glib/demo/forms.c - third_party/poppler - Git at Google

 /*
  * Copyright (C) 2007 Carlos Garcia Campos  <carlosgc@gnome.org>
  * Copyright (C) 2021 André Guerreiro <aguerreiro1985@gmail.com>
  * Copyright (C) 2021 Marek Kasik <mkasik@redhat.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2, or (at your option)
  * any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  */

 #include <gtk/gtk.h>
 #include <string.h>

 #include "forms.h"
 #include "utils.h"

 enum
 {
     FORMS_FIELD_TYPE_COLUMN,
     FORMS_ID_COLUMN,
     FORMS_READ_ONLY_COLUMN,
     FORMS_X1_COLUMN,
     FORMS_Y1_COLUMN,
     FORMS_X2_COLUMN,
     FORMS_Y2_COLUMN,
     FORMS_FIELD_COLUMN,
     N_COLUMNS
 };

 typedef struct
 {
     PopplerDocument *doc;

     GtkListStore *model;
     GtkWidget *field_view;
     GtkWidget *timer_label;

     gint page;
 } PgdFormsDemo;

 static void pgd_forms_free(PgdFormsDemo *demo)
 {
     if (!demo)
         return;

     if (demo->doc) {
         g_object_unref(demo->doc);
         demo->doc = NULL;
     }

     if (demo->model) {
         g_object_unref(demo->model);
         demo->model = NULL;
     }

     g_free(demo);
 }

 static GtkWidget *pgd_form_field_view_new(void)
 {
     GtkWidget *frame, *label;

     frame = gtk_frame_new(NULL);
     gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_NONE);
     label = gtk_label_new(NULL);
     gtk_label_set_markup(GTK_LABEL(label), "<b>Form Field Properties</b>");
     gtk_frame_set_label_widget(GTK_FRAME(frame), label);
     gtk_widget_show(label);

     return frame;
 }

 static void pgd_form_field_view_add_choice_items(GtkGrid *table, PopplerFormField *field, gint *selected, gint *row)
 {
     GtkWidget *label;
     GtkWidget *textview, *swindow;
     GtkTextBuffer *buffer;
     gint i;

     label = gtk_label_new(NULL);
     g_object_set(G_OBJECT(label), "xalign", 0.0, NULL);
     gtk_label_set_markup(GTK_LABEL(label), "<b>Items:</b>");
     gtk_grid_attach(GTK_GRID(table), label, 0, *row, 1, 1);
     gtk_widget_show(label);

     swindow = gtk_scrolled_window_new(NULL, NULL);
     gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swindow), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

     textview = gtk_text_view_new();
     gtk_text_view_set_editable(GTK_TEXT_VIEW(textview), FALSE);
     buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview));

     for (i = 0; i < poppler_form_field_choice_get_n_items(field); i++) {
         gchar *item;

         item = poppler_form_field_choice_get_item(field, i);
         gtk_text_buffer_insert_at_cursor(buffer, item, strlen(item));
         gtk_text_buffer_insert_at_cursor(buffer, "\n", strlen("\n"));
         g_free(item);

         if (poppler_form_field_choice_is_item_selected(field, i))
             *selected = i;
     }

     gtk_container_add(GTK_CONTAINER(swindow), textview);
     gtk_widget_show(textview);

     gtk_grid_attach(GTK_GRID(table), swindow, 1, *row, 1, 1);
     gtk_widget_show(swindow);

     *row += 1;
 }

 static void pgd_form_field_view_set_field(GtkWidget *field_view, PopplerFormField *field)
 {
     GtkWidget *table;
     PopplerAction *action;
     GEnumValue *enum_value;
     gchar *text;
     gint row = 0;
     PopplerSignatureInfo *psig_info;

     table = gtk_bin_get_child(GTK_BIN(field_view));
     if (table) {
         gtk_container_remove(GTK_CONTAINER(field_view), table);
     }

     if (!field)
         return;

     table = gtk_grid_new();
     gtk_widget_set_margin_top(table, 5);
     gtk_widget_set_margin_bottom(table, 5);
 #if GTK_CHECK_VERSION(3, 12, 0)
     gtk_widget_set_margin_start(table, 12);
     gtk_widget_set_margin_end(table, 5);
 #else
     gtk_widget_set_margin_left(table, 12);
     gtk_widget_set_margin_right(table, 5);
 #endif
     gtk_grid_set_column_spacing(GTK_GRID(table), 6);
     gtk_grid_set_row_spacing(GTK_GRID(table), 6);

     text = poppler_form_field_get_name(field);
     if (text) {
         pgd_table_add_property(GTK_GRID(table), "<b>Name:</b>", text, &row);
         g_free(text);
     }
     text = poppler_form_field_get_partial_name(field);
     if (text) {
         pgd_table_add_property(GTK_GRID(table), "<b>Partial Name:</b>", text, &row);
         g_free(text);
     }
     text = poppler_form_field_get_mapping_name(field);
     if (text) {
         pgd_table_add_property(GTK_GRID(table), "<b>Mapping Name:</b>", text, &row);
         g_free(text);
     }

     action = poppler_form_field_get_action(field);
     if (action) {
         GtkWidget *action_view;

         action_view = pgd_action_view_new(NULL);
         pgd_action_view_set_action(action_view, action);
         pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Action:</b>", action_view, &row);
         gtk_widget_show(action_view);
     }

     action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_FIELD_MODIFIED);
     if (action) {
         GtkWidget *action_view;

         action_view = pgd_action_view_new(NULL);
         pgd_action_view_set_action(action_view, action);
         pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Field Modified Action:</b>", action_view, &row);
         gtk_widget_show(action_view);
     }

     action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_FORMAT_FIELD);
     if (action) {
         GtkWidget *action_view;

         action_view = pgd_action_view_new(NULL);
         pgd_action_view_set_action(action_view, action);
         pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Field Format Action:</b>", action_view, &row);
         gtk_widget_show(action_view);
     }

     action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_VALIDATE_FIELD);
     if (action) {
         GtkWidget *action_view;

         action_view = pgd_action_view_new(NULL);
         pgd_action_view_set_action(action_view, action);
         pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Validate Field Action:</b>", action_view, &row);
         gtk_widget_show(action_view);
     }

     action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_CALCULATE_FIELD);
     if (action) {
         GtkWidget *action_view;

         action_view = pgd_action_view_new(NULL);
         pgd_action_view_set_action(action_view, action);
         pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Calculate Field Action:</b>", action_view, &row);
         gtk_widget_show(action_view);
     }

     switch (poppler_form_field_get_field_type(field)) {
     case POPPLER_FORM_FIELD_BUTTON:
         enum_value = g_enum_get_value((GEnumClass *)g_type_class_ref(POPPLER_TYPE_FORM_BUTTON_TYPE), poppler_form_field_button_get_button_type(field));
         pgd_table_add_property(GTK_GRID(table), "<b>Button Type:</b>", enum_value->value_name, &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Button State:</b>", poppler_form_field_button_get_state(field) ? "Active" : "Inactive", &row);
         break;
     case POPPLER_FORM_FIELD_TEXT:
         enum_value = g_enum_get_value((GEnumClass *)g_type_class_ref(POPPLER_TYPE_FORM_TEXT_TYPE), poppler_form_field_text_get_text_type(field));
         pgd_table_add_property(GTK_GRID(table), "<b>Text Type:</b>", enum_value->value_name, &row);

         text = poppler_form_field_text_get_text(field);
         pgd_table_add_property(GTK_GRID(table), "<b>Contents:</b>", text, &row);
         g_free(text);

         text = g_strdup_printf("%d", poppler_form_field_text_get_max_len(field));
         pgd_table_add_property(GTK_GRID(table), "<b>Max Length:</b>", text, &row);
         g_free(text);

         pgd_table_add_property(GTK_GRID(table), "<b>Do spellcheck:</b>", poppler_form_field_text_do_spell_check(field) ? "Yes" : "No", &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Do scroll:</b>", poppler_form_field_text_do_scroll(field) ? "Yes" : "No", &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Rich Text:</b>", poppler_form_field_text_is_rich_text(field) ? "Yes" : "No", &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Pasword type:</b>", poppler_form_field_text_is_password(field) ? "Yes" : "No", &row);
         break;
     case POPPLER_FORM_FIELD_CHOICE: {
         gchar *item;
         gint selected = -1;

         enum_value = g_enum_get_value((GEnumClass *)g_type_class_ref(POPPLER_TYPE_FORM_CHOICE_TYPE), poppler_form_field_choice_get_choice_type(field));
         pgd_table_add_property(GTK_GRID(table), "<b>Choice Type:</b>", enum_value->value_name, &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Editable:</b>", poppler_form_field_choice_is_editable(field) ? "Yes" : "No", &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Multiple Selection:</b>", poppler_form_field_choice_can_select_multiple(field) ? "Yes" : "No", &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Do spellcheck:</b>", poppler_form_field_choice_do_spell_check(field) ? "Yes" : "No", &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Commit on Change:</b>", poppler_form_field_choice_commit_on_change(field) ? "Yes" : "No", &row);

         text = g_strdup_printf("%d", poppler_form_field_choice_get_n_items(field));
         pgd_table_add_property(GTK_GRID(table), "<b>Number of items:</b>", text, &row);
         g_free(text);

         pgd_form_field_view_add_choice_items(GTK_GRID(table), field, &selected, &row);

         if (selected >= 0 && poppler_form_field_choice_get_n_items(field) > selected) {
             item = poppler_form_field_choice_get_item(field, selected);
             text = g_strdup_printf("%d (%s)", selected, item);
             g_free(item);
             pgd_table_add_property(GTK_GRID(table), "<b>Selected item:</b>", text, &row);
             g_free(text);
         }

         text = poppler_form_field_choice_get_text(field);
         pgd_table_add_property(GTK_GRID(table), "<b>Contents:</b>", text, &row);
         g_free(text);
     } break;
     case POPPLER_FORM_FIELD_SIGNATURE: {
         const gchar *signer_name;

         psig_info = poppler_form_field_signature_validate_sync(
                 field, POPPLER_SIGNATURE_VALIDATION_FLAG_VALIDATE_CERTIFICATE | POPPLER_SIGNATURE_VALIDATION_FLAG_WITHOUT_OCSP_REVOCATION_CHECK | POPPLER_SIGNATURE_VALIDATION_FLAG_USE_AIA_CERTIFICATE_FETCH, NULL, NULL);
         signer_name = poppler_signature_info_get_signer_name(psig_info);
         pgd_table_add_property(GTK_GRID(table), "<b>Signer Name:</b>", signer_name ? signer_name : "Signers name found", &row);
         text = g_date_time_format(poppler_signature_info_get_local_signing_time(psig_info), "%b %d %Y %H:%M:%S");
         pgd_table_add_property(GTK_GRID(table), "<b>Signing Time:</b>", text, &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Signature Val Status:</b>", poppler_signature_info_get_signature_status(psig_info) == POPPLER_SIGNATURE_VALID ? "Signature is Valid" : "Signature is Invalid", &row);
         pgd_table_add_property(GTK_GRID(table), "<b>Certificate Val Status:</b>", poppler_signature_info_get_certificate_status(psig_info) == POPPLER_CERTIFICATE_TRUSTED ? "Certificate is Trusted" : "Certificate cannot be Trusted", &row);

         poppler_signature_info_free(psig_info);
         g_free(text);
     } break;
     case POPPLER_FORM_FIELD_UNKNOWN:
         break;
     default:
         g_assert_not_reached();
     }

     gtk_container_add(GTK_CONTAINER(field_view), table);
     gtk_widget_show(table);
 }

 const gchar *get_form_field_type(PopplerFormField *field)
 {
     switch (poppler_form_field_get_field_type(field)) {
     case POPPLER_FORM_FIELD_TEXT:
         return "Text";
     case POPPLER_FORM_FIELD_BUTTON:
         return "Button";
     case POPPLER_FORM_FIELD_CHOICE:
         return "Choice";
     case POPPLER_FORM_FIELD_SIGNATURE:
         return "Signature";
     case POPPLER_FORM_FIELD_UNKNOWN:
     default:
         break;
     }

     return "Unknown";
 }

 static void pgd_forms_get_form_fields(GtkWidget *button, PgdFormsDemo *demo)
 {
     PopplerPage *page;
     GList *mapping, *l;
     gint n_fields;
     GTimer *timer;

     gtk_list_store_clear(demo->model);
     pgd_form_field_view_set_field(demo->field_view, NULL);

     page = poppler_document_get_page(demo->doc, demo->page);
     if (!page)
         return;

     timer = g_timer_new();
     mapping = poppler_page_get_form_field_mapping(page);
     g_timer_stop(timer);

     n_fields = g_list_length(mapping);
     if (n_fields > 0) {
         gchar *str;

         str = g_strdup_printf("<i>%d form fields found in %.4f seconds</i>", n_fields, g_timer_elapsed(timer, NULL));
         gtk_label_set_markup(GTK_LABEL(demo->timer_label), str);
         g_free(str);
     } else {
         gtk_label_set_markup(GTK_LABEL(demo->timer_label), "<i>No form fields found</i>");
     }

     g_timer_destroy(timer);

     for (l = mapping; l; l = g_list_next(l)) {
         PopplerFormFieldMapping *fmapping;
         GtkTreeIter iter;
         gchar *x1, *y1, *x2, *y2;

         fmapping = (PopplerFormFieldMapping *)l->data;

         x1 = g_strdup_printf("%.2f", fmapping->area.x1);
         y1 = g_strdup_printf("%.2f", fmapping->area.y1);
         x2 = g_strdup_printf("%.2f", fmapping->area.x2);
         y2 = g_strdup_printf("%.2f", fmapping->area.y2);

         gtk_list_store_append(demo->model, &iter);
         gtk_list_store_set(demo->model, &iter, FORMS_FIELD_TYPE_COLUMN, get_form_field_type(fmapping->field), FORMS_ID_COLUMN, poppler_form_field_get_id(fmapping->field), FORMS_READ_ONLY_COLUMN,
                            poppler_form_field_is_read_only(fmapping->field), FORMS_X1_COLUMN, x1, FORMS_Y1_COLUMN, y1, FORMS_X2_COLUMN, x2, FORMS_Y2_COLUMN, y2, FORMS_FIELD_COLUMN, fmapping->field, -1);
         g_free(x1);
         g_free(y1);
         g_free(x2);
         g_free(y2);
     }

     poppler_page_free_form_field_mapping(mapping);
     g_object_unref(page);
 }

 static void pgd_forms_page_selector_value_changed(GtkSpinButton *spinbutton, PgdFormsDemo *demo)
 {
     demo->page = (gint)gtk_spin_button_get_value(spinbutton) - 1;
 }

 static void pgd_forms_selection_changed(GtkTreeSelection *treeselection, PgdFormsDemo *demo)
 {
     GtkTreeModel *model;
     GtkTreeIter iter;

     if (gtk_tree_selection_get_selected(treeselection, &model, &iter)) {
         PopplerFormField *field;

         gtk_tree_model_get(model, &iter, FORMS_FIELD_COLUMN, &field, -1);
         pgd_form_field_view_set_field(demo->field_view, field);
         g_object_unref(field);
     }
 }

 GtkWidget *pgd_forms_create_widget(PopplerDocument *document)
 {
     PgdFormsDemo *demo;
     GtkWidget *label;
     GtkWidget *vbox;
     GtkWidget *hbox, *page_selector;
     GtkWidget *button;
     GtkWidget *hpaned;
     GtkWidget *swindow, *treeview;
     GtkTreeSelection *selection;
     GtkCellRenderer *renderer;
     gchar *str;
     gint n_pages;

     demo = g_new0(PgdFormsDemo, 1);

     demo->doc = g_object_ref(document);

     n_pages = poppler_document_get_n_pages(document);

     vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 12);

     hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 6);

     label = gtk_label_new("Page:");
     gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, TRUE, 0);
     gtk_widget_show(label);

     page_selector = gtk_spin_button_new_with_range(1, n_pages, 1);
     g_signal_connect(G_OBJECT(page_selector), "value-changed", G_CALLBACK(pgd_forms_page_selector_value_changed), (gpointer)demo);
     gtk_box_pack_start(GTK_BOX(hbox), page_selector, FALSE, TRUE, 0);
     gtk_widget_show(page_selector);

     str = g_strdup_printf("of %d", n_pages);
     label = gtk_label_new(str);
     gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, TRUE, 0);
     gtk_widget_show(label);
     g_free(str);

     button = gtk_button_new_with_label("Get Forms Fields");
     g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(pgd_forms_get_form_fields), (gpointer)demo);
     gtk_box_pack_end(GTK_BOX(hbox), button, FALSE, FALSE, 0);
     gtk_widget_show(button);

     gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, TRUE, 0);
     gtk_widget_show(hbox);

     demo->timer_label = gtk_label_new(NULL);
     gtk_label_set_markup(GTK_LABEL(demo->timer_label), "<i>No form fields found</i>");
     g_object_set(G_OBJECT(demo->timer_label), "xalign", 1.0, NULL);
     gtk_box_pack_start(GTK_BOX(vbox), demo->timer_label, FALSE, TRUE, 0);
     gtk_widget_show(demo->timer_label);

     hpaned = gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);

     demo->field_view = pgd_form_field_view_new();

     swindow = gtk_scrolled_window_new(NULL, NULL);
     gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swindow), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

     demo->model = gtk_list_store_new(N_COLUMNS, G_TYPE_STRING, G_TYPE_INT, G_TYPE_BOOLEAN, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_OBJECT);
     treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(demo->model));

     renderer = gtk_cell_renderer_text_new();
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 0, "Form Field Type", renderer, "text", FORMS_FIELD_TYPE_COLUMN, NULL);

     renderer = gtk_cell_renderer_text_new();
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 1, "Form Field Id", renderer, "text", FORMS_ID_COLUMN, NULL);

     renderer = gtk_cell_renderer_toggle_new();
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 2, "Read Only", renderer, "active", FORMS_READ_ONLY_COLUMN, NULL);

     renderer = gtk_cell_renderer_text_new();
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 3, "X1", renderer, "text", FORMS_X1_COLUMN, NULL);
     renderer = gtk_cell_renderer_text_new();
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 4, "Y1", renderer, "text", FORMS_Y1_COLUMN, NULL);
     renderer = gtk_cell_renderer_text_new();
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 5, "X2", renderer, "text", FORMS_X2_COLUMN, NULL);
     renderer = gtk_cell_renderer_text_new();
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 6, "Y2", renderer, "text", FORMS_Y2_COLUMN, NULL);

     selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));
     g_signal_connect(G_OBJECT(selection), "changed", G_CALLBACK(pgd_forms_selection_changed), (gpointer)demo);

     gtk_container_add(GTK_CONTAINER(swindow), treeview);
     gtk_widget_show(treeview);

     gtk_paned_add1(GTK_PANED(hpaned), swindow);
     gtk_widget_show(swindow);

     gtk_paned_add2(GTK_PANED(hpaned), demo->field_view);
     gtk_widget_show(demo->field_view);

     gtk_paned_set_position(GTK_PANED(hpaned), 300);

     gtk_box_pack_start(GTK_BOX(vbox), hpaned, TRUE, TRUE, 0);
     gtk_widget_show(hpaned);

     g_object_weak_ref(G_OBJECT(vbox), (GWeakNotify)pgd_forms_free, demo);

     return vbox;
 }
	/*
	* Copyright (C) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
	* Copyright (C) 2021 André Guerreiro <aguerreiro1985@gmail.com>
	* Copyright (C) 2021 Marek Kasik <mkasik@redhat.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2, or (at your option)
	* any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
	*/

	#include <gtk/gtk.h>
	#include <string.h>

	#include "forms.h"
	#include "utils.h"

	enum
	{
	FORMS_FIELD_TYPE_COLUMN,
	FORMS_ID_COLUMN,
	FORMS_READ_ONLY_COLUMN,
	FORMS_X1_COLUMN,
	FORMS_Y1_COLUMN,
	FORMS_X2_COLUMN,
	FORMS_Y2_COLUMN,
	FORMS_FIELD_COLUMN,
	N_COLUMNS
	};

	typedef struct
	{
	PopplerDocument *doc;

	GtkListStore *model;
	GtkWidget *field_view;
	GtkWidget *timer_label;

	gint page;
	} PgdFormsDemo;

	static void pgd_forms_free(PgdFormsDemo *demo)
	{
	if (!demo)
	return;

	if (demo->doc) {
	g_object_unref(demo->doc);
	demo->doc = NULL;
	}

	if (demo->model) {
	g_object_unref(demo->model);
	demo->model = NULL;
	}

	g_free(demo);
	}

	static GtkWidget *pgd_form_field_view_new(void)
	{
	GtkWidget frame, label;

	frame = gtk_frame_new(NULL);
	gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_NONE);
	label = gtk_label_new(NULL);
	gtk_label_set_markup(GTK_LABEL(label), "<b>Form Field Properties</b>");
	gtk_frame_set_label_widget(GTK_FRAME(frame), label);
	gtk_widget_show(label);

	return frame;
	}

	static void pgd_form_field_view_add_choice_items(GtkGrid table, PopplerFormField field, gint selected, gint row)
	{
	GtkWidget *label;
	GtkWidget textview, swindow;
	GtkTextBuffer *buffer;
	gint i;

	label = gtk_label_new(NULL);
	g_object_set(G_OBJECT(label), "xalign", 0.0, NULL);
	gtk_label_set_markup(GTK_LABEL(label), "<b>Items:</b>");
	gtk_grid_attach(GTK_GRID(table), label, 0, *row, 1, 1);
	gtk_widget_show(label);

	swindow = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swindow), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

	textview = gtk_text_view_new();
	gtk_text_view_set_editable(GTK_TEXT_VIEW(textview), FALSE);
	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview));

	for (i = 0; i < poppler_form_field_choice_get_n_items(field); i++) {
	gchar *item;

	item = poppler_form_field_choice_get_item(field, i);
	gtk_text_buffer_insert_at_cursor(buffer, item, strlen(item));
	gtk_text_buffer_insert_at_cursor(buffer, "\n", strlen("\n"));
	g_free(item);

	if (poppler_form_field_choice_is_item_selected(field, i))
	*selected = i;
	}

	gtk_container_add(GTK_CONTAINER(swindow), textview);
	gtk_widget_show(textview);

	gtk_grid_attach(GTK_GRID(table), swindow, 1, *row, 1, 1);
	gtk_widget_show(swindow);

	*row += 1;
	}

	static void pgd_form_field_view_set_field(GtkWidget field_view, PopplerFormField field)
	{
	GtkWidget *table;
	PopplerAction *action;
	GEnumValue *enum_value;
	gchar *text;
	gint row = 0;
	PopplerSignatureInfo *psig_info;

	table = gtk_bin_get_child(GTK_BIN(field_view));
	if (table) {
	gtk_container_remove(GTK_CONTAINER(field_view), table);
	}

	if (!field)
	return;

	table = gtk_grid_new();
	gtk_widget_set_margin_top(table, 5);
	gtk_widget_set_margin_bottom(table, 5);
	#if GTK_CHECK_VERSION(3, 12, 0)
	gtk_widget_set_margin_start(table, 12);
	gtk_widget_set_margin_end(table, 5);
	#else
	gtk_widget_set_margin_left(table, 12);
	gtk_widget_set_margin_right(table, 5);
	#endif
	gtk_grid_set_column_spacing(GTK_GRID(table), 6);
	gtk_grid_set_row_spacing(GTK_GRID(table), 6);

	text = poppler_form_field_get_name(field);
	if (text) {
	pgd_table_add_property(GTK_GRID(table), "<b>Name:</b>", text, &row);
	g_free(text);
	}
	text = poppler_form_field_get_partial_name(field);
	if (text) {
	pgd_table_add_property(GTK_GRID(table), "<b>Partial Name:</b>", text, &row);
	g_free(text);
	}
	text = poppler_form_field_get_mapping_name(field);
	if (text) {
	pgd_table_add_property(GTK_GRID(table), "<b>Mapping Name:</b>", text, &row);
	g_free(text);
	}

	action = poppler_form_field_get_action(field);
	if (action) {
	GtkWidget *action_view;

	action_view = pgd_action_view_new(NULL);
	pgd_action_view_set_action(action_view, action);
	pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Action:</b>", action_view, &row);
	gtk_widget_show(action_view);
	}

	action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_FIELD_MODIFIED);
	if (action) {
	GtkWidget *action_view;

	action_view = pgd_action_view_new(NULL);
	pgd_action_view_set_action(action_view, action);
	pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Field Modified Action:</b>", action_view, &row);
	gtk_widget_show(action_view);
	}

	action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_FORMAT_FIELD);
	if (action) {
	GtkWidget *action_view;

	action_view = pgd_action_view_new(NULL);
	pgd_action_view_set_action(action_view, action);
	pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Field Format Action:</b>", action_view, &row);
	gtk_widget_show(action_view);
	}

	action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_VALIDATE_FIELD);
	if (action) {
	GtkWidget *action_view;

	action_view = pgd_action_view_new(NULL);
	pgd_action_view_set_action(action_view, action);
	pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Validate Field Action:</b>", action_view, &row);
	gtk_widget_show(action_view);
	}

	action = poppler_form_field_get_additional_action(field, POPPLER_ADDITIONAL_ACTION_CALCULATE_FIELD);
	if (action) {
	GtkWidget *action_view;

	action_view = pgd_action_view_new(NULL);
	pgd_action_view_set_action(action_view, action);
	pgd_table_add_property_with_custom_widget(GTK_GRID(table), "<b>Calculate Field Action:</b>", action_view, &row);
	gtk_widget_show(action_view);
	}

	switch (poppler_form_field_get_field_type(field)) {
	case POPPLER_FORM_FIELD_BUTTON:
	enum_value = g_enum_get_value((GEnumClass *)g_type_class_ref(POPPLER_TYPE_FORM_BUTTON_TYPE), poppler_form_field_button_get_button_type(field));
	pgd_table_add_property(GTK_GRID(table), "<b>Button Type:</b>", enum_value->value_name, &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Button State:</b>", poppler_form_field_button_get_state(field) ? "Active" : "Inactive", &row);
	break;
	case POPPLER_FORM_FIELD_TEXT:
	enum_value = g_enum_get_value((GEnumClass *)g_type_class_ref(POPPLER_TYPE_FORM_TEXT_TYPE), poppler_form_field_text_get_text_type(field));
	pgd_table_add_property(GTK_GRID(table), "<b>Text Type:</b>", enum_value->value_name, &row);

	text = poppler_form_field_text_get_text(field);
	pgd_table_add_property(GTK_GRID(table), "<b>Contents:</b>", text, &row);
	g_free(text);

	text = g_strdup_printf("%d", poppler_form_field_text_get_max_len(field));
	pgd_table_add_property(GTK_GRID(table), "<b>Max Length:</b>", text, &row);
	g_free(text);

	pgd_table_add_property(GTK_GRID(table), "<b>Do spellcheck:</b>", poppler_form_field_text_do_spell_check(field) ? "Yes" : "No", &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Do scroll:</b>", poppler_form_field_text_do_scroll(field) ? "Yes" : "No", &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Rich Text:</b>", poppler_form_field_text_is_rich_text(field) ? "Yes" : "No", &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Pasword type:</b>", poppler_form_field_text_is_password(field) ? "Yes" : "No", &row);
	break;
	case POPPLER_FORM_FIELD_CHOICE: {
	gchar *item;
	gint selected = -1;

	enum_value = g_enum_get_value((GEnumClass *)g_type_class_ref(POPPLER_TYPE_FORM_CHOICE_TYPE), poppler_form_field_choice_get_choice_type(field));
	pgd_table_add_property(GTK_GRID(table), "<b>Choice Type:</b>", enum_value->value_name, &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Editable:</b>", poppler_form_field_choice_is_editable(field) ? "Yes" : "No", &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Multiple Selection:</b>", poppler_form_field_choice_can_select_multiple(field) ? "Yes" : "No", &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Do spellcheck:</b>", poppler_form_field_choice_do_spell_check(field) ? "Yes" : "No", &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Commit on Change:</b>", poppler_form_field_choice_commit_on_change(field) ? "Yes" : "No", &row);

	text = g_strdup_printf("%d", poppler_form_field_choice_get_n_items(field));
	pgd_table_add_property(GTK_GRID(table), "<b>Number of items:</b>", text, &row);
	g_free(text);

	pgd_form_field_view_add_choice_items(GTK_GRID(table), field, &selected, &row);

	if (selected >= 0 && poppler_form_field_choice_get_n_items(field) > selected) {
	item = poppler_form_field_choice_get_item(field, selected);
	text = g_strdup_printf("%d (%s)", selected, item);
	g_free(item);
	pgd_table_add_property(GTK_GRID(table), "<b>Selected item:</b>", text, &row);
	g_free(text);
	}

	text = poppler_form_field_choice_get_text(field);
	pgd_table_add_property(GTK_GRID(table), "<b>Contents:</b>", text, &row);
	g_free(text);
	} break;
	case POPPLER_FORM_FIELD_SIGNATURE: {
	const gchar *signer_name;

	psig_info = poppler_form_field_signature_validate_sync(
	field, POPPLER_SIGNATURE_VALIDATION_FLAG_VALIDATE_CERTIFICATE \| POPPLER_SIGNATURE_VALIDATION_FLAG_WITHOUT_OCSP_REVOCATION_CHECK \| POPPLER_SIGNATURE_VALIDATION_FLAG_USE_AIA_CERTIFICATE_FETCH, NULL, NULL);
	signer_name = poppler_signature_info_get_signer_name(psig_info);
	pgd_table_add_property(GTK_GRID(table), "<b>Signer Name:</b>", signer_name ? signer_name : "Signers name found", &row);
	text = g_date_time_format(poppler_signature_info_get_local_signing_time(psig_info), "%b %d %Y %H:%M:%S");
	pgd_table_add_property(GTK_GRID(table), "<b>Signing Time:</b>", text, &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Signature Val Status:</b>", poppler_signature_info_get_signature_status(psig_info) == POPPLER_SIGNATURE_VALID ? "Signature is Valid" : "Signature is Invalid", &row);
	pgd_table_add_property(GTK_GRID(table), "<b>Certificate Val Status:</b>", poppler_signature_info_get_certificate_status(psig_info) == POPPLER_CERTIFICATE_TRUSTED ? "Certificate is Trusted" : "Certificate cannot be Trusted", &row);

	poppler_signature_info_free(psig_info);
	g_free(text);
	} break;
	case POPPLER_FORM_FIELD_UNKNOWN:
	break;
	default:
	g_assert_not_reached();
	}

	gtk_container_add(GTK_CONTAINER(field_view), table);
	gtk_widget_show(table);
	}

	const gchar get_form_field_type(PopplerFormField field)
	{
	switch (poppler_form_field_get_field_type(field)) {
	case POPPLER_FORM_FIELD_TEXT:
	return "Text";
	case POPPLER_FORM_FIELD_BUTTON:
	return "Button";
	case POPPLER_FORM_FIELD_CHOICE:
	return "Choice";
	case POPPLER_FORM_FIELD_SIGNATURE:
	return "Signature";
	case POPPLER_FORM_FIELD_UNKNOWN:
	default:
	break;
	}

	return "Unknown";
	}

	static void pgd_forms_get_form_fields(GtkWidget button, PgdFormsDemo demo)
	{
	PopplerPage *page;
	GList mapping, l;
	gint n_fields;
	GTimer *timer;

	gtk_list_store_clear(demo->model);
	pgd_form_field_view_set_field(demo->field_view, NULL);

	page = poppler_document_get_page(demo->doc, demo->page);
	if (!page)
	return;

	timer = g_timer_new();
	mapping = poppler_page_get_form_field_mapping(page);
	g_timer_stop(timer);

	n_fields = g_list_length(mapping);
	if (n_fields > 0) {
	gchar *str;

	str = g_strdup_printf("<i>%d form fields found in %.4f seconds</i>", n_fields, g_timer_elapsed(timer, NULL));
	gtk_label_set_markup(GTK_LABEL(demo->timer_label), str);
	g_free(str);
	} else {
	gtk_label_set_markup(GTK_LABEL(demo->timer_label), "<i>No form fields found</i>");
	}

	g_timer_destroy(timer);

	for (l = mapping; l; l = g_list_next(l)) {
	PopplerFormFieldMapping *fmapping;
	GtkTreeIter iter;
	gchar x1, y1, x2, y2;

	fmapping = (PopplerFormFieldMapping *)l->data;

	x1 = g_strdup_printf("%.2f", fmapping->area.x1);
	y1 = g_strdup_printf("%.2f", fmapping->area.y1);
	x2 = g_strdup_printf("%.2f", fmapping->area.x2);
	y2 = g_strdup_printf("%.2f", fmapping->area.y2);

	gtk_list_store_append(demo->model, &iter);
	gtk_list_store_set(demo->model, &iter, FORMS_FIELD_TYPE_COLUMN, get_form_field_type(fmapping->field), FORMS_ID_COLUMN, poppler_form_field_get_id(fmapping->field), FORMS_READ_ONLY_COLUMN,
	poppler_form_field_is_read_only(fmapping->field), FORMS_X1_COLUMN, x1, FORMS_Y1_COLUMN, y1, FORMS_X2_COLUMN, x2, FORMS_Y2_COLUMN, y2, FORMS_FIELD_COLUMN, fmapping->field, -1);
	g_free(x1);
	g_free(y1);
	g_free(x2);
	g_free(y2);
	}

	poppler_page_free_form_field_mapping(mapping);
	g_object_unref(page);
	}

	static void pgd_forms_page_selector_value_changed(GtkSpinButton spinbutton, PgdFormsDemo demo)
	{
	demo->page = (gint)gtk_spin_button_get_value(spinbutton) - 1;
	}

	static void pgd_forms_selection_changed(GtkTreeSelection treeselection, PgdFormsDemo demo)
	{
	GtkTreeModel *model;
	GtkTreeIter iter;

	if (gtk_tree_selection_get_selected(treeselection, &model, &iter)) {
	PopplerFormField *field;

	gtk_tree_model_get(model, &iter, FORMS_FIELD_COLUMN, &field, -1);
	pgd_form_field_view_set_field(demo->field_view, field);
	g_object_unref(field);
	}
	}

	GtkWidget pgd_forms_create_widget(PopplerDocument document)
	{
	PgdFormsDemo *demo;
	GtkWidget *label;
	GtkWidget *vbox;
	GtkWidget hbox, page_selector;
	GtkWidget *button;
	GtkWidget *hpaned;
	GtkWidget swindow, treeview;
	GtkTreeSelection *selection;
	GtkCellRenderer *renderer;
	gchar *str;
	gint n_pages;

	demo = g_new0(PgdFormsDemo, 1);

	demo->doc = g_object_ref(document);

	n_pages = poppler_document_get_n_pages(document);

	vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 12);

	hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 6);

	label = gtk_label_new("Page:");
	gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, TRUE, 0);
	gtk_widget_show(label);

	page_selector = gtk_spin_button_new_with_range(1, n_pages, 1);
	g_signal_connect(G_OBJECT(page_selector), "value-changed", G_CALLBACK(pgd_forms_page_selector_value_changed), (gpointer)demo);
	gtk_box_pack_start(GTK_BOX(hbox), page_selector, FALSE, TRUE, 0);
	gtk_widget_show(page_selector);

	str = g_strdup_printf("of %d", n_pages);
	label = gtk_label_new(str);
	gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, TRUE, 0);
	gtk_widget_show(label);
	g_free(str);

	button = gtk_button_new_with_label("Get Forms Fields");
	g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(pgd_forms_get_form_fields), (gpointer)demo);
	gtk_box_pack_end(GTK_BOX(hbox), button, FALSE, FALSE, 0);
	gtk_widget_show(button);

	gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, TRUE, 0);
	gtk_widget_show(hbox);

	demo->timer_label = gtk_label_new(NULL);
	gtk_label_set_markup(GTK_LABEL(demo->timer_label), "<i>No form fields found</i>");
	g_object_set(G_OBJECT(demo->timer_label), "xalign", 1.0, NULL);
	gtk_box_pack_start(GTK_BOX(vbox), demo->timer_label, FALSE, TRUE, 0);
	gtk_widget_show(demo->timer_label);

	hpaned = gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);

	demo->field_view = pgd_form_field_view_new();

	swindow = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swindow), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

	demo->model = gtk_list_store_new(N_COLUMNS, G_TYPE_STRING, G_TYPE_INT, G_TYPE_BOOLEAN, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_OBJECT);
	treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(demo->model));

	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 0, "Form Field Type", renderer, "text", FORMS_FIELD_TYPE_COLUMN, NULL);

	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 1, "Form Field Id", renderer, "text", FORMS_ID_COLUMN, NULL);

	renderer = gtk_cell_renderer_toggle_new();
	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 2, "Read Only", renderer, "active", FORMS_READ_ONLY_COLUMN, NULL);

	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 3, "X1", renderer, "text", FORMS_X1_COLUMN, NULL);
	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 4, "Y1", renderer, "text", FORMS_Y1_COLUMN, NULL);
	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 5, "X2", renderer, "text", FORMS_X2_COLUMN, NULL);
	renderer = gtk_cell_renderer_text_new();
	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(treeview), 6, "Y2", renderer, "text", FORMS_Y2_COLUMN, NULL);

	selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));
	g_signal_connect(G_OBJECT(selection), "changed", G_CALLBACK(pgd_forms_selection_changed), (gpointer)demo);

	gtk_container_add(GTK_CONTAINER(swindow), treeview);
	gtk_widget_show(treeview);

	gtk_paned_add1(GTK_PANED(hpaned), swindow);
	gtk_widget_show(swindow);

	gtk_paned_add2(GTK_PANED(hpaned), demo->field_view);
	gtk_widget_show(demo->field_view);

	gtk_paned_set_position(GTK_PANED(hpaned), 300);

	gtk_box_pack_start(GTK_BOX(vbox), hpaned, TRUE, TRUE, 0);
	gtk_widget_show(hpaned);

	g_object_weak_ref(G_OBJECT(vbox), (GWeakNotify)pgd_forms_free, demo);

	return vbox;
	}