Class PdfView

android/src/main/java/org/wonday/pdf/PdfView.java:62–542

import org.wonday.pdf.events.TopChangeEvent;

public class PdfView extends PDFView implements OnPageChangeListener,OnLoadCompleteListener,OnErrorListener,OnTapListener,OnDrawListener,OnPageScrollListener, LinkHandler {
    private int page = 1;               // start from 1
    private boolean horizontal = false;
    private float scale = 1;
    private float minScale = 1;
    private float maxScale = 3;
    private String path;
    private int spacing = 10;
    private String password = "";
    private boolean enableAntialiasing = true;
    private boolean enableAnnotationRendering = true;
    private boolean enableDoubleTapZoom = true;

    private boolean enablePaging = false;
    private boolean autoSpacing = false;
    private boolean pageFling = false;
    private boolean pageSnap = false;
    private FitPolicy fitPolicy = FitPolicy.WIDTH;
    private boolean singlePage = false;
    private boolean scrollEnabled = true;
    private boolean enableRTL = false;

    private float originalWidth = 0;
    private float lastPageWidth = 0;
    private float lastPageHeight = 0;

    // used to store the parameters for `super.onSizeChanged`
    private int oldW = 0;
    private int oldH = 0;

    public PdfView(Context context, AttributeSet set){
        super(context, set);
    }

    @Override
    public void onPageChanged(int page, int numberOfPages) {
        // pdf lib page start from 0, convert it to our page (start from 1)
        page = page+1;
        this.page = page;
        showLog(format("%s %s / %s", path, page, numberOfPages));

        WritableMap event = Arguments.createMap();
        event.putString("message", "pageChanged|"+page+"|"+numberOfPages);

        ThemedReactContext context = (ThemedReactContext) getContext();
        EventDispatcher dispatcher = UIManagerHelper.getEventDispatcherForReactTag(context, getId());
        int surfaceId = UIManagerHelper.getSurfaceId(this);

        TopChangeEvent tce = new TopChangeEvent(surfaceId, getId(), event);

        if (dispatcher != null) {
            new Handler(Looper.getMainLooper()).postDelayed(() -> dispatcher.dispatchEvent(tce), 10);
        }

//        ReactContext reactContext = (ReactContext)this.getContext();
//        reactContext.getJSModule(RCTEventEmitter.class).receiveEvent(
//            this.getId(),
//            "topChange",