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|
from __future__ import annotations
from typing import Callable, Iterable, Sequence
from prompt_toolkit.application.current import get_app
from prompt_toolkit.filters import Condition
from prompt_toolkit.formatted_text.base import OneStyleAndTextTuple, StyleAndTextTuples
from prompt_toolkit.key_binding.key_bindings import KeyBindings, KeyBindingsBase
from prompt_toolkit.key_binding.key_processor import KeyPressEvent
from prompt_toolkit.keys import Keys
from prompt_toolkit.layout.containers import (
AnyContainer,
ConditionalContainer,
Container,
Float,
FloatContainer,
HSplit,
Window,
)
from prompt_toolkit.layout.controls import FormattedTextControl
from prompt_toolkit.mouse_events import MouseEvent, MouseEventType
from prompt_toolkit.utils import get_cwidth
from prompt_toolkit.widgets import Shadow
from .base import Border
__all__ = [
"MenuContainer",
"MenuItem",
]
E = KeyPressEvent
class MenuContainer:
"""
:param floats: List of extra Float objects to display.
:param menu_items: List of `MenuItem` objects.
"""
def __init__(
self,
body: AnyContainer,
menu_items: list[MenuItem],
floats: list[Float] | None = None,
key_bindings: KeyBindingsBase | None = None,
) -> None:
self.body = body
self.menu_items = menu_items
self.selected_menu = [0]
# Key bindings.
kb = KeyBindings()
@Condition
def in_main_menu() -> bool:
return len(self.selected_menu) == 1
@Condition
def in_sub_menu() -> bool:
return len(self.selected_menu) > 1
# Navigation through the main menu.
@kb.add("left", filter=in_main_menu)
def _left(event: E) -> None:
self.selected_menu[0] = max(0, self.selected_menu[0] - 1)
@kb.add("right", filter=in_main_menu)
def _right(event: E) -> None:
self.selected_menu[0] = min(
len(self.menu_items) - 1, self.selected_menu[0] + 1
)
@kb.add("down", filter=in_main_menu)
def _down(event: E) -> None:
self.selected_menu.append(0)
@kb.add("c-c", filter=in_main_menu)
@kb.add("c-g", filter=in_main_menu)
def _cancel(event: E) -> None:
"Leave menu."
event.app.layout.focus_last()
# Sub menu navigation.
@kb.add("left", filter=in_sub_menu)
@kb.add("c-g", filter=in_sub_menu)
@kb.add("c-c", filter=in_sub_menu)
def _back(event: E) -> None:
"Go back to parent menu."
if len(self.selected_menu) > 1:
self.selected_menu.pop()
@kb.add("right", filter=in_sub_menu)
def _submenu(event: E) -> None:
"go into sub menu."
if self._get_menu(len(self.selected_menu) - 1).children:
self.selected_menu.append(0)
# If This item does not have a sub menu. Go up in the parent menu.
elif (
len(self.selected_menu) == 2
and self.selected_menu[0] < len(self.menu_items) - 1
):
self.selected_menu = [
min(len(self.menu_items) - 1, self.selected_menu[0] + 1)
]
if self.menu_items[self.selected_menu[0]].children:
self.selected_menu.append(0)
@kb.add("up", filter=in_sub_menu)
def _up_in_submenu(event: E) -> None:
"Select previous (enabled) menu item or return to main menu."
# Look for previous enabled items in this sub menu.
menu = self._get_menu(len(self.selected_menu) - 2)
index = self.selected_menu[-1]
previous_indexes = [
i
for i, item in enumerate(menu.children)
if i < index and not item.disabled
]
if previous_indexes:
self.selected_menu[-1] = previous_indexes[-1]
elif len(self.selected_menu) == 2:
# Return to main menu.
self.selected_menu.pop()
@kb.add("down", filter=in_sub_menu)
def _down_in_submenu(event: E) -> None:
"Select next (enabled) menu item."
menu = self._get_menu(len(self.selected_menu) - 2)
index = self.selected_menu[-1]
next_indexes = [
i
for i, item in enumerate(menu.children)
if i > index and not item.disabled
]
if next_indexes:
self.selected_menu[-1] = next_indexes[0]
@kb.add("enter")
def _click(event: E) -> None:
"Click the selected menu item."
item = self._get_menu(len(self.selected_menu) - 1)
if item.handler:
event.app.layout.focus_last()
item.handler()
# Controls.
self.control = FormattedTextControl(
self._get_menu_fragments, key_bindings=kb, focusable=True, show_cursor=False
)
self.window = Window(height=1, content=self.control, style="class:menu-bar")
submenu = self._submenu(0)
submenu2 = self._submenu(1)
submenu3 = self._submenu(2)
@Condition
def has_focus() -> bool:
return get_app().layout.current_window == self.window
self.container = FloatContainer(
content=HSplit(
[
# The titlebar.
self.window,
# The 'body', like defined above.
body,
]
),
floats=[
Float(
xcursor=True,
ycursor=True,
content=ConditionalContainer(
content=Shadow(body=submenu), filter=has_focus
),
),
Float(
attach_to_window=submenu,
xcursor=True,
ycursor=True,
allow_cover_cursor=True,
content=ConditionalContainer(
content=Shadow(body=submenu2),
filter=has_focus
& Condition(lambda: len(self.selected_menu) >= 1),
),
),
Float(
attach_to_window=submenu2,
xcursor=True,
ycursor=True,
allow_cover_cursor=True,
content=ConditionalContainer(
content=Shadow(body=submenu3),
filter=has_focus
& Condition(lambda: len(self.selected_menu) >= 2),
),
),
# --
]
+ (floats or []),
key_bindings=key_bindings,
)
def _get_menu(self, level: int) -> MenuItem:
menu = self.menu_items[self.selected_menu[0]]
for i, index in enumerate(self.selected_menu[1:]):
if i < level:
try:
menu = menu.children[index]
except IndexError:
return MenuItem("debug")
return menu
def _get_menu_fragments(self) -> StyleAndTextTuples:
focused = get_app().layout.has_focus(self.window)
# This is called during the rendering. When we discover that this
# widget doesn't have the focus anymore. Reset menu state.
if not focused:
self.selected_menu = [0]
# Generate text fragments for the main menu.
def one_item(i: int, item: MenuItem) -> Iterable[OneStyleAndTextTuple]:
def mouse_handler(mouse_event: MouseEvent) -> None:
hover = mouse_event.event_type == MouseEventType.MOUSE_MOVE
if (
mouse_event.event_type == MouseEventType.MOUSE_DOWN
or hover
and focused
):
# Toggle focus.
app = get_app()
if not hover:
if app.layout.has_focus(self.window):
if self.selected_menu == [i]:
app.layout.focus_last()
else:
app.layout.focus(self.window)
self.selected_menu = [i]
yield ("class:menu-bar", " ", mouse_handler)
if i == self.selected_menu[0] and focused:
yield ("[SetMenuPosition]", "", mouse_handler)
style = "class:menu-bar.selected-item"
else:
style = "class:menu-bar"
yield style, item.text, mouse_handler
result: StyleAndTextTuples = []
for i, item in enumerate(self.menu_items):
result.extend(one_item(i, item))
return result
def _submenu(self, level: int = 0) -> Window:
def get_text_fragments() -> StyleAndTextTuples:
result: StyleAndTextTuples = []
if level < len(self.selected_menu):
menu = self._get_menu(level)
if menu.children:
result.append(("class:menu", Border.TOP_LEFT))
result.append(("class:menu", Border.HORIZONTAL * (menu.width + 4)))
result.append(("class:menu", Border.TOP_RIGHT))
result.append(("", "\n"))
try:
selected_item = self.selected_menu[level + 1]
except IndexError:
selected_item = -1
def one_item(
i: int, item: MenuItem
) -> Iterable[OneStyleAndTextTuple]:
def mouse_handler(mouse_event: MouseEvent) -> None:
if item.disabled:
# The arrow keys can't interact with menu items that are disabled.
# The mouse shouldn't be able to either.
return
hover = mouse_event.event_type == MouseEventType.MOUSE_MOVE
if (
mouse_event.event_type == MouseEventType.MOUSE_UP
or hover
):
app = get_app()
if not hover and item.handler:
app.layout.focus_last()
item.handler()
else:
self.selected_menu = self.selected_menu[
: level + 1
] + [i]
if i == selected_item:
yield ("[SetCursorPosition]", "")
style = "class:menu-bar.selected-item"
else:
style = ""
yield ("class:menu", Border.VERTICAL)
if item.text == "-":
yield (
style + "class:menu-border",
f"{Border.HORIZONTAL * (menu.width + 3)}",
mouse_handler,
)
else:
yield (
style,
f" {item.text}".ljust(menu.width + 3),
mouse_handler,
)
if item.children:
yield (style, ">", mouse_handler)
else:
yield (style, " ", mouse_handler)
if i == selected_item:
yield ("[SetMenuPosition]", "")
yield ("class:menu", Border.VERTICAL)
yield ("", "\n")
for i, item in enumerate(menu.children):
result.extend(one_item(i, item))
result.append(("class:menu", Border.BOTTOM_LEFT))
result.append(("class:menu", Border.HORIZONTAL * (menu.width + 4)))
result.append(("class:menu", Border.BOTTOM_RIGHT))
return result
return Window(FormattedTextControl(get_text_fragments), style="class:menu")
@property
def floats(self) -> list[Float] | None:
return self.container.floats
def __pt_container__(self) -> Container:
return self.container
class MenuItem:
def __init__(
self,
text: str = "",
handler: Callable[[], None] | None = None,
children: list[MenuItem] | None = None,
shortcut: Sequence[Keys | str] | None = None,
disabled: bool = False,
) -> None:
self.text = text
self.handler = handler
self.children = children or []
self.shortcut = shortcut
self.disabled = disabled
self.selected_item = 0
@property
def width(self) -> int:
if self.children:
return max(get_cwidth(c.text) for c in self.children)
else:
return 0
|
