Adds a [T] shortcut to insert a tunnel.

Shortcuts [+] and [-] are able to modify constants.
See #380

src/main/java/de/neemann/digital/draw/elements/Circuit.java

@@ -515,8 +515,19 @@ public class Circuit implements Copyable<Circuit> {
      * @return the first element or null if there is no element at the given position
      */
     public VisualElement getElementAt(Vector pos) {
+        return getElementAt(pos, false);
+    }
+
+    /**
+     * Returns the element at the given position
+     *
+     * @param pos         the cursor position
+     * @param includeText if true the label text is included in matching
+     * @return the first element or null if there is no element at the given position
+     */
+    public VisualElement getElementAt(Vector pos, boolean includeText) {
         for (VisualElement element : visualElements)
-            if (element.matches(pos, false))
+            if (element.matches(pos, includeText))
                 return element;
         return null;
     }

src/main/java/de/neemann/digital/gui/components/CircuitComponent.java

@@ -5,11 +5,10 @@
  */
 package de.neemann.digital.gui.components;
 
-import de.neemann.digital.core.NodeException;
+import de.neemann.digital.core.*;
-import de.neemann.digital.core.ObservableValue;
 import de.neemann.digital.core.Observer;
-import de.neemann.digital.core.SyncAccess;
 import de.neemann.digital.core.element.*;
+import de.neemann.digital.core.io.Const;
 import de.neemann.digital.core.io.In;
 import de.neemann.digital.core.io.InValue;
 import de.neemann.digital.core.io.Out;
@@ -346,6 +345,18 @@ public class CircuitComponent extends JComponent implements ChangedListener, Lib
             }
         }.setAcceleratorCTRLplus('D').enableAcceleratorIn(this);
 
+        new ToolTipAction("insertTunnel") {
+            @Override
+            public void actionPerformed(ActionEvent actionEvent) {
+                if (activeMouseController == mouseNormal) {
+                    VisualElement tunnel =
+                            new VisualElement(Tunnel.DESCRIPTION.getName())
+                                    .setShapeFactory(shapeFactory);
+                    setPartToInsert(tunnel);
+                }
+            }
+        }.setAccelerator("T").enableAcceleratorIn(this);
+
         ToolTipAction plus = new PlusMinusAction(1).setAccelerator("PLUS").enableAcceleratorIn(this);
         getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ADD, 0), plus);
 
@@ -1288,8 +1299,12 @@ public class CircuitComponent extends JComponent implements ChangedListener, Lib
             mouseNormal.activate();
 
         VisualElement ve = null;
-        if (activeMouseController instanceof MouseControllerNormal)
+        if (activeMouseController instanceof MouseControllerNormal) {
-            ve = getCircuit().getElementAt(getPosVector(lastMousePos.x, lastMousePos.y));
+            Vector pos = getPosVector(lastMousePos.x, lastMousePos.y);
+            ve = getCircuit().getElementAt(pos);
+            if (ve == null)
+                ve = getCircuit().getElementAt(pos, true);
+        }
         return ve;
     }
 
@@ -1403,6 +1418,10 @@ public class CircuitComponent extends JComponent implements ChangedListener, Lib
                             int number = ve.getElementAttributes().get(Keys.INPUT_COUNT) + delta;
                             if (number >= Keys.INPUT_COUNT.getMin() && number <= Keys.INPUT_COUNT.getMax())
                                 modify(new ModifyAttribute<>(ve, Keys.INPUT_COUNT, number));
+                        } else if (ve.equalsDescription(Const.DESCRIPTION)) {
+                            long v = ve.getElementAttributes().get(Keys.VALUE) + delta;
+                            v &= Bits.mask(ve.getElementAttributes().getBits());
+                            modify(new ModifyAttribute<>(ve, Keys.VALUE, v));
                         }
                     } catch (ElementNotFoundException e1) {
                         // do nothing on error

src/test/resources/docu/static_de.xml

@@ -657,6 +657,7 @@
             <shortcut key="STRG-D">Aktuelle Auswahl duplizieren ohne die Zwischenablage zu verändern.</shortcut>
             <shortcut key="R">Rotieren der Elemente beim Einfügen</shortcut>
             <shortcut key="L">Zuletzt eingefügtes Element noch einmal einfügen</shortcut>
+            <shortcut key="T">Einfügen eines Tunnels</shortcut>
             <shortcut key="STRG-N">Neue Schaltung</shortcut>
             <shortcut key="STRG-O">Schaltung öffnen</shortcut>
             <shortcut key="STRG-S">Speichern der Schaltung</shortcut>
@@ -669,8 +670,12 @@
             <shortcut key="ESC">Abbrechen der aktuellen Aktion</shortcut>
             <shortcut key="Entfernen">Löschen der selektierten Elemente</shortcut>
             <shortcut key="Rückschritt">Löschen der selektierten Elemente</shortcut>
-            <shortcut key="+">Erhöht die Anzahl der Eingänge in dem Element, auf welches die Maus zeigt.</shortcut>
+            <shortcut key="+">Erhöht die Anzahl der Eingänge in dem Element, auf welches die Maus zeigt. Bei Konstanten
-            <shortcut key="-">Erniedrigt die Anzahl der Eingänge in dem Element, auf welches die Maus zeigt.</shortcut>
+                wird der Wert erhöht.
+            </shortcut>
+            <shortcut key="-">Erniedrigt die Anzahl der Eingänge in dem Element, auf welches die Maus zeigt. Bei
+                Konstanten wird der Wert verringert.
+            </shortcut>
             <shortcut key="STRG +">Vergrößern</shortcut>
             <shortcut key="STRG -">Verkleinern</shortcut>
             <shortcut key="F1">Einpassen</shortcut>

src/test/resources/docu/static_en.xml

@@ -595,6 +595,7 @@
             <shortcut key="CTRL-D">Duplicate the current selection without modifying the clipboard.</shortcut>
             <shortcut key="R">While inserting this rotates the components.</shortcut>
             <shortcut key="L">Inserts the last inserted component again.</shortcut>
+            <shortcut key="T">Inserts a new tunnel.</shortcut>
             <shortcut key="CTRL-N">New circuit.</shortcut>
             <shortcut key="CTRL-O">Open circuit.</shortcut>
             <shortcut key="CTRL-S">Save the circuit.</shortcut>
@@ -607,8 +608,12 @@
             <shortcut key="ESC">Abort the current action.</shortcut>
             <shortcut key="Del">Removes the selected components.</shortcut>
             <shortcut key="Backspace">Removes the selected components.</shortcut>
-            <shortcut key="+">Increases the number of inputs at the component the mouse points to.</shortcut>
+            <shortcut key="+">Increases the number of inputs at the component the mouse points to. If it is used with
-            <shortcut key="-">Decreases the number of inputs at the component the mouse points to.</shortcut>
+                constants, the value is increased.
+            </shortcut>
+            <shortcut key="-">Decreases the number of inputs at the component the mouse points to. If it is used with
+                constants, the value is decreased.
+            </shortcut>
             <shortcut key="CTRL +">Zoom In</shortcut>
             <shortcut key="CTRL -">Zoom Out</shortcut>
             <shortcut key="F1">Fit to size</shortcut>