VisualBuilder: Don't allow moving/resizing widgets that are in a layout

Also paint these widgets' grabbers differently to make it stand out
visually which widgets have managed geometry. :^)

DevTools/VisualBuilder/VBForm.cpp

@@ -96,7 +96,11 @@ void VBForm::second_paint_event(GPaintEvent& event)
     for (auto& widget : m_widgets) {
         if (widget.is_selected()) {
             for_each_direction([&](auto direction) {
-                painter.fill_rect(widget.grabber_rect(direction), Color::Black);
+                bool in_layout = widget.is_in_layout();
+                auto grabber_rect = widget.grabber_rect(direction);
+                painter.fill_rect(grabber_rect, in_layout ? Color::White : Color::Black);
+                if (in_layout)
+                    painter.draw_rect(grabber_rect, Color::Black);
             });
         }
     }
@@ -211,6 +215,8 @@ void VBForm::mousedown_event(GMouseEvent& event)
     if (m_resize_direction == Direction::None) {
         bool hit_grabber = false;
         for_each_selected_widget([&](auto& widget) {
+            if (widget.is_in_layout())
+                return;
             auto grabber = widget.grabber_at(event.position());
             if (grabber != Direction::None) {
                 hit_grabber = true;
@@ -245,6 +251,8 @@ void VBForm::mousemove_event(GMouseEvent& event)
             update();
             auto delta = event.position() - m_transform_event_origin;
             for_each_selected_widget([&](auto& widget) {
+                if (widget.is_in_layout())
+                    return;
                 auto new_rect = widget.transform_origin_rect().translated(delta);
                 new_rect.set_x(new_rect.x() - (new_rect.x() % m_grid_size));
                 new_rect.set_y(new_rect.y() - (new_rect.y() % m_grid_size));
@@ -301,6 +309,8 @@ void VBForm::mousemove_event(GMouseEvent& event)
 
         update();
         for_each_selected_widget([&](auto& widget) {
+            if (widget.is_in_layout())
+                return;
             auto new_rect = widget.transform_origin_rect();
             Size minimum_size { 5, 5 };
             new_rect.set_x(new_rect.x() + change_x);
@@ -317,6 +327,8 @@ void VBForm::mousemove_event(GMouseEvent& event)
         set_cursor_type_from_grabber(m_resize_direction);
     } else {
         for (auto& widget : m_selected_widgets) {
+            if (widget->is_in_layout())
+                continue;
             auto grabber_at = widget->grabber_at(event.position());
             set_cursor_type_from_grabber(grabber_at);
             if (grabber_at != Direction::None)

DevTools/VisualBuilder/VBWidget.cpp

@@ -105,7 +105,8 @@ void VBWidget::add_property(const String& name, Function<GVariant(const GWidget&
 }
 
 #define VB_ADD_PROPERTY(gclass, name, getter, setter, variant_type)                \
-    add_property(name,                                                             \
+    add_property(                                                                  \
+        name,                                                                      \
         [](auto& widget) -> GVariant { return ((const gclass&)widget).getter(); }, \
         [](auto& widget, auto& value) { ((gclass&)widget).setter(value.to_##variant_type()); })
 
@@ -206,3 +207,12 @@ void VBWidget::capture_transform_origin_rect()
 {
     m_transform_origin_rect = rect();
 }
+
+bool VBWidget::is_in_layout() const
+{
+    if (auto* parent_widget = m_gwidget->parent_widget()) {
+        if (parent_widget->layout())
+            return true;
+    }
+    return false;
+}

DevTools/VisualBuilder/VBWidget.h

@@ -72,6 +72,8 @@ public:
     Rect transform_origin_rect() const { return m_transform_origin_rect; }
     void capture_transform_origin_rect();
 
+    bool is_in_layout() const;
+
 private:
     VBWidget(VBWidgetType, VBForm&, VBWidget* parent);