gtk - GtkEntry change text on user input -


in gui want modify text user inserts in gtkentry. eg if user enters 'john doe', gui should see not nicely formatted name , changes 'john doe'.

i connect handler "changed" signal described in eg gtkentry text change signal. problem occurs if change entry in signal handler, "changed" signal emitted again , again until kingdom comes.

i prevent doing string comparison, , change text in gtkentrybuffer if text "namified" version unequal text inside entry. feel programmer should able change the text inside entry without changed handler called on , on again.

the changed signal handler is:

void nameify_entry ( gtkeditable* editable, gpointer data ) {     gchar* nameified;     const gchar *entry_text;      entry_text = gtk_entry_get_text( gtk_entry(editable) );     nameified = nameify(entry_text);      /*is possible change buffer without using string       comparison, without "change" signal being emitted on , on again?*/     if ( g_strcmp0(entry_text, nameified) != 0 ){         gtkentrybuffer* buf = gtk_entry_get_buffer(gtk_entry(editable) );         gtk_entry_buffer_set_text( buf, nameified, -1 );     }     g_free(nameified); }

and nameify function is:

/*removes characters should not belong name*/ gchar* nameify ( const char* cstr ) {     const char* c;     gchar* ret_val;     gstring* s = g_string_new("");      gboolean uppercase_next = true;     g_debug( "string = %s", cstr);      ( c = cstr; *c != '0'; c = g_utf8_next_char(c) ) {         gunichar cp = g_utf8_get_char(c);          if ( cp == 0 ) break;         if ( g_unichar_isalpha( cp ) ){             if ( uppercase_next ){                 g_string_append_unichar( s, g_unichar_toupper(cp) );                 uppercase_next = false;             }             else{                 g_string_append_unichar(s,g_unichar_tolower(cp));             }         }         if ( cp == '-' ){             g_string_append_unichar( s, cp);             uppercase_next = true;         }         if ( cp == ' '){             g_string_append_unichar( s, cp);             uppercase_next = true;         }     }      ret_val = s->str;     g_string_free(s, false);     return ret_val; }

any welcome.

it's not handy connect 'changed' signal, more appropriate connect 'insert-text' signal. better have default 'insert-text' handler update entry. use g_signal_connect_after on 'insert-text' signal update text in entry prevents changed signal run infinitely. should done 'delete-text' signal, because if user deletes capital letter, capital should removed , second should capitalized.

so on creation run:

g_signal_connect_after( entry, "insert-text", g_callback(name_insert_after), null ); g_signal_connect_after( entry, "delete-text", g_callback(name_delete_after), null );

then can have these signal handlers: 

void name_insert_after (gtkeditable* edit,                    gchar* new_text,                    gint new_length,                    gpointer position,                    gpointer data) {     /*prevent compiler warnings unused variables*/     (void) new_text; (void) new_length; (void) position; (void) data;     const gchar* content = gtk_entry_get_text( gtk_entry(edit) );     gchar* modified = nameify( content);     gtk_entry_set_text(gtk_entry(edit),modified);     g_free(modified); }  void name_delete_after (gtkeditable* edit,                    gint start_pos,                    gint end_pos,                    gpointer data) {     /*no op cast prevent compiler warnings*/     (void) start_pos; (void) end_pos; (void) data;     /*get text , modify entry*/     int cursor_pos = gtk_editable_get_position(edit);     const gchar* content = gtk_entry_get_text( gtk_entry(edit) );     gchar* modified = nameify( content);     gtk_entry_set_text(gtk_entry(edit),modified);     gtk_editable_set_position(edit, cursor_pos);     g_free(modified); }

and these can used nameify function in original post. might provide function pointer @ data instead of 'null' use 1 handler different functions able modify string in entry.


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