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https://github.com/bec-project/bec_widgets.git
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97 lines
3.3 KiB
Python
97 lines
3.3 KiB
Python
from __future__ import annotations
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import darkdetect
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from bec_lib.logger import bec_logger
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from qtpy.QtCore import Slot
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from qtpy.QtWidgets import QApplication, QWidget
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from bec_widgets.utils.bec_connector import BECConnector, ConnectionConfig
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from bec_widgets.utils.colors import set_theme
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logger = bec_logger.logger
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class BECWidget(BECConnector):
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"""Mixin class for all BEC widgets, to handle cleanup"""
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# The icon name is the name of the icon in the icon theme, typically a name taken
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# from fonts.google.com/icons. Override this in subclasses to set the icon name.
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ICON_NAME = "widgets"
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def __init__(
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self,
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client=None,
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config: ConnectionConfig = None,
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gui_id: str = None,
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theme_update: bool = False,
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):
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"""
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Base class for all BEC widgets. This class should be used as a mixin class for all BEC widgets, e.g.:
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>>> class MyWidget(BECWidget, QWidget):
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>>> def __init__(self, parent=None, client=None, config=None, gui_id=None):
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>>> super().__init__(client=client, config=config, gui_id=gui_id)
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>>> QWidget.__init__(self, parent=parent)
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Args:
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client(BECClient, optional): The BEC client.
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config(ConnectionConfig, optional): The connection configuration.
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gui_id(str, optional): The GUI ID.
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theme_update(bool, optional): Whether to subscribe to theme updates. Defaults to False. When set to True, the
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widget's apply_theme method will be called when the theme changes.
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"""
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if not isinstance(self, QWidget):
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raise RuntimeError(f"{repr(self)} is not a subclass of QWidget")
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super().__init__(client=client, config=config, gui_id=gui_id)
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# Set the theme to auto if it is not set yet
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app = QApplication.instance()
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if not hasattr(app, "theme"):
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# DO NOT SET THE THEME TO AUTO! Otherwise, the qwebengineview will segfault
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# Instead, we will set the theme to the system setting on startup
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if darkdetect.isDark():
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set_theme("dark")
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else:
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set_theme("light")
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if theme_update:
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logger.debug(f"Subscribing to theme updates for {self.__class__.__name__}")
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self._connect_to_theme_change()
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def _connect_to_theme_change(self):
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"""Connect to the theme change signal."""
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qapp = QApplication.instance()
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if hasattr(qapp, "theme_signal"):
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qapp.theme_signal.theme_updated.connect(self._update_theme)
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def _update_theme(self, theme: str):
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"""Update the theme."""
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if theme is None:
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qapp = QApplication.instance()
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if hasattr(qapp, "theme"):
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theme = qapp.theme.theme
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else:
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theme = "dark"
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self.apply_theme(theme)
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@Slot(str)
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def apply_theme(self, theme: str):
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"""
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Apply the theme to the widget.
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Args:
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theme(str, optional): The theme to be applied.
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"""
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def cleanup(self):
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"""Cleanup the widget."""
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def closeEvent(self, event):
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self.rpc_register.remove_rpc(self)
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try:
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self.cleanup()
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finally:
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super().closeEvent(event)
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