text: Fix set_surrounding_text request

Add cursor and anchor positions as arguments to the set_surrounding_text
request. The cursor and anchor positions are relative to the surrounded
text, so it does not make sense to have that separate. Remove the
separate set_cursor_index and set_selected_text requests. Also update
the corresponding event in input-method-context and add support for it
in the weston example keyboard.

Signed-off-by: Jan Arne Petersen <jpetersen@openismus.com>

clients/editor.c

@@ -433,6 +433,11 @@ text_entry_update_layout(struct text_entry *entry)
 	free(text);
 
 	widget_schedule_redraw(entry->widget);
+
+	text_model_set_surrounding_text(entry->model,
+					entry->text,
+					entry->cursor,
+					entry->anchor);
 }
 
 static void

clients/keyboard.c

@@ -136,6 +136,20 @@ button_handler(struct widget *widget,
 	widget_schedule_redraw(widget);
 }
 
+static void
+input_method_context_surrounding_text(void *data,
+				      struct input_method_context *context,
+				      const char *text,
+				      uint32_t cursor,
+				      uint32_t anchor)
+{
+	fprintf(stderr, "Surrounding text updated: %s\n", text);
+}
+
+static const struct input_method_context_listener input_method_context_listener = {
+	input_method_context_surrounding_text,
+};
+
 static void
 input_method_activate(void *data,
 		      struct input_method *input_method,
@@ -147,6 +161,9 @@ input_method_activate(void *data,
 		input_method_context_destroy(keyboard->context);
 
 	keyboard->context = context;
+	input_method_context_add_listener(context,
+					  &input_method_context_listener,
+					  keyboard);
 }
 
 static void