uLib/app/gcompose/src/ViewportPane.cpp

#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>
#include "PropertyWidgets.h"
#include <QSignalBlocker>

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->setObjectName("PaneTitleBar");
    m_titleBar->setFixedHeight(22);
    
    auto* titleLayout = new QHBoxLayout(m_titleBar);
    titleLayout->setContentsMargins(5, 0, 0, 0);

    m_titleLabel = new QLabel("Viewport", m_titleBar);
    m_titleLabel->setObjectName("TitleLabel");
    
    m_toggleBtn = new QPushButton("Display", m_titleBar);
    m_toggleBtn->setCheckable(true);
    m_toggleBtn->setFixedSize(60, 18);
    m_toggleBtn->setObjectName("DisplayToggleBtn");

    auto* closeBtn = new QToolButton(m_titleBar);
    closeBtn->setObjectName("PaneCloseButton");
    closeBtn->setText("X");
    closeBtn->setFixedSize(18, 18);

    titleLayout->addWidget(m_titleLabel);
    titleLayout->addStretch();
    titleLayout->addWidget(m_toggleBtn);
    titleLayout->addSpacing(5);
    titleLayout->addWidget(closeBtn);

    m_layout->addWidget(m_titleBar);

    // Main area with splitter for viewport and display panel
    m_areaSplitter = new QSplitter(Qt::Horizontal, this);
    m_areaSplitter->setObjectName("ViewportAreaSplitter");
    m_layout->addWidget(m_areaSplitter, 1);

    // Viewport will be added here via setViewport
    m_viewport = new uLib::Vtk::QViewport(m_areaSplitter);
    m_areaSplitter->addWidget(m_viewport);

    // Display Panel (Overlay/Slide-out)
    m_displayPanel = new QFrame(m_areaSplitter);
    m_displayPanel->setObjectName("DisplayPropertiesPanel");
    m_displayPanel->setMinimumWidth(150);
    m_displayPanel->hide();
    
    m_areaSplitter->addWidget(m_displayPanel);
    m_areaSplitter->setStretchFactor(0, 1);
    m_areaSplitter->setStretchFactor(1, 0);
    
    QVBoxLayout* panelLayout = new QVBoxLayout(m_displayPanel);
    panelLayout->setContentsMargins(5, 5, 5, 5);
    
    QLabel* panelHeader = new QLabel("Display Properties", m_displayPanel);
    panelHeader->setStyleSheet("font-weight: bold; padding: 5px;");
    panelLayout->addWidget(panelHeader);

    m_displayEditor = new uLib::Qt::PropertyEditor(m_displayPanel);
    panelLayout->addWidget(m_displayEditor);

    connect(m_toggleBtn, &QPushButton::toggled, this, &ViewportPane::toggleDisplayPanel);
    connect(m_titleBar, &QWidget::customContextMenuRequested, this, &ViewportPane::showContextMenu);
    connect(closeBtn, &QToolButton::clicked, this, &ViewportPane::onCloseRequested);

    m_titleBar->setContextMenuPolicy(Qt::CustomContextMenu);
}

ViewportPane::~ViewportPane() {}

void ViewportPane::toggleDisplayPanel() {
    bool visible = m_toggleBtn->isChecked();
    m_displayPanel->setVisible(visible);
    if (visible && m_areaSplitter->sizes().value(1, 0) == 0) {
        QList<int> sizes = m_areaSplitter->sizes();
        int total = sizes[0] + sizes[1];
        sizes[1] = 250;
        sizes[0] = total - 250;
        m_areaSplitter->setSizes(sizes);
    }
}

void ViewportPane::setObject(uLib::Object* obj) {
    m_displayEditor->setObject(obj, true);
    
    // Check if the object is a Prop3D (meaning it has display properties)
    bool isProp3D = (dynamic_cast<::uLib::Vtk::Prop3D*>(obj) != nullptr);
    
    // Only show the "Display" toggle button if it's a prop3d
    m_toggleBtn->setVisible(isProp3D);
    
    // If it's a prop3d, we might want to keep the panel state if it was already open,
    // or if it's NOT a prop3d, definitely hide the toggle and panel.
    if (!isProp3D) {
        m_toggleBtn->setChecked(false);
        m_displayPanel->hide();
    }
}

void ViewportPane::setViewport(QWidget* viewport, const QString& title) {
    if (m_viewport) {
        m_viewport->deleteLater();
    }
    m_viewport = viewport;
    m_titleLabel->setText(title);

    m_viewport->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    m_areaSplitter->insertWidget(0, m_viewport);
    m_areaSplitter->setStretchFactor(0, 1);
}

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 {
        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) isVtk ? addRootCanvas() : 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();
    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);
    }
}