From f69dcf77de8a2fd25283b61c05f5d2b465f4967a Mon Sep 17 00:00:00 2001
From: Alex Turchyn <alex@docuseal.com>
Date: Thu, 19 Dec 2024 14:50:55 +0200
Subject: [PATCH] set field alignment from PDF form field preferences

---
 config/initializers/hexapdf.rb    |  6 ++++++
 lib/templates/find_acro_fields.rb | 12 ++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/config/initializers/hexapdf.rb b/config/initializers/hexapdf.rb
index ba1b89f5..3756f392 100644
--- a/config/initializers/hexapdf.rb
+++ b/config/initializers/hexapdf.rb
@@ -63,6 +63,12 @@ module HexaPDF
           # rubocop:enable Rails/Blank
         end
       end
+
+      class AppearanceGenerator
+        def create_push_button_appearances
+          nil
+        end
+      end
     end
 
     # comparison of Integer with HexaPDF::PDFArray failed
diff --git a/lib/templates/find_acro_fields.rb b/lib/templates/find_acro_fields.rb
index ac2d5c45..1a280a29 100644
--- a/lib/templates/find_acro_fields.rb
+++ b/lib/templates/find_acro_fields.rb
@@ -20,6 +20,11 @@ module Templates
       Selecionar  |
       Escolher
     )\b/ix
+    FIELD_ALIGNMENT = {
+      0 => 'left',
+      1 => 'center',
+      2 => 'right'
+    }.freeze
 
     module_function
 
@@ -33,6 +38,8 @@ module Templates
         areas = Array.wrap(field[:Kids] || field).filter_map do |child_field|
           page = annots_index[child_field.hash]
 
+          next unless page
+
           media_box = page[:CropBox] || page[:MediaBox]
           crop_box = page[:CropBox] || media_box
 
@@ -124,6 +131,11 @@ module Templates
                                           field[:TU] != field.full_field_name &&
                                           !field[:TU].in?(SKIP_FIELD_DESCRIPTION)
 
+      if field[:Q].present? && field.field_type == :Tx
+        attrs[:preferences] ||= {}
+        attrs[:preferences][:align] = FIELD_ALIGNMENT.fetch(field[:Q], 'left')
+      end
+
       if field.field_type == :Btn && field.concrete_field_type == :radio_button && field[:Opt].present?
         selected_option_index = (field.allowed_values || []).find_index(field.field_value)
         selected_option = field[:Opt][selected_option_index] if selected_option_index