org.jamienicol.resistors.Resistor.java Source code

Introduction

Here is the source code for org.jamienicol.resistors.Resistor.java

Source

/*
 * Copyright (C) 2012 Jamie Nicol <jamie@thenicols.net>
 *
 * 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/>.
 */

package org.jamienicol.resistors;

import android.content.Context;
import android.support.v4.view.ViewPager.SimpleOnPageChangeListener;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import java.util.ArrayList;
import java.util.List;

public class Resistor extends LinearLayout {

    public interface OnResistanceChangeListener {
        public abstract void onResistanceChange(Resistance resistance);
    }

    private List<Band> bands;
    private Resistance resistance;
    private OnResistanceChangeListener onResistanceChangeListener;

    public Resistor(Context context) {
        this(context, null);
    }

    public Resistor(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public Resistor(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs);

        bands = new ArrayList<Band>();
        resistance = new Resistance();
        onResistanceChangeListener = null;
    }

    @Override
    protected void onFinishInflate() {

        /* update resistance when a band changes value */
        SimpleOnPageChangeListener listener = new SimpleOnPageChangeListener() {
            public void onPageSelected(int position) {
                updateResistance();
                if (onResistanceChangeListener != null) {
                    onResistanceChangeListener.onResistanceChange(resistance);
                }
            }
        };

        /* by the time this function is called all the child views
         * have been added. this means we have access to our bands.
         * set their listener and store them in a list so they
         * can be iterated through when calculating resistance */
        for (int i = 0; i < getChildCount(); i++) {
            View view = getChildAt(i);
            if (view instanceof Band) {
                Band band = (Band) view;
                bands.add(band);
                band.setOnPageChangeListener(listener);
            }
        }
        updateResistance();

        /* the docs say to always call the super method */
        super.onFinishInflate();
    }

    private void updateResistance() {
        resistance = new Resistance();
        for (Band band : bands) {
            band.processResistance(resistance);
        }
    }

    public Resistance getResistance() {
        return resistance;
    }

    public void setOnResistanceChangeListener(OnResistanceChangeListener listener) {
        onResistanceChangeListener = listener;
    }
}