android.support.test.testapp.VerticalViewPager.java Source code

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Here is the source code for android.support.test.testapp.VerticalViewPager.java

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/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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 android.support.test.testapp;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

/**
 * Vertical ViewPager which overrides onTouchEvent to swap the MotionEvent
 */
public class VerticalViewPager extends ViewPager {

    public VerticalViewPager(Context context) {
        super(context);
        setPageTransformer(true, new VerticalPageTransformer());
        setOverScrollMode(OVER_SCROLL_NEVER);
    }

    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        setPageTransformer(true, new VerticalPageTransformer());
        setOverScrollMode(OVER_SCROLL_NEVER);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        event.setLocation(event.getY() * getWidth() / getHeight(), event.getX() * getHeight() / getWidth());
        return super.onTouchEvent(event);
    }

    /**
     * Vertical PageTransformer which changes the animation for from horizontal to vertical.
     */
    private class VerticalPageTransformer implements ViewPager.PageTransformer {

        @Override
        public void transformPage(View view, float position) {
            view.setTranslationX(-view.getWidth() * position);
            view.setTranslationY(view.getHeight() * position);
        }
    }
}