fix drag of multiple selected shapes with shift

src/main/java/ovh/gasser/newshapes/ui/Controller.java

@@ -21,7 +21,7 @@ public class Controller {
     private final ShapesView view;
     private final SCollection model;
     private final Selection selection;
-    private boolean shiftPressed;
+    private Point lastMousePos;
 
     Controller(ShapesView view, SCollection model) {
         this.view = view;
@@ -46,20 +46,16 @@ public class Controller {
             public void keyPressed(KeyEvent e) {
                 handleKeyPressed(e);
             }
-
-            @Override
-            public void keyReleased(KeyEvent e) {
-                handleKeyReleased(e);
-            }
         });
     }
 
     private void handleMouseDragged(MouseEvent evt) {
+        int dx = evt.getX() - lastMousePos.x;
+        int dy = evt.getY() - lastMousePos.y;
         for (Shape shape : selection) {
-            int dx = evt.getX() - shape.getBounds().x;
-            int dy = evt.getY() - shape.getBounds().y;
             shape.translate(dx, dy);
         }
+        lastMousePos = evt.getPoint();
         view.repaint();
     }
 
@@ -67,9 +63,10 @@ public class Controller {
         getTarget(evt, this.model)
                 .ifPresentOrElse(
                         s -> {
-                            if (!shiftPressed) {
+                            if (!evt.isShiftDown()) {
                                 resetSelection();
                             }
+                            lastMousePos = evt.getPoint();
                             selection.add(s);
                             logger.debug("Selecting {}", s);
                         },
@@ -84,15 +81,10 @@ public class Controller {
             case KeyEvent.VK_C -> copySelection();
             case KeyEvent.VK_A -> changeSelectionColor();
             case KeyEvent.VK_H -> exportHtml();
-            case KeyEvent.VK_SHIFT -> shiftPressed = true;
             default -> logger.warn("Pressed unhandled key: {}", evt.getKeyChar());
         }
     }
 
-    private void handleKeyReleased(KeyEvent evt) {
-        if (evt.getKeyCode() == KeyEvent.VK_SHIFT) shiftPressed = false;
-    }
-
     private void exportHtml() {
         logger.info("Exporting view to html");
         try {