Merge pull request #821 from fdlamotte/ui_gps_page

ui_task: initial gps page

src/helpers/SensorManager.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <CayenneLPP.h>
+#include "sensors/LocationProvider.h"
 
 #define TELEM_PERM_BASE         0x01   // 'base' permission includes battery
 #define TELEM_PERM_LOCATION     0x02
@@ -21,4 +22,5 @@ public:
   virtual const char* getSettingName(int i) const { return NULL; }
   virtual const char* getSettingValue(int i) const { return NULL; }
   virtual bool setSettingValue(const char* name, const char* value) { return false; }
+  virtual LocationProvider* getLocationProvider() { return NULL; }
 };

src/helpers/sensors/EnvironmentSensorManager.h

@@ -39,6 +39,7 @@ protected:
 public:
   #if ENV_INCLUDE_GPS
   EnvironmentSensorManager(LocationProvider &location): _location(&location){};
+  LocationProvider* getLocationProvider() { return _location; }
   #else
   EnvironmentSensorManager(){};
   #endif

src/helpers/sensors/LocationProvider.h

@@ -17,8 +17,8 @@ public:
     virtual bool isValid() = 0;
     virtual long getTimestamp() = 0;
     virtual void sendSentence(const char * sentence);
-    virtual void reset();
-    virtual void begin();
-    virtual void stop();
-    virtual void loop();
+    virtual void reset() = 0;
+    virtual void begin() = 0;
+    virtual void stop() = 0;
+    virtual void loop() = 0;
 };

src/helpers/ui/DisplayDriver.h

@@ -32,6 +32,15 @@ public:
     setCursor(mid_x - w/2, y);
     print(str);
   }
+  virtual void drawTextRightAlign(int x_anch, int y, const char* str) {
+    int w = getTextWidth(str);
+    setCursor(x_anch - w, y);
+    print(str);
+  }
+  virtual void drawTextLeftAlign(int x_anch, int y, const char* str) {
+    setCursor(x_anch, y);
+    print(str);
+  }
   
   // convert UTF-8 characters to displayable block characters for compatibility
   virtual void translateUTF8ToBlocks(char* dest, const char* src, size_t dest_size) {