Pagination Utils - JDA Pagination made easier!

With this library you will be using pages, categories and buttons in your bot in no time!

What is a page/category/button?

Have you been using a bot and came across one of those GIFs and thought: "That must've been hard to make." or "I'd like one of those in my bot!"? Fear no more, Pagination Utils to the rescue!

How do I paginate?

Before we start the fun stuff, there are a few things we need to check:

• You're using Java JDK 9 or above.
• Your bot has the following permissions:
  • MESSAGE_READ/WRITE
  • VIEW_CHANNEL
  • If using reactions:
    • MESSAGE_ADD_REACTION
    • MESSAGE_EXT_EMOJI
• If using JDABuilder.createLight(), you added the following gateway intents:
  • GUILD_MESSAGES
  • GUILD_MESSAGE_REACTIONS

Now we can finally start, which is easier than it seems! The first step is to set a JDA/SharmManager client object as the event holder, which can be done in a single line:

JDA bot = ... // Creation of bot client

Pages.activate(PaginatorBuilder.createSimplePaginator(bot));

But if you want some customization of the library's behaviour, you can opt to use the full builder:

JDA bot = ... // Creation of bot client

Paginator paginator = PaginatorBuilder.createPaginator(bot)
// Whether reactions will be removed on click
	.shouldRemoveOnReaction(false)
        // Prevents double-click on buttons and guarantee an event will only happen when previous processing has finished
        .shouldEventLock(true)
        // Whether to delete the message when the event ends (such as pressing CANCEL or timeout)
        .shouldDeleteOnCancel(true)
        // Finish configuration and activate the library
        .activate();

If you want to go even further and change the default buttons' emotes, don't worry, we got you covered:

JDA bot = ... // Creation of bot client

Paginator paginator = PaginatorBuilder.createPaginator(bot)
        // Whether reactions will be removed on click
        .shouldRemoveOnReaction(false)
        // Prevents double-click on buttons and guarantee an event will only happen when previous processing has finished
        .shouldEventLock(true)
        // Whether to delete the message when the event ends (such as pressing CANCEL or timeout)
        .shouldDeleteOnCancel(true)
        // Changes the next button to 😙
        .setEmote(Emote.NEXT, Emoji.fromFormatted("😙"))
        // Changes the previous button to 😩
        .setEmote(Emote.PREVIOUS, Emoji.fromFormatted("😩"))
        // Finish configuration and activate the library
        .activate();

Then all you need to do is create a Page (or InteractPage for interaction buttons) collection containing the type of the content and the Message/MessageEmbed object that you just created.

Example:

// Example using MessageBuilder
MessageBuilder mb = new MessageBuilder();
mb.setContent("Hello World!");

Page messagePage = Page.of(mb.build());

// Example using EmbedBuilder
EmbedBuilder eb = new EmbedBuilder()
        .setTitle("Example Embed")
        .setDescription("Hello World");

Page embedPage = InteractPage.of(eb.build());

That said, you might want to create a List of pages to use the pagination, since a single page does not need to be paginated at all:

List<Page> pages = new ArrayList<>();

// Adding 10 pages to the list
for (int i = 0; i < 10; i++) {
        pages.add(InteractPage.of("This is entry Nº " + (i + 1)));
}

Then all you have to do is call Pages.paginate() method:

exampleChannel.sendMessage((Message) pages.get(0).getContent()).queue(success -> {
	Pages.paginate(success, pages, /* Use buttons? */ true);
});

Wait, that's it?

That's everything you have to do, the library will automatically add the navigation buttons to the target message, which will change its content based on the list's order.

How do I categorize?

To categorize it's almost the same process as paginating, however, the type of collection is HashMap instead of ArrayList:

Map<Emoji, Page> categories = new HashMap<>();

// Manually adding 3 categories to the map, you could use some kind of loop to fill it (see https://emojipedia.org/ for unicodes)
mb.setContent("This is category 1");
categories.put(Emoji.fromFormatted("\u26f3"), InteractPage.of("This is category 1"));

mb.setContent("This is category 2");
categories.put(Emoji.fromFormatted("\u26bd"), InteractPage.of("This is category 2"));

mb.setContent("This is category 3");
categories.put(Emoji.fromFormatted("\u270f"), InteractPage.of("This is category 3"));

Then just call Pages.categorize() method just like you did before:

exampleChannel.sendMessage("This is the main menu").queue(success -> {
	Pages.categorize(success, categories, /* Use buttons? */ true);
});

Of course you could be more elaborate.

How do I buttonize?

To do it, you first need to setup a few things:

// A Consumer is a callback function that uses one arguments and returns nothing
// Here, wrapper is a class containing useful data related to the click event
ThrowingConsumer<ButtonWrapper> customFunction = (wrapper) -> {
	// Example of giving a role to anyone who presses this button
	guild.addRoleToMember(wrapper.getMember(), guild.getRoleById("123456789")).queue();
};

exampleChannel.sendMessage("Click to get role").queue(success -> {
	Pages.buttonize(success, Collections.singletonMap(Emoji.fromFormatted("✅"), customFunction), /* Use buttons? */ true, /* Show cancel? */ false);
});

Useful for self-assigned roles.

I have low memory, what about me?

Yet again, don't worry, Pagination Utils to the rescue!

// Could be anything, this is just an example.
List<String> data = new ArrayList<>();
// Adding 10 values pages to the list
for (int i = 0; i < 2; i++) {
	data.add("This is page number " + (i + 1));
}

ThrowingFunction<Integer, Page> func = i -> {
	return InteractPage.of(data.get(i));
};

Then just call Pages.lazyPaginate() method:

// You can disable page caching, which will prevent the library from saving previously visited pages
exampleChannel.sendMessage((String) pages.get(0).getContent()).queue(success -> {
	Pages.lazyPaginate(success, func, /* Use buttons? */ true, /* Cache? */ false);
});

Same image because...well...both are paginators

Is it really that easy?

Yes, you can focus on creating epic menus, ranking, lists, games, et cetera and leave the boring part for the library to do its job, isn't that awesome?

How do I get it?

This library is available for manual installation and through Maven Central:

To install manually

• Click on the releases tab on the top of this repository
• Download the latest release
• Put the .jar file somewhere in your project
• Add it to the buildpath
• Done!

To install via Maven Central

• Add this library as a dependency:

Gradle:

dependencies {
    implementation group: 'com.github.ygimenez', name: 'Pagination-Utils', version: 'VERSION'
}

Maven:

<dependency>
  <groupId>com.github.ygimenez</groupId>
  <artifactId>Pagination-Utils</artifactId>
  <version>VERSION</version>
</dependency>

• Replace VERSION with the one shown here (without "v"):
• Done!

Feedback

If you have any issues using this library feel free to create a new issue, I'll review it as soon as possible!