First commit of brand new rewrite

ui/viewercontainer.cpp

@@ -0,0 +1,40 @@
+#include "viewercontainer.h"
+
+#include <QWidget>
+#include <QResizeEvent>
+
+// enforces aspect ratio
+ViewerContainer::ViewerContainer(QWidget *parent) : QWidget(parent)
+{
+	child = NULL;
+	aspect_ratio = 1;
+}
+
+void ViewerContainer::adjust() {
+	if (child != NULL) {
+		QSize widget_size = size();
+		int widget_x = 0;
+		int widget_y = 0;
+		int widget_width = widget_size.width();
+		int widget_height = widget_size.height();
+		float widget_ar = (float) widget_width /(float) widget_height;
+
+		bool widget_is_larger_than_sequence = widget_ar > aspect_ratio;
+
+		if (widget_is_larger_than_sequence) {
+			widget_width = widget_height * aspect_ratio;
+			widget_x = (widget_size.width() / 2) - (widget_width / 2);
+		} else {
+			widget_height = widget_width / aspect_ratio;
+			widget_y = (widget_size.height() / 2) - (widget_height / 2);
+		}
+
+		child->move(widget_x, widget_y);
+		child->resize(widget_width, widget_height);
+	}
+}
+
+void ViewerContainer::resizeEvent(QResizeEvent *event) {
+	event->accept();
+	adjust();
+}