--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/viewer/svmnode.cpp	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,147 @@
+///////////////////////////////////////////////////////////////////////
+// File:        svmnode.cpp
+// description_: ScrollView Menu Node
+// Author:      Joern Wanke
+// Created:     Thu Nov 29 2007
+//
+// (C) Copyright 2007, Google Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+///////////////////////////////////////////////////////////////////////
+//
+// A SVMenuNode is an entity which contains the mapping from a menu entry on
+// the server side to the corresponding associated commands on the client.
+// It is designed to be a tree structure with a root node, which can then be
+// used to generate the appropriate messages to the server to display the
+// menu structure there.
+// A SVMenuNode can both be used in the context_ of popup menus as well as
+// menu bars.
+
+// Include automatically generated configuration file if running autoconf.
+#ifdef HAVE_CONFIG_H
+#  include "config_auto.h"
+#endif
+
+#ifndef GRAPHICS_DISABLED
+
+#include "svmnode.h"
+
+#include <cstring>
+#include <iostream>
+
+#include "scrollview.h"
+
+namespace tesseract {
+
+// Create the empty root menu node. with just a caption. All other nodes should
+// be added to this or one of the submenus.
+SVMenuNode::SVMenuNode() {
+  cmd_event_ = -1;
+  child_ = nullptr;
+  next_ = nullptr;
+  parent_ = nullptr;
+  toggle_value_ = false;
+  is_check_box_entry_ = false;
+}
+
+SVMenuNode::~SVMenuNode() = default;
+
+// Create a new sub menu node with just a caption.  This is used to create
+// nodes which act as parent nodes to other nodes (e.g. submenus).
+SVMenuNode *SVMenuNode::AddChild(const char *txt) {
+  auto *s = new SVMenuNode(-1, txt, false, false);
+  this->AddChild(s);
+  return s;
+}
+
+// Create a "normal" menu node which is associated with a command event.
+void SVMenuNode::AddChild(const char *txt, int command_event) {
+  this->AddChild(new SVMenuNode(command_event, txt, false, false));
+}
+
+// Create a menu node with an associated value (which might be changed
+// through the gui).
+void SVMenuNode::AddChild(const char *txt, int command_event, const char *val) {
+  this->AddChild(new SVMenuNode(command_event, txt, false, false, val));
+}
+
+// Create a menu node with an associated value and description_.
+void SVMenuNode::AddChild(const char *txt, int command_event, const char *val, const char *desc) {
+  this->AddChild(new SVMenuNode(command_event, txt, false, false, val, desc));
+}
+
+// Create a flag menu node.
+void SVMenuNode::AddChild(const char *txt, int command_event, int tv) {
+  this->AddChild(new SVMenuNode(command_event, txt, tv, true));
+}
+
+// Convenience function called from the different constructors to initialize
+// the different values of the menu node.
+SVMenuNode::SVMenuNode(int command_event, const char *txt, int tv, bool check_box_entry,
+                       const char *val, const char *desc)
+    : text_(txt), value_(val), description_(desc) {
+  cmd_event_ = command_event;
+
+  child_ = nullptr;
+  next_ = nullptr;
+  parent_ = nullptr;
+  toggle_value_ = tv != 0;
+  is_check_box_entry_ = check_box_entry;
+}
+
+// Add a child node to this menu node.
+void SVMenuNode::AddChild(SVMenuNode *svmn) {
+  svmn->parent_ = this;
+  // No children yet.
+  if (child_ == nullptr) {
+    child_ = svmn;
+  } else {
+    SVMenuNode *cur = child_;
+    while (cur->next_ != nullptr) {
+      cur = cur->next_;
+    }
+    cur->next_ = svmn;
+  }
+}
+
+// Build a menu structure for the server and send the necessary messages.
+// Should be called on the root node. If menu_bar is true, a menu_bar menu
+// is built (e.g. on top of the window), if it is false a popup menu is
+// built which gets shown by right clicking on the window.
+// Deletes itself afterwards.
+void SVMenuNode::BuildMenu(ScrollView *sv, bool menu_bar) {
+  if ((parent_ != nullptr) && (menu_bar)) {
+    if (is_check_box_entry_) {
+      sv->MenuItem(parent_->text_.c_str(), text_.c_str(), cmd_event_, toggle_value_);
+    } else {
+      sv->MenuItem(parent_->text_.c_str(), text_.c_str(), cmd_event_);
+    }
+  } else if ((parent_ != nullptr) && (!menu_bar)) {
+    if (description_.length() > 0) {
+      sv->PopupItem(parent_->text_.c_str(), text_.c_str(), cmd_event_, value_.c_str(),
+                    description_.c_str());
+    } else {
+      sv->PopupItem(parent_->text_.c_str(), text_.c_str());
+    }
+  }
+  if (child_ != nullptr) {
+    child_->BuildMenu(sv, menu_bar);
+    delete child_;
+  }
+  if (next_ != nullptr) {
+    next_->BuildMenu(sv, menu_bar);
+    delete next_;
+  }
+}
+
+} // namespace tesseract
+
+#endif // !GRAPHICS_DISABLED