com.cuddlesoft.nori.view.ImageViewerPager.java Source code

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Here is the source code for com.cuddlesoft.nori.view.ImageViewerPager.java

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/*
 * This file is part of nori.
 * Copyright (c) 2014 vomitcuddle <shinku@dollbooru.org>
 * License: ISC
 */

package com.cuddlesoft.nori.view;

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

import com.cuddlesoft.nori.fragment.ImageFragment;

/**
 * View pager used in {@link com.cuddlesoft.nori.ImageViewerActivity}. Gives touch event precedence to
 * multi-touch events sent to the {@link com.ortiz.touch.TouchImageView} in the contained fragment.
 */
@SuppressWarnings("UnusedDeclaration")
public class ImageViewerPager extends ViewPager {
    /** Gets notified when a {@link android.view.MotionEvent} is intercepted by this view. */
    // Can't use OnGenericMotionEventListener, because it requires API>=12
    private OnMotionEventListener onMotionEventListener;

    public ImageViewerPager(Context context) {
        super(context);
    }

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

    public void setOnMotionEventListener(OnMotionEventListener listener) {
        onMotionEventListener = listener;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (onMotionEventListener != null) {
            onMotionEventListener.onMotionEvent(ev);
        }
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        // Needed to intercept touch events before the ImageView in the child view has loaded.
        if (onMotionEventListener != null) {
            onMotionEventListener.onMotionEvent(ev);
        }
        return super.onTouchEvent(ev);
    }

    @Override
    protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
        // Make sure the ImageViewerFragment isn't currently panning a zoomed in image.
        // #instantiateItem() seems to be the "least awful" way to get the current item.
        ImageFragment imageFragment = (ImageFragment) getAdapter().instantiateItem(null, getCurrentItem());
        if (imageFragment != null) {
            return imageFragment.canScroll(-dx);
        }
        return super.canScroll(v, checkV, dx, x, y);
    }

    public static interface OnMotionEventListener {
        /**
         * Notifies the listener that a touch event has been intercepted.
         *
         * @param ev Motion event intercepted.
         */
        public void onMotionEvent(MotionEvent ev);
    }
}