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-rw-r--r--src/prompt_toolkit/widgets/menus.py374
1 files changed, 374 insertions, 0 deletions
diff --git a/src/prompt_toolkit/widgets/menus.py b/src/prompt_toolkit/widgets/menus.py
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+++ b/src/prompt_toolkit/widgets/menus.py
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+from typing import Callable, Iterable, List, Optional, Sequence, Union
+
+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: Optional[List[Float]] = None,
+ key_bindings: Optional[KeyBindingsBase] = 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) -> Optional[List[Float]]:
+ return self.container.floats
+
+ def __pt_container__(self) -> Container:
+ return self.container
+
+
+class MenuItem:
+ def __init__(
+ self,
+ text: str = "",
+ handler: Optional[Callable[[], None]] = None,
+ children: Optional[List["MenuItem"]] = None,
+ shortcut: Optional[Sequence[Union[Keys, str]]] = 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