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