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Open Source (LGPL) JavaFX PDF Viewer

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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * GUIPageChanger.java
 * ---------------
 */

package org.jpedal.examples.viewer.gui.generic;

import org.jpedal.examples.viewer.Commands;
import org.jpedal.examples.viewer.Values;
import org.jpedal.examples.viewer.gui.GUI;

/**
 * Used
 *
 * @author Simon
 */
public abstract class GUIPageChanger {

    private final GUI gui;
    private final Values commonValues;
    private final int page;

    public GUIPageChanger(final GUI gui, final Values values, final int page) {
        this.gui = gui;
        this.commonValues = values;
        this.page = page + 1;
    }

    protected void handlePageChange() {
        if ((!Values.isProcessing()) && (commonValues.getCurrentPage() != page)) {

            //if loading on linearized thread, see if we can actually display
            if (!gui.getPdfDecoder().isPageAvailable(page)) {
                gui.showMessageDialog("Page " + page + " is not yet loaded");
                return;
            }
            gui.resetStatusMessage("");
            gui.getCommand().executeCommand(Commands.GOTO, new Object[]{Integer.toString(page)});
        }

    }
}