655 lines
23 KiB
Python
655 lines
23 KiB
Python
from __future__ import annotations
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import typing
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import warnings
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from itertools import chain, repeat
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from urwid.canvas import CanvasCombine, CompositeCanvas, SolidCanvas
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from urwid.monitored_list import MonitoredFocusList, MonitoredList
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from urwid.util import is_mouse_press
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from .constants import Sizing, WHSettings
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from .container import WidgetContainerListContentsMixin, WidgetContainerMixin
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from .widget import Widget
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if typing.TYPE_CHECKING:
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from collections.abc import Iterable
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from typing_extensions import Literal
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class PileError(Exception):
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pass
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class Pile(Widget, WidgetContainerMixin, WidgetContainerListContentsMixin):
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"""
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A pile of widgets stacked vertically from top to bottom
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"""
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_sizing = frozenset([Sizing.FLOW, Sizing.BOX])
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def __init__(
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self,
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widget_list: Iterable[
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Widget
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| tuple[Literal["pack", WHSettings.PACK] | int, Widget]
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| tuple[Literal["weight", WHSettings.WEIGHT], int, Widget]
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],
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focus_item: Widget | int | None = None,
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) -> None:
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"""
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:param widget_list: child widgets
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:type widget_list: iterable
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:param focus_item: child widget that gets the focus initially.
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Chooses the first selectable widget if unset.
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:type focus_item: Widget or int
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*widget_list* may also contain tuples such as:
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(*given_height*, *widget*)
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always treat *widget* as a box widget and give it *given_height* rows,
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where given_height is an int
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(``'pack'``, *widget*)
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allow *widget* to calculate its own height by calling its :meth:`rows`
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method, ie. treat it as a flow widget.
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(``'weight'``, *weight*, *widget*)
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if the pile is treated as a box widget then treat widget as a box
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widget with a height based on its relative weight value, otherwise
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treat the same as (``'pack'``, *widget*).
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Widgets not in a tuple are the same as (``'weight'``, ``1``, *widget*)`
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.. note:: If the Pile is treated as a box widget there must be at least
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one ``'weight'`` tuple in :attr:`widget_list`.
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"""
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self._selectable = False
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super().__init__()
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self._contents = MonitoredFocusList()
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self._contents.set_modified_callback(self._contents_modified)
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self._contents.set_focus_changed_callback(lambda f: self._invalidate())
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self._contents.set_validate_contents_modified(self._validate_contents_modified)
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for i, original in enumerate(widget_list):
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w = original
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if not isinstance(w, tuple):
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self.contents.append((w, (WHSettings.WEIGHT, 1)))
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elif w[0] in (Sizing.FLOW, WHSettings.PACK):
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f, w = w
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self.contents.append((w, (WHSettings.PACK, None)))
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elif len(w) == 2:
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height, w = w
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self.contents.append((w, (WHSettings.GIVEN, height)))
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elif w[0] == Sizing.FIXED: # backwards compatibility
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_ignore, height, w = w
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self.contents.append((w, (WHSettings.GIVEN, height)))
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elif w[0] == WHSettings.WEIGHT:
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f, height, w = w
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self.contents.append((w, (f, height)))
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else:
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raise PileError(f"initial widget list item invalid {original!r}")
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if focus_item is None and w.selectable():
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focus_item = i
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if self.contents and focus_item is not None:
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self.focus = focus_item
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self.pref_col = 0
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def _contents_modified(self) -> None:
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"""
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Recalculate whether this widget should be selectable whenever the
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contents has been changed.
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"""
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self._selectable = any(w.selectable() for w, o in self.contents)
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self._invalidate()
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def _validate_contents_modified(self, slc, new_items):
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for item in new_items:
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try:
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w, (t, n) = item
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if t not in (WHSettings.PACK, WHSettings.GIVEN, WHSettings.WEIGHT):
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raise PileError(f"added content invalid: {item!r}")
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except (TypeError, ValueError) as exc: # noqa: PERF203
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raise PileError(f"added content invalid: {item!r}").with_traceback(exc.__traceback__) from exc
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@property
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def widget_list(self):
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"""
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A list of the widgets in this Pile
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.. note:: only for backwards compatibility. You should use the new
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standard container property :attr:`contents`.
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"""
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warnings.warn(
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"only for backwards compatibility. You should use the new standard container property `contents`",
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PendingDeprecationWarning,
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stacklevel=2,
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)
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ml = MonitoredList(w for w, t in self.contents)
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def user_modified():
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self.widget_list = ml
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ml.set_modified_callback(user_modified)
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return ml
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@widget_list.setter
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def widget_list(self, widgets):
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focus_position = self.focus_position
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self.contents = [
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(new, options)
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for (new, (w, options)) in zip(
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widgets,
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# need to grow contents list if widgets is longer
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chain(self.contents, repeat((None, (WHSettings.WEIGHT, 1)))),
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)
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]
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if focus_position < len(widgets):
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self.focus_position = focus_position
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@property
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def item_types(self):
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"""
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A list of the options values for widgets in this Pile.
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.. note:: only for backwards compatibility. You should use the new
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standard container property :attr:`contents`.
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"""
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warnings.warn(
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"only for backwards compatibility. You should use the new standard container property `contents`",
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PendingDeprecationWarning,
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stacklevel=2,
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)
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ml = MonitoredList(
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# return the old item type names
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({WHSettings.GIVEN: Sizing.FIXED, WHSettings.PACK: Sizing.FLOW}.get(f, f), height)
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for w, (f, height) in self.contents
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)
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def user_modified():
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self.item_types = ml
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ml.set_modified_callback(user_modified)
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return ml
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@item_types.setter
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def item_types(self, item_types):
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warnings.warn(
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"only for backwards compatibility. You should use the new standard container property `contents`",
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PendingDeprecationWarning,
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stacklevel=2,
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)
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focus_position = self.focus_position
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self.contents = [
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(w, ({Sizing.FIXED: WHSettings.GIVEN, Sizing.FLOW: WHSettings.PACK}.get(new_t, new_t), new_height))
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for ((new_t, new_height), (w, options)) in zip(item_types, self.contents)
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]
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if focus_position < len(item_types):
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self.focus_position = focus_position
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@property
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def contents(self):
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"""
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The contents of this Pile as a list of (widget, options) tuples.
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options currently may be one of
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(``'pack'``, ``None``)
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allow widget to calculate its own height by calling its
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:meth:`rows <Widget.rows>` method, i.e. treat it as a flow widget.
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(``'given'``, *n*)
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Always treat widget as a box widget with a given height of *n* rows.
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(``'weight'``, *w*)
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If the Pile itself is treated as a box widget then
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the value *w* will be used as a relative weight for assigning rows
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to this box widget. If the Pile is being treated as a flow
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widget then this is the same as (``'pack'``, ``None``) and the *w*
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value is ignored.
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If the Pile itself is treated as a box widget then at least one
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widget must have a (``'weight'``, *w*) options value, or the Pile will
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not be able to grow to fill the required number of rows.
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This list may be modified like a normal list and the Pile widget
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will updated automatically.
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.. seealso:: Create new options tuples with the :meth:`options` method
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"""
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return self._contents
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@contents.setter
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def contents(self, c):
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self._contents[:] = c
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@staticmethod
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def options(
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height_type: Literal["pack", "given", "weight"] = WHSettings.WEIGHT,
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height_amount: int | None = 1,
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) -> tuple[Literal["pack"], None] | tuple[Literal["given", "weight"], int]:
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"""
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Return a new options tuple for use in a Pile's :attr:`contents` list.
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:param height_type: ``'pack'``, ``'given'`` or ``'weight'``
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:param height_amount: ``None`` for ``'pack'``, a number of rows for
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``'fixed'`` or a weight value (number) for ``'weight'``
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"""
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if height_type == WHSettings.PACK:
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return (WHSettings.PACK, None)
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if height_type not in (WHSettings.GIVEN, WHSettings.WEIGHT):
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raise PileError(f"invalid height_type: {height_type!r}")
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return (height_type, height_amount)
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@property
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def focus(self) -> Widget | None:
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"""the child widget in focus or None when Pile is empty"""
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if not self.contents:
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return None
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return self.contents[self.focus_position][0]
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@focus.setter
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def focus(self, item: Widget | int) -> None:
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"""
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Set the item in focus, for backwards compatibility.
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.. note:: only for backwards compatibility. You should use the new
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standard container property :attr:`focus_position`.
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to set the position by integer index instead.
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:param item: element to focus
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:type item: Widget or int
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"""
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if isinstance(item, int):
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self.focus_position = item
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return
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for i, (w, _options) in enumerate(self.contents):
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if item == w:
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self.focus_position = i
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return
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raise ValueError(f"Widget not found in Pile contents: {item!r}")
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def _get_focus(self) -> Widget:
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warnings.warn(
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f"method `{self.__class__.__name__}._get_focus` is deprecated, "
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f"please use `{self.__class__.__name__}.focus` property",
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DeprecationWarning,
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stacklevel=3,
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)
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if not self.contents:
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return None
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return self.contents[self.focus_position][0]
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def get_focus(self) -> Widget | None:
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"""
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Return the widget in focus, for backwards compatibility. You may
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also use the new standard container property .focus to get the
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child widget in focus.
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"""
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warnings.warn(
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"for backwards compatibility."
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"You may also use the new standard container property .focus to get the child widget in focus.",
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PendingDeprecationWarning,
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stacklevel=2,
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)
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if not self.contents:
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return None
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return self.contents[self.focus_position][0]
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def set_focus(self, item: Widget | int) -> None:
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warnings.warn(
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"for backwards compatibility."
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"You may also use the new standard container property .focus to get the child widget in focus.",
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PendingDeprecationWarning,
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stacklevel=2,
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)
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if isinstance(item, int):
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self.focus_position = item
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return
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for i, (w, _options) in enumerate(self.contents):
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if item == w:
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self.focus_position = i
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return
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raise ValueError(f"Widget not found in Pile contents: {item!r}")
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@property
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def focus_item(self):
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warnings.warn(
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"only for backwards compatibility."
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"You should use the new standard container properties "
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"`focus` and `focus_position` to get the child widget in focus or modify the focus position.",
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DeprecationWarning,
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stacklevel=2,
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)
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return self.focus
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@focus_item.setter
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def focus_item(self, new_item):
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warnings.warn(
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"only for backwards compatibility."
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"You should use the new standard container properties "
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"`focus` and `focus_position` to get the child widget in focus or modify the focus position.",
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DeprecationWarning,
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stacklevel=2,
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)
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self.focus = new_item
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@property
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def focus_position(self) -> int:
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"""
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index of child widget in focus.
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Raises :exc:`IndexError` if read when Pile is empty, or when set to an invalid index.
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"""
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if not self.contents:
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raise IndexError("No focus_position, Pile is empty")
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return self.contents.focus
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@focus_position.setter
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def focus_position(self, position: int) -> None:
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"""
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Set the widget in focus.
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position -- index of child widget to be made focus
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"""
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try:
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if position < 0 or position >= len(self.contents):
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raise IndexError(f"No Pile child widget at position {position}")
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except TypeError as exc:
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raise IndexError(f"No Pile child widget at position {position}").with_traceback(exc.__traceback__) from exc
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self.contents.focus = position
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def _get_focus_position(self) -> int | None:
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warnings.warn(
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f"method `{self.__class__.__name__}._get_focus_position` is deprecated, "
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f"please use `{self.__class__.__name__}.focus_position` property",
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DeprecationWarning,
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stacklevel=3,
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)
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if not self.contents:
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raise IndexError("No focus_position, Pile is empty")
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return self.contents.focus
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def _set_focus_position(self, position: int) -> None:
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"""
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Set the widget in focus.
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position -- index of child widget to be made focus
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"""
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warnings.warn(
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f"method `{self.__class__.__name__}._set_focus_position` is deprecated, "
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f"please use `{self.__class__.__name__}.focus_position` property",
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DeprecationWarning,
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stacklevel=3,
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)
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try:
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if position < 0 or position >= len(self.contents):
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raise IndexError(f"No Pile child widget at position {position}")
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except TypeError as exc:
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raise IndexError(f"No Pile child widget at position {position}").with_traceback(exc.__traceback__) from exc
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self.contents.focus = position
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def get_pref_col(self, size):
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"""Return the preferred column for the cursor, or None."""
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if not self.selectable():
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return None
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self._update_pref_col_from_focus(size)
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return self.pref_col
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def get_item_size(
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self,
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size: tuple[int] | tuple[int, int],
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i: int,
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focus: bool,
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item_rows: list[int] | None = None,
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) -> tuple[int] | tuple[int, int]:
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"""
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Return a size appropriate for passing to self.contents[i][0].render
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"""
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maxcol = size[0]
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w, (f, height) = self.contents[i]
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if f == WHSettings.GIVEN:
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return (maxcol, height)
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if f == WHSettings.WEIGHT and len(size) == 2:
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if not item_rows:
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item_rows = self.get_item_rows(size, focus)
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return (maxcol, item_rows[i])
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return (maxcol,)
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def get_item_rows(self, size: tuple[int] | tuple[int, int], focus: bool) -> list[int]:
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"""
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Return a list of the number of rows used by each widget
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in self.contents
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"""
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remaining = None
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maxcol = size[0]
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if len(size) == 2:
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remaining = size[1]
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rows_numbers = []
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if remaining is None:
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# pile is a flow widget
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for w, (f, height) in self.contents:
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if f == WHSettings.GIVEN:
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rows_numbers.append(height)
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else:
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rows_numbers.append(w.rows((maxcol,), focus=focus and self.focus == w))
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return rows_numbers
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# pile is a box widget
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# do an extra pass to calculate rows for each widget
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wtotal = 0
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for w, (f, height) in self.contents:
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if f == WHSettings.PACK:
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rows = w.rows((maxcol,), focus=focus and self.focus == w)
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rows_numbers.append(rows)
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remaining -= rows
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elif f == WHSettings.GIVEN:
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rows_numbers.append(height)
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remaining -= height
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elif height:
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rows_numbers.append(None)
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wtotal += height
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else:
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rows_numbers.append(0) # zero-weighted items treated as ('given', 0)
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if wtotal == 0:
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raise PileError("No weighted widgets found for Pile treated as a box widget")
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if remaining < 0:
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remaining = 0
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for i, (_w, (_f, height)) in enumerate(self.contents):
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li = rows_numbers[i]
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if li is None:
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rows = int(float(remaining) * height / wtotal + 0.5)
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rows_numbers[i] = rows
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remaining -= rows
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wtotal -= height
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return rows_numbers
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def render(self, size, focus=False):
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maxcol = size[0]
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item_rows = None
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combinelist = []
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for i, (w, (f, height)) in enumerate(self.contents):
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item_focus = self.focus == w
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canv = None
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if f == WHSettings.GIVEN:
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canv = w.render((maxcol, height), focus=focus and item_focus)
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elif f == WHSettings.PACK or len(size) == 1:
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canv = w.render((maxcol,), focus=focus and item_focus)
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else:
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if item_rows is None:
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item_rows = self.get_item_rows(size, focus)
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rows = item_rows[i]
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if rows > 0:
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canv = w.render((maxcol, rows), focus=focus and item_focus)
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if canv:
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combinelist.append((canv, i, item_focus))
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if not combinelist:
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return SolidCanvas(" ", size[0], (size[1:] + (0,))[0])
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out = CanvasCombine(combinelist)
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if len(size) == 2 and size[1] != out.rows():
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# flow/fixed widgets rendered too large/small
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out = CompositeCanvas(out)
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out.pad_trim_top_bottom(0, size[1] - out.rows())
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return out
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def get_cursor_coords(self, size: tuple[int] | tuple[int, int]) -> tuple[int, int] | None:
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"""Return the cursor coordinates of the focus widget."""
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if not self.selectable():
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return None
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if not hasattr(self.focus, "get_cursor_coords"):
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return None
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i = self.focus_position
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w, (f, height) = self.contents[i]
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item_rows = None
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maxcol = size[0]
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if f == WHSettings.GIVEN or (f == WHSettings.WEIGHT and len(size) == 2):
|
|
if f == WHSettings.GIVEN:
|
|
maxrow = height
|
|
else:
|
|
if item_rows is None:
|
|
item_rows = self.get_item_rows(size, focus=True)
|
|
maxrow = item_rows[i]
|
|
coords = self.focus.get_cursor_coords((maxcol, maxrow))
|
|
else:
|
|
coords = self.focus.get_cursor_coords((maxcol,))
|
|
|
|
if coords is None:
|
|
return None
|
|
x, y = coords
|
|
if i > 0:
|
|
if item_rows is None:
|
|
item_rows = self.get_item_rows(size, focus=True)
|
|
for r in item_rows[:i]:
|
|
y += r
|
|
return x, y
|
|
|
|
def rows(self, size: tuple[int] | tuple[int, int], focus: bool = False) -> int:
|
|
return sum(self.get_item_rows(size, focus))
|
|
|
|
def keypress(self, size: tuple[int] | tuple[int, int], key: str) -> str | None:
|
|
"""Pass the keypress to the widget in focus.
|
|
Unhandled 'up' and 'down' keys may cause a focus change."""
|
|
if not self.contents:
|
|
return key
|
|
|
|
item_rows = None
|
|
if len(size) == 2:
|
|
item_rows = self.get_item_rows(size, focus=True)
|
|
|
|
i = self.focus_position
|
|
if self.selectable():
|
|
tsize = self.get_item_size(size, i, True, item_rows)
|
|
key = self.focus.keypress(tsize, key)
|
|
if self._command_map[key] not in ("cursor up", "cursor down"):
|
|
return key
|
|
|
|
if self._command_map[key] == "cursor up":
|
|
candidates = list(range(i - 1, -1, -1)) # count backwards to 0
|
|
else: # self._command_map[key] == 'cursor down'
|
|
candidates = list(range(i + 1, len(self.contents)))
|
|
|
|
if not item_rows:
|
|
item_rows = self.get_item_rows(size, focus=True)
|
|
|
|
for j in candidates:
|
|
if not self.contents[j][0].selectable():
|
|
continue
|
|
|
|
self._update_pref_col_from_focus(size)
|
|
self.focus_position = j
|
|
if not hasattr(self.focus, "move_cursor_to_coords"):
|
|
return None
|
|
|
|
rows = item_rows[j]
|
|
if self._command_map[key] == "cursor up":
|
|
rowlist = list(range(rows - 1, -1, -1))
|
|
else: # self._command_map[key] == 'cursor down'
|
|
rowlist = list(range(rows))
|
|
for row in rowlist:
|
|
tsize = self.get_item_size(size, j, True, item_rows)
|
|
if self.focus.move_cursor_to_coords(tsize, self.pref_col, row):
|
|
break
|
|
return None
|
|
|
|
# nothing to select
|
|
return key
|
|
|
|
def _update_pref_col_from_focus(self, size: tuple[int] | tuple[int, int]) -> None:
|
|
"""Update self.pref_col from the focus widget."""
|
|
|
|
if not hasattr(self.focus, "get_pref_col"):
|
|
return
|
|
i = self.focus_position
|
|
tsize = self.get_item_size(size, i, True)
|
|
pref_col = self.focus.get_pref_col(tsize)
|
|
if pref_col is not None:
|
|
self.pref_col = pref_col
|
|
|
|
def move_cursor_to_coords(self, size: tuple[int] | tuple[int, int], col: int, row: int) -> bool:
|
|
"""Capture pref col and set new focus."""
|
|
self.pref_col = col
|
|
|
|
# FIXME guessing focus==True
|
|
focus = True
|
|
wrow = 0
|
|
item_rows = self.get_item_rows(size, focus)
|
|
for i, (r, w) in enumerate(zip(item_rows, (w for (w, options) in self.contents))): # noqa: B007
|
|
if wrow + r > row:
|
|
break
|
|
wrow += r
|
|
else:
|
|
return False
|
|
|
|
if not w.selectable():
|
|
return False
|
|
|
|
if hasattr(w, "move_cursor_to_coords"):
|
|
tsize = self.get_item_size(size, i, focus, item_rows)
|
|
rval = w.move_cursor_to_coords(tsize, col, row - wrow)
|
|
if rval is False:
|
|
return False
|
|
|
|
self.focus_position = i
|
|
return True
|
|
|
|
def mouse_event(
|
|
self,
|
|
size: tuple[int] | tuple[int, int],
|
|
event,
|
|
button: int,
|
|
col: int,
|
|
row: int,
|
|
focus: bool,
|
|
) -> bool | None:
|
|
"""
|
|
Pass the event to the contained widget.
|
|
May change focus on button 1 press.
|
|
"""
|
|
wrow = 0
|
|
item_rows = self.get_item_rows(size, focus)
|
|
for i, (r, w) in enumerate(zip(item_rows, (w for (w, options) in self.contents))): # noqa: B007
|
|
if wrow + r > row:
|
|
break
|
|
wrow += r
|
|
else:
|
|
return False
|
|
|
|
focus = focus and self.focus == w
|
|
if is_mouse_press(event) and button == 1 and w.selectable():
|
|
self.focus_position = i
|
|
|
|
if not hasattr(w, "mouse_event"):
|
|
return False
|
|
|
|
tsize = self.get_item_size(size, i, focus, item_rows)
|
|
return w.mouse_event(tsize, event, button, col, row - wrow, focus)
|