[apps/shared][apps/calculation] Change class names:

ScrollableInputExactApproximateExpressionsCell -->
ScrollableThreeExpressionsCell
AbstractScrollableExactApproximateExpressionsView -->
AbstractScrollableMultipleExpressionsView
ScrollableExactApproximateExpressionsView -->
ScrollableTwoExpressionsView
ScrollableInputExactApproximateExpressionsView -->
ScrollableTwoExpressionsCell

apps/shared/scrollable_two_expressions_cell.cpp

@@ -0,0 +1,54 @@
+#include "scrollable_two_expressions_cell.h"
+#include <assert.h>
+using namespace Poincare;
+
+namespace Shared {
+
+ScrollableTwoExpressionsCell::ScrollableTwoExpressionsCell(Responder * parentResponder) :
+  Responder(parentResponder),
+  m_view(this)
+{
+}
+
+void ScrollableTwoExpressionsCell::setLayouts(Poincare::Layout exactLayout, Poincare::Layout approximateLayout) {
+  m_view.setLayouts(Layout(), exactLayout, approximateLayout);
+}
+
+void ScrollableTwoExpressionsCell::setHighlighted(bool highlight) {
+  m_view.evenOddCell()->setHighlighted(highlight);
+}
+
+void ScrollableTwoExpressionsCell::setEven(bool even) {
+  EvenOddCell::setEven(even);
+  m_view.setBackgroundColor(backgroundColor());
+  m_view.evenOddCell()->setEven(even);
+}
+
+void ScrollableTwoExpressionsCell::reloadScroll() {
+  m_view.reloadScroll();
+}
+
+void ScrollableTwoExpressionsCell::didBecomeFirstResponder() {
+  reinitSelection();
+  Container::activeApp()->setFirstResponder(&m_view);
+}
+
+void ScrollableTwoExpressionsCell::reinitSelection() {
+  ScrollableTwoExpressionsView::SubviewPosition selectedSubview = m_view.displayCenter() ? ScrollableTwoExpressionsView::SubviewPosition::Center : ScrollableTwoExpressionsView::SubviewPosition::Right;
+  m_view.setSelectedSubviewPosition(selectedSubview);
+  reloadScroll();
+}
+
+int ScrollableTwoExpressionsCell::numberOfSubviews() const {
+  return 1;
+}
+
+View * ScrollableTwoExpressionsCell::subviewAtIndex(int index) {
+  return &m_view;
+}
+
+void ScrollableTwoExpressionsCell::layoutSubviews(bool force) {
+  m_view.setFrame(bounds(), force);
+}
+
+}