORIZONTAL);
}
/**
* 创建自定义色值默认水平排列的分割线
*
* @param color 自定义色值
*/
public static RcvLinearDecoration createDefaultHorizontal(int color)
{
return new RcvLinearDecoration(color, LinearLayoutManager.HORIZONTAL);
}
/**
* 默认Drawable分割线
*
* @param context 上下文
* @param orientation 排列方向
*/
public RcvLinearDecoration(Context context, int orientation)
{
setOrientation(orientation);
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDividerDrawable = a.getDrawable(0);
a.recycle();
if (orientation == LinearLayoutManager.VERTICAL)
{
mDividerSize = mDividerDrawable.getIntrinsicHeight();
} else
{
mDividerSize = mDividerDrawable.getIntrinsicWidth();
}
}
/**
* 自定义Drawable分割线
*
* @param context 上下文
* @param drawable 自定义分割线drawable
* @param orientation 排列方向
*/
public RcvLinearDecoration(Context context, Drawable drawable, int orientation)
{
setOrientation(orientation);
mDividerDrawable = drawable;
if (orientation == LinearLayoutManager.VERTICAL)
{
mDividerSize = mDividerDrawable.getIntrinsicHeight();
} else
{
mDividerSize = mDividerDrawable.getIntrinsicWidth();
}
}
/**
* 自定义Drawable分割线
*
* @param context 上下文
* @param drawableResId 自定义分割线drawable资源id
* @param orientation 排列方向
*/
public RcvLinearDecoration(Context context, @DrawableRes int drawableResId, int orientation)
{
setOrientation(orientation);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
{
mDividerDrawable = context.getResources().getDrawable(drawableResId, null);
} else
{
mDividerDrawable = context.getResources().getDrawable(drawableResId);
}
if (orientation == LinearLayoutManager.VERTICAL)
{
mDividerSize = mDividerDrawable.getIntrinsicHeight();
} else
{
mDividerSize = mDividerDrawable.getIntrinsicWidth();
}
}
/**
* 自定义Color分割线（宽度或者高度默认1px）
*
* @param color 色值
* @param orientation 排列方向
*/
public RcvLinearDecoration(@ColorInt int color, int orientation)
{
this(color, 1, orientation);
}
/**
* 自定义Color分割线
*
* @param color 色值
* @param size 分割线大小【单位px】当排列方向为竖直，size为高度，排列方向为横向，size为宽度
* @param orientation 排列方向
*/
public RcvLinearDecoration(@ColorInt int color, int size, int orientation)
{
this.mDividerSize = size;
setOrientation(orientation);
mDividerPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mDividerPaint.setColor(color);
mDividerPaint.setStyle(Paint.Style.FILL);
}
//设置排列方向
private void setOrientation(int orientation)
{
if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL)
{
throw new IllegalArgumentException("RcvLinearDecoration orientation must be LinearLayoutManager.VERTICAL or LinearLayoutManager.HORIZONTAL !!!");
}
mOrientation = orientation;
}
@Override
public void onDraw(Canvas c, RecyclerView parent)
{
if (mOrientation == LinearLayoutManager.VERTICAL)
{
drawVertical(c, parent);
} else
{
drawHorizontal(c, parent);
}
}
//绘制垂直排列分割线
private void drawVertical(Canvas c, RecyclerView parent)
{
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
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;
final int bottom = top + mDividerSize;
if (mDividerDrawable != null)
{
mDividerDrawable.setBounds(left, top, right, bottom);
mDividerDrawable.draw(c);
} else if (mDividerPaint != null)
{
c.drawRect(left, top, right, bottom, mDividerPaint);
}
}
}
//绘制水平排列分割线
private void drawHorizontal(Canvas c, RecyclerView parent)
{
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.getTop() + params.topMargin;
final int bottom = child.getBottom() + params.bottomMargin;
final int left = child.getRight() + params.rightMargin;
final int right = left + mDividerSize;
if (mDividerDrawable != null)
{
mDividerDrawable.setBounds(left, top, right, bottom);
mDividerDrawable.draw(c);
} else
{
c.drawRect(left, top, right, bottom, mDividerPaint);
}
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state)
{
super.getItemOffsets(outRect, view, parent, state);
if (mOrientation == LinearLayoutManager.VERTICAL)
{
outRect.set(0, 0, 0, mDividerSize);
} else
{
outRect.set(0, 0, mDividerSize, 0);
}
}
}
