outline active eraser pen when erasing

info text when no note is available

lib/canvas/my_painter.dart

@@ -80,6 +80,20 @@ class MyPainter extends CustomPainter {
         }
       }
     }
+
+    // active eraser outline
+    if (activePen == Pen.eraser) {
+      final pointerpos = controller.getPointerPosition();
+      if (pointerpos != null) {
+        final translatedPointerpos = _translatept(pointerpos, size);
+        canvas.drawCircle(
+            translatedPointerpos,
+            calcPageDependentScale(zoom, a4Page, canvasSize) * 2.0,
+            paint
+              ..style = PaintingStyle.stroke
+              ..color = Colors.grey);
+      }
+    }
   }
 
   @override

lib/canvas/paint_controller.dart

@@ -12,45 +12,24 @@ import 'my_painter.dart';
 enum Pen { eraser, pen, highlighter, selector }
 
 class PaintController extends ChangeNotifier {
+  final bool _allowDrawWithFinger = false;
+  final NoteFile file;
+
+  Offset? _currentPointerPosition;
   Pen activePen = Pen.pen;
   List<Stroke> strokes = [];
-  final bool _allowDrawWithFinger = false;
 
   PaintController(this.file);
 
-  final NoteFile file;
-
   void changePen(Pen pen) {
     activePen = pen;
     notifyListeners();
   }
 
-  double _calcTiltedWidth(double baseWidth, double tilt) {
-    if (tilt == .0) return baseWidth;
-    return baseWidth * tilt;
-  }
-
-  double _calcAngleDependentWidth(Point pt1, Point pt2, double basetickness) {
-    final delta = pt2.point - pt1.point;
-    final normalizedDelta =
-        delta / sqrt(delta.dx * delta.dx + delta.dy * delta.dy);
-
-    double alpha = asin(normalizedDelta.dy);
-    // range [-pi,pi]
-    alpha += (3 * pi / 4);
-    // range [0,inf]
-    alpha = alpha % (2 * pi);
-    // range [0,2pi]
-    alpha -= pi;
-    // range [-pi,pi]
-    alpha = alpha.abs();
-    // range [0,pi]
-    alpha /= pi;
-    // range [0,1]
-    alpha += .5;
-    // range [.5,1.5]
-
-    return basetickness * alpha;
+  /// return current position of pointer
+  /// null if nowhere hovering or painting
+  Offset? getPointerPosition() {
+    return _currentPointerPosition;
   }
 
   void pointDownEvent(Offset offset, PointerDownEvent e) async {
@@ -73,6 +52,9 @@ class PaintController extends ChangeNotifier {
   }
 
   void pointUpEvent(PointerUpEvent e) {
+    _currentPointerPosition = null;
+    notifyListeners();
+
     if (activePen == Pen.eraser) return;
 
     // pointerupevent doesn't deliver correct event button
@@ -90,14 +72,9 @@ class PaintController extends ChangeNotifier {
     }
   }
 
-  /// check if pointer event is allowed to draw points
-  bool _allowedToDraw(PointerDeviceKind kind, int button) {
-    return (_allowDrawWithFinger && kind == PointerDeviceKind.touch) ||
-        kind == PointerDeviceKind.stylus ||
-        (kind == PointerDeviceKind.mouse && button == kPrimaryMouseButton);
-  }
-
   void pointMoveEvent(Offset offset, PointerMoveEvent event) {
+    _currentPointerPosition = offset;
+
     if (!a4Page.contains(offset)) {
       return;
     }
@@ -106,10 +83,10 @@ class PaintController extends ChangeNotifier {
       switch (activePen) {
         case Pen.eraser:
           // todo dynamic eraser size
-          final eraserrect = Rect.fromCircle(center: offset, radius: 3);
+          final eraserrect = Rect.fromCircle(center: offset, radius: 2.0);
           for (final stroke in strokes) {
             // check if delete action was within bounding rect of stroke
-            if (stroke.getBoundingRect().contains(offset)) {
+            if (stroke.getBoundingRect().overlaps(eraserrect)) {
               // check if eraser hit an point within its range
               for (final pt in stroke.points) {
                 if (eraserrect.contains(pt.point)) {
@@ -155,4 +132,39 @@ class PaintController extends ChangeNotifier {
     debugPrint('finished loading strokes from file');
     notifyListeners();
   }
+
+  /// check if pointer event is allowed to draw points
+  bool _allowedToDraw(PointerDeviceKind kind, int button) {
+    return (_allowDrawWithFinger && kind == PointerDeviceKind.touch) ||
+        kind == PointerDeviceKind.stylus ||
+        (kind == PointerDeviceKind.mouse && button == kPrimaryMouseButton);
+  }
+
+  double _calcAngleDependentWidth(Point pt1, Point pt2, double basetickness) {
+    final delta = pt2.point - pt1.point;
+    final normalizedDelta =
+        delta / sqrt(delta.dx * delta.dx + delta.dy * delta.dy);
+
+    double alpha = asin(normalizedDelta.dy);
+    // range [-pi,pi]
+    alpha += (3 * pi / 4);
+    // range [0,inf]
+    alpha = alpha % (2 * pi);
+    // range [0,2pi]
+    alpha -= pi;
+    // range [-pi,pi]
+    alpha = alpha.abs();
+    // range [0,pi]
+    alpha /= pi;
+    // range [0,1]
+    alpha += .5;
+    // range [.5,1.5]
+
+    return basetickness * alpha;
+  }
+
+  double _calcTiltedWidth(double baseWidth, double tilt) {
+    if (tilt == .0) return baseWidth;
+    return baseWidth * tilt;
+  }
 }

lib/pages/all_notes_page.dart

@@ -209,6 +209,9 @@ class _AllNotesPageState extends State<AllNotesPage> {
   Widget _buildNoteTiles() {
     return Consumer<FileChangeNotifier>(
       builder: (BuildContext context, value, Widget? child) {
+        if (value.tiledata.isEmpty) {
+          return _buildNoNotesText();
+        } else {
           return Expanded(
             child: GridView.builder(
               gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
@@ -250,7 +253,31 @@ class _AllNotesPageState extends State<AllNotesPage> {
               itemCount: value.tiledata.length,
             ),
           );
+        }
       },
     );
   }
+
+  Widget _buildNoNotesText() {
+    return Expanded(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: const [
+          Text(
+            'No notes',
+            style: TextStyle(
+                color: Color.fromRGBO(255, 255, 255, .75), fontSize: 14),
+          ),
+          SizedBox(
+            height: 10,
+          ),
+          Text(
+            'Tap the Add Button to create a note.',
+            style: TextStyle(
+                color: Color.fromRGBO(255, 255, 255, .65), fontSize: 12),
+          )
+        ],
+      ),
+    );
+  }
 }