added a delay

src/main/java/de/neemann/digital/core/wiring/Delay.java

@@ -0,0 +1,57 @@
+package de.neemann.digital.core.wiring;
+
+import de.neemann.digital.core.BitsException;
+import de.neemann.digital.core.Node;
+import de.neemann.digital.core.NodeException;
+import de.neemann.digital.core.ObservableValue;
+import de.neemann.digital.core.part.AttributeKey;
+import de.neemann.digital.core.part.Part;
+import de.neemann.digital.core.part.PartAttributes;
+import de.neemann.digital.core.part.PartTypeDescription;
+
+/**
+ * @author hneemann
+ */
+public class Delay extends Node implements Part {
+
+    public static final PartTypeDescription DESCRIPTION = new PartTypeDescription(Delay.class, "in");
+
+    private final ObservableValue output;
+    private final int bits;
+    private ObservableValue input;
+    private long value;
+
+    public Delay(PartAttributes attributes) {
+        bits = attributes.get(AttributeKey.Bits);
+        output = new ObservableValue("out", bits);
+    }
+
+    @Override
+    public void readInputs() throws NodeException {
+        value = input.getValue();
+    }
+
+    @Override
+    public void writeOutputs() throws NodeException {
+        output.setValue(value);
+    }
+
+    public ObservableValue getOutput() {
+        return output;
+    }
+
+    @Override
+    public void setInputs(ObservableValue... inputs) throws NodeException {
+        input = inputs[0];
+        input.addListener(this);
+
+        if (input.getBits() != bits)
+            throw new BitsException("wrongBitCountInDelay", input, output);
+    }
+
+    @Override
+    public ObservableValue[] getOutputs() {
+        return new ObservableValue[]{output};
+    }
+
+}

src/main/java/de/neemann/digital/gui/Main.java

@@ -41,7 +41,7 @@ public class Main extends JFrame implements ClosingWindowListener.ConfirmSave {
 
     public Main() {
         super("Digital");
-        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
 
 
         Circuit cr = new Circuit();
@@ -230,6 +230,7 @@ public class Main extends JFrame implements ClosingWindowListener.ConfirmSave {
         try (FileWriter out = new FileWriter(filename)) {
             xStream.marshal(circuitComponent.getCircuit(), new PrettyPrintWriter(out));
             setFilename(filename);
+            circuitComponent.getCircuit().saved();
         } catch (IOException e) {
             new ErrorMessage("error writing a file").addCause(e).show();
         }

src/main/java/de/neemann/digital/gui/draw/library/PartLibrary.java

@@ -13,6 +13,7 @@ import de.neemann.digital.core.io.In;
 import de.neemann.digital.core.io.LED;
 import de.neemann.digital.core.io.Out;
 import de.neemann.digital.core.part.PartTypeDescription;
+import de.neemann.digital.core.wiring.Delay;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -34,6 +35,7 @@ public class PartLibrary implements Iterable<PartLibrary.PartContainer> {
         add(XOr.DESCRIPTION, "Logic");
         add(XNOr.DESCRIPTION, "Logic");
         add(Not.DESCRIPTION, "Logic");
+        add(Delay.DESCRIPTION, "Logic");
 
         add(In.DESCRIPTION, "IO");
         add(Out.DESCRIPTION, "IO");

src/main/java/de/neemann/digital/gui/draw/parts/Circuit.java

@@ -116,4 +116,8 @@ public class Circuit implements Drawable {
     public boolean isModified() {
         return modified;
     }
+
+    public void saved() {
+        modified = false;
+    }
 }

src/main/java/de/neemann/digital/gui/draw/shapes/OutputShape.java

@@ -60,7 +60,7 @@ public class OutputShape implements Shape {
         Vector center = new Vector(2 + SIZE, 0);
         graphic.drawCircle(center.sub(RAD), center.add(RAD), style);
         graphic.drawCircle(center.sub(RADL), center.add(RADL), Style.NORMAL);
-        Vector textPos = new Vector(SIZE * 3, 0);
+        Vector textPos = new Vector(SIZE * 2 + 3, 0);
         graphic.drawText(textPos, textPos.add(1, 0), label, Orientation.LEFTCENTER, Style.NORMAL);
     }
 }

src/main/java/de/neemann/digital/gui/draw/shapes/ShapeFactory.java

@@ -12,6 +12,7 @@ import de.neemann.digital.core.io.Out;
 import de.neemann.digital.core.part.AttributeKey;
 import de.neemann.digital.core.part.PartAttributes;
 import de.neemann.digital.core.part.PartTypeDescription;
+import de.neemann.digital.core.wiring.Delay;
 import de.neemann.digital.gui.draw.library.PartLibrary;
 
 import java.util.HashMap;
@@ -30,6 +31,7 @@ public final class ShapeFactory {
         map.put(NAnd.DESCRIPTION.getName(), new CreatorSimple("&", NAnd.DESCRIPTION, true));
         map.put(NOr.DESCRIPTION.getName(), new CreatorSimple("\u22651", NOr.DESCRIPTION, true));
         map.put(Not.DESCRIPTION.getName(), new CreatorSimple("", Not.DESCRIPTION, true));
+        map.put(Delay.DESCRIPTION.getName(), new CreatorSimple("", Delay.DESCRIPTION, false));
 
         map.put(XOr.DESCRIPTION.getName(), new CreatorSimple("=1", XOr.DESCRIPTION, false));
         map.put(XNOr.DESCRIPTION.getName(), new CreatorSimple("=1", XNOr.DESCRIPTION, true));