App.vue

<script>
import { ref, computed, watchEffect } from "vue";
import { useLocalStorage } from "@vueuse/core";
import {
  Connection,
  PublicKey,
  Keypair,
  clusterApiUrl,
  SystemProgram,
} from "@solana/web3.js";
import { AnchorProvider, Program } from "@project-serum/anchor";
import { WalletMultiButton, useAnchorWallet } from "../src";
import idl from "./idl.json";

const programID = new PublicKey(idl.metadata.address);
const preflightCommitment = "processed";

export default {
  components: {
    WalletMultiButton,
  },
  setup() {
    const dark = ref(false);
    const wallet = useAnchorWallet();
    const connection = new Connection(
      clusterApiUrl("devnet"),
      preflightCommitment
    );
    const provider = computed(() => {
      if (!wallet.value) return;
      return new AnchorProvider(connection, wallet.value, {
        preflightCommitment,
      });
    });
    const program = computed(() => {
      if (!provider.value) return;
      return new Program(idl, programID, provider.value);
    });

    const counterPublicKey = useLocalStorage("counterPublicKey", null);
    const counter = ref(0);
    watchEffect(async () => {
      if (!counterPublicKey.value || !program.value) return;
      const account = await program.value.account.baseAccount.fetch(
        counterPublicKey.value
      );
      counter.value = account.count.toNumber();
    });

    const createCounter = async () => {
      if (!wallet.value) {
        return alert("Connect your wallet first.");
      }

      const newCounter = Keypair.generate();
      await program.value.methods
        .create()
        .accounts({
          baseAccount: newCounter.publicKey,
          user: wallet.value.publicKey,
          systemProgram: SystemProgram.programId,
        })
        .signers([newCounter])
        .rpc();
      counterPublicKey.value = newCounter.publicKey;
    };

    const incrementCounter = async () => {
      if (!wallet.value) {
        return alert("Connect your wallet first.");
      } else if (!counterPublicKey.value) {
        return alert("Create a new counter first.");
      }

      await program.value.methods
        .increment()
        .accounts({ baseAccount: counterPublicKey.value })
        .rpc();
      counter.value += 1;
    };

    return {
      dark,
      counterPublicKey,
      counter,
      createCounter,
      incrementCounter,
    };
  },
};
</script>

<template>
  <div
    class="h-screen w-screen flex"
    :class="dark ? 'bg-gray-900 text-gray-100' : 'bg-gray-100 text-gray-700'"
  >
    <!-- Top-Right Corner. -->
    <div class="absolute top-0 right-0 p-8 flex space-x-8">
      <!-- Dark Button. -->
      <button
        @click="dark = !dark"
        class="rounded-full p-3"
        :class="
          dark
            ? 'bg-white/10 hover:bg-white/20 text-gray-200'
            : 'bg-black/10 hover:bg-black/20 text-gray-600'
        "
      >
        <svg
          v-if="dark"
          xmlns="http://www.w3.org/2000/svg"
          class="h-6 w-6"
          fill="none"
          viewBox="0 0 24 24"
          stroke="currentColor"
        >
          <path
            stroke-linecap="round"
            stroke-linejoin="round"
            stroke-width="2"
            d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z"
          />
        </svg>
        <svg
          v-else
          xmlns="http://www.w3.org/2000/svg"
          class="h-6 w-6"
          fill="none"
          viewBox="0 0 24 24"
          stroke="currentColor"
        >
          <path
            stroke-linecap="round"
            stroke-linejoin="round"
            stroke-width="2"
            d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z"
          />
        </svg>
      </button>

      <!-- Solana Wallets Vue. -->
      <wallet-multi-button :dark="dark"></wallet-multi-button>
    </div>

    <!-- Centered. -->
    <div class="m-auto w-full max-w-md p-8">
      <div
        class="shadow-xl rounded-xl"
        :class="dark ? 'bg-gray-700' : 'bg-white'"
      >
        <div class="p-8 text-center">
          <p
            class="uppercase text-xs tracking-widest text-gray-400 font-semibold"
          >
            Counter
          </p>
          <p
            class="font-bold text-5xl mt-2"
            :class="dark ? 'text-white' : 'text-gray-900'"
            v-text="counterPublicKey ? counter : 'Not Set'"
          ></p>
        </div>

        <div class="flex">
          <button
            class="flex-1 py-4 px-2 rounded-bl-xl"
            :class="dark ? 'hover:bg-gray-800' : 'hover:bg-gray-100'"
            @click="createCounter"
          >
            New Counter
          </button>
          <button
            class="flex-1 py-4 px-2 rounded-br-xl"
            :class="dark ? 'hover:bg-gray-800' : 'hover:bg-gray-100'"
            @click="incrementCounter"
          >
            Increment Counter
          </button>
        </div>
      </div>

      <div class="text-sm mt-8">
        <p class="text-xs font-semibold text-gray-400">Wallet address:</p>
        <p>{{ $wallet.publicKey.value?.toBase58() ?? "Not connected" }}</p>
        <p class="text-xs font-semibold text-gray-400 mt-4">Counter address:</p>
        <p>{{ counterPublicKey ?? "Not created" }}</p>
      </div>
    </div>
  </div>
</template>