src/Gui/BreadcrumbToolBar.cpp

@@ -26,6 +26,7 @@
 #include "EditingContext.h"
 
 #include <QColor>
+#include <QHBoxLayout>
 #include <QLabel>
 #include <QToolButton>
 
@@ -40,7 +41,6 @@ using namespace Gui;
 
 static QString chipStyle(const QString& bgHex)
 {
-    // Darken background slightly for contrast, use white text
     QColor bg(bgHex);
     QColor textColor(QStringLiteral("#cdd6f4"));  // Catppuccin Text
 
@@ -81,24 +81,25 @@ static QString separatorStyle()
 // ---------------------------------------------------------------------------
 
 BreadcrumbToolBar::BreadcrumbToolBar(QWidget* parent)
-    : QToolBar(parent)
+    : QFrame(parent)
 {
     setObjectName(QStringLiteral("BreadcrumbToolBar"));
-    setWindowTitle(tr("Editing Context"));
-    setMovable(false);
-    setFloatable(false);
-    setIconSize(QSize(16, 16));
 
-    // Thin toolbar with minimal margins
+    _layout = new QHBoxLayout(this);
+    _layout->setContentsMargins(6, 4, 6, 4);
+    _layout->setSpacing(2);
+
+    // Semi-transparent overlay background
     setStyleSheet(QStringLiteral(
-        "QToolBar {"
-        "  background: #1e1e2e;"  // Catppuccin Base
-        "  border: none;"
-        "  spacing: 2px;"
-        "  padding: 2px 4px;"
-        "  max-height: 24px;"
+        "QFrame#BreadcrumbToolBar {"
+        "  background-color: rgba(30, 30, 46, 200);"  // Catppuccin Base, ~78% opacity
+        "  border: 1px solid rgba(69, 71, 90, 150);"  // Surface1
+        "  border-radius: 6px;"
         "}"
     ));
+
+    setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
+    setFixedHeight(28);
 }
 
 
@@ -110,6 +111,7 @@ void BreadcrumbToolBar::updateContext(const EditingContext& ctx)
 {
     clearSegments();
     buildSegments(ctx);
+    adjustSize();
 }
 
 
@@ -120,17 +122,16 @@ void BreadcrumbToolBar::updateContext(const EditingContext& ctx)
 void BreadcrumbToolBar::clearSegments()
 {
     for (auto* btn : _segments) {
-        removeAction(btn->defaultAction());
+        _layout->removeWidget(btn);
         delete btn;
     }
     _segments.clear();
 
     for (auto* sep : _separators) {
+        _layout->removeWidget(sep);
         delete sep;
     }
     _separators.clear();
-
-    clear();
 }
 
 void BreadcrumbToolBar::buildSegments(const EditingContext& ctx)
@@ -144,7 +145,7 @@ void BreadcrumbToolBar::buildSegments(const EditingContext& ctx)
         if (i > 0) {
             auto* sep = new QLabel(QStringLiteral("\u203A"));  // › character
             sep->setStyleSheet(separatorStyle());
-            addWidget(sep);
+            _layout->addWidget(sep);
             _separators.append(sep);
         }
 
@@ -168,7 +169,7 @@ void BreadcrumbToolBar::buildSegments(const EditingContext& ctx)
             segmentClicked(segmentIndex);
         });
 
-        addWidget(btn);
+        _layout->addWidget(btn);
         _segments.append(btn);
     }
 }

src/Gui/BreadcrumbToolBar.h

@@ -25,10 +25,11 @@
 #ifndef GUI_BREADCRUMBTOOLBAR_H
 #define GUI_BREADCRUMBTOOLBAR_H
 
-#include <QToolBar>
+#include <QFrame>
 #include <QList>
 #include <FCGlobal.h>
 
+class QHBoxLayout;
 class QToolButton;
 class QLabel;
 
@@ -38,11 +39,14 @@ namespace Gui
 struct EditingContext;
 
 /**
- * A thin toolbar that displays the current editing context as color-coded
- * breadcrumb segments.  Each segment is a clickable QToolButton; clicking
- * a parent segment navigates up (exits the current edit, etc.).
+ * A small overlay widget that displays the current editing context as
+ * color-coded breadcrumb segments.  Each segment is a clickable QToolButton;
+ * clicking a parent segment navigates up (exits the current edit, etc.).
+ *
+ * Intended to be parented to the 3D viewport widget so it floats at the
+ * top-left corner of the view.
  */
-class GuiExport BreadcrumbToolBar: public QToolBar
+class GuiExport BreadcrumbToolBar: public QFrame
 {
     Q_OBJECT
 
@@ -59,6 +63,7 @@ private:
     void clearSegments();
     void buildSegments(const EditingContext& ctx);
 
+    QHBoxLayout* _layout;
     QList<QToolButton*> _segments;
     QList<QLabel*> _separators;
 };

src/Gui/MainWindow.cpp

@@ -105,8 +105,7 @@
 #include "SelectionView.h"
 #include "SplashScreen.h"
 #include "StatusBarLabel.h"
-#include "BreadcrumbToolBar.h"
-#include "EditingContext.h"
+
 #include "ToolBarManager.h"
 #include "ToolBoxManager.h"
 #include "Tree.h"
@@ -307,7 +306,6 @@ struct MainWindowP
     QLabel* actionLabel;
     InputHintWidget* hintLabel;
     QLabel* rightSideLabel;
-    BreadcrumbToolBar* breadcrumbBar = nullptr;
     QTimer* actionTimer;
     QTimer* statusTimer;
     QTimer* activityTimer;
@@ -492,20 +490,6 @@ MainWindow::MainWindow(QWidget* parent, Qt::WindowFlags f)
 #endif
     connect(d->mdiArea, &QMdiArea::subWindowActivated, this, &MainWindow::onWindowActivated);
 
-    // Breadcrumb toolbar for editing context display
-    d->breadcrumbBar = new BreadcrumbToolBar(this);
-    addToolBar(Qt::TopToolBarArea, d->breadcrumbBar);
-    insertToolBarBreak(d->breadcrumbBar);
-
-    // Initialize the editing context resolver and connect to breadcrumb
-    auto* ctxResolver = EditingContextResolver::instance();
-    connect(
-        ctxResolver,
-        &EditingContextResolver::contextChanged,
-        d->breadcrumbBar,
-        &BreadcrumbToolBar::updateContext
-    );
-
     setupDockWindows();
 
     // accept drops on the window, get handled in dropEvent, dragEnterEvent

src/Gui/View3DInventor.cpp

@@ -60,7 +60,9 @@
 #include "View3DInventor.h"
 #include "View3DSettings.h"
 #include "Application.h"
+#include "BreadcrumbToolBar.h"
 #include "BitmapFactory.h"
+#include "EditingContext.h"
 #include "Camera.h"
 #include "Document.h"
 #include "FileDialog.h"
@@ -145,6 +147,19 @@ View3DInventor::View3DInventor(
     // apply the user settings
     applySettings();
 
+    // Breadcrumb overlay at top-left of viewport
+    _breadcrumb = new BreadcrumbToolBar(_viewer->getWidget());
+    _breadcrumb->move(8, 8);
+    _breadcrumb->raise();
+    _breadcrumb->show();
+    _viewer->getWidget()->installEventFilter(this);
+
+    auto* ctxResolver = EditingContextResolver::instance();
+    connect(ctxResolver, &EditingContextResolver::contextChanged,
+            _breadcrumb, &BreadcrumbToolBar::updateContext);
+    // Apply the current context immediately
+    _breadcrumb->updateContext(ctxResolver->currentContext());
+
     stopSpinTimer = new QTimer(this);
     connect(stopSpinTimer, &QTimer::timeout, this, &View3DInventor::stopAnimating);
 
@@ -935,6 +950,17 @@ void View3DInventor::contextMenuEvent(QContextMenuEvent* e)
     MDIView::contextMenuEvent(e);
 }
 
+bool View3DInventor::eventFilter(QObject* obj, QEvent* ev)
+{
+    if (obj == _viewer->getWidget() && ev->type() == QEvent::Resize) {
+        // Keep breadcrumb at top-left after viewport resize
+        if (_breadcrumb) {
+            _breadcrumb->raise();
+        }
+    }
+    return MDIView::eventFilter(obj, ev);
+}
+
 void View3DInventor::customEvent(QEvent* e)
 {
     if (e->type() == QEvent::User) {

src/Gui/View3DInventor.h

@@ -40,6 +40,7 @@ class QStackedWidget;
 namespace Gui
 {
 
+class BreadcrumbToolBar;
 class Document;
 class View3DInventorViewer;
 class View3DPy;
@@ -155,11 +156,13 @@ protected:
     void keyPressEvent(QKeyEvent* e) override;
     void keyReleaseEvent(QKeyEvent* e) override;
     void focusInEvent(QFocusEvent* e) override;
+    bool eventFilter(QObject* obj, QEvent* ev) override;
     void customEvent(QEvent* e) override;
     void contextMenuEvent(QContextMenuEvent* e) override;
 
 private:
     View3DInventorViewer* _viewer;
+    BreadcrumbToolBar* _breadcrumb;
     PyObject* _viewerPy;
     QTimer* stopSpinTimer;
     QStackedWidget* stack;