100 lines
4.5 KiB
Python
100 lines
4.5 KiB
Python
from typing import Any, Callable, Optional, cast
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from typing_extensions import Self
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from ...binding import BindableProperty, bind, bind_from, bind_to
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from ...element import Element
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class LabelElement(Element):
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label = BindableProperty(
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on_change=lambda sender, label: cast(Self, sender)._handle_label_change(label)) # pylint: disable=protected-access
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def __init__(self, *, label: Optional[str], **kwargs: Any) -> None:
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super().__init__(**kwargs)
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self.label = label
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if label is not None:
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self._props['label'] = label
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def bind_label_to(self,
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target_object: Any,
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target_name: str = 'label',
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forward: Optional[Callable[[Any], Any]] = None, *,
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strict: Optional[bool] = None,
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) -> Self:
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"""Bind the label of this element to the target object's target_name property.
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The binding works one way only, from this element to the target.
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The update happens immediately and whenever a value changes.
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:param target_object: The object to bind to.
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:param target_name: The name of the property to bind to.
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:param forward: A function to apply to the value before applying it to the target (default: identity).
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:param strict: Whether to check (and raise) if the target object has the specified property (default: None,
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performs a check if the object is not a dictionary, *added in version 3.0.0*).
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"""
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bind_to(self, 'label', target_object, target_name, forward, self_strict=False, other_strict=strict)
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return self
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def bind_label_from(self,
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target_object: Any,
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target_name: str = 'label',
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backward: Optional[Callable[[Any], Any]] = None, *,
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strict: Optional[bool] = None,
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) -> Self:
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"""Bind the label of this element from the target object's target_name property.
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The binding works one way only, from the target to this element.
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The update happens immediately and whenever a value changes.
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:param target_object: The object to bind from.
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:param target_name: The name of the property to bind from.
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:param backward: A function to apply to the value before applying it to this element (default: identity).
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:param strict: Whether to check (and raise) if the target object has the specified property (default: None,
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performs a check if the object is not a dictionary, *added in version 3.0.0*).
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"""
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bind_from(self, 'label', target_object, target_name, backward, self_strict=False, other_strict=strict)
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return self
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def bind_label(self,
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target_object: Any,
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target_name: str = 'label', *,
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forward: Optional[Callable[[Any], Any]] = None,
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backward: Optional[Callable[[Any], Any]] = None,
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strict: Optional[bool] = None,
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) -> Self:
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"""Bind the label of this element to the target object's target_name property.
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The binding works both ways, from this element to the target and from the target to this element.
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The update happens immediately and whenever a value changes.
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The backward binding takes precedence for the initial synchronization.
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:param target_object: The object to bind to.
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:param target_name: The name of the property to bind to.
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:param forward: A function to apply to the value before applying it to the target (default: identity).
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:param backward: A function to apply to the value before applying it to this element (default: identity).
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:param strict: Whether to check (and raise) if the target object has the specified property (default: None,
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performs a check if the object is not a dictionary, *added in version 3.0.0*).
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"""
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bind(self, 'label', target_object, target_name,
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forward=forward, backward=backward,
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self_strict=False, other_strict=strict)
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return self
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def set_label(self, label: Optional[str]) -> None:
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"""Set the label of this element.
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:param label: The new label.
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"""
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self.label = label
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def _handle_label_change(self, label: Optional[str]) -> None:
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"""Called when the label of this element changes.
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:param label: The new label.
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"""
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if label is None:
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del self._props['label']
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else:
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self._props['label'] = label
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