use FormAPI\window\SimpleWindowForm;
use FormAPI\elements\ButtonImage;
use FormAPI\elements\Button;
use pocketmine\player\Player;

$window = new SimpleWindowForm("name", "Select game", "Choose the game");//without callback
$window = new SimpleWindowForm("name", "Select game", "Choose the game", function (Player $player, Button $selected) {
    $player->sendMessage("Hello, you select " . $selected->getText());
});//with callback

$window->addButton("name", "SkyWars");//without image
$window->addButton("name1", "BedWars", new ButtonImage("path", "textures/items/bed_blue.png"));//with image
$window->showTo($player);

use FormAPI\response\PlayerWindowResponse;
use FormAPI\window\SimpleWindowForm;

public function onResponse(PlayerWindowResponse $event){
$player = $event->getPlayer();
$form = $event->getForm();

if(!$form instanceof SimpleWindowForm) return;
if($form->getName() !== "name") return;

if($form->isClosed()) {
$player->sendMessage("The form has been closed");
return;
}

$player->sendMessage($form->getClickedButton()->getText());
}

use FormAPI\window\ModalWindowForm;
use pocketmine\player\Player;

$window = new ModalWindowForm("name", "A little question", "The plugin is good?", "Yes", "No, sorry");//without callback
$window = new ModalWindowForm("name", "A little question", "The plugin is good?", "Yes", "No, sorry", function (Player $player, bool $accept) {
    if ($accept) {
        $player->sendMessage("User accept");
    } else {
        $player->sendMessage("User cancel");
    }
});//with callback

$window->showTo($player);

use FormAPI\response\PlayerWindowResponse;
use FormAPI\window\ModalWindowForm;

public function onResponse(PlayerWindowResponse $event){
$player = $event->getPlayer();
$form = $event->getForm();

if(!$form instanceof ModalWindowForm) return;
if($form->getName() !== "name") return;

if($form->isClosed()) {
$player->sendMessage("The form has been closed");
return;
}

if($form->isAccept()) {//responsexD
$player->sendMessage("User accept");
} else {
$player->sendMessage("User cancel");
}
}

use FormAPI\window\CustomWindowForm;
use pocketmine\player\Player;

$window = new CustomWindowForm("window_test", "Test", "This is a test");//without callback
$window = new CustomWindowForm("window_test", "Test", "This is a test", function (Player $player, CustomWindowForm $form) {
    $user = $form->getElement("users");
    $password = $form->getElement("password");

    $player->sendMessage($user->getName() . ": " . $user->getFinalValue());
    $player->sendMessage($password->getName() . ": " . $password->getFinalValue());
});//with callback

$window->addDropdown("users", "Select the users", ["ClembArcade", "RomnSD"]);
$window->addInput("password", "Insert your password");
$window->addSlider("age", "Select your age", 6, 20);
$window->addToggle("notifications", "You want receive notifications?");
$window->showTo($player);

use FormAPI\response\PlayerWindowResponse;
use FormAPI\window\CustomWindowForm;

public function onResponse(PlayerWindowResponse $event){
$player = $event->getPlayer();
$form = $event->getForm();

if(!$form instanceof CustomWindowForm) return;

if($form->getName() !== "window_test") return;

if($form->isClosed()) {
$player->sendMessage("The form has been closed");
return;
}

$user = $form->getElement("users");
$password = $form->getElement("password");
$age = $form->getElement("age");
$noti = $form->getElement("notifications");

$player->sendMessage($user->getName() . ": " . $user->getFinalValue());
$player->sendMessage($password->getName() . ": " . $password->getFinalValue());
$player->sendMessage($age->getName() . ": " . $age->getFinalValue());
$player->sendMessage($noti->getName() . ": " . $noti->getFinalValue());

}