Fix dangling wires when remove input-connected part.

app/src/main/java/com/codigoparallevar/minicards/CanvasView.java

@@ -249,13 +249,14 @@ class CanvasView extends View implements PartGrid {
                 }
                 else if (motionMode == MotionMode.Type.LongTouch) {
                     if (selectedPart != null) {
+                        selectedPart.getMoveable().drop(x, y);
+
                         if (inDropZone(x, y)) {
                             Log.d("Canvas", "Deleting element" + selectedPart);
                             parts.remove(selectedPart);
+                            selectedPart.unlink();
                         }
-                        else {
-                            selectedPart.getMoveable().drop(x, y);
-                        }
+                        invalidate();
                     }
                 }
 

app/src/main/java/com/codigoparallevar/minicards/parts/buttons/RoundButton.java

@@ -240,4 +240,12 @@ public class RoundButton implements Part {
     public Moveable getMoveable() {
         return this;
     }
+
+
+    @Override
+    public void unlink() {
+        for (InputConnector input : getSignalInputConnectors()) {
+            input.unlink();
+        }
+    }
 }

app/src/main/java/com/codigoparallevar/minicards/parts/samples/ColorBox.java

@@ -6,6 +6,7 @@ import android.graphics.Paint;
 import android.graphics.Rect;
 import android.util.Log;
 
+import com.codigoparallevar.minicards.types.Wire;
 import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
 import com.codigoparallevar.minicards.types.Moveable;
 import com.codigoparallevar.minicards.types.connectors.input.SignalInputConnector;
@@ -209,6 +210,13 @@ public class ColorBox implements Part {
         return this;
     }
 
+    @Override
+    public void unlink() {
+        for (InputConnector input : getSignalInputConnectors()) {
+            input.unlink();
+        }
+    }
+
     public int getInputConnectorCenterX() {
         return getLeft();
     }

app/src/main/java/com/codigoparallevar/minicards/parts/samples/Placeholder.java

@@ -165,4 +165,11 @@ public class Placeholder implements Part {
     public Moveable getMoveable() {
         return this;
     }
+
+    @Override
+    public void unlink() {
+        for (InputConnector input : getSignalInputConnectors()) {
+            input.unlink();
+        }
+    }
 }

app/src/main/java/com/codigoparallevar/minicards/types/Dropper.java

@@ -2,4 +2,5 @@ package com.codigoparallevar.minicards.types;
 
 public interface Dropper<T extends Wire> {
     void drop(T wire);
+    void unlinkWire(T wire);
 }

app/src/main/java/com/codigoparallevar/minicards/types/RoundInputConnector.java

@@ -35,6 +35,13 @@ public class RoundInputConnector implements SignalInputConnector {
         return new Wire(this, _xposition, _yposition);
     }
 
+    @Override
+    public void unlink() {
+        for (Wire wire : _attachments) {
+            wire.unlink();
+        }
+    }
+
     @Override
     public void updatePosition(int x, int y) {
         _xposition = x;
@@ -80,4 +87,9 @@ public class RoundInputConnector implements SignalInputConnector {
     public void drop(Wire wire) {
         Log.d("InputConnector", "Dropped wire " + wire);
     }
+
+    @Override
+    public void unlinkWire(Wire wire) {
+        _attachments.remove(wire);
+    }
 }

app/src/main/java/com/codigoparallevar/minicards/types/RoundOutputConnector.java

@@ -49,6 +49,9 @@ public class RoundOutputConnector implements Drawable, SignalOutputConnector {
         return _currentWire;
     }
 
+    @Override
+    public void unlink() {}
+
     private void startWire() {
         _currentWire = new SignalWire(this, _centerX, _centerY);
     }
@@ -85,6 +88,11 @@ public class RoundOutputConnector implements Drawable, SignalOutputConnector {
         }
     }
 
+    @Override
+    public void unlinkWire(SignalWire wire) {
+        _wires.remove(wire);
+    }
+
     @Override
     public void drawWires(Canvas canvas, boolean devMode) {
         for (SignalWire wire : _wires) {

app/src/main/java/com/codigoparallevar/minicards/types/Selectable.java

@@ -3,4 +3,5 @@ package com.codigoparallevar.minicards.types;
 public interface Selectable {
     boolean containsPoint(int x, int y);
     Moveable getMoveable();
+    void unlink();
 }

app/src/main/java/com/codigoparallevar/minicards/types/Wire.java

@@ -81,4 +81,9 @@ public class Wire<T extends WireDataType, InputConnectorType extends InputConnec
     public InputConnector getAttachedTo() {
         return _attachedTo;
     }
+
+    public void unlink() {
+        _attachedTo = null;
+        _dropper.unlinkWire(this);
+    }
 }