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Scenic View is a JavaFX application designed to make it simple to understand the current state of your application scenegraph, and to also easily manipulate properties of the scenegraph without having to keep editing your code. This lets you find bugs, and get things pixel perfect without having to do the compile-check-compile dance.

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/*
 * Scenic View, 
 * Copyright (C) 2012 Jonathan Giles, Ander Ruiz, Amy Fowler 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.fxconnector.helper;

import java.io.File;
import java.net.URL;
import java.util.*;

import org.scenicview.utils.ExceptionLogger;

import javafx.application.Platform;
import javafx.scene.Scene;

public class StyleSheetRefresher extends WorkerThread {
    final Scene scene;
    long lastModified = System.currentTimeMillis();

    public StyleSheetRefresher(final Scene scene) {
        super("StyleSheetRefresher", 2000);
        this.scene = scene;
        start();
    }

    /**
     * Stylesheets can not be refreshed in they are not outside
     * 
     * @param scene
     * @return
     */
    public static boolean canStylesBeRefreshed(final Scene scene) {
        final List sheets = scene.getStylesheets();
        for (final String sheet : sheets) {
            if (sheet.startsWith("file"))
                return true;
        }
        return false;
    }

    @Override public void work() {
        /**
         * Do not allow previous modifications to force a refresh
         */

        try {
            final List sheets = scene.getStylesheets();
            boolean needsRefresh = false;
            for (final String sheet : sheets) {
                if (sheet.startsWith("file")) {
                    final File file = new File(new URL(sheet).getFile());
                    if (file.lastModified() > lastModified) {
                        lastModified = file.lastModified();
                        needsRefresh = true;
                    }
                }
            }
            if (needsRefresh) {
                final List styleSheets = new ArrayList<>(sheets);
                Platform.runLater(new Runnable() {

                    @Override public void run() {
                        scene.getStylesheets().clear();
                        scene.getStylesheets().addAll(styleSheets);
                    }

                });
            }
        } catch (final Exception e) {
            ExceptionLogger.submitException(e);
        }
    }

    public Scene getScene() {
        return scene;
    }
}