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SpacesItemDecoration.java
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SpacesItemDecoration.java
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package me.jingbin.library.decoration;
/*
* Copyright 2019. Bin Jing (https://github.com/youlookwhat)
*
* 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.
*/
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.view.View;
import android.widget.LinearLayout;
import androidx.annotation.DrawableRes;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.RecyclerView;
import me.jingbin.library.ByRecyclerView;
/**
* 给 LinearLayoutManager 增加分割线,可设置去除首尾分割线个数
*
* @author jingbin
* https://github.com/youlookwhat/ByRecyclerView
*/
public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
public static final int HORIZONTAL = LinearLayout.HORIZONTAL;
public static final int VERTICAL = LinearLayout.VERTICAL;
private static final String TAG = "itemDivider";
private Context mContext;
private Drawable mDivider;
private Rect mBounds = new Rect();
/**
* 在AppTheme里配置 android:listDivider
*/
private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
/**
* 头部 不显示分割线的item个数 这里应该包含刷新头,
* 比如有一个headerView和有下拉刷新,则这里传 2
*/
private int mHeaderNoShowSize = 0;
/**
* 尾部 不显示分割线的item个数 默认不显示最后一个item的分割线
*/
private int mFooterNoShowSize = 1;
/**
* Current orientation. Either {@link #HORIZONTAL} or {@link #VERTICAL}.
*/
private int mOrientation;
private Paint mPaint;
/**
* 如果是横向 - 宽度
* 如果是纵向 - 高度
*/
private int mDividerSpacing;
/**
* 如果是横向 - 左边距
* 如果是纵向 - 上边距
*/
private int mLeftTopPadding;
/**
* 如果是横向 - 右边距
* 如果是纵向 - 下边距
*/
private int mRightBottomPadding;
private ByRecyclerView byRecyclerView;
public SpacesItemDecoration(Context context) {
this(context, VERTICAL, 0, 1);
}
public SpacesItemDecoration(Context context, int orientation) {
this(context, orientation, 0, 1);
}
public SpacesItemDecoration(Context context, int orientation, int headerNoShowSize) {
this(context, orientation, headerNoShowSize, 1);
}
/**
* Creates a divider {@link RecyclerView.ItemDecoration}
*
* @param context Current context, it will be used to access resources.
* @param orientation Divider orientation. Should be {@link #HORIZONTAL} or {@link #VERTICAL}.
* @param headerNoShowSize headerViewSize + RefreshViewSize
* @param footerNoShowSize footerViewSize
*/
public SpacesItemDecoration(Context context, int orientation, int headerNoShowSize, int footerNoShowSize) {
mContext = context;
mHeaderNoShowSize = headerNoShowSize;
mFooterNoShowSize = footerNoShowSize;
setOrientation(orientation);
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
}
/**
* Sets the orientation for this divider. This should be called if
* {@link RecyclerView.LayoutManager} changes orientation.
*
* @param orientation {@link #HORIZONTAL} or {@link #VERTICAL}
*/
public SpacesItemDecoration setOrientation(int orientation) {
if (orientation != HORIZONTAL && orientation != VERTICAL) {
throw new IllegalArgumentException("Invalid orientation. It should be either HORIZONTAL or VERTICAL");
}
mOrientation = orientation;
return this;
}
/**
* Sets the {@link Drawable} for this divider.
*
* @param drawable Drawable that should be used as a divider.
*/
public SpacesItemDecoration setDrawable(Drawable drawable) {
if (drawable == null) {
throw new IllegalArgumentException("drawable cannot be null.");
}
mDivider = drawable;
return this;
}
public SpacesItemDecoration setDrawable(@DrawableRes int id) {
setDrawable(ContextCompat.getDrawable(mContext, id));
return this;
}
@Override
public void onDraw(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
if (parent.getLayoutManager() == null || (mDivider == null && mPaint == null)) {
return;
}
if (mOrientation == VERTICAL) {
drawVertical(canvas, parent, state);
} else {
drawHorizontal(canvas, parent, state);
}
}
private void drawVertical(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
canvas.save();
final int left;
final int right;
//noinspection AndroidLintNewApi - NewApi lint fails to handle overrides.
if (parent.getClipToPadding()) {
left = parent.getPaddingLeft();
right = parent.getWidth() - parent.getPaddingRight();
canvas.clipRect(left, parent.getPaddingTop(), right, parent.getHeight() - parent.getPaddingBottom());
} else {
left = 0;
right = parent.getWidth();
}
final int childCount = parent.getChildCount();
final int lastPosition = state.getItemCount() - 1;
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
final int childRealPosition = parent.getChildAdapterPosition(child);
// 过滤到头部不显示的分割线
if (childRealPosition < mHeaderNoShowSize) {
continue;
}
// 过滤到尾部不显示的分割线
if (childRealPosition <= lastPosition - mFooterNoShowSize) {
if (mDivider != null) {
parent.getDecoratedBoundsWithMargins(child, mBounds);
final int bottom = mBounds.bottom + Math.round(child.getTranslationY());
final int top = bottom - mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int left1 = left + mLeftTopPadding;
int right1 = right - mRightBottomPadding;
int top1 = child.getBottom() + params.bottomMargin;
int bottom1 = top1 + mDividerSpacing;
canvas.drawRect(left1, top1, right1, bottom1, mPaint);
}
}
}
canvas.restore();
}
private void drawHorizontal(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
canvas.save();
final int top;
final int bottom;
//noinspection AndroidLintNewApi - NewApi lint fails to handle overrides.
if (parent.getClipToPadding()) {
top = parent.getPaddingTop();
bottom = parent.getHeight() - parent.getPaddingBottom();
canvas.clipRect(parent.getPaddingLeft(), top,
parent.getWidth() - parent.getPaddingRight(), bottom);
} else {
top = 0;
bottom = parent.getHeight();
}
final int childCount = parent.getChildCount();
final int lastPosition = state.getItemCount() - 1;
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
final int childRealPosition = parent.getChildAdapterPosition(child);
// 过滤到头部不显示的分割线
if (childRealPosition < mHeaderNoShowSize) {
continue;
}
// 过滤到尾部不显示的分割线
if (childRealPosition <= lastPosition - mFooterNoShowSize) {
if (mDivider != null) {
parent.getDecoratedBoundsWithMargins(child, mBounds);
final int right = mBounds.right + Math.round(child.getTranslationX());
final int left = right - mDivider.getIntrinsicWidth();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int left1 = child.getRight() + params.rightMargin;
int right1 = left1 + mDividerSpacing;
int top1 = top + mLeftTopPadding;
int bottom1 = bottom - mRightBottomPadding;
canvas.drawRect(left1, top1, right1, bottom1, mPaint);
}
}
}
canvas.restore();
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
if (mDivider == null && mPaint == null) {
outRect.set(0, 0, 0, 0);
return;
}
//parent.getChildCount() 不能拿到item的总数
int lastPosition = state.getItemCount() - 1;
int position = parent.getChildAdapterPosition(view);
boolean mScrollTopFix = false;
if (byRecyclerView == null && parent instanceof ByRecyclerView) {
byRecyclerView = (ByRecyclerView) parent;
}
if (byRecyclerView != null && byRecyclerView.isRefreshEnabled()) {
mScrollTopFix = true;
}
// 滚动条置顶
boolean isFixScrollTop = mScrollTopFix && position == 0;
boolean isShowDivider = mHeaderNoShowSize <= position && position <= lastPosition - mFooterNoShowSize;
if (mOrientation == VERTICAL) {
if (isFixScrollTop) {
outRect.set(0, 0, 0, 1);
} else if (isShowDivider) {
outRect.set(0, 0, 0, mDivider != null ? mDivider.getIntrinsicHeight() : mDividerSpacing);
} else {
outRect.set(0, 0, 0, 0);
}
} else {
if (isFixScrollTop) {
outRect.set(0, 0, 1, 0);
} else if (isShowDivider) {
outRect.set(0, 0, mDivider != null ? mDivider.getIntrinsicWidth() : mDividerSpacing, 0);
} else {
outRect.set(0, 0, 0, 0);
}
}
}
/**
* 设置不显示分割线的item位置与个数
*
* @param headerNoShowSize 头部 不显示分割线的item个数
* @param footerNoShowSize 尾部 不显示分割线的item个数,默认1,不显示最后一个,最后一个一般为加载更多view
*/
public SpacesItemDecoration setNoShowDivider(int headerNoShowSize, int footerNoShowSize) {
this.mHeaderNoShowSize = headerNoShowSize;
this.mFooterNoShowSize = footerNoShowSize;
return this;
}
/**
* 设置不显示头部分割线的item个数
*
* @param headerNoShowSize 头部 不显示分割线的item个数
*/
public SpacesItemDecoration setHeaderNoShowDivider(int headerNoShowSize) {
this.mHeaderNoShowSize = headerNoShowSize;
return this;
}
public SpacesItemDecoration setParam(int dividerColor, int dividerSpacing) {
return setParam(dividerColor, dividerSpacing, 0, 0);
}
/**
* 直接设置分割线颜色等,不设置drawable
*
* @param dividerColor 分割线颜色
* @param dividerSpacing 分割线间距
* @param leftTopPaddingDp 如果是横向 - 左边距
* 如果是纵向 - 上边距
* @param rightBottomPaddingDp 如果是横向 - 右边距
* 如果是纵向 - 下边距
*/
public SpacesItemDecoration setParam(int dividerColor, int dividerSpacing, float leftTopPaddingDp, float rightBottomPaddingDp) {
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.FILL);
mPaint.setColor(ContextCompat.getColor(mContext, dividerColor));
mDividerSpacing = dividerSpacing;
mLeftTopPadding = dip2px(leftTopPaddingDp);
mRightBottomPadding = dip2px(rightBottomPaddingDp);
mDivider = null;
return this;
}
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public int dip2px(float dpValue) {
final float scale = mContext.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}