/*
 * Xournal++
 *
 * Page listener
 *
 * @author Xournal++ Team
 * https://github.com/xournalpp/xournalpp
 *
 * @license GNU GPLv2 or later
 */

#pragma once

#include <memory>

#include <util/Rectangle.h>

class Element;
class PageHandler;
class Range;

class PageListener {
public:
    PageListener();
    virtual ~PageListener();

public:
    void registerListener(std::shared_ptr<PageHandler> const& handler);
    void unregisterListener();

    virtual void rectChanged(Rectangle<double>& rect) {}
    virtual void rangeChanged(Range& range) {}
    virtual void elementChanged(Element* elem) {}
    virtual void pageChanged() {}

private:
    std::weak_ptr<PageHandler> handler;
};