source: trunk/src/org/expeditee/items/widgets/JSWidget.java@ 765

package org.expeditee.items.widgets;

import java.awt.BorderLayout;
import java.util.LinkedList;
import java.util.List;

import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.swing.JComponent;
import javax.swing.JPanel;

import org.expeditee.actions.Javascript2;
import org.expeditee.gui.DisplayIO;
import org.expeditee.items.Text;

/**
 * Class for extending Expeditee with widgets coded in Javascript
 * 
 * @author jts21
 *
 */
public class JSWidget extends DataFrameWidget {
        
        private static final Object global = Javascript2.eval("new Object()");
        
        // a method to run that will set up and return the root JComponent for this Widget
        private final String init;
        // a method to run to populate a List<String> with our state
        private final String save;
        // a method to run that will load state from a String[]
        private final String load;
        
        // we have our own script context since it needs to have some global variables which are specific to each widget
        private final ScriptEngine scriptEngine;
        private final Invocable invocable;
        // component created by running our constructor
        private final JComponent component;
        // container for our component
        private final JPanel container;
        
        private static Text getSauce() {
                Text source = new Text(DisplayIO.getCurrentFrame().getNextItemID(), "@iw: org.expeditee.items.widgets.JSWidget");
                source.setParent(DisplayIO.getCurrentFrame());
                return source;
        }
        
        private JSWidget(Text source, String init, String save, String load) throws Exception {
                super(source, new JPanel(new BorderLayout()), -1, 100, -1, -1, 100, -1);
                this.init = init;
                this.save = save;
                this.load = load;
                this.container = (JPanel) super._swingComponent;
                this.scriptEngine = Javascript2.scriptEngineManager.getEngineByMimeType("application/javascript");
                this.invocable = (Invocable) this.scriptEngine;
                this.scriptEngine.put("global", global);
                this.scriptEngine.put("invocable", this.invocable);
                this.scriptEngine.put("widget", this);
                this.scriptEngine.put("container", this.container);
        System.out.println(this.init);
        this.component = (JComponent) this.scriptEngine.eval("var init = " + this.init + "\ninit()");
        this.container.add(component);
        this.scriptEngine.put("component", this.component);
        }
        
        public JSWidget(Text source, String[] args) throws Exception {
                this(source, source.getData().get(0).replaceAll("\\\\n", "\n"),
                                source.getData().get(1).replaceAll("\\\\n", "\n"),
                                source.getData().get(2).replaceAll("\\\\n", "\n"));
                this.scriptEngine.eval("load = " + this.load);
                this.invocable.invokeFunction("load", (Object) args);
        }
        
        public JSWidget(String init, String save, String load) throws Exception {
                this(getSauce(), init, save, load);
        }
        
        @Override
        protected List<String> getData() {
                List<String> value = new LinkedList<String>();
                value.add(this.init.replaceAll("[\n\r]", "\\\\n"));
                value.add(this.save.replaceAll("[\n\r]", "\\\\n"));
                value.add(this.load.replaceAll("[\n\r]", "\\\\n"));
                return value;
        }

    @Override
        protected String[] getArgs() {
                try {
                        List<String> args = new LinkedList<String>();
                        this.scriptEngine.eval("save = " + this.save);
                        this.invocable.invokeFunction("save", (Object)args);
                        return args.toArray(new String[0]);
                } catch(NullPointerException e) {
                        // caused when a null list is returned
                        return null;
        } catch (Exception e) {
                e.printStackTrace();
                return null;
        }
        }
}