[shared] Rename classes:

ExpressionModelHandle --> ExpressionModel
SingleExpressionModelHandle --> ExpressionModelHandle
StorageFunction --> Function
StorageCartesianFunction --> CartesianFunction
StorageFunctionApp --> FunctionApp

apps/shared/function_app.cpp

@@ -0,0 +1,52 @@
+#include "function_app.h"
+#include "../apps_container.h"
+
+using namespace Poincare;
+
+namespace Shared {
+
+FunctionApp::Snapshot::Snapshot() :
+  m_cursor(),
+  m_interval(),
+  m_indexFunctionSelectedByCursor(0),
+  m_modelVersion(0),
+  m_rangeVersion(0),
+  m_angleUnitVersion(Preferences::AngleUnit::Radian)
+{
+  m_interval.setStart(0);
+  m_interval.setEnd(10);
+  m_interval.setStep(1);
+}
+
+void FunctionApp::Snapshot::reset() {
+  m_interval.setStart(0);
+  m_interval.setEnd(10);
+  m_interval.setStep(1);
+  m_indexFunctionSelectedByCursor = 0;
+  m_modelVersion = 0;
+  m_rangeVersion = 0;
+  setActiveTab(0);
+}
+
+void FunctionApp::Snapshot::storageDidChangeForRecord(const Ion::Storage::Record record) {
+  functionStore()->storageDidChangeForRecord(record);
+}
+
+void FunctionApp::willBecomeInactive() {
+  if (m_modalViewController.isDisplayingModal()) {
+    m_modalViewController.dismissModalViewController();
+  }
+  if (inputViewController()->isDisplayingModal()) {
+    inputViewController()->abortEditionAndDismiss();
+  }
+  ::App::willBecomeInactive();
+}
+
+bool FunctionApp::isAcceptableExpression(const Poincare::Expression expression) {
+  if (!TextFieldDelegateApp::ExpressionCanBeSerialized(expression, false, Expression())) {
+    return false;
+  }
+  return TextFieldDelegateApp::isAcceptableExpression(expression);
+}
+
+}