fix name in gcompose

app/gcompose/src/MainPanel.cpp

@@ -1,5 +1,5 @@
 #include "MainPanel.h"
-#include "QViewportPane.h"
+#include "ViewportPane.h"
 #include <QVBoxLayout>
 #include <QHBoxLayout>
 #include <QSplitter>
@@ -40,7 +40,7 @@ MainPanel::MainPanel(QWidget* parent) : QWidget(parent) {
 
     // 2. Central Splitter Area
     m_rootSplitter = new QSplitter(Qt::Horizontal, this);
-    m_firstPane = new QViewportPane(m_rootSplitter);
+    m_firstPane = new ViewportPane(m_rootSplitter);
     m_rootSplitter->addWidget(m_firstPane);
 
     mainLayout->addWidget(m_rootSplitter, 1);

app/gcompose/src/MainPanel.h

@@ -4,7 +4,7 @@
 #include <QWidget>
 
 class QSplitter;
-class QViewportPane;
+class ViewportPane;
 
 class MainPanel : public QWidget {
     Q_OBJECT
@@ -12,11 +12,11 @@ public:
     explicit MainPanel(QWidget* parent = nullptr);
     virtual ~MainPanel();
 
-    QViewportPane* getFirstPane() const { return m_firstPane; }
+    ViewportPane* getFirstPane() const { return m_firstPane; }
 
 private:
     QSplitter* m_rootSplitter;
-    QViewportPane* m_firstPane;
+    ViewportPane* m_firstPane;
 };
 
 #endif // MAINPANEL_H

app/gcompose/src/MainWindow.h

@@ -5,6 +5,7 @@
 #include <QVTKOpenGLNativeWidget.h>
 
 class MainPanel;
+class ViewportPane;
 
 namespace uLib {
 namespace Vtk {

app/gcompose/src/ViewportPane.cpp

@@ -0,0 +1,169 @@
+#include "ViewportPane.h"
+#include <Vtk/vtkQViewport.h>
+#include <Root/QCanvas.h>
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QToolButton>
+#include <QMenu>
+#include <QAction>
+#include <QSplitter>
+#include <vtkCamera.h>
+
+ViewportPane::ViewportPane(QWidget* parent) : QWidget(parent), m_viewport(nullptr) {
+    m_layout = new QVBoxLayout(this);
+    m_layout->setContentsMargins(0, 0, 0, 0);
+    m_layout->setSpacing(0);
+
+    // Title bar setup
+    m_titleBar = new QWidget(this);
+    m_titleBar->setFixedHeight(22);
+    m_titleBar->setStyleSheet("background-color: #333; color: white;");
+    
+    auto* titleLayout = new QHBoxLayout(m_titleBar);
+    titleLayout->setContentsMargins(5, 0, 5, 0);
+
+    m_titleLabel = new QLabel("Viewport", m_titleBar);
+    
+    auto* closeBtn = new QToolButton(m_titleBar);
+    closeBtn->setText("X");
+    closeBtn->setFixedSize(18, 18);
+    closeBtn->setStyleSheet("QToolButton { border: none; font-weight: bold; background: transparent; color: #ccc; } "
+                            "QToolButton:hover { color: white; background: red; }");
+
+    titleLayout->addWidget(m_titleLabel);
+    titleLayout->addStretch();
+    titleLayout->addWidget(closeBtn);
+
+    m_layout->addWidget(m_titleBar);
+
+    m_titleBar->setContextMenuPolicy(Qt::CustomContextMenu);
+    connect(m_titleBar, &QWidget::customContextMenuRequested, this, &ViewportPane::showContextMenu);
+    connect(closeBtn, &QToolButton::clicked, this, &ViewportPane::onCloseRequested);
+
+    addVtkViewport(); // Initialize with a default VTK viewport
+}
+
+ViewportPane::~ViewportPane() {}
+
+void ViewportPane::setViewport(QWidget* viewport, const QString& title) {
+    if (m_viewport) {
+        m_layout->removeWidget(m_viewport);
+        delete m_viewport;
+    }
+    m_viewport = viewport;
+    m_titleLabel->setText(title);
+
+    m_viewport->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+    m_layout->addWidget(m_viewport);
+}
+
+void ViewportPane::addVtkViewport() {
+    auto* viewport = new uLib::Vtk::QViewport(this);
+    setViewport(viewport, "VTK Viewport");
+}
+
+void ViewportPane::addRootCanvas() {
+    auto* canvas = new uLib::Root::QCanvas(this);
+    setViewport(canvas, "ROOT Canvas");
+}
+
+void ViewportPane::onCloseRequested() {
+    QSplitter* parentSplitter = qobject_cast<QSplitter*>(parentWidget());
+    if (parentSplitter && parentSplitter->count() > 1) {
+        deleteLater();
+    } else {
+        // Can't close the last viewport in the splitter safely. Re-initialize to default VTK canvas.
+        addVtkViewport();
+    }
+}
+
+void ViewportPane::showContextMenu(const QPoint& pos) {
+    QMenu menu(this);
+    QAction* hSplit = menu.addAction("H split");
+    QAction* vSplit = menu.addAction("V split");
+    menu.addSeparator();
+    
+    bool isVtk = (qobject_cast<uLib::Vtk::QViewport*>(m_viewport) != nullptr);
+
+    QAction* changeType = menu.addAction(isVtk ? "Change to ROOT Canvas" : "Change to VTK Viewport");
+
+    QAction* selected = menu.exec(m_titleBar->mapToGlobal(pos));
+    
+    if (selected == hSplit) {
+        AttemptSplit(Qt::Horizontal);
+    } else if (selected == vSplit) {
+        AttemptSplit(Qt::Vertical);
+    } else if (selected == changeType) {
+        if (isVtk) {
+            addRootCanvas();
+        } else {
+            addVtkViewport();
+        }
+    }
+}
+
+void ViewportPane::AttemptSplit(Qt::Orientation orientation) {
+    QWidget* p = parentWidget();
+    if (!p) return;
+
+    QSplitter* parentSplitter = qobject_cast<QSplitter*>(p);
+    if (!parentSplitter) return;
+
+    ViewportPane* newPane = new ViewportPane();
+
+    // 1. Synchronize viewport content and camera (VTK Viewport only for now)
+    auto* currentVtk = qobject_cast<uLib::Vtk::QViewport*>(m_viewport);
+    if (currentVtk) {
+        auto* newVtk = qobject_cast<uLib::Vtk::QViewport*>(newPane->currentViewport());
+        if (newVtk) {
+            // Copy puppets
+            for (auto* puppet : currentVtk->getPuppets()) {
+                newVtk->AddPuppet(*puppet);
+            }
+            // Copy camera
+            if (currentVtk->GetRenderer() && newVtk->GetRenderer()) {
+                vtkCamera* currentCam = currentVtk->GetRenderer()->GetActiveCamera();
+                vtkCamera* newCam = newVtk->GetRenderer()->GetActiveCamera();
+                if (currentCam && newCam) {
+                    newCam->DeepCopy(currentCam);
+                }
+            }
+            // Sync grid visible and axis
+            newVtk->SetGridVisible(currentVtk->GetGridVisible());
+            newVtk->SetGridAxis(currentVtk->GetGridAxis());
+        }
+    }
+
+    // 2. Adjust for ROOT Canvas if that was the active view
+    bool isRoot = (qobject_cast<uLib::Root::QCanvas*>(m_viewport) != nullptr);
+    if (isRoot) {
+        newPane->addRootCanvas();
+    }
+
+    if (parentSplitter->orientation() == orientation) {
+        int index = parentSplitter->indexOf(this);
+        QList<int> sizes = parentSplitter->sizes();
+        int currentSize = sizes.value(index, 0);
+        int half = currentSize / 2;
+        sizes[index] = half;
+        sizes.insert(index + 1, currentSize - half);
+        
+        parentSplitter->insertWidget(index + 1, newPane);
+        parentSplitter->setSizes(sizes);
+    } else {
+        int index = parentSplitter->indexOf(this);
+        QList<int> parentSizes = parentSplitter->sizes();
+        
+        QSplitter* newSplitter = new QSplitter(orientation);
+        newSplitter->addWidget(this);
+        newSplitter->addWidget(newPane);
+        
+        QList<int> subSizes;
+        subSizes << 500 << 500;
+        newSplitter->setSizes(subSizes);
+        
+        parentSplitter->insertWidget(index, newSplitter);
+        parentSplitter->setSizes(parentSizes);
+    }
+}

app/gcompose/src/ViewportPane.h

@@ -0,0 +1,34 @@
+#ifndef VIEWPORTPANE_H
+#define VIEWPORTPANE_H
+
+#include <QWidget>
+
+class QVBoxLayout;
+class QLabel;
+
+class ViewportPane : public QWidget {
+    Q_OBJECT
+public:
+    explicit ViewportPane(QWidget* parent = nullptr);
+    virtual ~ViewportPane();
+
+    void addVtkViewport();
+    void addRootCanvas();
+
+    QWidget* currentViewport() const { return m_viewport; }
+
+private slots:
+    void onCloseRequested();
+    void showContextMenu(const QPoint& pos);
+
+private:
+    void AttemptSplit(Qt::Orientation orientation);
+    void setViewport(QWidget* viewport, const QString& title);
+
+    QVBoxLayout* m_layout;
+    QWidget* m_titleBar;
+    QLabel* m_titleLabel;
+    QWidget* m_viewport;
+};
+
+#endif // VIEWPORTPANE_H

app/gcompose/src/main.cpp

@@ -1,7 +1,7 @@
 #include <QApplication>
 #include "MainWindow.h"
 #include "MainPanel.h"
-#include "QViewportPane.h"
+#include "ViewportPane.h"
 
 #include "Math/ContainerBox.h"
 #include <HEP/Geant/Scene.h>
@@ -38,7 +38,7 @@ int main(int argc, char** argv) {
     // 2. Initialize MainWindow (contains embedded VTK QViewport)
     MainWindow window;
     MainPanel* panel = window.getPanel();
-    QViewportPane* pane = panel->getFirstPane();
+    ViewportPane* pane = panel->getFirstPane();
     Vtk::QViewport* viewport = qobject_cast<Vtk::QViewport*>(pane->currentViewport());
 
     Vtk::vtkContainerBox vtk_box(&world_box);