ViewPager for Gesture Image View

CustomViewPager.java

import android.content.Context;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.RectF;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

import com.alexvasilkov.gestures.views.GestureImageView;

public class CustomViewPager extends ViewPager
{
    public CustomViewPager(Context context) {
        super(context);
    }

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

    @Override
    protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {

        if (v instanceof GestureImageView)
        {
            GestureImageView giv = (GestureImageView)v;
            float minZoom = giv.getController().getStateController().getEffectiveMinZoom();
            float zoom = giv.getController().getState().getZoom();

            float eps = 0.001f;

            // if zoom factor == min zoom factor => just let the view pager handle the scroll
//            L.d(this, L.logValues("minZoom", minZoom, "zoom", zoom, "dx", dx));
            if (Math.abs(minZoom - zoom) < eps)
                return false;

            RectF effectiveMovementArea = new RectF();
            giv.getController().getStateController().getEffectiveMovementArea(effectiveMovementArea, giv.getController().getState());
            float stateX = giv.getController().getState().getX();
            float width = effectiveMovementArea.width();

//            float distToLeftEdge = Math.abs(stateX);
//            float distToRightEdge = Math.abs(stateX + width);

//            L.d(this, L.logValues("effectiveMovementArea", effectiveMovementArea, "width", width, "stateX", stateX, "distToLeftEdge", distToLeftEdge, "distToRightEdge", distToRightEdge));

            // if user reached left edge && is swiping left => just let the view pager handle the scroll
            if (Math.abs(stateX) < eps && dx > 0)
                return false;

            // if user reached right edge && is swiping right => just let the view pager handle the scroll
            if (Math.abs(stateX + width) < eps && dx < 0)
                return false;

            return true;
        }
        else
            return super.canScroll(v, checkV, dx, x, y);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // only handle one finger touches! otherwise, the user probably does want to scale/pan
        if (event.getPointerCount() != 1)
            return false;
        return super.onTouchEvent(event);
    }
}