def _display_options(self, instance: AdvancedTextInput, behavior: str,
option: list) -> bool:
"""Private function to display options under self.commandText.last_row.
This function is fired when self.commandText.on_next_options or
self.commandText.on_prev_options is called. Essentially, this function
will display options based on behavior and calculate start indices of
displayed options. According to behavior, there are three scenarios:
[Scenario 1]: When behavior == "init", the function will display the
first n (n = max(self.options_per_line, [the number of remaining
options])) options;
[Scenario 2]: When behavior == "next", the function will display the
next n options;
[Scenario 3]: When behavior == "prev", the function will display the
previous n options.
[ensures]: [display n options below self.commandText.last_row]
self.tab_index = -1
[convention #3.1]
"""
# display options based on behavior
instance.do_cursor_movement("cursor_end", control=True)
cursor = instance.cursor
if behavior == "init":
self.page_index = 0
else:
self._clear_options(instance)
instance.completion_mode = False
self.tab_index = -1
next_index = self.page_index + self.options_per_line\
if behavior == "next"\
else self.page_index - self.options_per_line
self.page_index = max(0, next_index)\
if next_index < len(option)\
else self.page_index
end_index = self.page_index + self.options_per_line\
if self.page_index + self.options_per_line <= len(option)\
else len(option)
instance.insert_text("\n" +
" ".join(option[self.page_index:end_index]))
instance.completion_mode = True
instance.cursor = cursor
instance._reset_last_line()
instance.on_cursor(instance, instance.cursor)
# calc start indices of displayed options
index = 0
self.start_indices.clear()
for s in option[self.page_index:end_index]:
self.start_indices.append(index)
index += len(s) + 1
return True
def _stop_completion(self, instance: AdvancedTextInput) -> None:
"""Private function to stop completion mode.
[requires]: instance.completion_mode
[ensures]: not instance.completion_mode
self.tab_index = -1
self.option = []
self.start_indices = []
[calls]: self._clear_options
"""
if not asserts(instance.completion_mode, "Not in completion mode"):
return
self._clear_options(instance)
instance.completion_mode = False
instance._reset_last_line()
instance.on_cursor(instance, instance.cursor)
self.tab_index = -1
self.option = []
self.start_indices = []