Move entities with arrow keys

ugs-designer/src/main/java/com/willwinder/ugs/designer/gui/Drawing.java

@@ -75,6 +75,7 @@ public class Drawing extends JPanel implements ISnapToGridListener {
     private final transient Throttler refreshThrottler;
     private final transient Rectangle2D currentBounds = new Rectangle(0, 0, 8, 8);
     private double scale;
+    private double snapToGrid;
     private Point2D.Double position = new Point2D.Double();
     private Dimension oldMinimumSize;
     private transient DropHandler dropHandler;
@@ -323,10 +324,15 @@ public Point2D.Double getPosition() {
 
     @Override
     public void snapToGridUpdated(double aNewValue) {
+        this.snapToGrid = aNewValue;
         for (Entity ctrl : this.controlsRoot.getAllChildren()) {
             if (ctrl instanceof ISnapToGridListener iSnapToGridListener) {
                 iSnapToGridListener.snapToGridUpdated(aNewValue);
             }
         }
     }
+
+    public double getSnapToGrid() {
+        return snapToGrid;
+    }
 }

ugs-designer/src/main/java/com/willwinder/ugs/designer/gui/KeyboardListener.java

@@ -18,20 +18,27 @@ This file is part of Universal Gcode Sender (UGS).
  */
 package com.willwinder.ugs.designer.gui;
 
+import com.willwinder.ugs.designer.actions.MoveAction;
+import com.willwinder.ugs.designer.entities.Entity;
 import com.willwinder.ugs.designer.entities.EventType;
 import com.willwinder.ugs.designer.entities.controls.Control;
+import com.willwinder.ugs.designer.entities.selection.SelectionManager;
 import com.willwinder.ugs.designer.logic.Controller;
 
 import java.awt.*;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
+import java.awt.geom.Point2D;
+import java.util.List;
 import java.util.Optional;
 
 /**
  * @author Joacim Breiler
  */
 public class KeyboardListener implements KeyListener {
 
+    private static final double DEFAULT_MOVE_STEP = 1.0;
+
     private final Controller controller;
     private final MouseListener mouseListener;
 
@@ -54,10 +61,49 @@ public void keyTyped(KeyEvent keyEvent) {
 
     @Override
     public void keyPressed(KeyEvent keyEvent) {
+        if (moveSelection(keyEvent)) {
+            keyEvent.consume();
+            return;
+        }
         mouseListener.getHoveredControls().forEach(control -> control.onEvent(new KeyboardEntityEvent(control, EventType.KEY_PRESSED, keyEvent)));
         updateCursor();
     }
 
+    private boolean moveSelection(KeyEvent keyEvent) {
+        if (!controller.getDrawing().isFocusOwner()) {
+            return false;
+        }
+
+        SelectionManager selectionManager = controller.getSelectionManager();
+        if (selectionManager.isEmpty()) {
+            return false;
+        }
+
+        double step = controller.getDrawing().getSnapToGrid();
+        if (step <= 0) {
+            step = DEFAULT_MOVE_STEP;
+        }
+
+        Point2D deltaMovement = switch (keyEvent.getKeyCode()) {
+            case KeyEvent.VK_LEFT -> new Point2D.Double(-step, 0);
+            case KeyEvent.VK_RIGHT -> new Point2D.Double(step, 0);
+            case KeyEvent.VK_UP -> new Point2D.Double(0, step);
+            case KeyEvent.VK_DOWN -> new Point2D.Double(0, -step);
+            default -> null;
+        };
+
+        if (deltaMovement == null) {
+            return false;
+        }
+
+        List<Entity> entities = List.copyOf(selectionManager.getSelection());
+        MoveAction moveAction = new MoveAction(entities, deltaMovement);
+        moveAction.execute();
+        controller.getUndoManager().addAction(moveAction);
+        controller.getDrawing().repaint();
+        return true;
+    }
+
     @Override
     public void keyReleased(KeyEvent keyEvent) {
         mouseListener.getHoveredControls().forEach(control -> control.onEvent(new KeyboardEntityEvent(control, EventType.KEY_RELEASED, keyEvent)));