[poincare/preferences] Added UnitFormat preference

The UnitFormat can either be Imperial (for the US) or Metric (for the
rest of the world.

Change-Id: Ic698e6732f1fa225d88a14e61751b775fe70f1ab

apps/shared/country_controller.cpp

@@ -133,7 +133,14 @@ void CountryController::viewWillAppear() {
 
 bool CountryController::handleEvent(Ion::Events::Event event) {
   if (event == Ion::Events::OK || event == Ion::Events::EXE) {
-    GlobalPreferences::sharedGlobalPreferences()->setCountry(CountryAtIndex(selectedRow()));
+    /* FIXME : Changing the unit format should perhaps be done in setCountry.*/
+    I18n::Country country = CountryAtIndex(selectedRow());
+    GlobalPreferences::sharedGlobalPreferences()->setCountry(country);
+    if (country == I18n::Country::US) {
+      Poincare::Preferences::sharedPreferences()->setUnitFormat(Poincare::Preferences::UnitFormat::Imperial);
+    } else {
+      Poincare::Preferences::sharedPreferences()->setUnitFormat(Poincare::Preferences::UnitFormat::Metric);
+    }
     return true;
   }
   return false;

poincare/include/poincare/preferences.h

@@ -36,6 +36,10 @@ public:
     Radian = 1,
     Gradian = 2
   };
+  enum class UnitFormat : uint8_t {
+    Metric = 0,
+    Imperial = 1
+  };
   Preferences();
   static Preferences * sharedPreferences();
   AngleUnit angleUnit() const { return m_angleUnit; }
@@ -46,6 +50,8 @@ public:
   void setEditionMode(EditionMode editionMode) { m_editionMode = editionMode; }
   ComplexFormat complexFormat() const { return m_complexFormat; }
   void setComplexFormat(Preferences::ComplexFormat complexFormat) { m_complexFormat = complexFormat; }
+  UnitFormat unitFormat() const { return m_unitFormat; }
+  void setUnitFormat(UnitFormat unitFormat) { m_unitFormat = unitFormat; }
   uint8_t numberOfSignificantDigits() const { return m_numberOfSignificantDigits; }
   void setNumberOfSignificantDigits(uint8_t numberOfSignificantDigits) { m_numberOfSignificantDigits = numberOfSignificantDigits; }
 private:
@@ -53,6 +59,7 @@ private:
   PrintFloatMode m_displayMode;
   EditionMode m_editionMode;
   ComplexFormat m_complexFormat;
+  UnitFormat m_unitFormat;
   uint8_t m_numberOfSignificantDigits;
 };
 

poincare/include/poincare/unit.h

@@ -210,21 +210,21 @@ public:
   static constexpr const Prefix * NoPrefix[] = {
       &EmptyPrefix
     };
-   static constexpr const Prefix * NegativeLongScalePrefixes[] = {
+  static constexpr const Prefix * NegativeLongScalePrefixes[] = {
       &PicoPrefix,
       &NanoPrefix,
       &MicroPrefix,
       &MilliPrefix,
       &EmptyPrefix,
     };
-    static constexpr const Prefix * PositiveLongScalePrefixes[] = {
+  static constexpr const Prefix * PositiveLongScalePrefixes[] = {
       &EmptyPrefix,
       &KiloPrefix,
       &MegaPrefix,
       &GigaPrefix,
       &TeraPrefix,
     };
-    static constexpr const Prefix * LongScalePrefixes[] = {
+  static constexpr const Prefix * LongScalePrefixes[] = {
       &PicoPrefix,
       &NanoPrefix,
       &MicroPrefix,
@@ -235,7 +235,7 @@ public:
       &GigaPrefix,
       &TeraPrefix,
     };
-    static constexpr const Prefix * NegativePrefixes[] = {
+  static constexpr const Prefix * NegativePrefixes[] = {
       &PicoPrefix,
       &NanoPrefix,
       &MicroPrefix,
@@ -244,7 +244,7 @@ public:
       &DeciPrefix,
       &EmptyPrefix,
     };
-    static constexpr const Prefix * AllPrefixes[] = {
+  static constexpr const Prefix * AllPrefixes[] = {
       &PicoPrefix,
       &NanoPrefix,
       &MicroPrefix,

poincare/src/unit.cpp

@@ -8,12 +8,13 @@
 #include <poincare/power.h>
 #include <poincare/rational.h>
 #include <poincare/layout_helper.h>
-#include <limits.h>
-#include <cmath>
+#include <algorithm>
 #include <assert.h>
+#include <cmath>
+#include <float.h>
+#include <limits.h>
 #include <string.h>
 #include <utility>
-#include <algorithm>
 
 namespace Poincare {