ca.farrelltonsolar.classic.MonthPager.java Source code

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Here is the source code for ca.farrelltonsolar.classic.MonthPager.java

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/*
 * Copyright (c) 2014. FarrelltonSolar
 *
 *  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 ca.farrelltonsolar.classic;

import android.app.Fragment;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import fr.castorflex.android.verticalviewpager.VerticalViewPager;

/**
 * Created by Graham on 03/01/2015.
 */
public class MonthPager extends Fragment {
    private static final float MIN_SCALE = 0.85f;
    private static final float MIN_ALPHA = 0.65f;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View theView = inflater.inflate(R.layout.day_logs_chart_pager, container, false);
        VerticalViewPager verticalViewPager = (VerticalViewPager) theView.findViewById(R.id.verticalviewpager);

        verticalViewPager.setAdapter(getAdapter());
        verticalViewPager.setPageMargin(getResources().getDimensionPixelSize(R.dimen.pagemargin));
        verticalViewPager
                .setPageMarginDrawable(new ColorDrawable(getResources().getColor(android.R.color.holo_green_dark)));

        verticalViewPager.setPageTransformer(true, new ViewPager.PageTransformer() {
            @Override
            public void transformPage(View view, float position) {
                int pageWidth = view.getWidth();
                int pageHeight = view.getHeight();

                if (position < -1) { // [-Infinity,-1)
                    // This page is way off-screen to the left.
                    view.setAlpha(0);

                } else if (position <= 1) { // [-1,1]
                    // Modify the default slide transition to shrink the page as well
                    float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
                    float vertMargin = pageHeight * (1 - scaleFactor) / 2;
                    float horzMargin = pageWidth * (1 - scaleFactor) / 2;
                    if (position < 0) {
                        view.setTranslationY(vertMargin - horzMargin / 2);
                    } else {
                        view.setTranslationY(-vertMargin + horzMargin / 2);
                    }

                    // Scale the page down (between MIN_SCALE and 1)
                    view.setScaleX(scaleFactor);
                    view.setScaleY(scaleFactor);

                    // Fade the page relative to its size.
                    view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE) / (1 - MIN_SCALE) * (1 - MIN_ALPHA));

                } else { // (1,+Infinity]
                    // This page is way off-screen to the right.
                    view.setAlpha(0);
                }
            }
        });
        return theView;
    }

    protected android.support.v4.view.PagerAdapter getAdapter() {
        return null;
    }

}