add none button

src/Message/RichMediaMessage/Button/AbstractButton.php

@@ -8,7 +8,11 @@
 abstract class AbstractButton
 {
     /**
-     * @var string
+     * 	Text to be displayed on the button. Can contain some HTML tags.
+     * Valid and allowed HTML tags Max 250 characters.
+     * If the text is too long to display on the button it will be cropped and ended with “…”
+     *
+     * @var string|null
      */
     private $text;
 
@@ -25,12 +29,20 @@ abstract class AbstractButton
     private $bgColor;
 
     /**
-     * @param string $text
+     * @param string|null $text
      * @param string $actionBody
      * @param string|null $bgColor
      */
     public function __construct($text, $actionBody, $bgColor = null)
     {
+        if (is_string($text)) {
+            if (mb_strlen($text) > 250) {
+                throw new \InvalidArgumentException('Text must be null or string with length less then 250 chars');
+            }
+        } elseif ($text !== null) {
+            throw new \InvalidArgumentException('Text must be null or string with length less then 250 chars');
+        }
+
         $this->text = $text;
         $this->actionBody = $actionBody;
         $this->bgColor = $bgColor;

src/Message/RichMediaMessage/Button/InformativeButton.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Sokil\Viber\Notifier\Message\RichMediaMessage\Button;
+
+/**
+ * @link https://viber.github.io/docs/tools/keyboards/#replyLogic
+ */
+class InformativeButton extends AbstractButton
+{
+    public function getActionType()
+    {
+        return 'none';
+    }
+}

src/Message/RichMediaMessage/Button/OpenUrlButton.php

@@ -2,6 +2,13 @@
 
 namespace Sokil\Viber\Notifier\Message\RichMediaMessage\Button;
 
+/**
+ * @link https://viber.github.io/docs/tools/keyboards/#replyLogic
+ *
+ * The value of ActionBody is sent as a text message to account (via message event)
+ * The value of ActionBody is opened in the browser
+ * The value of ActionBody appears in the chat thread as message from the user.
+ */
 class OpenUrlButton extends AbstractButton
 {
     public function getActionType()

src/Message/RichMediaMessage/Button/ReplyButton.php

@@ -4,6 +4,9 @@
 
 /**
  * @link https://viber.github.io/docs/tools/keyboards/#replyLogic
+ *
+ * The value of ActionBody is sent as a text message to account (via message event)
+ * The value of text appears in the chat thread as message from the user.
  */
 class ReplyButton extends AbstractButton
 {

src/Message/RichMediaMessage/RichMediaMessage.php

@@ -40,8 +40,8 @@ function toApiRequestParams()
         return [
             'rich_media' => [
                 "Type" => "rich_media",
-                "ButtonsGroupColumns" => 6,
-                "ButtonsGroupRows" => count($this->buttons),
+                "ButtonsGroupColumns" => 1,
+                "ButtonsGroupRows" => 1,
                 "BgColor" => "#FFFFFF",
                 "Buttons" => array_map(
                     function(AbstractButton $button) {