32 lines
1.0 KiB
Python
32 lines
1.0 KiB
Python
import gi
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gi.require_version("GObject", "2.0")
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from gi.repository import GObject
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class Binding(GObject.Object):
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def __init__(self, emitter: GObject.GObject, property: str | None = None, transform_fn = lambda x: x):
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self.emitter = emitter
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self.property = property
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self.transform_fn = transform_fn
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def get(self):
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return self.transform_fn(self.emitter.get_property(self.property) if self.property else self.emitter.get())
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def transform(self, fn):
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return Binding(self.emitter, self.property, lambda x: fn(self.transform_fn(x)))
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def subscribe(self, callback):
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id = self.emitter.connect(
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f'notify::{self.property}' if self.property else 'changed',
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lambda gobject, _=None: callback(self.transform_fn(self.emitter.get_property(self.property) if self.property else self.emitter.get()))
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)
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def unsubscribe(_=None):
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self.emitter.disconnect(id)
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return unsubscribe
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def bind(*args, **kwargs):
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return Binding(*args, **kwargs)
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