gui: show maximized and always center workspace after window resize.

src/main.cpp

@@ -5,7 +5,7 @@
 int main(int argc, char *argv[]) {
 	QApplication application(argc, argv);
 	MainWindow window;
-	window.show();
+	window.showMaximized();
 
 	return application.exec();
 }

src/mainwindow.cpp

@@ -207,8 +207,6 @@ MainWindow::MainWindow(QWidget *parent)
 		const auto metric = sheet::make_metric(category);
 		get_label(*m_ui, category)->setText(QString("%1 <font color=\"gray\">(%2 mm x %3 mm)</font>").arg(name(category), QString::number(metric.w), QString::number(metric.h)));
 	}
-
-	resize(1600, 800);
 }
 
 MainWindow::~MainWindow() {

src/widgets/graphics-view.cpp

@@ -2,13 +2,21 @@
 
 GraphicsView::GraphicsView(QWidget *parent)
 		: QGraphicsView(parent) {
+	setViewportUpdateMode(QGraphicsView::ViewportUpdateMode::MinimalViewportUpdate);
 }
 
-void GraphicsView::showEvent(QShowEvent *) {
-	//setViewport(new QGLWidget(QGLFormat(QGL::SingleBuffer))); //moved to showEvent because of strange random artefacts
-	setViewportUpdateMode(QGraphicsView::ViewportUpdateMode::MinimalViewportUpdate);
-	centerOn(0.0, 0.0);
+void GraphicsView::resizeEvent(QResizeEvent *event) {
+	center();
+	QGraphicsView::resizeEvent(event);
 }
 
-void GraphicsView::wheelEvent(QWheelEvent *) {
+void GraphicsView::showEvent(QShowEvent *event) {
+	center();
+	QGraphicsView::showEvent(event);
+}
+
+void GraphicsView::wheelEvent(QWheelEvent *) {} //eat event
+
+void GraphicsView::center() {
+	centerOn(0.0, 0.0);
 }

src/widgets/graphics-view.h

@@ -7,6 +7,10 @@ class GraphicsView : public QGraphicsView {
 	GraphicsView(QWidget *parent = nullptr);
 
 protected:
+	void resizeEvent(QResizeEvent *) final;
 	void showEvent(QShowEvent *) final;
 	void wheelEvent(QWheelEvent *) final;
+
+private:
+	void center();
 };