Make debug view scrollable

TouchGFX/gui/src/debugview_screen/DebugViewView.cpp

@@ -32,3 +32,26 @@ void DebugViewView::updateFieldValues() {
     el.updateFieldValues();
   }
 }
+
+void DebugViewView::scrollUp() {
+  if (scrollIndex == 0) {
+    updateScrollIndex(list.getNumberOfItems() - 1);
+  } else {
+    updateScrollIndex(scrollIndex - 1);
+  }
+}
+
+void DebugViewView::scrollDown() {
+  updateScrollIndex((scrollIndex + 1) % list.getNumberOfItems());
+}
+
+void DebugViewView::updateScrollIndex(size_t index) {
+  scrollIndex = index;
+  if (scrollIndex == 0) {
+    // Just animating to 0 looks very broken when scrolling forwards. Animating
+    // to numItems looks good in both directions.
+    list.animateToItem(list.getNumberOfItems(), 2);
+  } else {
+    list.animateToItem(scrollIndex, 2);
+  }
+}