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282 lines
14 KiB
282 lines
14 KiB
2 years ago
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import sys
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from typing import Union, Tuple, Callable, Optional
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from .core_rendering import CTkCanvas
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from .theme import ThemeManager
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from .core_rendering import DrawEngine
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from .core_widget_classes import CTkBaseClass
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class CTkScrollbar(CTkBaseClass):
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"""
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Scrollbar with rounded corners, configurable spacing.
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Connect to scrollable widget by passing .set() method and set command attribute.
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For detailed information check out the documentation.
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"""
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def __init__(self,
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master: any,
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width: Optional[Union[int, str]] = None,
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height: Optional[Union[int, str]] = None,
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corner_radius: Optional[int] = None,
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border_spacing: Optional[int] = None,
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minimum_pixel_length: int = 20,
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bg_color: Union[str, Tuple[str, str]] = "transparent",
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fg_color: Optional[Union[str, Tuple[str, str]]] = None,
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button_color: Optional[Union[str, Tuple[str, str]]] = None,
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button_hover_color: Optional[Union[str, Tuple[str, str]]] = None,
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hover: bool = True,
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command: Union[Callable, None] = None,
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orientation: str = "vertical",
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**kwargs):
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# set default dimensions according to orientation
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if width is None:
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if orientation.lower() == "vertical":
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width = 16
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else:
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width = 200
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if height is None:
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if orientation.lower() == "horizontal":
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height = 16
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else:
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height = 200
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# transfer basic functionality (_bg_color, size, __appearance_mode, scaling) to CTkBaseClass
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super().__init__(master=master, bg_color=bg_color, width=width, height=height, **kwargs)
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# color
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self._fg_color = ThemeManager.theme["CTkScrollbar"]["fg_color"] if fg_color is None else self._check_color_type(fg_color, transparency=True)
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self._button_color = ThemeManager.theme["CTkScrollbar"]["button_color"] if button_color is None else self._check_color_type(button_color)
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self._button_hover_color = ThemeManager.theme["CTkScrollbar"]["button_hover_color"] if button_hover_color is None else self._check_color_type(button_hover_color)
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# shape
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self._corner_radius = ThemeManager.theme["CTkScrollbar"]["corner_radius"] if corner_radius is None else corner_radius
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self._border_spacing = ThemeManager.theme["CTkScrollbar"]["border_spacing"] if border_spacing is None else border_spacing
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self._hover = hover
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self._hover_state: bool = False
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self._command = command
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self._orientation = orientation
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self._start_value: float = 0 # 0 to 1
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self._end_value: float = 1 # 0 to 1
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self._minimum_pixel_length = minimum_pixel_length
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self._canvas = CTkCanvas(master=self,
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highlightthickness=0,
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width=self._apply_widget_scaling(self._current_width),
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height=self._apply_widget_scaling(self._current_height))
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self._canvas.place(x=0, y=0, relwidth=1, relheight=1)
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self._draw_engine = DrawEngine(self._canvas)
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self._create_bindings()
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self._draw()
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def _create_bindings(self, sequence: Optional[str] = None):
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""" set necessary bindings for functionality of widget, will overwrite other bindings """
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if sequence is None:
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self._canvas.tag_bind("border_parts", "<Button-1>", self._clicked)
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if sequence is None or sequence == "<Enter>":
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self._canvas.bind("<Enter>", self._on_enter)
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if sequence is None or sequence == "<Leave>":
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self._canvas.bind("<Leave>", self._on_leave)
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if sequence is None or sequence == "<B1-Motion>":
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self._canvas.bind("<B1-Motion>", self._clicked)
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if sequence is None or sequence == "<MouseWheel>":
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self._canvas.bind("<MouseWheel>", self._mouse_scroll_event)
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def _set_scaling(self, *args, **kwargs):
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super()._set_scaling(*args, **kwargs)
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self._canvas.configure(width=self._apply_widget_scaling(self._desired_width),
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height=self._apply_widget_scaling(self._desired_height))
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self._draw(no_color_updates=True)
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def _set_dimensions(self, width=None, height=None):
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super()._set_dimensions(width, height)
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self._canvas.configure(width=self._apply_widget_scaling(self._desired_width),
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height=self._apply_widget_scaling(self._desired_height))
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self._draw(no_color_updates=True)
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def _get_scrollbar_values_for_minimum_pixel_size(self):
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# correct scrollbar float values if scrollbar is too small
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if self._orientation == "vertical":
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scrollbar_pixel_length = (self._end_value - self._start_value) * self._current_height
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if scrollbar_pixel_length < self._minimum_pixel_length and -scrollbar_pixel_length + self._current_height != 0:
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# calculate how much to increase the float interval values so that the scrollbar width is self.minimum_pixel_length
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interval_extend_factor = (-scrollbar_pixel_length + self._minimum_pixel_length) / (-scrollbar_pixel_length + self._current_height)
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corrected_end_value = self._end_value + (1 - self._end_value) * interval_extend_factor
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corrected_start_value = self._start_value - self._start_value * interval_extend_factor
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return corrected_start_value, corrected_end_value
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else:
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return self._start_value, self._end_value
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else:
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scrollbar_pixel_length = (self._end_value - self._start_value) * self._current_width
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if scrollbar_pixel_length < self._minimum_pixel_length and -scrollbar_pixel_length + self._current_width != 0:
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# calculate how much to increase the float interval values so that the scrollbar width is self.minimum_pixel_length
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interval_extend_factor = (-scrollbar_pixel_length + self._minimum_pixel_length) / (-scrollbar_pixel_length + self._current_width)
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corrected_end_value = self._end_value + (1 - self._end_value) * interval_extend_factor
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corrected_start_value = self._start_value - self._start_value * interval_extend_factor
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return corrected_start_value, corrected_end_value
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else:
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return self._start_value, self._end_value
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def _draw(self, no_color_updates=False):
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super()._draw(no_color_updates)
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corrected_start_value, corrected_end_value = self._get_scrollbar_values_for_minimum_pixel_size()
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requires_recoloring = self._draw_engine.draw_rounded_scrollbar(self._apply_widget_scaling(self._current_width),
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self._apply_widget_scaling(self._current_height),
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self._apply_widget_scaling(self._corner_radius),
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self._apply_widget_scaling(self._border_spacing),
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corrected_start_value,
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corrected_end_value,
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self._orientation)
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if no_color_updates is False or requires_recoloring:
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if self._hover_state is True:
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self._canvas.itemconfig("scrollbar_parts",
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fill=self._apply_appearance_mode(self._button_hover_color),
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outline=self._apply_appearance_mode(self._button_hover_color))
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else:
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self._canvas.itemconfig("scrollbar_parts",
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fill=self._apply_appearance_mode(self._button_color),
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outline=self._apply_appearance_mode(self._button_color))
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if self._fg_color == "transparent":
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self._canvas.configure(bg=self._apply_appearance_mode(self._bg_color))
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self._canvas.itemconfig("border_parts",
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fill=self._apply_appearance_mode(self._bg_color),
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outline=self._apply_appearance_mode(self._bg_color))
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else:
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self._canvas.configure(bg=self._apply_appearance_mode(self._fg_color))
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self._canvas.itemconfig("border_parts",
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fill=self._apply_appearance_mode(self._fg_color),
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outline=self._apply_appearance_mode(self._fg_color))
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self._canvas.update_idletasks()
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def configure(self, require_redraw=False, **kwargs):
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if "fg_color" in kwargs:
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self._fg_color = self._check_color_type(kwargs.pop("fg_color"), transparency=True)
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require_redraw = True
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if "button_color" in kwargs:
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self._button_color = self._check_color_type(kwargs.pop("button_color"))
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require_redraw = True
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if "button_hover_color" in kwargs:
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self._button_hover_color = self._check_color_type(kwargs.pop("button_hover_color"))
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require_redraw = True
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if "hover" in kwargs:
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self._hover = kwargs.pop("hover")
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if "command" in kwargs:
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self._command = kwargs.pop("command")
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if "corner_radius" in kwargs:
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self._corner_radius = kwargs.pop("corner_radius")
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require_redraw = True
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if "border_spacing" in kwargs:
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self._border_spacing = kwargs.pop("border_spacing")
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require_redraw = True
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super().configure(require_redraw=require_redraw, **kwargs)
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def cget(self, attribute_name: str) -> any:
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if attribute_name == "corner_radius":
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return self._corner_radius
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elif attribute_name == "border_spacing":
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return self._border_spacing
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elif attribute_name == "minimum_pixel_length":
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return self._minimum_pixel_length
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elif attribute_name == "fg_color":
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return self._fg_color
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elif attribute_name == "scrollbar_color":
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return self._button_color
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elif attribute_name == "scrollbar_hover_color":
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return self._button_hover_color
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elif attribute_name == "hover":
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return self._hover
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elif attribute_name == "command":
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return self._command
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elif attribute_name == "orientation":
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return self._orientation
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else:
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return super().cget(attribute_name)
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def _on_enter(self, event=0):
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if self._hover is True:
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self._hover_state = True
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self._canvas.itemconfig("scrollbar_parts",
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outline=self._apply_appearance_mode(self._button_hover_color),
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fill=self._apply_appearance_mode(self._button_hover_color))
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def _on_leave(self, event=0):
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self._hover_state = False
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self._canvas.itemconfig("scrollbar_parts",
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outline=self._apply_appearance_mode(self._button_color),
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fill=self._apply_appearance_mode(self._button_color))
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def _clicked(self, event):
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if self._orientation == "vertical":
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value = self._reverse_widget_scaling(((event.y - self._border_spacing) / (self._current_height - 2 * self._border_spacing)))
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else:
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value = self._reverse_widget_scaling(((event.x - self._border_spacing) / (self._current_width - 2 * self._border_spacing)))
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current_scrollbar_length = self._end_value - self._start_value
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value = max(current_scrollbar_length / 2, min(value, 1 - (current_scrollbar_length / 2)))
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self._start_value = value - (current_scrollbar_length / 2)
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self._end_value = value + (current_scrollbar_length / 2)
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self._draw()
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if self._command is not None:
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self._command('moveto', self._start_value)
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def _mouse_scroll_event(self, event=None):
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if self._command is not None:
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if sys.platform.startswith("win"):
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self._command('scroll', -int(event.delta/40), 'units')
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else:
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self._command('scroll', -event.delta, 'units')
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def set(self, start_value: float, end_value: float):
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self._start_value = float(start_value)
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self._end_value = float(end_value)
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self._draw()
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def get(self):
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return self._start_value, self._end_value
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def bind(self, sequence=None, command=None, add=True):
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""" called on the tkinter.Canvas """
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if not (add == "+" or add is True):
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raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
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self._canvas.bind(sequence, command, add=True)
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def unbind(self, sequence=None, funcid=None):
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""" called on the tkinter.Canvas, restores internal callbacks """
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if funcid is not None:
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raise ValueError("'funcid' argument can only be None, because there is a bug in" +
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" tkinter and its not clear whether the internal callbacks will be unbinded or not")
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self._canvas.unbind(sequence, None) # unbind all callbacks for sequence
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self._create_bindings(sequence=sequence) # restore internal callbacks for sequence
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def focus(self):
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return self._canvas.focus()
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def focus_set(self):
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return self._canvas.focus_set()
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def focus_force(self):
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return self._canvas.focus_force()
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