#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED显示器的宽度
#define SCREEN_HEIGHT 64 // OLED显示器的高度

#define OLED_RESET    -1 // 如果使用SPI接口，将OLED_RESET设置为-1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define BUTTON_UP 27 // 上按钮
#define BUTTON_DOWN 26 // 下按钮

String lists[] = {"list1","list2","list3","list4","list5","list6","list7","list8","list9","list10"};
int x=0,y=1,selected=0,selected_x=0,selected_y=0;

void setup() {
  Serial.begin(115200);

  pinMode(BUTTON_UP, INPUT_PULLUP);
  pinMode(BUTTON_DOWN, INPUT_PULLUP);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.clearDisplay();
  display.display();

  display.setTextSize(2);
}

void loop() {
  if(!digitalRead(27)){
    delay(50);
    if(selected<6){
      y-=16;
      selected++;
    }
    else if(selected>=6 && selected<9){
      selected++;
      selected_y+=16;
    }
    
  }
  else if(!digitalRead(26)){
    delay(50);
    if(selected>6 && selected<=9){
      selected--;
      selected_y-=16;
    }
    else if(selected>0){
      y+=16;
      selected--;
    }
  }
  display.clearDisplay();
  display.fillRect(selected_x,selected_y,lists[selected].length()*12+3,16,1);
  for(int i=0;i<10;i++){
    if(selected==i)
      text(x+3,y+i*16,lists[i],0);
    else
      text(x+3,y+i*16,lists[i],1);
  }
  display.display();
  delay(10);
}
void text(int x,int y,String arr,uint16_t color){
  display.setTextColor(color);
  display.setCursor(x, y);
  display.print(arr);
}