switch button for little vGL

• switch開關回調處理函數

  
  static void swithc_event_handler(lv_obj_t* obj, lv_event_t event)
  {
      if (event == LV_EVENT_VALUE_CHANGED)
      {
          printf("state:%s\n", lv_sw_get_state(obj) ? "on" : "off");
      }
  }

• switch開關實現

  void switch_button_demo(void)
  {
      /*Create styles for the switch*/
      static lv_style_t bg_style;
      static lv_style_t indic_style;
      static lv_style_t knob_on_style;
      static lv_style_t knob_off_style;
      lv_style_copy(&bg_style, &lv_style_pretty);
      bg_style.body.radius = LV_RADIUS_CIRCLE;
      bg_style.body.padding.top = 6;
      bg_style.body.padding.bottom = 6;
      bg_style.body.main_color = LV_COLOR_RED;
      bg_style.body.grad_color = LV_COLOR_RED;
  
      lv_style_copy(&indic_style, &lv_style_pretty_color);
      indic_style.body.radius = LV_RADIUS_CIRCLE;
      indic_style.body.main_color = indic_style.body.grad_color = LV_COLOR_GREEN;
      indic_style.body.padding.left = 0;
      indic_style.body.padding.right = 0;
      indic_style.body.padding.top = 0;
      indic_style.body.padding.bottom = 0;
  
      lv_style_copy(&knob_off_style, &lv_style_pretty);
      knob_off_style.body.radius = LV_RADIUS_CIRCLE;
      knob_off_style.body.shadow.width = 4;
      knob_off_style.body.shadow.type = LV_SHADOW_BOTTOM;
      knob_off_style.body.main_color = knob_off_style.body.grad_color = LV_COLOR_BLUE;
      lv_style_copy(&knob_on_style, &lv_style_pretty_color);
      knob_on_style.body.radius = LV_RADIUS_CIRCLE;
      knob_on_style.body.shadow.width = 4;
      knob_on_style.body.shadow.type = LV_SHADOW_BOTTOM;
      knob_on_style.body.main_color = knob_on_style.body.grad_color = LV_COLOR_BLUE;
  
      /*Create a switch and apply the styles*/
      lv_obj_t *sw1 = lv_sw_create(lv_scr_act(), NULL);
      lv_sw_set_style(sw1, LV_SW_STYLE_BG, &bg_style);
      lv_sw_set_style(sw1, LV_SW_STYLE_INDIC, &indic_style);
      lv_sw_set_style(sw1, LV_SW_STYLE_KNOB_OFF, &knob_off_style);
      lv_sw_set_style(sw1, LV_SW_STYLE_KNOB_ON, &knob_on_style);
      lv_obj_set_width(sw1, 80);
      lv_obj_align(sw1, NULL, LV_ALIGN_CENTER, 0, -50);
      lv_obj_set_event_cb(sw1, swithc_event_handler);
  
  }

• 調用switch_button_demo函數，編譯運行