adafruit neopixel to add a button

Using Arduino Programming Questions
1

Hi All so i am using the following code to turn on a Neopixel strip, i want to add a 2pin momentary button. First press should turn on the strip(with the run light up effect) and the second push must turn the strip off with the same running effect down.

Any help would be appreciated

Here is my code

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
 #include <avr/power.h>
#endif

#define PIN 6
#define NUMPIXELS 30 


Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 50 // pixel on delay

void setup() {
  
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
  clock_prescale_set(clock_div_1);
#endif
  

  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
}

void loop() {
  //pixels.clear(); // Set all pixel colors to 'off'

  for(int i=0; i<NUMPIXELS; i++) { // For each pixel...
    pixels.setPixelColor(i, pixels.Color(128, 0, 128));
    pixels.show();   // Send the updated pixel colors to the hardware.
    delay(DELAYVAL); // Pause before next pass through loop
  }
}