When I change the target version in the example module to 21, everything breaks. Is this because the library does not support it, or is it just the example app?

This implements a setOnPageChangeListener() for issue #10 and adds in a getViewPager() as forgotten about in issue #5.

Propose: increment to version 2.1.0 after this PR.

Please Review:

• @mluedke2

There's no way to add a page indicator at the moment (for example, ViewPagerIndicator). The ViewPager is created internally to the ParallaxContainer, so there's no way to connect it to a ViewPagerIndicator. This pull request adds a protected method that lets you create a subclass which lets you add a page indicator. The method signature is:

protected void attachOnPageChangeListener(ViewPager viewPager, ViewPager.OnPageChangeListener listener)

I've created a subclass for my project that looks like this:

package com.example;

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

import com.prolificinteractive.parallaxpager.ParallaxContainer;
import com.viewpagerindicator.PageIndicator;

public class PageIndicatorParallaxContainer extends ParallaxContainer {
    private PageIndicator mPageIndicator;

    @SuppressWarnings("UnusedDeclaration")
    public PageIndicatorParallaxContainer(Context context) {
        super(context);
    }

    @SuppressWarnings("UnusedDeclaration")
    public PageIndicatorParallaxContainer(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @SuppressWarnings("UnusedDeclaration")
    public PageIndicatorParallaxContainer(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void attachOnPageChangeListener(ViewPager viewPager,
                                              ViewPager.OnPageChangeListener listener) {
        if (mPageIndicator != null) {
            mPageIndicator.setOnPageChangeListener(listener);
            mPageIndicator.setViewPager(viewPager);

        } else {
            viewPager.setOnPageChangeListener(listener);
        }
    }

    public void setPageIndicator(PageIndicator pageIndicator) {
        this.mPageIndicator = pageIndicator;
    }
}

I don't think this class belongs in the ParallaxPager package, but it's a good example.

I've found that views inflated by the ParallaxLayoutInflater are unresponsive to touch events. I have a button in the last layout (of 5) used with the ParallaxContainer, but I am not receiving an OnClick callback when I press the button. I've tried setting the clickable/enabled attributes of the button from within and from outside of the ParallaxContainer, but it didn't help.

All components of the layout file are always visible, even if their visibility was set to invisible/gone. I'm performing some animations once the page is scrolled that require some components to not be visible.

This is because of the code in ParallaxContainer in onPageScrolled sets the visibility to VISIBLE when the page is on the screen, and GONE when it's off the screen.

I suggest only changing visibility if the layout hasn't set it to INVISIBLE, but I'm not sure if that would be too obscure for future users of your library. I can put a PR up doing that if you agree.

Thanks!

hi, i tried out your lib, looked like it's exactly what i need. faced the problem that all views disappear after scrolling has finished, only the last view i added in setupChildren() remains visible. any hints on this ? using 2.2.1 and followed exactly the example

I ran into this issue and saw that it was fixed in one of the more recent commits: https://github.com/prolificinteractive/ParallaxPager/commit/a3829d9443de78169e0d94a29a7f2e7d3987f663

Will the version on Maven Central be updated with this fix?

Thanks!

There isn't currently a straightforward way to allow for tracking the pageChange event. For example, if I have 3 pages scrolling through using ParallaxPager, and I want some images to change or animation to happen once the user scrolls to the 3rd page. Since ParallaxContainer is the pageChangeEventListener and does not allow for setting a new one, it seems the only solution would be to subclass PrallaxContainer.

Is it possible to attach a pageChangeListener to ParallaxContainer instead?

Thanks!

The Parallax Pager isn't working with CirclePageIndicator. I tried:

pageIndicator.setViewPager(parallaxContainer.getViewPager());

This causes the Parallax Pager to start on the last page and it can't be scrolled (only the pager indicator is moving).

Copied a lot of work from the Calligraphy project to fix issue #7.

It also appears that wrapping the Context multiple times no longer works, so to use Calligraphy in conjunction a work around was created.

Example project now uses the AppCompat library.

• [ ] title bg shouldn't be solid? I see it cutting off planets that move through title region
• [x] no longer need SupportFragmentManager, no longer requires FragmentActivity

Hi, Right now page one is overlapped by page two, instead I would like the first page to be on top. How do I accomplish this (reversing z-order of pages)?

With the standard ViewPager you could use setPageTransformer(boolean reverseDrawingOrder, PageTransformer transformer) and set reverseDrawingOrder to true, but this doesn't seem to have any effect.