SDK Tutorial 2

main.c

#include <pebble.h>
 
Window* g_window;
TextLayer *g_text_layer;
GBitmap *g_frame_bitmap;
BitmapLayer *g_frame_layer;
 
void window_load(Window *window)
{
  //Create and add the image
  g_frame_bitmap = gbitmap_create_with_resource(RESOURCE_ID_FRAME);
  g_frame_layer = bitmap_layer_create(GRect(7, 56, 129, 60));
  bitmap_layer_set_bitmap(g_frame_layer, g_frame_bitmap);
  layer_add_child(window_get_root_layer(window), bitmap_layer_get_layer(g_frame_layer));

  //Create the TextLayer
  g_text_layer = text_layer_create(GRect(0, 59, 144, 50));
  text_layer_set_background_color(g_text_layer, GColorClear);
  text_layer_set_text_color(g_text_layer, GColorBlack);
  
  //Improve the layout to be more like a watchface
  text_layer_set_font(g_text_layer, fonts_get_system_font(FONT_KEY_BITHAM_42_BOLD));
  text_layer_set_text_alignment(g_text_layer, GTextAlignmentCenter);
 
  layer_add_child(window_get_root_layer(window), text_layer_get_layer(g_text_layer));
}
 
void window_unload(Window *window)
{
  //We will safely destroy the Window's elements here!
  text_layer_destroy(g_text_layer);

  gbitmap_destroy(g_frame_bitmap);
  bitmap_layer_destroy(g_frame_layer);
}
 
void tick_handler(struct tm *tick_time, TimeUnits units_changed)
{
  //Allocate long-lived storage (required by TextLayer)
  static char buffer[] = "00:00";
  
  //Write the time to the buffer in a safe manner
  strftime(buffer, sizeof("00:00"), "%H:%M", tick_time);
  
  //Set the TextLayer to display the buffer
  text_layer_set_text(g_text_layer, buffer);
}
 
void init()
{
  //Create the app elements here!
  g_window = window_create();
  window_set_window_handlers(g_window, (WindowHandlers) {
    .load = window_load,
    .unload = window_unload,
  });
  
  tick_timer_service_subscribe(MINUTE_UNIT, (TickHandler)tick_handler);
 
  window_stack_push(g_window, true);
}
 
void deinit()
{
  //Destroy elements here to save memory!
  window_destroy(g_window);
}
 
int main(void)
{
  init();
  app_event_loop();
  deinit();
}