/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.
*/
package com.loopeer.codereader.ui.decoration;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import com.loopeer.codereader.R;
public class DividerItemDecoration extends RecyclerView.ItemDecoration {
private static final int DEFAULT_DIVIDER_HEIGHT = 1;
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
protected int mOrientation;
protected int padding;
protected int startpadding;
protected int endpadding;
protected int dividerHeight;
protected Context mContext;
protected Paint mPaddingPaint;
protected Paint mDividerPaint;
public DividerItemDecoration(Context context) {
this(context, VERTICAL_LIST, -1, -1);
}
public DividerItemDecoration(Context context, int orientation) {
this(context, orientation, -1, -1);
}
public DividerItemDecoration(Context context, int orientation, int padding, int dividerHeight) {
setOrientation(orientation);
mContext = context;
init();
if (padding != -1) this.padding = padding;
updatePaddint();
if (dividerHeight != -1) this.dividerHeight = dividerHeight;
}
public DividerItemDecoration(Context context, int orientation, int startpadding, int endpadding, int dividerHeight) {
setOrientation(orientation);
mContext = context;
init();
if (startpadding != -1) this.startpadding = startpadding;
if (endpadding != -1) this.endpadding = endpadding;
if (dividerHeight != -1) this.dividerHeight = dividerHeight;
}
private void updatePaddint() {
startpadding = padding;
endpadding = padding;
}
private void init() {
padding = mContext.getResources().getDimensionPixelSize(R.dimen.medium_padding);
updatePaddint();
dividerHeight = DEFAULT_DIVIDER_HEIGHT;
mPaddingPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaddingPaint.setColor(ContextCompat.getColor(mContext, R.color.item_background));
mPaddingPaint.setStyle(Paint.Style.FILL);
mDividerPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mDividerPaint.setColor(ContextCompat.getColor(mContext, R.color.color_divider));
mDividerPaint.setStyle(Paint.Style.FILL);
}
public void setOrientation(int orientation) {
if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
throw new IllegalArgumentException("invalid orientation");
}
mOrientation = orientation;
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
super.onDraw(c, parent, state);
if (mOrientation == VERTICAL_LIST) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}
public 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 - 1; i++) {
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin +
Math.round(ViewCompat.getTranslationY(child));
final int bottom = top + dividerHeight;
c.drawRect(left, top, left + startpadding, bottom, mPaddingPaint);
c.drawRect(right - endpadding, top, right, bottom, mPaddingPaint);
c.drawRect(left + startpadding, top, right - endpadding, bottom, mDividerPaint);
}
}
public void drawHorizontal(Canvas c, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount - 1; i++) {
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
final int left = child.getRight() + params.rightMargin +
Math.round(ViewCompat.getTranslationX(child));
final int right = left + dividerHeight;
c.drawRect(left, top, right, top + startpadding, mPaddingPaint);
c.drawRect(left, bottom - endpadding, right, bottom, mPaddingPaint);
c.drawRect(left, top + startpadding, right, bottom - endpadding, mDividerPaint);
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
if (mOrientation == VERTICAL_LIST) {
if (parent.getChildAdapterPosition(view) != parent.getAdapter().getItemCount() - 1) {
outRect.set(0, 0, 0, dividerHeight);
} else {
outRect.set(0, 0, 0, 0);
}
} else {
if (parent.getChildAdapterPosition(view) != parent.getAdapter().getItemCount() - 1) {
outRect.set(0, 0, dividerHeight, 0);
} else {
outRect.set(0, 0, 0, 0);
}
}
}
}