prompt_toolkitキーadd_bindingが機能しない

Question

プロンプトツールキットを学習していて、プロンプトツールキットを使用してカスタムプロンプトを解決しようとしています（私は既に別の方法で動作する標準プロンプトがあることを知っています）。私は、similar questionのJonathanによって与えられた説明に従っています。

これまでのところ、彼は与えたptpythonサンプルの中から提案された部分を取り出して縫い合わせ、私がやりたいことに近づくようにストライプしました。明らかに、私はUP、DOWNイベントを実装し、選択肢を選択するものを見逃していました。何か案は？

from __future__ import unicode_literals 
from prompt_toolkit.application import Application 
from prompt_toolkit.buffer import Buffer 
from prompt_toolkit.document import Document 
from prompt_toolkit.enums import DEFAULT_BUFFER 
from prompt_toolkit.interface import CommandLineInterface 
from prompt_toolkit.key_binding.manager import KeyBindingManager 
from prompt_toolkit.keys import Keys 
from prompt_toolkit.layout.containers import Window 
from prompt_toolkit.layout.controls import BufferControl 
from prompt_toolkit.layout.margins import ScrollbarMargin 
from prompt_toolkit.shortcuts import create_eventloop 
from prompt_toolkit.filters import IsDone 
from prompt_toolkit.layout.controls import TokenListControl 
from prompt_toolkit.layout.containers import ConditionalContainer, ScrollOffsets, VSplit, HSplit 
from prompt_toolkit.layout.screen import Char 
from prompt_toolkit.layout.dimension import LayoutDimension 
from prompt_toolkit.mouse_events import MouseEventTypes 

from pygments.token import Token 


# maybe better use TokenListControl mouse_handler? 
def if_mousedown(handler): 
    def handle_if_mouse_down(cli, mouse_event): 
     if mouse_event.event_type == MouseEventTypes.MOUSE_DOWN: 
      return handler(cli, mouse_event) 
     else: 
      return NotImplemented 
    return handle_if_mouse_down 



class SelIpt(object): 
    show_sidebar = False 
    selected_option_index = 0 
    option_count = 0 

select_input = SelIpt() 


tokens = [] 
T = Token.Sidebar 

def get_tokens(cli): 
    return tokens 


def append(index, label): 
    selected = (index == select_input.selected_option_index) 

    @if_mousedown 
    def select_item(cli, mouse_event): 
     # bind option with this index to mouse event 
     select_input.selected_option_index = index 

    token = T.Selected if selected else T 

    tokens.append((T, ' > ' if selected else ' ')) 
    if selected: 
     tokens.append((Token.SetCursorPosition, '')) 

    tokens.append((token.Label, '%-24s' % label, select_item)) 
    tokens.append((T, '\n')) 


# prepare the select choices 
options = ['mini', 'mausi', 'hasi'] 
for i, option in enumerate(options): 
    append(i, option) 
tokens.pop() # Remove last newline. 
select_input.option_count = 3 


manager = KeyBindingManager.for_prompt() 


class SelectControl(TokenListControl): 
    # SelectControl implements the key bindings 
    @manager.registry.add_binding(Keys.Down, eager=True) 
    def move_cursor_down(self, cli): 
     select_input.selected_option_index = (
      (select_input.selected_option_index + 1) % select_input.option_count) 

    @manager.registry.add_binding(Keys.Up, eager=True) 
    def move_cursor_up(self, cli): 
     select_input.selected_option_index = (
      (select_input.selected_option_index - 1) % select_input.option_count) 


buffers={ 
     DEFAULT_BUFFER: Buffer(initial_document=Document('my selection', 0)), 
     'QUESTION': Buffer(initial_document=Document('what do you want to select?', 0)) 
    } 

@manager.registry.add_binding(Keys.Enter, eager=True) 
def set_answer(event): 
    print('moin moin') 
    buffers[DEFAULT_BUFFER].text = option[select_input.selected_option_index] 
    event.cli.set_return_value(None) 


@manager.registry.add_binding(Keys.ControlQ, eager=True) 
@manager.registry.add_binding(Keys.ControlC, eager=True) 
def _(event): 
    event.cli.set_return_value(None) 


# assemble layout 
prompt = VSplit([ 
    Window(content=BufferControl(buffer_name='QUESTION')), 
    Window(content=BufferControl(buffer_name=DEFAULT_BUFFER)), 
]) 

select = ConditionalContainer(
    Window(
     SelectControl(get_tokens, Char(token=Token.Sidebar)), 
     width=LayoutDimension.exact(43), 
     height=LayoutDimension(min=3), 
     scroll_offsets=ScrollOffsets(top=1, bottom=1) 
    ), 
    filter=~IsDone() 
) 

layout = HSplit([prompt, select]) 


app = Application(
    layout=layout, 
    buffers=buffers, 
    key_bindings_registry=manager.registry, 
    mouse_support=True 
    #use_alternate_screen=True 
) 

eventloop = create_eventloop() 
try: 
    cli = CommandLineInterface(application=app, eventloop=eventloop) 
    cli.run(reset_current_buffer=False) 
finally: 
    eventloop.close() 


# TODO 
# move selection to DEFAULT_BUFFER 
# make select window disapear after CTRL-Q 
# colorize '>' 

Answer 1

ここ

など、Keys.Down、あなたがKeys.Upを扱うことができるようにしたいキーのハンドラを書くには例です：

• https://github.com/jonathanslenders/python-prompt-toolkit/blob/1ffbd3916c31230f12047b09ca875bcc312c1409/prompt_toolkit/key_binding/bindings/basic.py

そして、もっと直接：

class SelectControl(TokenListControl): 
    @manager.registry.add_binding(Keys.Down, eager=True) 
    def move_cursor_down(event): 
     print(event) 

    @manager.registry.add_binding(Keys.Up, eager=True) 
    def move_cursor_up(event): 
     print(event)