feat: Implement floating feature browser in viewport with transparent background

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

src/Document.cpp

@@ -3,6 +3,7 @@
 #include "SketchFeature.h"
 
 #include <QFile>
+#include <QFileInfo>
 #include <QJsonDocument>
 #include <QJsonArray>
 #include <QJsonObject>
@@ -26,9 +27,28 @@ void Document::clear()
 {
     qDeleteAll(m_features);
     m_features.clear();
+    m_fileName.clear();
     emit cleared();
 }
 
+const QList<Feature*>& Document::features() const
+{
+    return m_features;
+}
+
+void Document::setFileName(const QString& fileName)
+{
+    m_fileName = fileName;
+}
+
+QString Document::fileName() const
+{
+    if (m_fileName.isEmpty()) {
+        return "Untitled";
+    }
+    return QFileInfo(m_fileName).fileName();
+}
+
 bool Document::save(const QString& path) const
 {
     QJsonArray featuresArray;

src/Document.h

@@ -19,12 +19,17 @@ public:
     bool save(const QString& path) const;
     bool load(const QString& path);
 
+    const QList<Feature*>& features() const;
+    void setFileName(const QString& fileName);
+    QString fileName() const;
+
 signals:
     void featureAdded(Feature* feature);
     void cleared();
 
 private:
     QList<Feature*> m_features;
+    QString m_fileName;
 };
 
 #endif // DOCUMENT_H

src/MainWindow.cpp

@@ -8,9 +8,6 @@
 #include <QMenu>
 #include <QFileDialog>
 #include <QMessageBox>
-#include <QDockWidget>
-#include <QTreeWidget>
-#include <QTreeWidgetItem>
 #include <QToolBar>
 #include <QTabWidget>
 #include <QWidget>
@@ -84,17 +81,9 @@ MainWindow::MainWindow(QWidget *parent)
     setCentralWidget(m_viewport);
 
     m_document = new Document(this);
-    connect(m_document, &Document::featureAdded, this, &MainWindow::onFeatureAdded);
-    connect(m_document, &Document::cleared, this, &MainWindow::onDocumentCleared);
-
-    QDockWidget *dock = new QDockWidget("Browser", this);
-    addDockWidget(Qt::LeftDockWidgetArea, dock);
-
-    m_featureTree = new QTreeWidget(dock);
-    m_featureTree->setHeaderHidden(true);
-    dock->setWidget(m_featureTree);
-
-    m_rootItem = new QTreeWidgetItem(m_featureTree);
+    m_viewport->setDocument(m_document);
+    connect(m_document, &Document::featureAdded, m_viewport, QOverload<>::of(&QWidget::update));
+    connect(m_document, &Document::cleared, m_viewport, QOverload<>::of(&QWidget::update));
 
     setCurrentFile(QString());
 }
@@ -173,26 +162,11 @@ bool MainWindow::saveAs()
 void MainWindow::setCurrentFile(const QString &fileName)
 {
     m_currentFile = fileName;
+    m_document->setFileName(fileName);
     setWindowFilePath(m_currentFile);
 
     QString shownName = m_currentFile;
     if (m_currentFile.isEmpty())
         shownName = "Untitled";
     setWindowTitle(tr("%1[*] - %2").arg(QFileInfo(shownName).fileName(), tr("OpenCAD")));
-
-    if (m_rootItem) {
-        m_rootItem->setText(0, QFileInfo(shownName).fileName());
-    }
-}
-
-void MainWindow::onFeatureAdded(Feature* feature)
-{
-    QTreeWidgetItem *item = new QTreeWidgetItem(m_rootItem);
-    item->setText(0, feature->name());
-    m_rootItem->setExpanded(true);
-}
-
-void MainWindow::onDocumentCleared()
-{
-    qDeleteAll(m_rootItem->takeChildren());
 }

src/MainWindow.h

@@ -6,8 +6,6 @@
 class ViewportWidget;
 class Document;
 class Feature;
-class QTreeWidget;
-class QTreeWidgetItem;
 
 class MainWindow : public QMainWindow
 {
@@ -23,18 +21,12 @@ private slots:
     bool saveAs();
     void createSketch();
 
-    void onFeatureAdded(Feature* feature);
-    void onDocumentCleared();
-
 private:
     void setCurrentFile(const QString &fileName);
 
     ViewportWidget *m_viewport;
     Document *m_document;
     QString m_currentFile;
-
-    QTreeWidget* m_featureTree;
-    QTreeWidgetItem* m_rootItem;
 };
 
 #endif // MAINWINDOW_H

src/ViewportWidget.cpp

@@ -1,6 +1,9 @@
 #include "ViewportWidget.h"
 #include "ViewCube.h"
 #include "SketchGrid.h"
+#include "Document.h"
+#include "Feature.h"
+#include <algorithm>
 #include <QMouseEvent>
 #include <QWheelEvent>
 #include <QApplication>
@@ -21,6 +24,11 @@ ViewportWidget::~ViewportWidget()
     delete m_sketchGrid;
 }
 
+void ViewportWidget::setDocument(Document* document)
+{
+    m_document = document;
+}
+
 void ViewportWidget::initializeGL()
 {
     initializeOpenGLFunctions();
@@ -61,11 +69,12 @@ void ViewportWidget::paintGL()
 
     glViewport(0, 0, width(), height());
 
-    if (m_currentPlane != SketchPlane::NONE) {
     QPainter painter(this);
+    if (m_currentPlane != SketchPlane::NONE) {
         drawAxisLabels(painter, model, projection);
-        painter.end();
     }
+    drawFeatureBrowser(painter);
+    painter.end();
 }
 
 void ViewportWidget::resizeGL(int w, int h)
@@ -181,3 +190,50 @@ void ViewportWidget::drawAxisLabels(QPainter& painter, const QMatrix4x4& modelVi
         drawLabelsForAxis(2); // Z
     }
 }
+
+void ViewportWidget::drawFeatureBrowser(QPainter& painter)
+{
+    if (!m_document) {
+        return;
+    }
+
+    painter.setRenderHint(QPainter::Antialiasing);
+    painter.setFont(QFont("Arial", 10));
+
+    const int padding = 5;
+    const int margin = 10;
+    int x = margin;
+    int y = height() - margin;
+    int lineHeight = painter.fontMetrics().height();
+    const QList<Feature*>& features = m_document->features();
+    QString docName = m_document->fileName();
+
+    int maxWidth = painter.fontMetrics().horizontalAdvance(docName);
+
+    for (const Feature* feature : features) {
+        maxWidth = std::max(maxWidth, painter.fontMetrics().horizontalAdvance("  " + feature->name()));
+    }
+
+    int boxWidth = maxWidth + 2 * padding;
+    int boxHeight = (features.size() + 1) * lineHeight + 2 * padding;
+
+    y -= boxHeight; // Adjust y to be the top of the box
+
+    // Draw transparent background
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(QColor(50, 50, 50, 150));
+    painter.drawRoundedRect(x, y, boxWidth, boxHeight, 3, 3);
+
+    // Draw text
+    painter.setPen(Qt::white);
+    int currentY = y + padding + lineHeight;
+    int textX = x + padding;
+
+    painter.drawText(textX, currentY, docName);
+    currentY += lineHeight;
+
+    for (const Feature* feature : features) {
+        painter.drawText(textX + 10, currentY, feature->name());
+        currentY += lineHeight;
+    }
+}

src/ViewportWidget.h

@@ -10,6 +10,8 @@
 
 class ViewCube;
 class SketchGrid;
+class Document;
+class Feature;
 
 class ViewportWidget : public QOpenGLWidget, protected QOpenGLFunctions
 {
@@ -27,6 +29,7 @@ public:
     ~ViewportWidget();
 
     void startSketch(SketchPlane plane);
+    void setDocument(Document* document);
 
 protected:
     void initializeGL() override;
@@ -40,10 +43,12 @@ protected:
 private:
     QVector3D project(const QVector3D& worldCoord, const QMatrix4x4& modelView, const QMatrix4x4& projection, const QRect& viewport);
     void drawAxisLabels(QPainter& painter, const QMatrix4x4& modelView, const QMatrix4x4& projection);
+    void drawFeatureBrowser(QPainter& painter);
 
     QMatrix4x4 projection;
     ViewCube* m_viewCube;
     SketchGrid* m_sketchGrid = nullptr;
+    Document* m_document = nullptr;
     SketchPlane m_currentPlane = SketchPlane::NONE;
 
     float xRot = 0;