com.so2.running.GraphAdapter.java Source code

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Here is the source code for com.so2.running.GraphAdapter.java

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/*
                RUNNING
   Copyright (C) 2015  Alessandro Mereu, Maurizio Romano, Matteo Enrico Serpi
    
   This program 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.
    
   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * This class manage the ViewPager in SessionDeatailFragment
 */

package com.so2.running;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;

public class GraphAdapter extends PagerAdapter {

    //Views, from left to right
    private ArrayList<View> views = new ArrayList<View>();

    //Tell the ViewPager where the page should be displayed, from left-to-right
    // If the page no longer exists, return POSITION_NONE
    @Override
    public int getItemPosition(Object object) {
        int index = views.indexOf(object);
        if (index == -1)
            //Macro from GraphAdapter
            return POSITION_NONE;
        else
            return index;
    }

    // Used by ViewPager, called when ViewPager needs a page to display
    public Object instantiateItem(ViewGroup container, int position) {
        View v = views.get(position);
        container.addView(v);
        return v;
    }

    //Called when ViewPager no longer needs a page to display
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(views.get(position));
    }

    // Returns the total number of pages that the ViewPage can display
    @Override
    public int getCount() {
        return views.size();
    }

    // Used by ViewPager.
    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    // Add "view" to right end of "views", returns the position of the new view
    public int addView(View v) {
        return addView(v, views.size());
    }

    // Add "view" at "position" to "views", returns position of new view
    public int addView(View v, int position) {
        views.add(position, v);
        return position;
    }

    // Removes "view" from "views", retuns position of removed view
    public int removeView(ViewPager pager, View v) {
        return removeView(pager, views.indexOf(v));
    }

    // Removes the "view" at "position" from "views", retuns position of removed view
    public int removeView(ViewPager pager, int position) {

        pager.setAdapter(null);
        views.remove(position);
        pager.setAdapter(this);

        return position;
    }

    // Returns the "view" at "position"
    public View getView(int position) {
        return views.get(position);
    }

}