[apps] Shared: break InteractiveCurveViewController into 2 classes (to

shared the implementation of Zoom in/out and MoveCursorHorizontally)

apps/shared/simple_interactive_curve_view_controller.cpp

@@ -0,0 +1,46 @@
+#include "simple_interactive_curve_view_controller.h"
+#include <cmath>
+#include <assert.h>
+
+using namespace Poincare;
+
+namespace Shared {
+
+SimpleInteractiveCurveViewController::SimpleInteractiveCurveViewController(Responder * parentResponder,InteractiveCurveViewRange * interactiveRange, CurveView * curveView, CurveViewCursor * cursor) :
+  ViewController(parentResponder),
+  m_cursor(cursor)
+{
+}
+
+View * SimpleInteractiveCurveViewController::view() {
+  return curveView();
+}
+
+bool SimpleInteractiveCurveViewController::handleEvent(Ion::Events::Event event) {
+  if (event == Ion::Events::Plus || event == Ion::Events::Minus) {
+    return handleZoom(event);
+  }
+  if (event == Ion::Events::Left || event == Ion::Events::Right) {
+    return handleLeftRightEvent(event);
+  }
+  return false;
+}
+
+bool SimpleInteractiveCurveViewController::handleZoom(Ion::Events::Event event) {
+  float ratio = event == Ion::Events::Plus ? 2.0f/3.0f : 3.0f/2.0f;
+  interactiveCurveViewRange()->zoom(ratio, m_cursor->x(), m_cursor->y());
+  curveView()->reload();
+  return true;
+}
+
+bool SimpleInteractiveCurveViewController::handleLeftRightEvent(Ion::Events::Event event) {
+  int direction = event == Ion::Events::Left ? -1 : 1;
+  if (moveCursorHorizontally(direction)) {
+    reloadBannerView();
+    curveView()->reload();
+    return true;
+  }
+  return false;
+}
+
+}