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The source code is released under:
Apache License
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/* * Copyright 2014 Google Inc./*from w ww . j av a2 s .c o m*/ * * 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.google.android.apps.muzei.util; import android.net.Uri; import android.os.Bundle; import android.os.Parcelable; import java.util.HashSet; import java.util.Set; /** * Utilities for storing multiple selection information in collection views. */ public class MultiSelectionController<T extends Parcelable> { private String mStateKey; private Set<T> mSelection = new HashSet<T>(); private Callbacks mCallbacks = DUMMY_CALLBACKS; public MultiSelectionController(String stateKey) { mStateKey = stateKey; } public void restoreInstanceState(Bundle savedInstanceState) { if (savedInstanceState != null) { mSelection.clear(); Parcelable[] selection = savedInstanceState.getParcelableArray(mStateKey); if (selection != null && selection.length > 0) { for (Parcelable item : selection) { mSelection.add((T) item); } } } mCallbacks.onSelectionChanged(true, false); } public void saveInstanceState(Bundle outBundle) { Parcelable[] selection = new Parcelable[mSelection.size()]; int i = 0; for (Parcelable item : mSelection) { selection[i] = item; ++i; } outBundle.putParcelableArray(mStateKey, selection); } public void setCallbacks(Callbacks callbacks) { mCallbacks = callbacks; if (mCallbacks == null) { mCallbacks = DUMMY_CALLBACKS; } } public Set<T> getSelection() { return new HashSet<T>(mSelection); } public int getSelectedCount() { return mSelection.size(); } public boolean isSelecting() { return mSelection.size() > 0; } public void toggle(T item, boolean fromUser) { if (mSelection.contains(item)) { mSelection.remove(item); } else { mSelection.add(item); } mCallbacks.onSelectionChanged(false, fromUser); } public void reset(boolean fromUser) { mSelection.clear(); mCallbacks.onSelectionChanged(false, fromUser); } public boolean isSelected(T item) { return mSelection.contains(item); } public static interface Callbacks { void onSelectionChanged(boolean restored, boolean fromUser); } private static final Callbacks DUMMY_CALLBACKS = new Callbacks() { @Override public void onSelectionChanged(boolean restored, boolean fromUser) { } }; }