from typing import Union, Tuple
import copy
import re
try:
from typing import Literal
except ImportError:
from typing_extensions import Literal
from .scaling_tracker import ScalingTracker
from ..font import CTkFont
class CTkScalingBaseClass:
"""
Super-class that manages the scaling values and callbacks.
Works for widgets and windows, type must be set in init method with
scaling_type attribute. Methods:
- _set_scaling() abstractmethod, gets called when scaling changes, must be overridden
- destroy() must be called when sub-class is destroyed
- _apply_widget_scaling()
- _reverse_widget_scaling()
- _apply_window_scaling()
- _reverse_window_scaling()
- _apply_font_scaling()
- _apply_argument_scaling()
- _apply_geometry_scaling()
- _reverse_geometry_scaling()
- _parse_geometry_string()
"""
def __init__(self, scaling_type: Literal["widget", "window"] = "widget"):
self.__scaling_type = scaling_type
if self.__scaling_type == "widget":
ScalingTracker.add_widget(self._set_scaling, self) # add callback for automatic scaling changes
self.__widget_scaling = ScalingTracker.get_widget_scaling(self)
elif self.__scaling_type == "window":
ScalingTracker.activate_high_dpi_awareness() # make process DPI aware
ScalingTracker.add_window(self._set_scaling, self) # add callback for automatic scaling changes
self.__window_scaling = ScalingTracker.get_window_scaling(self)
def destroy(self):
if self.__scaling_type == "widget":
ScalingTracker.remove_widget(self._set_scaling, self)
elif self.__scaling_type == "window":
ScalingTracker.remove_window(self._set_scaling, self)
def _set_scaling(self, new_widget_scaling, new_window_scaling):
""" can be overridden, but super method must be called at the beginning """
self.__widget_scaling = new_widget_scaling
self.__window_scaling = new_window_scaling
def _get_widget_scaling(self) -> float:
return self.__widget_scaling
def _get_window_scaling(self) -> float:
return self.__window_scaling
def _apply_widget_scaling(self, value: Union[int, float]) -> Union[float]:
assert self.__scaling_type == "widget"
return value * self.__widget_scaling
def _reverse_widget_scaling(self, value: Union[int, float]) -> Union[float]:
assert self.__scaling_type == "widget"
return value / self.__widget_scaling
def _apply_window_scaling(self, value: Union[int, float]) -> int:
assert self.__scaling_type == "window"
return int(value * self.__window_scaling)
def _reverse_window_scaling(self, scaled_value: Union[int, float]) -> int:
assert self.__scaling_type == "window"
return int(scaled_value / self.__window_scaling)
def _apply_font_scaling(self, font: Union[Tuple, CTkFont]) -> tuple:
""" Takes CTkFont object and returns tuple font with scaled size, has to be called again for every change of font object """
assert self.__scaling_type == "widget"
if type(font) == tuple:
if len(font) == 1:
return font
elif len(font) == 2:
return font[0], -abs(round(font[1] * self.__widget_scaling))
elif 3 <= len(font) <= 6:
return font[0], -abs(round(font[1] * self.__widget_scaling)), font[2:]
else:
raise ValueError(f"Can not scale font {font}. font needs to be tuple of len 1, 2 or 3")
elif isinstance(font, CTkFont):
return font.create_scaled_tuple(self.__widget_scaling)
else:
raise ValueError(f"Can not scale font '{font}' of type {type(font)}. font needs to be tuple or instance of CTkFont")
def _apply_argument_scaling(self, kwargs: dict) -> dict:
assert self.__scaling_type == "widget"
scaled_kwargs = copy.copy(kwargs)
# scale padding values
if "pady" in scaled_kwargs:
if isinstance(scaled_kwargs["pady"], (int, float)):
scaled_kwargs["pady"] = self._apply_widget_scaling(scaled_kwargs["pady"])
elif isinstance(scaled_kwargs["pady"], tuple):
scaled_kwargs["pady"] = tuple([self._apply_widget_scaling(v) for v in scaled_kwargs["pady"]])
if "padx" in kwargs:
if isinstance(scaled_kwargs["padx"], (int, float)):
scaled_kwargs["padx"] = self._apply_widget_scaling(scaled_kwargs["padx"])
elif isinstance(scaled_kwargs["padx"], tuple):
scaled_kwargs["padx"] = tuple([self._apply_widget_scaling(v) for v in scaled_kwargs["padx"]])
# scaled x, y values for place geometry manager
if "x" in scaled_kwargs:
scaled_kwargs["x"] = self._apply_widget_scaling(scaled_kwargs["x"])
if "y" in scaled_kwargs:
scaled_kwargs["y"] = self._apply_widget_scaling(scaled_kwargs["y"])
return scaled_kwargs
@staticmethod
def _parse_geometry_string(geometry_string: str) -> tuple:
# index: 1 2 3 4 5 6
# regex group structure: ('<width>x<height>', '<width>', '<height>', '+-<x>+-<y>', '-<x>', '-<y>')
result = re.search(r"((\d+)x(\d+)){0,1}(\+{0,1}([+-]{0,1}\d+)\+{0,1}([+-]{0,1}\d+)){0,1}", geometry_string)
width = int(result.group(2)) if result.group(2) is not None else None
height = int(result.group(3)) if result.group(3) is not None else None
x = int(result.group(5)) if result.group(5) is not None else None
y = int(result.group(6)) if result.group(6) is not None else None
return width, height, x, y
def _apply_geometry_scaling(self, geometry_string: str) -> str:
assert self.__scaling_type == "window"
width, height, x, y = self._parse_geometry_string(geometry_string)
if x is None and y is None: # no <x> and <y> in geometry_string
return f"{round(width * self.__window_scaling)}x{round(height * self.__window_scaling)}"
elif width is None and height is None: # no <width> and <height> in geometry_string
return f"+{x}+{y}"
else:
return f"{round(width * self.__window_scaling)}x{round(height * self.__window_scaling)}+{x}+{y}"
def _reverse_geometry_scaling(self, scaled_geometry_string: str) -> str:
assert self.__scaling_type == "window"
width, height, x, y = self._parse_geometry_string(scaled_geometry_string)
if x is None and y is None: # no <x> and <y> in geometry_string
return f"{round(width / self.__window_scaling)}x{round(height / self.__window_scaling)}"
elif width is None and height is None: # no <width> and <height> in geometry_string
return f"+{x}+{y}"
else:
return f"{round(width / self.__window_scaling)}x{round(height / self.__window_scaling)}+{x}+{y}"