com.mastercard.masterpasswallet.widgets.PagerContainer.java Source code

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Here is the source code for com.mastercard.masterpasswallet.widgets.PagerContainer.java

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/*
 *  ****************************************************************************
 *  Copyright (c) 2015, MasterCard International Incorporated and/or its
 *  affiliates. All rights reserved.
 *  <p/>
 *  The contents of this file may only be used subject to the MasterCard
 *  Mobile Payment SDK for MCBP and/or MasterCard Mobile MPP UI SDK
 *  Materials License.
 *  <p/>
 *  Please refer to the file LICENSE.TXT for full details.
 *  <p/>
 *  TO THE EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS", WITHOUT
 *  WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 *  WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NON INFRINGEMENT. TO THE EXTENT PERMITTED BY LAW, IN NO EVENT SHALL
 *  MASTERCARD OR ITS AFFILIATES BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 *  IN THE SOFTWARE.
 *  *****************************************************************************
 */

package com.mastercard.masterpasswallet.widgets;

import android.content.Context;
import android.graphics.Point;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;

/**
 * Custom layout for View Pager
 */
public class PagerContainer extends FrameLayout implements ViewPager.OnPageChangeListener {
    private ViewPager mPager;
    private boolean mNeedsRedraw = false;

    public PagerContainer(Context context) {
        super(context);
        init();
    }

    public PagerContainer(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public PagerContainer(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        //Disable clipping of children so non-selected pages are visible
        setClipChildren(false);

        //Child clipping doesn't work with hardware acceleration in Android 3.x/4.x
        //You need to set this value here if using hardware acceleration in an
        // application targeted at these releases.
        setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }

    @Override
    protected void onFinishInflate() {
        try {
            mPager = (ViewPager) getChildAt(0);
            mPager.setOnPageChangeListener(this);
        } catch (Exception e) {
            throw new IllegalStateException("The root child of PagerContainer must be a ViewPager");
        }
    }

    public ViewPager getViewPager() {
        return mPager;
    }

    private final Point mCenter = new Point();
    private final Point mInitialTouch = new Point();

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        mCenter.x = w / 2;
        mCenter.y = h / 2;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        //We capture any touches not already handled by the ViewPager
        // to implement scrolling from a touch outside the pager bounds.
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            mInitialTouch.x = (int) ev.getX();
            mInitialTouch.y = (int) ev.getY();
        default:
            ev.offsetLocation(mCenter.x - mInitialTouch.x, mCenter.y - mInitialTouch.y);
            break;
        }

        return mPager.dispatchTouchEvent(ev);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        //Force the container to redraw on scrolling.
        //Without this the outer pages render initially and then stay static
        if (mNeedsRedraw)
            invalidate();
    }

    @Override
    public void onPageSelected(int position) {
    }

    @Override
    public void onPageScrollStateChanged(int state) {
        mNeedsRedraw = (state != ViewPager.SCROLL_STATE_IDLE);
    }
}