at.jclehner.rxdroid.InfiniteViewPagerAdapter.java Source code

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Here is the source code for at.jclehner.rxdroid.InfiniteViewPagerAdapter.java

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/**
 * RxDroid - A Medication Reminder
 * Copyright (C) 2011-2013 Joseph Lehner <joseph.c.lehner@gmail.com>
 *
 *
 * RxDroid is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * RxDroid is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with RxDroid.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */

package at.jclehner.rxdroid;

import java.lang.ref.WeakReference;
import java.util.ArrayList;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import at.jclehner.rxdroid.util.Util;

public class InfiniteViewPagerAdapter extends PagerAdapter {
    private static final int PAGES_PER_SIDE = 10000;
    private static final int ITEM_COUNT = 2 * PAGES_PER_SIDE + 1;

    public static final int CENTER = PAGES_PER_SIDE + 1;
    public static final int MAX = ITEM_COUNT - 1;

    private ViewFactory mFactory;
    private int mCurrentItemIndex = -1;

    public interface ViewFactory {
        View makeView(int offset /*, boolean wasSlideLeft*/);
    }

    public InfiniteViewPagerAdapter(ViewFactory viewFactory) {
        mFactory = viewFactory;
    }

    public int getCurrentItemIndex() {
        return mCurrentItemIndex;
    }

    @Override
    public int getCount() {
        return ITEM_COUNT;
    }

    @Override
    public boolean isViewFromObject(View v, Object o) {
        return v == (View) o;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        if (mFactory == null)
            throw new IllegalStateException("No ViewFactory supplied");

        View v = mFactory.makeView(position - CENTER);
        Util.detachFromParent(v);
        container.addView(v);
        return v;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object item) {
        container.removeView((View) item);
    }

    @Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        super.setPrimaryItem(container, position, object);
        mCurrentItemIndex = position;
    }
}