feat: add geometry spreadsheet widget

src/Gui/GeometrySpreadsheetPanel/GeometrySpreadsheetPanel.cpp

@@ -0,0 +1,43 @@
+#include "Gui/GeometrySpreadsheetPanel/GeometrySpreadsheetPanel.h"
+#include "Gui/GeometrySpreadsheetPanel/GeometrySpreadsheetMenuBar.h"
+#include <QTableWidget>
+#include <QTreeWidget>
+#include <QLabel>
+#include <qframe.h>
+#include <qtablewidget.h>
+#include <QPainterPath>
+
+GeometrySpreadsheetPanel::GeometrySpreadsheetPanel(QWidget *parent, Qt::WindowFlags f)
+: QWidget(parent, f)
+{
+    mainLayout_ = new QVBoxLayout();
+
+
+    auto *t = new QTreeView(parent);
+    t->setRootIsDecorated(false);
+    t->setAlternatingRowColors(true);
+    t->setStyleSheet(R"(
+        QTreeView {
+            background-color: #282828;
+            alternate-background-color: #242424;
+            paint-alternating-row-colors-for-empty-area: 1;
+        }
+    )");
+    t->setFrameStyle(QFrame::NoFrame);
+
+
+    mainLayout_->addWidget(new GeometrySpreadsheetMenuBar());
+    mainLayout_->addWidget(t);
+
+    setLayout(mainLayout_);
+}
+
+void GeometrySpreadsheetPanel::resizeEvent(QResizeEvent *event)
+{
+    QPainterPath path;
+    constexpr float radius = 10;
+    path.addRoundedRect(mainLayout_->contentsRect(), radius, radius);
+    QRegion region = QRegion(path.toFillPolygon().toPolygon());
+    this->setMask(region);
+}
+