[taler-anastasis-gtk] branch master updated: fix #7086

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grothoff pushed a commit to branch master
in repository anastasis-gtk.

The following commit(s) were added to refs/heads/master by this push:
     new 987f3f2  fix #7086
987f3f2 is described below

commit 987f3f2f2d4f7fd61c115323fb17e6889f1e1120
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Tue Dec 28 12:46:15 2021 +0100

    fix #7086
---
 contrib/anastasis_gtk_main_window.glade    |   4 +
 src/anastasis/Makefile.am                  |   1 +
 src/anastasis/anastasis-gtk_autocomplete.c | 143 +++++++++++++++++++++++++++++
 3 files changed, 148 insertions(+)

diff --git a/contrib/anastasis_gtk_main_window.glade 
b/contrib/anastasis_gtk_main_window.glade
index 1b1ab4e..30bbd49 100644
--- a/contrib/anastasis_gtk_main_window.glade
+++ b/contrib/anastasis_gtk_main_window.glade
@@ -1230,6 +1230,8 @@ Author: Christian Grothoff, Dennis Neufeld
                                                         <property 
name="placeholder-text" translatable="yes">756.1222.3425.89</property>
                                                         <property 
name="input-purpose">number</property>
                                                         <signal name="changed" 
handler="AG_identity_changed" swapped="no"/>
+                                                        <signal 
name="delete-text" handler="anastasis_gtk_autocomplete_delete_text" 
swapped="no"/>
+                                                        <signal 
name="insert-text" handler="anastasis_gtk_autocomplete_insert_text" 
swapped="no"/>
                                                         <signal 
name="style-updated" handler="gtk_widget_queue_draw" swapped="no"/>
                                                       </object>
                                                       <packing>
@@ -1565,6 +1567,8 @@ Author: Christian Grothoff, Dennis Neufeld
                                                         <property 
name="max-width-chars">11</property>
                                                         <property 
name="placeholder-text" translatable="yes">000-00-0000</property>
                                                         <signal name="changed" 
handler="AG_identity_changed" swapped="no"/>
+                                                        <signal 
name="delete-text" handler="anastasis_gtk_autocomplete_delete_text" 
swapped="no"/>
+                                                        <signal 
name="insert-text" handler="anastasis_gtk_autocomplete_insert_text" 
swapped="no"/>
                                                         <signal 
name="style-updated" handler="gtk_widget_queue_draw" swapped="no"/>
                                                       </object>
                                                       <packing>
diff --git a/src/anastasis/Makefile.am b/src/anastasis/Makefile.am
index fe908df..1e80236 100644
--- a/src/anastasis/Makefile.am
+++ b/src/anastasis/Makefile.am
@@ -14,6 +14,7 @@ anastasis_gtk_SOURCES = \
   anastasis-gtk.c anastasis-gtk.h \
   anastasis-gtk_action.c anastasis-gtk_action.h \
   anastasis-gtk_attributes.c anastasis-gtk_attributes.h \
+  anastasis-gtk_autocomplete.c \
   anastasis-gtk_dispatch.c anastasis-gtk_dispatch.h \
   anastasis-gtk_io.c \
   anastasis-gtk_handle-auth-delete-button-clicked.c \
diff --git a/src/anastasis/anastasis-gtk_autocomplete.c 
b/src/anastasis/anastasis-gtk_autocomplete.c
new file mode 100644
index 0000000..1e3da34
--- /dev/null
+++ b/src/anastasis/anastasis-gtk_autocomplete.c
@@ -0,0 +1,143 @@
+/*
+     This file is part of anastasis-gtk.
+     Copyright (C) 2021 Anastasis SARL
+
+     Anastasis 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 3, or (at your
+     option) any later version.
+
+     Anastasis 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 Anastasis; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+/**
+ * @file src/anastasis/anastasis-gtk_autocomplete.c
+ * @brief Autocomplete logic for GtkEntry widgets
+ * @author Christian Grothoff
+ */
+#include <gnunet/platform.h>
+#include <gnunet/gnunet_util_lib.h>
+#include "anastasis-gtk_attributes.h"
+#include "anastasis-gtk_dispatch.h"
+#include "anastasis-gtk_helper.h"
+#include <jansson.h>
+
+
+/**
+ * Lookup autocompletion string for @a editable widget.
+ *
+ * @param editable widget to lookup
+ * @return NULL if not found
+ */
+static const char *
+lookup_autocomplete (GtkEditable *editable)
+{
+  json_t *a;
+  size_t index;
+  json_t *ra = json_object_get (AG_redux_state,
+                                "required_attributes");
+  if (NULL == ra)
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  json_array_foreach (ra, index, a)
+  {
+    const char *widget_name = json_string_value (json_object_get (a,
+                                                                  "widget"));
+    if (editable ==
+        GTK_EDITABLE (GCG_get_main_window_object (ai[i].widget_name)))
+      return json_string_value (json_object_get (a,
+                                                 "autocomplete"));
+  }
+  GNUNET_break (0);
+  return NULL;
+}
+
+
+/**
+ * Function called from an auto-completed entry widget up on upon text
+ * deletion.
+ *
+ * @param editable the widget
+ * @param start_pos starting position
+ * @param end_pos end position
+ * @param user_data unused
+ */
+void
+anastasis_gtk_autocomplete_delete_text (GtkEditable *editable,
+                                        int start_pos,
+                                        int end_pos,
+                                        void *user_data)
+{
+  const char *ac;
+  (void) user_data;
+
+  ac = lookup_autocomplete (editable);
+  if (NULL == ac)
+    return;
+  if (0 == start_pos)
+    return;
+#if CONFUSING_UX_DESIRED
+  if (ac[start_pos] != '?')
+  {
+    g_signal_stop_emission_by_name (editable,
+                                    "delete-text");
+    gtk_editable_delete_text (editable,
+                              start_pos - 1,
+                              end_pos);
+  }
+#endif
+}
+
+
+/**
+ * Function called from an auto-completed widget upon text insertion.
+ *
+ * @param editable the widget
+ * @param new_text inserted text
+ * @param new_text_length number of bytes in @a new_text
+ * @param position insertion position
+ * @param user_data unused
+ */
+void
+anastasis_gtk_autocomplete_insert_text (GtkEditable *editable,
+                                        const char *new_text,
+                                        int new_text_length,
+                                        gpointer position,
+                                        void *user_data)
+{
+  const char *ac;
+  (void) user_data;
+  gint pos;
+  char *replacement;
+
+  ac = lookup_autocomplete (editable);
+  if (NULL == ac)
+    return;
+  pos = gtk_editable_get_position (editable);
+  if (strlen (ac) <= pos + new_text_length)
+    return;
+  if (ac[pos+new_text_length] != '?')
+  {
+    g_signal_stop_emission_by_name (editable,
+                                    "insert-text");
+    GNUNET_asprintf (&replacement,
+                     "%.*s%c",
+                     new_text_length,
+                     new_text,
+                     ac[pos+new_text_length]);
+    gtk_editable_insert_text (editable,
+                              replacement,
+                              -1,
+                              position);
+    GNUNET_free (replacement);
+  }
+}

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