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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@
 *
 * ---------------
 * ModeChange.java
 * ---------------
 */

package org.jpedal.examples.viewer.commands;

import java.awt.Component;
import java.awt.Dimension;

import javafx.application.Platform;
import javafx.stage.Stage;

import javax.swing.SwingUtilities;

import org.jpedal.PdfDecoderInt;
import org.jpedal.display.Display;
import org.jpedal.examples.viewer.Commands;
import org.jpedal.examples.viewer.SharedViewer;
import org.jpedal.examples.viewer.Values;
import org.jpedal.examples.viewer.gui.GUI;
import org.jpedal.gui.GUIFactory;

/**
 * @author markee
 */
class ModeChange {

    static void changeModeInSwing(final int mode, final PdfDecoderInt decode_pdf, final GUIFactory currentGUI, final Values commonValues) {

        if (SwingUtilities.isEventDispatchThread()) {

            currentGUI.setDisplayView(mode, Display.DISPLAY_CENTERED);

            chooseMode(decode_pdf, commonValues, currentGUI);

            currentGUI.getButtons().hideRedundentNavButtons(currentGUI);

            if (decode_pdf.getDisplayView() == Display.PAGEFLOW) {
                selectCurrentGui(currentGUI);
            } else {
                ((GUI) currentGUI).setSelectedComboIndex(Commands.ROTATION, 0);
                ((Component) currentGUI.getFrame()).setMinimumSize(new Dimension(0, 0));
            }

        } else {
            currentGUI.setCommandInThread(true);
            final Runnable doPaintComponent = new Runnable() {

                @Override
                public void run() {
                    currentGUI.setDisplayView(mode, Display.DISPLAY_CENTERED);

                    chooseMode(decode_pdf, commonValues, currentGUI);

                    currentGUI.getButtons().hideRedundentNavButtons(currentGUI);

                    if (decode_pdf.getDisplayView() == Display.PAGEFLOW) {
                        selectCurrentGui(currentGUI);
                    } else {
                        ((GUI) currentGUI).setSelectedComboIndex(Commands.ROTATION, 0);
                        ((Component) currentGUI.getFrame()).setMinimumSize(new Dimension(0, 0));
                    }
                    currentGUI.setExecutingCommand(false);
                }
            };
            SwingUtilities.invokeLater(doPaintComponent);
        }
    }

    static void changeModeInJavaFX(final int mode, final PdfDecoderInt decode_pdf, final GUIFactory currentGUI) {

        if (Platform.isFxApplicationThread()) {

            currentGUI.setDisplayView(mode, Display.DISPLAY_CENTERED);

            currentGUI.getButtons().hideRedundentNavButtons(currentGUI);
            ((GUI) currentGUI).setSelectedComboIndex(Commands.ROTATION, 0);
            final Stage stage = (Stage) currentGUI.getFrame();
            if (stage != null) {
                ((Stage) currentGUI.getFrame()).setMinWidth(0);
                ((Stage) currentGUI.getFrame()).setMinHeight(0);
            }

        } else {
            currentGUI.setCommandInThread(true);
            final Runnable doPaintComponent = new Runnable() {

                @Override
                public void run() {
                    currentGUI.setDisplayView(mode, Display.DISPLAY_CENTERED);

                    currentGUI.getButtons().hideRedundentNavButtons(currentGUI);

                    if (decode_pdf.getDisplayView() == Display.PAGEFLOW) {
                        selectCurrentGui(currentGUI);
                    } else {

                        ((GUI) currentGUI).setSelectedComboIndex(Commands.ROTATION, 0);

                        ((Stage) currentGUI.getFrame()).setMinWidth(0);
                        ((Stage) currentGUI.getFrame()).setMinHeight(0);
                    }
                }
            };
            Platform.runLater(doPaintComponent);
        }
    }

    static void chooseMode(final PdfDecoderInt decode_pdf, final Values commonValues, final GUIFactory currentGUI) {

        if (decode_pdf.getDisplayView() == Display.FACING) {

            //Ensure value is set correctly
            final boolean separateCoverOn = currentGUI.getProperties().getValue("separateCoverOn").equalsIgnoreCase("true");
            decode_pdf.getPages().setBoolean(Display.BoolValue.SEPARATE_COVER, separateCoverOn);

            int p = commonValues.getCurrentPage();
            if (decode_pdf.getPages().getBoolean(Display.BoolValue.SEPARATE_COVER) && ((p & 1) == 1 && p != 1)) {
                p--;
            } else if (!decode_pdf.getPages().getBoolean(Display.BoolValue.SEPARATE_COVER) && ((p & 1) == 0)) {
                p--;
            }
            commonValues.setCurrentPage(p);
            currentGUI.setPage(p);

            currentGUI.decodePage(); // Ensure all pages appear
        } else if (decode_pdf.getDisplayView() == Display.CONTINUOUS_FACING) {

            int p = commonValues.getCurrentPage();
            if ((p & 1) == 1 && p != 1) {
                p--;
            }
            commonValues.setCurrentPage(p);
            currentGUI.setPage(p);
        }
    }

    static void selectCurrentGui(final GUIFactory currentGUI) {
        currentGUI.decodePage(); // Ensure all pages appear
        if (((GUI) currentGUI).getSelectedComboIndex(Commands.SCALING) != 0) {
            ((GUI) currentGUI).setSelectedComboIndex(Commands.SCALING, 0);
            ((GUI) currentGUI).getSelectedComboItem(Commands.SCALING);
        }
        if (((GUI) currentGUI).getSelectedComboIndex(Commands.SCALING) == 0) {
            int w = currentGUI.getPdfDecoder().getPdfPageData().getCropBoxWidth(currentGUI.getValues().getCurrentPage()) / 2;
            int h = currentGUI.getPdfDecoder().getPdfPageData().getCropBoxHeight(currentGUI.getValues().getCurrentPage()) / 2;

            //Don't allow screen to set minimum to be too large
            if (w > 800) {
                w = 800;
            }
            if (h > 600) {
                h = 600;
            }

            if (SharedViewer.isFX()) {
                ((Stage) currentGUI.getFrame()).setMinWidth(w);
                ((Stage) currentGUI.getFrame()).setMinHeight(h);
            } else {
                ((Component) currentGUI.getFrame()).setMinimumSize(new Dimension(w, (h)));
            }
        }
    }

}