Mostly complete from the Python original

src/window.cpp

@@ -0,0 +1,26 @@
+#include "window.h"
+#include "canvas.h"
+#include "loader.h"
+
+Window::Window(QWidget *parent) :
+    QMainWindow(parent)
+{
+    setWindowTitle("fstl");
+
+    QGLFormat format;
+    format.setVersion(2, 1);
+    format.setSampleBuffers(true);
+
+    canvas = new Canvas(format, this);
+    setCentralWidget(canvas);
+}
+
+void Window::load_stl(const QString &filename)
+{
+    Loader* loader = new Loader(this, filename);
+    connect(loader, SIGNAL(got_mesh(Mesh*)),
+            canvas, SLOT(load_mesh(Mesh*)));
+    connect(loader, SIGNAL(finished()),
+            loader, SLOT(deleteLater()));
+    loader->start();
+}