Android Open Source - muzei Multi Selection Controller

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2014 Google Inc.//from   www .ja va 2s  .c  om
 *
 * 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.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<>();
    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<>(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) {
        }
    };
}

Java Source Code List

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