feat: Implement feature graph and JSON document save/load

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/MainWindow.cpp

@@ -1,6 +1,12 @@
 #include "MainWindow.h"
 #include "ViewportWidget.h"
+#include "Document.h"
+#include "SketchFeature.h"
 
+#include <QMenuBar>
+#include <QMenu>
+#include <QFileDialog>
+#include <QMessageBox>
 #include <QToolBar>
 #include <QTabWidget>
 #include <QWidget>
@@ -16,6 +22,20 @@ MainWindow::MainWindow(QWidget *parent)
     setWindowTitle("OpenCAD");
     resize(1280, 720);
 
+    QMenu *fileMenu = menuBar()->addMenu("&File");
+    QAction *newAction = fileMenu->addAction("&New");
+    connect(newAction, &QAction::triggered, this, &MainWindow::newFile);
+
+    QAction *openAction = fileMenu->addAction("&Open...");
+    connect(openAction, &QAction::triggered, this, &MainWindow::open);
+
+    QAction *saveAction = fileMenu->addAction("&Save");
+    connect(saveAction, &QAction::triggered, this, &MainWindow::save);
+
+    QAction *saveAsAction = fileMenu->addAction("Save &As...");
+    connect(saveAsAction, &QAction::triggered, this, &MainWindow::saveAs);
+
+
     QToolBar* mainToolBar = addToolBar("Main Toolbar");
     mainToolBar->setMovable(false);
     mainToolBar->setFloatable(false);
@@ -58,6 +78,9 @@ MainWindow::MainWindow(QWidget *parent)
 
     m_viewport = new ViewportWidget;
     setCentralWidget(m_viewport);
+
+    m_document = new Document(this);
+    setCurrentFile(QString());
 }
 
 void MainWindow::createSketch()
@@ -69,12 +92,75 @@ void MainWindow::createSketch()
     QString item = QInputDialog::getItem(this, "Select Sketch Plane",
                                          "Plane:", items, 0, false, &ok);
     if (ok && !item.isEmpty()) {
+        auto feature = new SketchFeature("Sketch");
         if (item == "XY-Plane") {
             m_viewport->startSketch(ViewportWidget::SketchPlane::XY);
+            feature->setPlane(SketchFeature::SketchPlane::XY);
         } else if (item == "XZ-Plane") {
             m_viewport->startSketch(ViewportWidget::SketchPlane::XZ);
+            feature->setPlane(SketchFeature::SketchPlane::XZ);
         } else if (item == "YZ-Plane") {
             m_viewport->startSketch(ViewportWidget::SketchPlane::YZ);
+            feature->setPlane(SketchFeature::SketchPlane::YZ);
         }
+        m_document->addFeature(feature);
     }
 }
+
+void MainWindow::newFile()
+{
+    m_document->clear();
+    setCurrentFile(QString());
+}
+
+void MainWindow::open()
+{
+    const QString fileName = QFileDialog::getOpenFileName(this);
+    if (!fileName.isEmpty()) {
+        if (!m_document->load(fileName)) {
+            QMessageBox::warning(this, tr("OpenCAD"),
+                                 tr("Cannot read file %1").arg(QDir::toNativeSeparators(fileName)));
+            return;
+        }
+        setCurrentFile(fileName);
+    }
+}
+
+bool MainWindow::save()
+{
+    if (m_currentFile.isEmpty()) {
+        return saveAs();
+    } else {
+        if (!m_document->save(m_currentFile)) {
+            QMessageBox::warning(this, tr("OpenCAD"),
+                                 tr("Cannot write file %1").arg(QDir::toNativeSeparators(m_currentFile)));
+            return false;
+        }
+        return true;
+    }
+}
+
+bool MainWindow::saveAs()
+{
+    QFileDialog dialog(this);
+    dialog.setWindowModality(Qt::WindowModal);
+    dialog.setAcceptMode(QFileDialog::AcceptSave);
+    if (dialog.exec() != QDialog::Accepted)
+        return false;
+
+    const QString fileName = dialog.selectedFiles().first();
+    setCurrentFile(fileName);
+    return save();
+}
+
+
+void MainWindow::setCurrentFile(const QString &fileName)
+{
+    m_currentFile = fileName;
+    setWindowFilePath(m_currentFile);
+
+    QString shownName = m_currentFile;
+    if (m_currentFile.isEmpty())
+        shownName = "untitled.json";
+    setWindowTitle(tr("%1[*] - %2").arg(QFileInfo(shownName).fileName(), tr("OpenCAD")));
+}