a rough fsm editor is working

src/main/java/de/neemann/digital/draw/graphics/VectorFloat.java

@@ -146,4 +146,13 @@ public class VectorFloat implements VectorInterface {
     public VectorFloat toFloat() {
         return this;
     }
+
+    /**
+     * Creates vector which is orthogonal to this one.
+     *
+     * @return the orthogonal vector
+     */
+    public VectorFloat getOrthogonal() {
+        return new VectorFloat(y, -x);
+    }
 }

src/main/java/de/neemann/digital/fsm/FSM.java

@@ -5,6 +5,9 @@
  */
 package de.neemann.digital.fsm;
 
+import com.thoughtworks.xstream.XStream;
+import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
+import com.thoughtworks.xstream.io.xml.StaxDriver;
 import de.neemann.digital.analyse.TruthTable;
 import de.neemann.digital.analyse.expression.ExpressionException;
 import de.neemann.digital.draw.graphics.Graphic;
@@ -12,6 +15,7 @@ import de.neemann.digital.draw.graphics.Vector;
 import de.neemann.digital.draw.graphics.VectorFloat;
 import de.neemann.digital.lang.Lang;
 
+import java.io.*;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -23,6 +27,89 @@ public class FSM {
     private ArrayList<State> states;
     private ArrayList<Transition> transitions;
     private transient boolean initChecked;
+    private transient boolean modified;
+    private transient ModifiedListener modifiedListener;
+
+    /**
+     * Creates a proper configured XStream instance
+     *
+     * @return the XStream instance
+     */
+    public static XStream getxStream() {
+        XStream xStream = new XStream(new StaxDriver());
+        xStream.alias("fsm", FSM.class);
+        xStream.alias("state", State.class);
+        xStream.alias("transition", Transition.class);
+        xStream.alias("vector", Vector.class);
+        xStream.aliasAttribute(Vector.class, "x", "x");
+        xStream.aliasAttribute(Vector.class, "y", "y");
+        xStream.alias("vectorf", VectorFloat.class);
+        xStream.aliasAttribute(VectorFloat.class, "x", "x");
+        xStream.aliasAttribute(VectorFloat.class, "y", "y");
+        return xStream;
+    }
+
+    /**
+     * Creates a new circuit instance from a stored file
+     *
+     * @param filename filename
+     * @return the fsm
+     * @throws IOException IOException
+     */
+    public static FSM loadFSM(File filename) throws IOException {
+        return loadFSM(new FileInputStream(filename));
+    }
+
+    /**
+     * Creates a new fsm instance from a stored file
+     *
+     * @param in the input stream
+     * @return the fsm
+     * @throws IOException IOException
+     */
+    public static FSM loadFSM(InputStream in) throws IOException {
+        try {
+            XStream xStream = getxStream();
+            final FSM fsm = (FSM) xStream.fromXML(in);
+            for (Transition t : fsm.transitions)
+                t.setFSM(fsm);
+            for (State s : fsm.states)
+                s.setFSM(fsm);
+            fsm.modified = false;
+            return fsm;
+        } catch (RuntimeException e) {
+            throw new IOException(Lang.get("err_invalidFileFormat"), e);
+        } finally {
+            in.close();
+        }
+    }
+
+    /**
+     * Stores the fsm in the given file
+     *
+     * @param filename filename
+     * @throws IOException IOException
+     */
+    public void save(File filename) throws IOException {
+        save(new FileOutputStream(filename));
+    }
+
+    /**
+     * Stores the circuit in the given file
+     *
+     * @param out the writer
+     * @throws IOException IOException
+     */
+    public void save(OutputStream out) throws IOException {
+        try (Writer w = new OutputStreamWriter(out, "utf-8")) {
+            XStream xStream = getxStream();
+            w.write("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
+            xStream.marshal(this, new PrettyPrintWriter(w));
+            modified = false;
+            if (modifiedListener != null)
+                modifiedListener.modifiedChanged(modified);
+        }
+    }
 
     /**
      * Creates a new FSM containing the given states
@@ -45,6 +132,7 @@ public class FSM {
     public FSM add(State state) {
         if (state.getNumber() < 0)
             state.setNumber(states.size());
+        state.setFSM(this);
         states.add(state);
         return this;
     }
@@ -57,6 +145,7 @@ public class FSM {
      */
     public FSM add(Transition transition) {
         transitions.add(transition);
+        transition.setFSM(this);
         return this;
     }
 
@@ -96,9 +185,9 @@ public class FSM {
      */
     public FSM transition(State from, State to, String condition) {
         if (!states.contains(from))
-            states.add(from);
+            add(from);
         if (!states.contains(to))
-            states.add(to);
+            add(to);
         return add(new Transition(from, to, condition));
     }
 
@@ -190,8 +279,10 @@ public class FSM {
 
     /**
      * Orders all states in a big circle
+     *
+     * @return this for chained calls
      */
-    public void circle() {
+    public FSM circle() {
         double delta = 2 * Math.PI / states.size();
         double rad = 0;
         for (State s : states)
@@ -207,6 +298,8 @@ public class FSM {
 
         for (Transition t : transitions)
             t.initPos();
+
+        return this;
     }
 
     /**
@@ -260,6 +353,7 @@ public class FSM {
      */
     public void remove(Transition transition) {
         transitions.remove(transition);
+        wasModified();
     }
 
     /**
@@ -270,5 +364,43 @@ public class FSM {
     public void remove(State state) {
         states.remove(state);
         transitions.removeIf(t -> t.getStartState() == state || t.getTargetState() == state);
+        wasModified();
+    }
+
+    /**
+     * Marks the fsm as modified
+     */
+    void wasModified() {
+        modified = true;
+        if (modifiedListener != null)
+            modifiedListener.modifiedChanged(modified);
+    }
+
+    /**
+     * Sets a modified listener
+     *
+     * @param modifiedListener the listener called if fsm was modified
+     */
+    public void setModifiedListener(ModifiedListener modifiedListener) {
+        this.modifiedListener = modifiedListener;
+    }
+
+    /**
+     * @return true if fsm has changed
+     */
+    public boolean hasChanged() {
+        return modified;
+    }
+
+    /**
+     * a modified listener
+     */
+    public interface ModifiedListener {
+        /**
+         * called if fsm was modified
+         *
+         * @param wasModified true is fsm is modified
+         */
+        void modifiedChanged(boolean wasModified);
     }
 }

src/main/java/de/neemann/digital/fsm/Movable.java

@@ -12,8 +12,9 @@ import de.neemann.digital.draw.graphics.VectorFloat;
  */
 public class Movable {
     private VectorFloat position;
-    private VectorFloat speed;
+    private transient VectorFloat speed;
-    private VectorFloat force;
+    private transient VectorFloat force;
+    private transient FSM fsm;
 
     /**
      * Creates a new instance
@@ -30,7 +31,15 @@ public class Movable {
      * @param position the position
      */
     public void setPos(VectorFloat position) {
+        if (!this.position.equals(position)) {
             this.position = position;
+            wasModified();
+        }
+    }
+
+    void wasModified() {
+        if (fsm != null)
+            fsm.wasModified();
     }
 
     /**
@@ -39,6 +48,9 @@ public class Movable {
      * @param df the force to add
      */
     public void addToForce(VectorFloat df) {
+        if (force == null)
+            force = df;
+        else
             force = force.add(df);
     }
 
@@ -92,6 +104,8 @@ public class Movable {
      * @return the force
      */
     public VectorFloat getForce() {
+        if (force == null)
+            resetForce();
         return force;
     }
 
@@ -115,9 +129,19 @@ public class Movable {
      * @param dt the time step
      */
     public void move(int dt) {
+        if (speed == null)
+            speed = force.mul(dt / 200f);
+        else
             speed = speed.add(force.mul(dt / 200f));
         setPos(position.add(speed.mul(dt / 1000f)));
         speed = speed.mul(0.7f);
     }
 
+    void setFSM(FSM fsm) {
+        this.fsm = fsm;
+    }
+
+    FSM getFsm() {
+        return fsm;
+    }
 }

src/main/java/de/neemann/digital/fsm/State.java

@@ -47,8 +47,11 @@ public class State extends Movable {
      * @return this for chained calls
      */
     public State setValues(String values) {
+        if (!this.values.equals(values)) {
             this.values = values;
             valueMap = null;
+            wasModified();
+        }
         return this;
     }
 
@@ -100,7 +103,10 @@ public class State extends Movable {
      * @param name the name to set
      */
     public void setName(String name) {
+        if (!this.name.equals(name)) {
             this.name = name;
+            wasModified();
+        }
     }
 
     /**
@@ -172,7 +178,10 @@ public class State extends Movable {
      * @return this for chained calls
      */
     public State setNumber(int number) {
+        if (this.number!=number) {
             this.number = number;
+            wasModified();
+        }
         return this;
     }
 

src/main/java/de/neemann/digital/fsm/Transition.java

@@ -93,7 +93,7 @@ public class Transition extends Movable {
         if (fromState != toState) {
             VectorFloat dist = fromState.getPos().sub(toState.getPos());
             VectorFloat p = position.sub(fromState.getPos());
-            VectorFloat n = new VectorFloat(dist.getYFloat(), -dist.getXFloat()).norm();
+            VectorFloat n = dist.getOrthogonal().norm();
             float l = p.mul(n);
             super.setPos(fromState.getPos().sub(dist.mul(0.5f)).add(n.mul(l)));
         } else
@@ -132,7 +132,7 @@ public class Transition extends Movable {
         gr.drawPolygon(p, arrowStyle);
 
         // arrow
-        VectorFloat lot = new VectorFloat(difTo.getYFloat(), -difTo.getXFloat()).mul(0.5f);
+        VectorFloat lot = difTo.getOrthogonal().mul(0.5f);
         gr.drawPolygon(new Polygon(false)
                 .add(end.add(difTo.add(lot).mul(0.2f)))
                 .add(arrowTip)
@@ -156,9 +156,12 @@ public class Transition extends Movable {
      * @param condition the condition
      */
     public void setCondition(String condition) {
+        if (!this.condition.equals(condition)) {
             this.condition = condition;
+            wasModified();
             conditionExpression = null;
         }
+    }
 
     /**
      * @return returns the condition

src/main/java/de/neemann/digital/fsm/gui/FSMComponent.java

@@ -8,10 +8,8 @@ package de.neemann.digital.fsm.gui;
 import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.core.element.Key;
 import de.neemann.digital.core.element.Keys;
-import de.neemann.digital.draw.graphics.GraphicMinMax;
+import de.neemann.digital.draw.graphics.*;
-import de.neemann.digital.draw.graphics.GraphicSwing;
+import de.neemann.digital.draw.graphics.Polygon;
-import de.neemann.digital.draw.graphics.Style;
-import de.neemann.digital.draw.graphics.Vector;
 import de.neemann.digital.fsm.FSM;
 import de.neemann.digital.fsm.Movable;
 import de.neemann.digital.fsm.State;
@@ -50,14 +48,8 @@ public class FSMComponent extends JComponent {
 
     /**
      * Creates a new component
-     *
-     * @param fsm the fsm to visualize
      */
-    public FSMComponent(FSM fsm) {
+    public FSMComponent() {
-        this.fsm = fsm;
-
-        fsm.circle();
-
         addMouseWheelListener(e -> {
             Vector pos = getPosVector(e);
             double f = Math.pow(0.9, e.getWheelRotation());
@@ -69,6 +61,7 @@ public class FSMComponent extends JComponent {
         });
 
         MouseAdapter mouseListener = new MouseAdapter() {
+            private boolean screenDrag;
             private Vector newTransitionStartPos;
             private Vector delta;
             private Vector pos;
@@ -77,6 +70,7 @@ public class FSMComponent extends JComponent {
             public void mousePressed(MouseEvent e) {
                 pos = new Vector(e.getX(), e.getY());
                 final Vector posVector = getPosVector(e);
+                screenDrag=false;
                 if (mouse.isPrimaryClick(e)) {
                     elementMoved = fsm.getMovable(posVector);
                     if (elementMoved != null)
@@ -88,13 +82,16 @@ public class FSMComponent extends JComponent {
                         newTransitionFromState = (State) st;
                         repaint();
                     }
+                    screenDrag=true;
                 }
             }
 
             @Override
             public void mouseReleased(MouseEvent mouseEvent) {
-                if (elementMoved instanceof State)
+                if (elementMoved instanceof State) {
                     ((State) elementMoved).toRaster();
+                    repaint();
+                }
                 elementMoved = null;
                 if (newTransitionFromState != null) {
                     final Vector posVector = getPosVector(mouseEvent);
@@ -130,7 +127,7 @@ public class FSMComponent extends JComponent {
             @Override
             public void mouseDragged(MouseEvent e) {
                 lastMousePos = getPosVector(e);
-                if (elementMoved == null && newTransitionFromState == null) {
+                if (elementMoved == null && newTransitionFromState == null && screenDrag) {
                     Vector newPos = new Vector(e.getX(), e.getY());
                     Vector delta = newPos.sub(pos);
                     double s = transform.getScaleX();
@@ -139,8 +136,10 @@ public class FSMComponent extends JComponent {
                     isManualScale = true;
                     repaint();
                 }
-                if (elementMoved != null)
+                if (elementMoved != null) {
                     elementMoved.setPos(getPosVector(e).sub(delta).toFloat());
+                    repaint();
+                }
                 if (newTransitionFromState != null)
                     repaint();
             }
@@ -177,6 +176,7 @@ public class FSMComponent extends JComponent {
 
     private void createNewState(Vector posVector, Point point) {
         ElementAttributes attr = new ElementAttributes();
+        attr.set(KEY_NUMBER, fsm.getStates().size());
         SwingUtilities.convertPointToScreen(point, this);
         AttributeDialog ad = new AttributeDialog(SwingUtilities.getWindowAncestor(this), point, attr, Keys.LABEL, KEY_NUMBER, KEY_VALUES);
         ad.setTitle(Lang.get("msg_fsmNewState"));
@@ -239,6 +239,7 @@ public class FSMComponent extends JComponent {
      * Fits the FSM to the window
      */
     public void fitFSM() {
+        if (fsm != null) {
             GraphicMinMax gr = new GraphicMinMax();
             fsm.drawTo(gr);
 
@@ -266,6 +267,21 @@ public class FSMComponent extends JComponent {
                 repaint();
             }
         }
+    }
+
+    /**
+     * scales the fsm
+     *
+     * @param f factor to scale
+     */
+    public void scaleCircuit(double f) {
+        Vector dif = getPosVector(getWidth() / 2, getHeight() / 2);
+        transform.translate(dif.x, dif.y);
+        transform.scale(f, f);
+        transform.translate(-dif.x, -dif.y);
+        isManualScale = true;
+        repaint();
+    }
 
     /**
      * @return the element picked by the mouse
@@ -290,7 +306,25 @@ public class FSMComponent extends JComponent {
         GraphicSwing gr = new GraphicSwing(gr2, 1);
         fsm.drawTo(gr);
 
-        if (newTransitionFromState != null)
+        if (newTransitionFromState != null) {
-            gr.drawLine(newTransitionFromState.getPos(), lastMousePos, Style.NORMAL);
+            VectorFloat d = lastMousePos.sub(newTransitionFromState.getPos()).norm().mul(16f);
+            VectorFloat a = d.getOrthogonal().norm().mul(8f);
+            gr.drawPolygon(new Polygon(false)
+                    .add(lastMousePos.sub(d).add(a))
+                    .add(lastMousePos)
+                    .add(lastMousePos.sub(d).sub(a)), Style.NORMAL);
+            gr.drawLine(newTransitionFromState.getPos(), lastMousePos.sub(d.mul(0.2f)), Style.NORMAL);
+        }
+    }
+
+    /**
+     * Sets the fsm to show
+     *
+     * @param fsm the fsm to show
+     */
+    public void setFSM(FSM fsm) {
+        this.fsm = fsm;
+        fitFSM();
+        repaint();
     }
 }

src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java

@@ -9,26 +9,41 @@ import de.neemann.digital.draw.library.ElementLibrary;
 import de.neemann.digital.draw.shapes.ShapeFactory;
 import de.neemann.digital.fsm.FSM;
 import de.neemann.digital.fsm.FSMDemos;
+import de.neemann.digital.gui.SaveAsHelper;
 import de.neemann.digital.gui.components.table.TableDialog;
 import de.neemann.digital.lang.Lang;
-import de.neemann.gui.ErrorMessage;
+import de.neemann.gui.*;
-import de.neemann.gui.ToolTipAction;
 
 import javax.swing.*;
+import javax.swing.filechooser.FileNameExtensionFilter;
 import java.awt.*;
 import java.awt.event.ActionEvent;
+import java.awt.event.KeyEvent;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
+import java.io.File;
+import java.io.IOException;
 
 /**
  * The dialog to show the FSM
  */
-public class FSMFrame extends JFrame {
+public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSave, FSM.ModifiedListener {
+    private static final Icon ICON_NEW = IconCreator.create("document-new.png");
+    private static final Icon ICON_OPEN = IconCreator.create("document-open.png");
+    private static final Icon ICON_SAVE = IconCreator.create("document-save.png");
+    private static final Icon ICON_SAVE_AS = IconCreator.create("document-save-as.png");
+    private static final Icon ICON_EXPAND = IconCreator.create("View-zoom-fit.png");
+    private static final Icon ICON_ZOOM_IN = IconCreator.create("View-zoom-in.png");
+    private static final Icon ICON_ZOOM_OUT = IconCreator.create("View-zoom-out.png");
 
-    private final FSM fsm;
+    private FSM fsm;
     private final FSMComponent fsmComponent;
     private final Timer timer;
+    private final JComboBox<String> moveControl;
     private boolean moveStates = false;
+    private ToolTipAction save;
+    private File filename;
+    private boolean lastModified;
 
     /**
      * Use only for tests!
@@ -45,7 +60,6 @@ public class FSMFrame extends JFrame {
         return library;
     }
 
-
     /**
      * Creates a new instance
      *
@@ -56,12 +70,12 @@ public class FSMFrame extends JFrame {
     public FSMFrame(JFrame parent, FSM givenFsm, ElementLibrary library) {
         super(Lang.get("fsm_title"));
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
-        if (givenFsm == null)
+        if (givenFsm == null) {
             givenFsm = FSMDemos.rotDecoder();
+            givenFsm.circle();
+        }
 
-        this.fsm = givenFsm;
+        fsmComponent = new FSMComponent();
-
-        fsmComponent = new FSMComponent(fsm);
         getContentPane().add(fsmComponent, BorderLayout.CENTER);
 
         timer = new Timer(100, new AbstractAction() {
@@ -73,8 +87,6 @@ public class FSMFrame extends JFrame {
             }
         });
 
-        timer.start();
-
         addWindowListener(new WindowAdapter() {
             @Override
             public void windowClosed(WindowEvent windowEvent) {
@@ -83,6 +95,12 @@ public class FSMFrame extends JFrame {
         });
 
         JMenuBar bar = new JMenuBar();
+        JToolBar toolBar = new JToolBar();
+
+        createFileMenu(bar, toolBar);
+        toolBar.addSeparator();
+        createViewMenu(bar, toolBar);
+        toolBar.addSeparator();
 
         JMenu create = new JMenu(Lang.get("menu_fsm_create"));
         bar.add(create);
@@ -97,44 +115,222 @@ public class FSMFrame extends JFrame {
             }
         }.createJMenuItem());
 
-        JToolBar toolBar = new JToolBar();
 
-        final JCheckBox moveCheck = new JCheckBox(Lang.get("fsm_move"));
+        moveControl = new JComboBox<>(new String[]{
-        moveCheck.addActionListener(new AbstractAction() {
+                Lang.get("fsm_noMove"), Lang.get("fsm_moveTrans"), Lang.get("fsm_moveStates")});
+        moveControl.setSelectedIndex(0);
+        moveControl.addActionListener(new AbstractAction() {
             @Override
             public void actionPerformed(ActionEvent actionEvent) {
-                moveStates = moveCheck.isSelected();
+                switch (moveControl.getSelectedIndex()) {
-                if (!moveStates) {
+                    case 0:
+                        timer.stop();
                         fsm.toRaster();
-                    repaint();
+                        fsmComponent.repaint();
+                        break;
+                    case 1:
+                        moveStates = false;
+                        timer.start();
+                        break;
+                    case 2:
+                        moveStates = true;
+                        timer.start();
+                        break;
                 }
             }
         });
-        moveCheck.setSelected(moveStates);
+        JPanel movePanel = new JPanel(new BorderLayout());
-        toolBar.add(moveCheck);
+        movePanel.add(moveControl, BorderLayout.WEST);
+        toolBar.add(movePanel);
         getContentPane().add(toolBar, BorderLayout.PAGE_START);
 
-
         setJMenuBar(bar);
 
         pack();
-        fsmComponent.fitFSM();
+        setFSM(givenFsm);
+
         setLocationRelativeTo(parent);
     }
 
+    private void createFileMenu(JMenuBar bar, JToolBar toolBar) {
+        ToolTipAction newFile = new ToolTipAction(Lang.get("menu_new"), ICON_NEW) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                if (ClosingWindowListener.checkForSave(FSMFrame.this, FSMFrame.this)) {
+                    setFSM(new FSM());
+                    setFilename(null);
+                }
+            }
+        }.setAcceleratorCTRLplus('N').setToolTip(Lang.get("menu_new_tt"));
+
+        ToolTipAction open = new ToolTipAction(Lang.get("menu_open"), ICON_OPEN) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                if (ClosingWindowListener.checkForSave(FSMFrame.this, FSMFrame.this)) {
+                    JFileChooser fc = getJFileChooser(filename);
+                    if (fc.showOpenDialog(FSMFrame.this) == JFileChooser.APPROVE_OPTION) {
+                        loadFile(fc.getSelectedFile());
+                    }
+                }
+            }
+        }.setAcceleratorCTRLplus('O');
+
+//        JMenu openRecent = new JMenu(Lang.get("menu_openRecent"));
+//        JMenu openRecentNewWindow = new JMenu(Lang.get("menu_openRecentNewWindow"));
+//        fileHistory.setMenu(openRecent, openRecentNewWindow);
+
+        ToolTipAction saveAs = new ToolTipAction(Lang.get("menu_saveAs"), ICON_SAVE_AS) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                JFileChooser fc = getJFileChooser(filename);
+                final SaveAsHelper saveAsHelper = new SaveAsHelper(FSMFrame.this, fc, "fsm");
+                saveAsHelper.checkOverwrite(file -> saveFile(file));
+            }
+        };
+
+        save = new ToolTipAction(Lang.get("menu_save"), ICON_SAVE) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                if (filename == null)
+                    saveAs.actionPerformed(e);
+                else
+                    saveFile(filename);
+            }
+        }.setAcceleratorCTRLplus('S').setEnabledChain(false);
+
+        JMenu file = new JMenu(Lang.get("menu_file"));
+        bar.add(file);
+        file.add(newFile.createJMenuItem());
+        file.add(open.createJMenuItem());
+        file.add(save.createJMenuItem());
+        file.add(saveAs.createJMenuItem());
+
+        toolBar.add(newFile.createJButtonNoText());
+        toolBar.add(open.createJButtonNoText());
+        toolBar.add(save.createJButtonNoText());
+    }
+
+    private void setFSM(FSM fsm) {
+        this.fsm = fsm;
+        fsmComponent.setFSM(fsm);
+        fsm.setModifiedListener(this);
+    }
+
+    private static JFileChooser getJFileChooser(File filename) {
+        File folder = null;
+        if (filename != null)
+            folder = filename.getParentFile();
+
+        JFileChooser fileChooser = new MyFileChooser(folder);
+        fileChooser.setFileFilter(new FileNameExtensionFilter("FSM", "fsm"));
+        return fileChooser;
+    }
+
+    private void setFilename(File filename) {
+        String fsmTitle;
+        if (filename == null)
+            fsmTitle = Lang.get("fsm_title");
+        else
+            fsmTitle = filename.toString() + " - " + Lang.get("fsm_title");
+
+        if (fsm.hasChanged())
+            fsmTitle = "*" + fsmTitle;
+        setTitle(fsmTitle);
+
+        this.filename = filename;
+    }
+
+    @Override
+    public boolean isStateChanged() {
+        return fsm.hasChanged();
+    }
+
+    @Override
+    public void saveChanges() {
+        save.actionPerformed(null);
+    }
+
+    @Override
+    public void modifiedChanged(boolean modified) {
+        if (lastModified != modified) {
+            lastModified = modified;
+            setFilename(filename);
+            save.setEnabled(modified);
+        }
+    }
+
+    private void loadFile(File file) {
+        try {
+            moveControl.setSelectedIndex(0);
+            setFSM(FSM.loadFSM(file));
+            setFilename(file);
+        } catch (IOException e) {
+            new ErrorMessage(Lang.get("msg_fsm_errorLoadingFile")).addCause(e).show(this);
+        }
+    }
+
+    private void saveFile(File file) {
+        try {
+            fsm.save(file);
+            setFilename(file);
+            save.setEnabled(false);
+        } catch (IOException e) {
+            new ErrorMessage(Lang.get("msg_fsm_errorStoringFile")).addCause(e).show(this);
+        }
+    }
+
+    private void createViewMenu(JMenuBar menuBar, JToolBar toolBar) {
+        ToolTipAction maximize = new ToolTipAction(Lang.get("menu_maximize"), ICON_EXPAND) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                fsmComponent.fitFSM();
+            }
+        }.setAccelerator("F1");
+        ToolTipAction zoomIn = new ToolTipAction(Lang.get("menu_zoomIn"), ICON_ZOOM_IN) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                fsmComponent.scaleCircuit(1 / 0.9);
+            }
+        }.setAccelerator("control PLUS");
+        // enable [+] which is SHIFT+[=] on english keyboard layout
+        fsmComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_EQUALS, KeyEvent.CTRL_DOWN_MASK, false), zoomIn);
+        fsmComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ADD, KeyEvent.CTRL_DOWN_MASK, false), zoomIn);
+        fsmComponent.getActionMap().put(zoomIn, zoomIn);
+
+        ToolTipAction zoomOut = new ToolTipAction(Lang.get("menu_zoomOut"), ICON_ZOOM_OUT) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                fsmComponent.scaleCircuit(0.9);
+            }
+        }.setAccelerator("control MINUS");
+        // enable [+] which is SHIFT+[=] on english keyboard layout
+        fsmComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_SUBTRACT, KeyEvent.CTRL_DOWN_MASK, false), zoomOut);
+        fsmComponent.getActionMap().put(zoomOut, zoomOut);
+
+        toolBar.add(zoomIn.createJButtonNoText());
+        toolBar.add(zoomOut.createJButtonNoText());
+        toolBar.add(maximize.createJButtonNoText());
+
+        JMenu view = new JMenu(Lang.get("menu_view"));
+        menuBar.add(view);
+        view.add(maximize.createJMenuItem());
+        view.add(zoomOut.createJMenuItem());
+        view.add(zoomIn.createJMenuItem());
+    }
+
+
     /**
      * A simple test method
      *
      * @param args the programs arguments
      */
     public static void main(String[] args) {
-
         FSM fsm = FSMDemos.rotDecoder();
 
         ElementLibrary library = new ElementLibrary();
         new ShapeFactory(library);
 
-        new FSMFrame(null, fsm, library).setVisible(true);
+        new FSMFrame(null, fsm.circle(), library).setVisible(true);
+    }
 
 }
-}

src/main/resources/lang/lang_de.xml

@@ -1760,13 +1760,14 @@ Daher steht auch das Signal 'D_out' zur Verfügung, um in diesem Fall den Wert z
     <string name="fsm_title">Endlicher Automat</string>
     <string name="menu_fsm_create">Erzeugen</string>
     <string name="menu_fsm_create_table">Zustandsübergangstabelle</string>
-    <string name="fsm_move">Bewegen</string>
     <string name="err_notDeterministic_N">Der Automat ist nicht deterministisch: {0}</string>
     <string name="err_fsmNumberUsedTwice_N">Zustandsnummer {0} ist nicht eindeutig.</string>
     <string name="err_fsmNoInitialState">Es gibt keinen Initialzustand.</string>
     <string name="err_fsmState_N_notFound">Zustand ''{0}'' nicht gefunden!</string>
     <string name="err_fsmInvalidOutputAssignment_N">Falsche Zuweisung an einen Ausgang (''{0}'')!</string>
     <string name="err_fsmErrorInCondition_N">Fehler in Bedingung ''{0}''!</string>
+    <string name="msg_fsm_errorLoadingFile">Fehler beim Laden der Datei!</string>
+    <string name="msg_fsm_errorStoringFile">Fehler beim Speichern der Datei!</string>
     <string name="key_stateNum">Zustandsnummer</string>
     <string name="key_stateNum_tt">Die Nummer welche diesen Zustand representiert.</string>
     <string name="key_stateValues">Ausgänge</string>
@@ -1777,5 +1778,8 @@ Daher steht auch das Signal 'D_out' zur Verfügung, um in diesem Fall den Wert z
     <string name="key_transCond">Bedingung</string>
     <string name="key_transCond_tt">Ein boolscher Ausdruck.</string>
     <string name="msg_fsmNewState">Neuer Zustand</string>
+    <string name="fsm_noMove">keine Bewegung</string>
+    <string name="fsm_moveTrans">Übergänge</string>
+    <string name="fsm_moveStates">Übergänge+Zustände</string>
 
 </resources>

src/main/resources/lang/lang_en.xml

@@ -1740,13 +1740,14 @@ Therefore, the signal 'D_out' is also available to check the value in this case.
     <string name="fsm_title">Finite State Machine</string>
     <string name="menu_fsm_create">Create</string>
     <string name="menu_fsm_create_table">State Transition Table</string>
-    <string name="fsm_move">Move</string>
     <string name="err_notDeterministic_N">The FSM is not deterministic: {0}</string>
     <string name="err_fsmNumberUsedTwice_N">State Number {0} used twice.</string>
     <string name="err_fsmNoInitialState">There is no initial state (state number zero).</string>
     <string name="err_fsmState_N_notFound">State ''{0}'' not found!</string>
     <string name="err_fsmInvalidOutputAssignment_N">Wrong  assignment to output (''{0}'')!</string>
     <string name="err_fsmErrorInCondition_N">Error in condition ''{0}''!</string>
+    <string name="msg_fsm_errorLoadingFile">Error loading a file!</string>
+    <string name="msg_fsm_errorStoringFile">Error storing a file!</string>
     <string name="key_stateNum">State Number</string>
     <string name="key_stateNum_tt">The number which represents this state.</string>
     <string name="key_stateValues">Outputs</string>
@@ -1757,5 +1758,8 @@ Therefore, the signal 'D_out' is also available to check the value in this case.
     <string name="key_transCond">Condition</string>
     <string name="key_transCond_tt">A boolean expression.</string>
     <string name="msg_fsmNewState">New State</string>
+    <string name="fsm_noMove">no movement</string>
+    <string name="fsm_moveTrans">Transitions</string>
+    <string name="fsm_moveStates">Transitions+States</string>
 
 </resources>