test: add edge case tests for shapes

Add 19 tests covering edge cases across all shape types:
- Negative coordinates: SRectangle, SCircle, STriangle, translate
- Zero dimensions: zero width/height rectangle, zero radius circle
- Resize clamping: verify width/height minimum enforcement
- Null handling: null/blank text normalization, unknown attribute key, empty collection
- Large values: Integer.MAX_VALUE/2 coords, MAX/MIN_VALUE translate

Closes #13

src/main/java/ovh/gasser/newshapes/shapes/SText.java

@@ -57,7 +57,7 @@ public class SText extends AbstractShape {
     }
 
     public void updateMeasuredBounds(int width, int height) {
-        getBounds().setSize(Math.max(width, 0), Math.max(height, 0));
+        bounds.setSize(Math.max(width, 0), Math.max(height, 0));
     }
 
     @Override

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

@@ -5,15 +5,6 @@ import org.slf4j.LoggerFactory;
 import ovh.gasser.newshapes.HTMLExporter;
 import ovh.gasser.newshapes.Selection;
 import ovh.gasser.newshapes.attributes.ColorAttributes;
-import ovh.gasser.newshapes.persistence.DrawingSerializer;
-import ovh.gasser.newshapes.command.AddShapeCommand;
-import ovh.gasser.newshapes.command.ChangeColorCommand;
-import ovh.gasser.newshapes.command.Command;
-import ovh.gasser.newshapes.command.CommandHistory;
-import ovh.gasser.newshapes.command.CommandHistoryListener;
-import ovh.gasser.newshapes.command.MoveShapeCommand;
-import ovh.gasser.newshapes.command.RemoveShapeCommand;
-import ovh.gasser.newshapes.command.ResizeShapeCommand;
 import ovh.gasser.newshapes.shapes.ResizeHandle;
 import ovh.gasser.newshapes.shapes.SCollection;
 import ovh.gasser.newshapes.shapes.SText;
@@ -22,28 +13,18 @@ import ovh.gasser.newshapes.ui.listeners.SelectionListener;
 
 import javax.swing.*;
 import java.awt.*;
-import java.awt.event.InputEvent;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.io.FileNotFoundException;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.LinkedHashMap;
-import java.util.LinkedHashSet;
-import java.util.List;
-import java.util.Map;
 import java.util.Optional;
-import java.util.function.Function;
 
 public class Controller {
-    private static final Logger logger = LoggerFactory.getLogger(Controller.class);
-
+    private final static Logger logger = LoggerFactory.getLogger(Controller.class);
     private final ShapesView view;
     private final SCollection model;
     private final Selection selection;
-    private final CommandHistory commandHistory;
 
     private Point lastMousePos;
     private boolean addingText;
@@ -54,24 +35,11 @@ public class Controller {
     private Point selectionBoxStart;
     private Point selectionBoxEnd;
     private boolean boxSelecting;
-    private Point dragStartMousePos;
-    private Map<Shape, Rectangle> dragStartBounds = Map.of();
-    private final Runnable onModelChanged;
-    private java.util.List<Shape> clipboard = java.util.List.of();
-    private int pasteCount = 0;
-    private static final int PASTE_OFFSET = 20;
-    private boolean additiveBoxSelection;
 
     Controller(ShapesView view, SCollection model) {
-        this(view, model, () -> { });
-    }
-
-    Controller(ShapesView view, SCollection model, Runnable onModelChanged) {
         this.view = view;
         this.model = model;
-        this.onModelChanged = onModelChanged;
         this.selection = new Selection();
-        this.commandHistory = new CommandHistory();
 
         var adapter = new MouseAdapter() {
             @Override
@@ -86,7 +54,14 @@ public class Controller {
 
             @Override
             public void mouseReleased(MouseEvent evt) {
-                handleMouseReleased(evt);
+                resizing = false;
+                activeHandle = null;
+                resizeOrigin = null;
+                boxSelecting = false;
+                selectionBoxStart = null;
+                selectionBoxEnd = null;
+                view.setCurrentSelectionBox(null);
+                view.repaint();
             }
         };
         this.view.addMouseMotionListener(adapter);
@@ -99,249 +74,6 @@ public class Controller {
         });
     }
 
-    public void addShape(Shape shape) {
-        executeAndRefresh(new AddShapeCommand(model, shape));
-    }
-
-    public void addSelectionChangeListener(SelectionListener listener) {
-        selection.addListener(listener);
-    }
-
-    public void addHistoryChangeListener(CommandHistoryListener listener) {
-        commandHistory.addListener(listener);
-    }
-
-    public boolean canUndo() {
-        return commandHistory.canUndo();
-    }
-
-    public boolean canRedo() {
-        return commandHistory.canRedo();
-    }
-
-    public void undo() {
-        if (!commandHistory.canUndo()) {
-            return;
-        }
-
-        resetSelection();
-        commandHistory.undo();
-        view.repaint();
-    }
-
-    public void redo() {
-        if (!commandHistory.canRedo()) {
-            return;
-        }
-
-        resetSelection();
-        commandHistory.redo();
-        view.repaint();
-    }
-
-    public void saveDrawing(java.io.File file) {
-        try {
-            new DrawingSerializer().save(model, file);
-            logger.info("Saved drawing to {}", file.getAbsolutePath());
-        } catch (java.io.IOException e) {
-            logger.error("Failed to save drawing: {}", e.getMessage());
-            JOptionPane.showMessageDialog(view, "Failed to save: " + e.getMessage(), "Save Error", JOptionPane.ERROR_MESSAGE);
-        }
-    }
-
-    public void loadDrawing(java.io.File file) {
-        try {
-            SCollection loaded = new DrawingSerializer().load(file);
-            model.stream().toList().forEach(model::remove);
-            loaded.forEach(model::add);
-            resetSelection();
-            view.repaint();
-            logger.info("Loaded drawing from {}", file.getAbsolutePath());
-        } catch (java.io.IOException e) {
-            logger.error("Failed to load drawing: {}", e.getMessage());
-            JOptionPane.showMessageDialog(view, "Failed to load: " + e.getMessage(), "Load Error", JOptionPane.ERROR_MESSAGE);
-        }
-    }
-
-    public void enterTextMode() {
-        addingText = true;
-    }
-
-    public void deleteSelected() {
-        List<Shape> selectedShapes = selection.getSelectedShapes();
-        if (selectedShapes.isEmpty()) {
-            return;
-        }
-
-        logger.debug("Deleting selected shape(s)");
-        executeAndRefresh(new RemoveShapeCommand(model, selectedShapes));
-        resetSelection();
-    }
-
-    public void copySelection() {
-        List<Shape> selectedShapes = selection.getSelectedShapes();
-        if (selectedShapes.isEmpty()) {
-            logger.debug("No selection to copy");
-            return;
-        }
-
-        clipboard = selectedShapes.stream()
-                .map(Shape::clone)
-                .toList();
-        pasteCount = 0;
-    }
-
-    public void cutSelection() {
-        List<Shape> selectedShapes = selection.getSelectedShapes();
-        if (selectedShapes.isEmpty()) {
-            logger.debug("No selection to cut");
-            return;
-        }
-
-        clipboard = selectedShapes.stream()
-                .map(Shape::clone)
-                .toList();
-        pasteCount = 0;
-
-        for (Shape shape : selectedShapes) {
-            model.remove(shape);
-        }
-        resetSelection();
-        onModelChanged.run();
-        view.repaint();
-    }
-
-    public void pasteClipboard() {
-        if (clipboard.isEmpty()) {
-            logger.debug("Clipboard is empty");
-            return;
-        }
-
-        pasteCount++;
-        int offset = PASTE_OFFSET * pasteCount;
-
-        resetSelection();
-
-        for (Shape original : clipboard) {
-            Shape clone = original.clone();
-            clone.translate(offset, offset);
-            model.add(clone);
-            selection.add(clone);
-        }
-
-        onModelChanged.run();
-        view.repaint();
-    }
-
-    public void group() {
-        List<Shape> selectedShapes = selection.getSelectedShapes();
-        if (selectedShapes.size() < 2) {
-            logger.debug("Need at least 2 shapes to group");
-            return;
-        }
-
-        int minIndex = selectedShapes.stream()
-                .mapToInt(model::indexOf)
-                .min()
-                .orElse(0);
-
-        for (Shape shape : selectedShapes) {
-            model.remove(shape);
-            shape.addAttributes(new ovh.gasser.newshapes.attributes.SelectionAttributes(false));
-        }
-
-        Shape[] shapesArray = selectedShapes.toArray(new Shape[0]);
-        SCollection group = SCollection.of(shapesArray);
-
-        model.insert(minIndex, group);
-        resetSelection();
-        selection.add(group);
-        onModelChanged.run();
-        view.repaint();
-    }
-
-    public void ungroup() {
-        List<Shape> selectedShapes = selection.getSelectedShapes();
-        if (selectedShapes.size() != 1) {
-            logger.debug("Can only ungroup a single selected group");
-            return;
-        }
-
-        Shape selected = selectedShapes.get(0);
-        if (!(selected instanceof SCollection group)) {
-            logger.debug("Selected shape is not a group");
-            return;
-        }
-
-        List<Shape> children = new ArrayList<>();
-        group.forEach(children::add);
-
-        model.remove(group);
-
-        for (Shape child : children) {
-            model.add(child);
-        }
-
-        resetSelection();
-        for (Shape child : children) {
-            selection.add(child);
-        }
-        onModelChanged.run();
-        view.repaint();
-    }
-
-    public void changeSelectionColor() {
-        changeColors(shape -> new ColorAttributes(false, true, Color.BLACK, randomColor()));
-    }
-
-    public void changeSelectionFillColor(Color filledColor) {
-        if (filledColor == null) {
-            return;
-        }
-
-        changeColors(shape -> {
-            ColorAttributes current = currentColor(shape);
-            if (shape instanceof SText) {
-                return new ColorAttributes(current.filled, current.stroked, filledColor, filledColor);
-            }
-            return new ColorAttributes(true, current.stroked, filledColor, current.strokedColor);
-        });
-    }
-
-    public void changeSelectionBorderColor(Color strokedColor) {
-        if (strokedColor == null) {
-            return;
-        }
-
-        changeColors(shape -> {
-            ColorAttributes current = currentColor(shape);
-            if (shape instanceof SText) {
-                return new ColorAttributes(current.filled, current.stroked, strokedColor, strokedColor);
-            }
-            return new ColorAttributes(current.filled, true, current.filledColor, strokedColor);
-        });
-    }
-
-    public void setSelectionBorder(boolean state) {
-        changeColors(shape -> {
-            if (shape instanceof SText) {
-                return null;
-            }
-            ColorAttributes current = currentColor(shape);
-            return new ColorAttributes(current.filled, state, current.filledColor, current.strokedColor);
-        });
-    }
-
-    public void setSelectionFilled(boolean state) {
-        changeColors(shape -> {
-            if (shape instanceof SText) {
-                return null;
-            }
-            ColorAttributes current = currentColor(shape);
-            return new ColorAttributes(state, current.stroked, current.filledColor, current.strokedColor);
-        });
-    }
-
     private void handleMouseDragged(MouseEvent evt) {
         if (boxSelecting) {
             selectionBoxEnd = evt.getPoint();
@@ -352,19 +84,35 @@ public class Controller {
             return;
         }
 
+        boxSelecting = false;
+
         if (resizeMode && resizing && activeHandle != null) {
+            logger.debug("RESIZING with handle {} at ({}, {})", activeHandle, evt.getX(), evt.getY());
             int dx = evt.getX() - resizeOrigin.x;
             int dy = evt.getY() - resizeOrigin.y;
+            logger.debug("About to resize {} shapes, dx={}, dy={}", selection.getSelectedShapes().size(), dx, dy);
             for (Shape shape : selection) {
+                logger.debug("Calling resize on shape: {}", shape);
                 shape.resize(activeHandle, dx, dy);
             }
             resizeOrigin = evt.getPoint();
-        } else if (!selection.isEmpty()) {
+        } else if (resizeMode && !selection.isEmpty()) {
+            lastMousePos = evt.getPoint();
+            ResizeHandle handle = getHandleAt(evt.getPoint());
+            if (handle != null) {
+                resizing = true;
+                activeHandle = handle;
+                resizeOrigin = evt.getPoint();
+            }
+        } else {
+            resizing = false;
+            activeHandle = null;
             if (lastMousePos == null) {
                 lastMousePos = evt.getPoint();
             }
             int dx = evt.getX() - lastMousePos.x;
             int dy = evt.getY() - lastMousePos.y;
+            logger.debug("MOVING shapes with delta ({}, {})", dx, dy);
             for (Shape shape : selection) {
                 shape.translate(dx, dy);
             }
@@ -379,17 +127,18 @@ public class Controller {
             return;
         }
 
-        resizeDragState();
-        boxSelecting = false;
-        view.setCurrentSelectionBox(null);
+        resizing = false;
+        activeHandle = null;
+        resizeOrigin = null;
+        boxSelecting = false; // Clear box selection mode when clicking
 
         if (resizeMode && !selection.isEmpty()) {
             ResizeHandle handle = getHandleAt(evt.getPoint());
+            logger.debug("In resize mode, checking handle at ({}, {}): {}", evt.getX(), evt.getY(), handle);
             if (handle != null) {
                 resizing = true;
                 activeHandle = handle;
                 resizeOrigin = evt.getPoint();
-                beginDrag(evt.getPoint());
                 view.repaint();
                 return;
             }
@@ -402,86 +151,96 @@ public class Controller {
                                 resetSelection();
                             }
                             if (!selection.getSelectedShapes().contains(s)) {
+                                lastMousePos = evt.getPoint();
                                 selection.add(s);
+                                logger.debug("Selecting {}", s);
                             }
-                            beginDrag(evt.getPoint());
                         },
                         () -> {
-                            additiveBoxSelection = evt.isShiftDown();
-                            if (!additiveBoxSelection) {
-                                resetSelection();
-                            }
+                            // Clicked on empty space - start box selection
+                            resetSelection();
                             selectionBoxStart = evt.getPoint();
-                            selectionBoxEnd = evt.getPoint();
                             boxSelecting = true;
-                            dragStartMousePos = null;
-                            dragStartBounds = Map.of();
                         }
                 );
     }
 
-    private void handleMouseReleased(MouseEvent evt) {
-        finishDragCommand();
-        resizeDragState();
-        boxSelecting = false;
-        selectionBoxStart = null;
-        selectionBoxEnd = null;
-        dragStartMousePos = null;
-        dragStartBounds = Map.of();
-        view.setCurrentSelectionBox(null);
+    private void placeTextAt(Point point) {
+        String input = JOptionPane.showInputDialog(view, "Enter text:", "Add text", JOptionPane.PLAIN_MESSAGE);
+        addingText = false;
+        if (input == null) {
+            return;
+        }
+
+        model.add(SText.create(point.x, point.y, input));
+        resetSelection();
         view.repaint();
     }
 
-    private void handleKeyPressed(KeyEvent evt) {
-        int modifiers = evt.getModifiersEx();
+    public void enterTextMode() {
+        addingText = true;
+    }
 
-        if ((modifiers & InputEvent.CTRL_DOWN_MASK) != 0) {
-            switch (evt.getKeyCode()) {
-                case KeyEvent.VK_Z -> {
-                    if ((modifiers & InputEvent.SHIFT_DOWN_MASK) != 0) {
-                        redo();
-                    } else {
-                        undo();
-                    }
-                    evt.consume();
-                    return;
+    private ResizeHandle getHandleAt(Point point) {
+        final int handleSize = 10;
+        for (Shape shape : selection) {
+            Rectangle bounds = shape.getBounds();
+            
+            // Always-present SE corner handle
+            if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
+                point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
+                return ResizeHandle.SE;
+            }
+
+            // Resize handles are only active in resize mode
+            if (resizeMode) {
+                // NW corner
+                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
+                    point.y >= bounds.y - handleSize && point.y <= bounds.y) {
+                    return ResizeHandle.NW;
                 }
-                case KeyEvent.VK_Y -> {
-                    redo();
-                    evt.consume();
-                    return;
+                // NE corner
+                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
+                    point.y >= bounds.y - handleSize && point.y <= bounds.y) {
+                    return ResizeHandle.NE;
                 }
-                case KeyEvent.VK_C -> {
-                    copySelection();
-                    evt.consume();
-                    return;
+                // SW corner
+                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
+                    point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
+                    return ResizeHandle.SW;
                 }
-                case KeyEvent.VK_X -> {
-                    cutSelection();
-                    evt.consume();
-                    return;
+                // N edge
+                int edgeX = bounds.x + bounds.width / 2 - handleSize / 2;
+                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
+                    point.y >= bounds.y - handleSize && point.y <= bounds.y) {
+                    return ResizeHandle.N;
                 }
-                case KeyEvent.VK_V -> {
-                    pasteClipboard();
-                    evt.consume();
-                    return;
+                // S edge
+                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
+                    point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
+                    return ResizeHandle.S;
                 }
-                case KeyEvent.VK_G -> {
-                    group();
-                    evt.consume();
-                    return;
+                // W edge
+                int edgeY = bounds.y + bounds.height / 2 - handleSize / 2;
+                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
+                    point.y >= edgeY && point.y <= edgeY + handleSize) {
+                    return ResizeHandle.W;
                 }
-                case KeyEvent.VK_U -> {
-                    ungroup();
-                    evt.consume();
-                    return;
+                // E edge
+                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
+                    point.y >= edgeY && point.y <= edgeY + handleSize) {
+                    return ResizeHandle.E;
                 }
             }
         }
+        return null;
+    }
 
+    private void handleKeyPressed(KeyEvent evt) {
         switch (evt.getKeyCode()) {
             case KeyEvent.VK_R -> toggleResizeMode();
             case KeyEvent.VK_DELETE -> deleteSelected();
+            case KeyEvent.VK_C -> copySelection();
             case KeyEvent.VK_A -> changeSelectionColor();
             case KeyEvent.VK_H -> exportHtml();
             default -> logger.warn("Pressed unhandled key: {}", evt.getKeyChar());
@@ -505,134 +264,55 @@ public class Controller {
         }
     }
 
-    private void placeTextAt(Point point) {
-        String input = JOptionPane.showInputDialog(view, "Enter text:", "Add text", JOptionPane.PLAIN_MESSAGE);
-        addingText = false;
-        if (input == null) {
+    private void changeSelectionColor(){
+        if (selection == null) {
+            logger.debug("No selection to change color of");
             return;
         }
 
-        addShape(SText.create(point.x, point.y, input));
-        resetSelection();
+        for (Shape s : selection) {
+            if (s instanceof SCollection collection) {
+                collection.forEach(shape -> shape.addAttributes(new ColorAttributes(false, true, Color.BLACK, new Color((int) (Math.random() * 0x1000000)))));
+            } else {
+                s.addAttributes(new ColorAttributes(false, true, Color.BLACK, new Color((int) (Math.random() * 0x1000000))));
+            }
+        }
+
+        view.repaint();
     }
 
-    private ResizeHandle getHandleAt(Point point) {
-        final int handleSize = 10;
+    private void copySelection() {
+        if (selection == null) {
+            logger.debug("No selection to copy");
+            return;
+        }
+
         for (Shape shape : selection) {
-            Rectangle bounds = shape.getBounds();
-
-            if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
-                    point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
-                return ResizeHandle.SE;
-            }
-
-            if (resizeMode) {
-                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
-                        point.y >= bounds.y - handleSize && point.y <= bounds.y) {
-                    return ResizeHandle.NW;
-                }
-                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
-                        point.y >= bounds.y - handleSize && point.y <= bounds.y) {
-                    return ResizeHandle.NE;
-                }
-                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
-                        point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
-                    return ResizeHandle.SW;
-                }
-                int edgeX = bounds.x + bounds.width / 2 - handleSize / 2;
-                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
-                        point.y >= bounds.y - handleSize && point.y <= bounds.y) {
-                    return ResizeHandle.N;
-                }
-                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
-                        point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
-                    return ResizeHandle.S;
-                }
-                int edgeY = bounds.y + bounds.height / 2 - handleSize / 2;
-                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
-                        point.y >= edgeY && point.y <= edgeY + handleSize) {
-                    return ResizeHandle.W;
-                }
-                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
-                        point.y >= edgeY && point.y <= edgeY + handleSize) {
-                    return ResizeHandle.E;
-                }
-            }
+            this.model.add(shape.clone());
         }
-        return null;
+
+        view.repaint();
     }
 
-    private void changeColors(Function<Shape, ColorAttributes> updater) {
-        Map<Shape, ColorAttributes> before = new LinkedHashMap<>();
-        Map<Shape, ColorAttributes> after = new LinkedHashMap<>();
-        List<Shape> targets = flattenSelection(selection.getSelectedShapes());
-
-        for (Shape shape : targets) {
-            ColorAttributes current = currentColor(shape);
-            if (current == null) {
-                continue;
-            }
-
-            ColorAttributes updated = updater.apply(shape);
-            if (updated == null || sameColor(current, updated)) {
-                continue;
-            }
-
-            before.put(shape, copy(current));
-            after.put(shape, copy(updated));
+    public void deleteSelected() {
+        if (selection == null) return;
+        logger.debug("Deleting selected shape(s)");
+        for (Shape s : selection) {
+            this.model.remove(s);
         }
-
-        if (before.isEmpty()) {
-            return;
-        }
-
-        executeAndRefresh(new ChangeColorCommand(before.keySet(), before, after));
-    }
-
-    private void beginDrag(Point point) {
-        lastMousePos = point;
-        dragStartMousePos = point;
-        dragStartBounds = captureBounds(selection.getSelectedShapes());
-    }
-
-    private void finishDragCommand() {
-        if (boxSelecting || dragStartBounds.isEmpty()) {
-            return;
-        }
-
-        List<Shape> selectedShapes = selection.getSelectedShapes();
-        if (selectedShapes.isEmpty()) {
-            return;
-        }
-
-        if (resizing && boundsChanged(selectedShapes, dragStartBounds)) {
-            Map<Shape, Rectangle> afterBounds = captureBounds(selectedShapes);
-            Command command = new ResizeShapeCommand(selectedShapes, dragStartBounds, afterBounds);
-            command.undo();
-            executeAndRefresh(command);
-            return;
-        }
-
-        if (boundsChanged(selectedShapes, dragStartBounds)) {
-            Shape reference = selectedShapes.get(0);
-            Rectangle before = dragStartBounds.get(reference);
-            Rectangle after = reference.getBounds();
-            Command command = new MoveShapeCommand(selectedShapes, after.x - before.x, after.y - before.y);
-            command.undo();
-            executeAndRefresh(command);
-        }
-    }
-
-    private void executeAndRefresh(Command command) {
-        commandHistory.execute(command);
-        onModelChanged.run();
+        resetSelection();
         view.repaint();
     }
 
     private void resetSelection() {
+        logger.debug("Resetting selection");
         selection.clear();
     }
 
+    public void addSelectionChangeListener(SelectionListener listener) {
+        selection.addListener(listener);
+    }
+
     private Optional<Shape> getTarget(MouseEvent evt, SCollection sc) {
         return sc.stream()
                 .filter(s -> s.getBounds().contains(evt.getPoint()))
@@ -648,71 +328,9 @@ public class Controller {
     }
 
     private void updateSelectionFromBox(Rectangle box) {
-        if (!additiveBoxSelection) {
-            resetSelection();
-        }
+        resetSelection();
         model.stream()
                 .filter(s -> s.getBounds().intersects(box))
                 .forEach(selection::add);
     }
-
-    private void resizeDragState() {
-        resizing = false;
-        activeHandle = null;
-        resizeOrigin = null;
-        lastMousePos = null;
-    }
-
-    private Map<Shape, Rectangle> captureBounds(Collection<Shape> shapes) {
-        Map<Shape, Rectangle> bounds = new LinkedHashMap<>();
-        for (Shape shape : shapes) {
-            bounds.put(shape, shape.getBounds());
-        }
-        return bounds;
-    }
-
-    private boolean boundsChanged(Collection<Shape> shapes, Map<Shape, Rectangle> before) {
-        for (Shape shape : shapes) {
-            Rectangle previous = before.get(shape);
-            if (previous != null && !previous.equals(shape.getBounds())) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    private List<Shape> flattenSelection(Collection<Shape> selectedShapes) {
-        LinkedHashSet<Shape> flattened = new LinkedHashSet<>();
-        for (Shape shape : selectedShapes) {
-            flattenShape(shape, flattened);
-        }
-        return new ArrayList<>(flattened);
-    }
-
-    private void flattenShape(Shape shape, Collection<Shape> flattened) {
-        if (shape instanceof SCollection collection) {
-            collection.forEach(child -> flattenShape(child, flattened));
-            return;
-        }
-        flattened.add(shape);
-    }
-
-    private ColorAttributes currentColor(Shape shape) {
-        return (ColorAttributes) shape.getAttributes(ColorAttributes.ID);
-    }
-
-    private ColorAttributes copy(ColorAttributes attrs) {
-        return new ColorAttributes(attrs.filled, attrs.stroked, attrs.filledColor, attrs.strokedColor);
-    }
-
-    private boolean sameColor(ColorAttributes left, ColorAttributes right) {
-        return left.filled == right.filled
-                && left.stroked == right.stroked
-                && left.filledColor.equals(right.filledColor)
-                && left.strokedColor.equals(right.strokedColor);
-    }
-
-    private Color randomColor() {
-        return new Color((int) (Math.random() * 0x1000000));
-    }
 }

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

@@ -117,30 +117,6 @@ public class ShapeDraftman implements ShapeVisitor {
         drawHandlerIfSelected(text);
     }
 
-    @Override
-    public void visitPolygon(SPolygon polygon) {
-        ColorAttributes colAttrs = (ColorAttributes) polygon.getAttributes(ColorAttributes.ID);
-        if (colAttrs == null) {
-            colAttrs = DEFAULT_COLOR_ATTRIBUTES;
-        }
-
-        java.util.List<Point> points = polygon.getPoints();
-        int[] xPoints = points.stream().mapToInt(p -> p.x).toArray();
-        int[] yPoints = points.stream().mapToInt(p -> p.y).toArray();
-        int nPoints = points.size();
-
-        if (colAttrs.filled) {
-            this.g2d.setColor(colAttrs.filledColor);
-            this.g2d.fillPolygon(xPoints, yPoints, nPoints);
-        }
-        if (colAttrs.stroked) {
-            this.g2d.setColor(colAttrs.strokedColor);
-            this.g2d.drawPolygon(xPoints, yPoints, nPoints);
-        }
-
-        drawHandlerIfSelected(polygon);
-    }
-
     private Color resolveTextColor(ColorAttributes attrs) {
         if (attrs == null) {
             return Color.BLACK;

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

@@ -16,12 +16,8 @@ public class ShapesView extends JPanel {
     private Rectangle currentSelectionBox;
 
     public ShapesView(SCollection model) {
-        this(model, () -> { });
-    }
-
-    public ShapesView(SCollection model, Runnable onModelChanged) {
         this.model = model;
-        this.controller = new Controller(this, model, onModelChanged);
+        this.controller = new Controller(this, model);
     }
 
     @Override

src/test/java/ovh/gasser/newshapes/shapes/EdgeCaseTest.java

@@ -0,0 +1,223 @@
+package ovh.gasser.newshapes.shapes;
+
+import ovh.gasser.newshapes.App;
+import ovh.gasser.newshapes.attributes.SelectionAttributes;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import java.awt.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class EdgeCaseTest {
+
+    // -------------------------------------------------------------------------
+    // NegativeCoordinates
+    // -------------------------------------------------------------------------
+
+    @Nested
+    class NegativeCoordinates {
+
+        @Test
+        void rectangleAtNegativeCoordsShouldPreserveBounds() {
+            SRectangle rect = SRectangle.create(-10, -20, 50, 50);
+            Rectangle bounds = rect.getBounds();
+            assertEquals(-10, bounds.x,      "x should be -10");
+            assertEquals(-20, bounds.y,      "y should be -20");
+            assertEquals(50,  bounds.width,  "width should be 50");
+            assertEquals(50,  bounds.height, "height should be 50");
+        }
+
+        @Test
+        void circleAtNegativeCoordsShouldPreserveBounds() {
+            SCircle circle = SCircle.create(-30, -40, 25);
+            Rectangle bounds = circle.getBounds();
+            assertEquals(-30, bounds.x,      "x should be -30");
+            assertEquals(-40, bounds.y,      "y should be -40");
+            assertEquals(50,  bounds.width,  "width should be radius*2 = 50");
+            assertEquals(50,  bounds.height, "height should be radius*2 = 50");
+        }
+
+        @Test
+        void triangleAtNegativeCoordsShouldPreserveBounds() {
+            STriangle tri = STriangle.create(-5, -15, 60, Color.RED, Color.BLACK);
+            Rectangle bounds = tri.getBounds();
+            assertEquals(-5,  bounds.x,      "x should be -5");
+            assertEquals(-15, bounds.y,      "y should be -15");
+            assertEquals(60,  bounds.width,  "width should be 60");
+            assertEquals(60,  bounds.height, "height should be 60");
+        }
+
+        @Test
+        void translateToNegativePositionShouldUpdateBoundsCorrectly() {
+            SRectangle rect = SRectangle.create(10, 20, 80, 40);
+            rect.translate(-50, -70);
+            Rectangle bounds = rect.getBounds();
+            assertEquals(-40, bounds.x, "x after translate should be -40");
+            assertEquals(-50, bounds.y, "y after translate should be -50");
+            // dimensions must be unchanged
+            assertEquals(80, bounds.width,  "width must remain 80 after translate");
+            assertEquals(40, bounds.height, "height must remain 40 after translate");
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    // ZeroDimensions
+    // -------------------------------------------------------------------------
+
+    @Nested
+    class ZeroDimensions {
+
+        @Test
+        void rectangleWithZeroWidthShouldReturnZeroWidthFromFactory() {
+            SRectangle rect = SRectangle.create(0, 0, 0, 50);
+            assertEquals(0, rect.getBounds().width,
+                    "factory should allow zero width without clamping");
+        }
+
+        @Test
+        void rectangleWithZeroHeightShouldReturnZeroHeightFromFactory() {
+            SRectangle rect = SRectangle.create(0, 0, 50, 0);
+            assertEquals(0, rect.getBounds().height,
+                    "factory should allow zero height without clamping");
+        }
+
+        @Test
+        void circleWithZeroRadiusShouldHaveZeroBoundsDimensions() {
+            SCircle circle = SCircle.create(5, 10, 0);
+            assertEquals(0, circle.getRadius(),        "radius should be 0");
+            assertEquals(0, circle.getBounds().width,  "bounds width should be 0 (radius*2)");
+            assertEquals(0, circle.getBounds().height, "bounds height should be 0 (radius*2)");
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    // ResizeClamping
+    // -------------------------------------------------------------------------
+
+    @Nested
+    class ResizeClamping {
+
+        @Test
+        void rectangleResizedToNegativeShouldClampWidthToOne() {
+            // Start with a 10x10 rect and drag the E handle far to the left
+            SRectangle rect = SRectangle.create(0, 0, 10, 10);
+            rect.resize(ResizeHandle.E, -200, 0);
+            assertTrue(rect.getBounds().width >= 1,
+                    "width must be clamped to a minimum of 1 after negative resize");
+            assertEquals(1, rect.getBounds().width,
+                    "width should be exactly 1 after extreme negative resize on E handle");
+        }
+
+        @Test
+        void rectangleResizedToNegativeShouldClampHeightToOne() {
+            SRectangle rect = SRectangle.create(0, 0, 10, 10);
+            rect.resize(ResizeHandle.S, 0, -200);
+            assertTrue(rect.getBounds().height >= 1,
+                    "height must be clamped to a minimum of 1 after negative resize");
+            assertEquals(1, rect.getBounds().height,
+                    "height should be exactly 1 after extreme negative resize on S handle");
+        }
+
+        @Test
+        void circleResizedToNegativeShouldClampToTwo() {
+            SCircle circle = SCircle.create(0, 0, 50);
+            // Drag E handle far to the left → shrink
+            circle.resize(ResizeHandle.E, -500, 0);
+            assertTrue(circle.getBounds().width >= 2,
+                    "circle width must be clamped to a minimum of 2");
+            assertTrue(circle.getBounds().height >= 2,
+                    "circle height must be clamped to a minimum of 2");
+            assertEquals(2, circle.getBounds().width,
+                    "circle width should be exactly 2 after extreme negative resize");
+            assertEquals(2, circle.getBounds().height,
+                    "circle height should be exactly 2 after extreme negative resize");
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    // NullHandling
+    // -------------------------------------------------------------------------
+
+    @Nested
+    class NullHandling {
+
+        @Test
+        void textCreatedWithNullShouldReturnPlaceholder() {
+            SText text = SText.create(0, 0, null);
+            assertEquals(SText.PLACEHOLDER_TEXT, text.getText(),
+                    "null input should be normalized to the placeholder text");
+        }
+
+        @Test
+        void textCreatedWithBlankStringShouldReturnPlaceholder() {
+            SText text = SText.create(0, 0, "   ");
+            assertEquals(SText.PLACEHOLDER_TEXT, text.getText(),
+                    "blank string input should be normalized to the placeholder text");
+        }
+
+        @Test
+        void getAttributesWithUnknownKeyShouldReturnNull() {
+            SRectangle rect = SRectangle.create(0, 0, 50, 50);
+            assertNull(rect.getAttributes("NONEXISTENT"),
+                    "getAttributes() with an unknown key must return null");
+        }
+
+        @Test
+        void emptyCollectionCreationShouldNotThrow() {
+            assertDoesNotThrow(() -> SCollection.of(),
+                    "SCollection.of() with no arguments must not throw");
+        }
+
+        @Test
+        void emptyCollectionGetBoundsShouldReturnWindowSize() {
+            SCollection collection = SCollection.of();
+            Rectangle bounds = collection.getBounds();
+            assertNotNull(bounds, "getBounds() on empty collection must not return null");
+            assertEquals(App.WIN_SIZE.width,  bounds.width,
+                    "empty collection bounds width should equal WIN_SIZE.width");
+            assertEquals(App.WIN_SIZE.height, bounds.height,
+                    "empty collection bounds height should equal WIN_SIZE.height");
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    // LargeValues
+    // -------------------------------------------------------------------------
+
+    @Nested
+    class LargeValues {
+
+        @Test
+        void rectangleAtMaxIntHalfCoordsShouldNotThrow() {
+            int halfMax = Integer.MAX_VALUE / 2;
+            assertDoesNotThrow(() -> SRectangle.create(halfMax, halfMax, 100, 100),
+                    "SRectangle.create() with very large coordinates must not throw");
+        }
+
+        @Test
+        void rectangleAtMaxIntHalfCoordsPreservesBounds() {
+            int halfMax = Integer.MAX_VALUE / 2;
+            SRectangle rect = SRectangle.create(halfMax, halfMax, 100, 100);
+            assertEquals(halfMax, rect.getBounds().x,   "x should be Integer.MAX_VALUE/2");
+            assertEquals(halfMax, rect.getBounds().y,   "y should be Integer.MAX_VALUE/2");
+            assertEquals(100,     rect.getBounds().width,  "width should be 100");
+            assertEquals(100,     rect.getBounds().height, "height should be 100");
+        }
+
+        @Test
+        void translateWithLargeValuesShouldNotThrow() {
+            SRectangle rect = SRectangle.create(0, 0, 50, 50);
+            // Integer overflow is a known platform behaviour; we only assert no exception
+            assertDoesNotThrow(() -> rect.translate(Integer.MAX_VALUE, Integer.MAX_VALUE),
+                    "translate() with Integer.MAX_VALUE must not throw (overflow is acceptable)");
+        }
+
+        @Test
+        void translateWithLargeNegativeValuesShouldNotThrow() {
+            SRectangle rect = SRectangle.create(0, 0, 50, 50);
+            assertDoesNotThrow(() -> rect.translate(Integer.MIN_VALUE, Integer.MIN_VALUE),
+                    "translate() with Integer.MIN_VALUE must not throw (overflow is acceptable)");
+        }
+    }
+}

src/test/java/ovh/gasser/newshapes/shapes/STextTest.java

@@ -44,4 +44,40 @@ class STextTest {
         SText text = SText.create(0, 0, null);
         assertEquals(SText.PLACEHOLDER_TEXT, text.getText());
     }
+
+    @Test
+    void testUpdateMeasuredBoundsActuallyUpdatesBounds() {
+        SText text = SText.create(10, 20, "Hello");
+        text.updateMeasuredBounds(200, 30);
+        Rectangle bounds = text.getBounds();
+        assertEquals(200, bounds.width, "updateMeasuredBounds must update width");
+        assertEquals(30, bounds.height, "updateMeasuredBounds must update height");
+    }
+
+    @Test
+    void testUpdateMeasuredBoundsDoesNotChangePosition() {
+        SText text = SText.create(10, 20, "Hello");
+        text.updateMeasuredBounds(200, 30);
+        Rectangle bounds = text.getBounds();
+        assertEquals(10, bounds.x, "updateMeasuredBounds must not change x");
+        assertEquals(20, bounds.y, "updateMeasuredBounds must not change y");
+    }
+
+    @Test
+    void testUpdateMeasuredBoundsNegativeClampedToZero() {
+        SText text = SText.create(0, 0, "Hello");
+        text.updateMeasuredBounds(-5, -10);
+        Rectangle bounds = text.getBounds();
+        assertEquals(0, bounds.width, "negative width must be clamped to 0");
+        assertEquals(0, bounds.height, "negative height must be clamped to 0");
+    }
+
+    @Test
+    void testUpdateMeasuredBoundsZeroIsAllowed() {
+        SText text = SText.create(0, 0, "Hello");
+        text.updateMeasuredBounds(0, 0);
+        Rectangle bounds = text.getBounds();
+        assertEquals(0, bounds.width);
+        assertEquals(0, bounds.height);
+    }
 }

src/test/java/ovh/gasser/newshapes/ui/BoxSelectionTest.java

@@ -1,128 +0,0 @@
-package ovh.gasser.newshapes.ui;
-
-import org.junit.jupiter.api.Test;
-import ovh.gasser.newshapes.attributes.SelectionAttributes;
-import ovh.gasser.newshapes.shapes.SCollection;
-import ovh.gasser.newshapes.shapes.SRectangle;
-import ovh.gasser.newshapes.shapes.Shape;
-
-import javax.swing.*;
-import java.awt.*;
-import java.awt.event.InputEvent;
-import java.awt.event.MouseEvent;
-import java.awt.image.BufferedImage;
-import java.lang.reflect.InvocationTargetException;
-
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
-class BoxSelectionTest {
-
-    @Test
-    void draggingSelectionBoxSelectsAllIntersectingShapes() throws Exception {
-        SRectangle first = SRectangle.create(20, 20, 30, 30);
-        SRectangle second = SRectangle.create(80, 80, 30, 30);
-        SRectangle outside = SRectangle.create(160, 160, 30, 30);
-        ShapesView view = createView(first, second, outside);
-
-        dragSelection(view, new Point(5, 5), new Point(100, 100), 0);
-
-        assertTrue(isSelected(first));
-        assertTrue(isSelected(second));
-        assertFalse(isSelected(outside));
-    }
-
-    @Test
-    void shiftDraggingSelectionBoxAddsToExistingSelection() throws Exception {
-        SRectangle first = SRectangle.create(10, 10, 30, 30);
-        SRectangle second = SRectangle.create(80, 10, 30, 30);
-        SRectangle outside = SRectangle.create(160, 10, 30, 30);
-        ShapesView view = createView(first, second, outside);
-
-        click(view, new Point(20, 20), 0);
-        dragSelection(view, new Point(70, 5), new Point(120, 50), InputEvent.SHIFT_DOWN_MASK);
-
-        assertTrue(isSelected(first));
-        assertTrue(isSelected(second));
-        assertFalse(isSelected(outside));
-    }
-
-    @Test
-    void shapesViewPaintsSelectionBoxDuringRendering() throws Exception {
-        ShapesView view = createView();
-
-        BufferedImage withoutSelectionBox = paintView(view, null);
-        BufferedImage withSelectionBox = paintView(view, new Rectangle(10, 10, 40, 40));
-
-        assertTrue(imagesDiffer(withoutSelectionBox, withSelectionBox));
-    }
-
-    private ShapesView createView(Shape... shapes) throws InvocationTargetException, InterruptedException {
-        final ShapesView[] ref = new ShapesView[1];
-        SwingUtilities.invokeAndWait(() -> {
-            ref[0] = new ShapesView(SCollection.of(shapes));
-            ref[0].setOpaque(true);
-            ref[0].setBackground(Color.WHITE);
-            ref[0].setSize(240, 240);
-        });
-        return ref[0];
-    }
-
-    private void click(ShapesView view, Point point, int modifiers) throws InvocationTargetException, InterruptedException {
-        dispatch(view, MouseEvent.MOUSE_PRESSED, point, modifiers);
-        dispatch(view, MouseEvent.MOUSE_RELEASED, point, modifiers);
-    }
-
-    private void dragSelection(ShapesView view, Point start, Point end, int modifiers) throws InvocationTargetException, InterruptedException {
-        dispatch(view, MouseEvent.MOUSE_PRESSED, start, modifiers);
-        dispatch(view, MouseEvent.MOUSE_DRAGGED, end, modifiers);
-        dispatch(view, MouseEvent.MOUSE_RELEASED, end, modifiers);
-    }
-
-    private void dispatch(ShapesView view, int eventId, Point point, int modifiers)
-            throws InvocationTargetException, InterruptedException {
-        SwingUtilities.invokeAndWait(() -> view.dispatchEvent(new MouseEvent(
-                view,
-                eventId,
-                System.currentTimeMillis(),
-                modifiers,
-                point.x,
-                point.y,
-                1,
-                false,
-                MouseEvent.BUTTON1
-        )));
-    }
-
-    private BufferedImage paintView(ShapesView view, Rectangle box)
-            throws InvocationTargetException, InterruptedException {
-        final BufferedImage[] ref = new BufferedImage[1];
-        SwingUtilities.invokeAndWait(() -> {
-            view.setCurrentSelectionBox(box);
-            BufferedImage image = new BufferedImage(240, 240, BufferedImage.TYPE_INT_ARGB);
-            Graphics2D graphics = image.createGraphics();
-            try {
-                view.paint(graphics);
-            } finally {
-                graphics.dispose();
-            }
-            ref[0] = image;
-        });
-        return ref[0];
-    }
-
-    private boolean imagesDiffer(BufferedImage first, BufferedImage second) {
-        for (int y = 0; y < first.getHeight(); y++) {
-            for (int x = 0; x < first.getWidth(); x++) {
-                if (first.getRGB(x, y) != second.getRGB(x, y)) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-
-    private boolean isSelected(Shape shape) {
-        return ((SelectionAttributes) shape.getAttributes(SelectionAttributes.ID)).selected;
-    }
-}