/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cn.flightfeather.thirdapp.util.slideswaphelper;
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import android.graphics.Canvas;
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import android.support.v4.view.ViewCompat;
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import android.support.v7.widget.RecyclerView;
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import android.support.v7.widget.helper.ItemTouchHelper;
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import android.support.v7.widget.helper.ItemTouchUIUtil;
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import android.view.View;
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import cn.flightfeather.thirdapp.R;
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/**
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* Package private class to keep implementations. Putting them inside ItemTouchUIUtil makes them
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* public API, which is not desired in this case.
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*/
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class ItemTouchUIUtilImpl {
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static class Lollipop extends Honeycomb {
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@Override
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public void onDraw(Canvas c, RecyclerView recyclerView, View view,
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float dX, float dY, int actionState, boolean isCurrentlyActive) {
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if (isCurrentlyActive) {
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Object originalElevation = view.getTag(R.id.item_touch_helper_previous_elevation);
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if (originalElevation == null) {
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originalElevation = ViewCompat.getElevation(view);
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float newElevation = 1f + findMaxElevation(recyclerView, view);
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ViewCompat.setElevation(view, newElevation);
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view.setTag(R.id.item_touch_helper_previous_elevation, originalElevation);
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}
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}
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super.onDraw(c, recyclerView, view, dX, dY, actionState, isCurrentlyActive);
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}
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private float findMaxElevation(RecyclerView recyclerView, View itemView) {
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final int childCount = recyclerView.getChildCount();
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float max = 0;
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for (int i = 0; i < childCount; i++) {
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final View child = recyclerView.getChildAt(i);
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if (child == itemView) {
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continue;
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}
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final float elevation = ViewCompat.getElevation(child);
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if (elevation > max) {
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max = elevation;
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}
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}
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return max;
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}
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@Override
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public void clearView(View view) {
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final Object tag = view.getTag(R.id.item_touch_helper_previous_elevation);
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if (tag != null && tag instanceof Float) {
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ViewCompat.setElevation(view, (Float) tag);
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}
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view.setTag(R.id.item_touch_helper_previous_elevation, null);
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super.clearView(view);
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}
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}
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static class Honeycomb implements ItemTouchUIUtil {
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@Override
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public void clearView(View view) {
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ViewCompat.setTranslationX(view, 0f);
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ViewCompat.setTranslationY(view, 0f);
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}
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@Override
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public void onSelected(View view) {
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}
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@Override
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public void onDraw(Canvas c, RecyclerView recyclerView, View view,
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float dX, float dY, int actionState, boolean isCurrentlyActive) {
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ViewCompat.setTranslationX(view, dX);
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ViewCompat.setTranslationY(view, dY);
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}
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@Override
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public void onDrawOver(Canvas c, RecyclerView recyclerView,
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View view, float dX, float dY, int actionState, boolean isCurrentlyActive) {
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}
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}
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static class Gingerbread implements ItemTouchUIUtil {
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private void draw(Canvas c, RecyclerView parent, View view,
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float dX, float dY) {
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c.save();
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c.translate(dX, dY);
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parent.drawChild(c, view, 0);
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c.restore();
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}
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@Override
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public void clearView(View view) {
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view.setVisibility(View.VISIBLE);
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}
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@Override
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public void onSelected(View view) {
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view.setVisibility(View.INVISIBLE);
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}
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@Override
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public void onDraw(Canvas c, RecyclerView recyclerView, View view,
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float dX, float dY, int actionState, boolean isCurrentlyActive) {
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if (actionState != ItemTouchHelper.ACTION_STATE_DRAG) {
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draw(c, recyclerView, view, dX, dY);
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}
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}
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@Override
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public void onDrawOver(Canvas c, RecyclerView recyclerView,
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View view, float dX, float dY,
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int actionState, boolean isCurrentlyActive) {
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if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
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draw(c, recyclerView, view, dX, dY);
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}
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}
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}
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}
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