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fixed scrollbar for horizontal orientation

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Tom Schimansky
2022-06-23 17:41:12 +02:00
parent a7b175ae65
commit ec3fdc40ff
3 changed files with 58 additions and 23 deletions
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58
customtkinter/widgets/ctk_scrollbar.py
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@ -1,7 +1,5 @@
import sys
import tkinter
from .ctk_frame import CTkFrame
from .ctk_canvas import CTkCanvas
from ..theme_manager import ThemeManager
from ..draw_engine import DrawEngine
@ -18,6 +16,7 @@ class CTkScrollbar(CTkBaseClass):
corner_radius="default_theme",
width=None,
height=None,
minimum_pixel_length=20,
orientation="vertical",
command=None,
hover=True,
@ -30,10 +29,10 @@ class CTkScrollbar(CTkBaseClass):
else:
width = 200
if height is None:
if orientation.lower() == "vertical":
height = 200
else:
if orientation.lower() == "horizontal":
height = 16
else:
height = 200
# transfer basic functionality (bg_color, size, _appearance_mode, scaling) to CTkBaseClass
super().__init__(*args, bg_color=bg_color, width=width, height=height, **kwargs)
@ -53,6 +52,7 @@ class CTkScrollbar(CTkBaseClass):
self.orientation = orientation
self.start_value: float = 0 # 0 to 1
self.end_value: float = 1 # 0 to 1
self.minimum_pixel_length = minimum_pixel_length
self.canvas = CTkCanvas(master=self,
highlightthickness=0,
@ -83,12 +83,38 @@ class CTkScrollbar(CTkBaseClass):
height=self.apply_widget_scaling(self._desired_height))
self.draw(no_color_updates=True)
def get_scrollbar_values_for_minimum_pixel_size(self):
# correct scrollbar float values if scrollbar is too small
if self.orientation == "vertical":
scrollbar_pixel_length = (self.end_value - self.start_value) * self._current_height
if scrollbar_pixel_length < self.minimum_pixel_length and -scrollbar_pixel_length + self._current_height != 0:
# calculate how much to increase the float interval values so that the scrollbar width is self.minimum_pixel_length
interval_extend_factor = (-scrollbar_pixel_length + self.minimum_pixel_length) / (-scrollbar_pixel_length + self._current_height)
corrected_end_value = self.end_value + (1 - self.end_value) * interval_extend_factor
corrected_start_value = self.start_value - self.start_value * interval_extend_factor
return corrected_start_value, corrected_end_value
else:
return self.start_value, self.end_value
else:
scrollbar_pixel_length = (self.end_value - self.start_value) * self._current_width
if scrollbar_pixel_length < self.minimum_pixel_length and -scrollbar_pixel_length + self._current_width != 0:
# calculate how much to increase the float interval values so that the scrollbar width is self.minimum_pixel_length
interval_extend_factor = (-scrollbar_pixel_length + self.minimum_pixel_length) / (-scrollbar_pixel_length + self._current_width)
corrected_end_value = self.end_value + (1 - self.end_value) * interval_extend_factor
corrected_start_value = self.start_value - self.start_value * interval_extend_factor
return corrected_start_value, corrected_end_value
else:
return self.start_value, self.end_value
def draw(self, no_color_updates=False):
corrected_start_value, corrected_end_value = self.get_scrollbar_values_for_minimum_pixel_size()
requires_recoloring = self.draw_engine.draw_rounded_scrollbar(self.apply_widget_scaling(self._current_width),
self.apply_widget_scaling(self._current_height),
self.apply_widget_scaling(self.corner_radius),
self.apply_widget_scaling(self.border_spacing),
self.start_value, self.end_value,
corrected_start_value,
corrected_end_value,
self.orientation)
if no_color_updates is False or requires_recoloring:
@ -102,10 +128,12 @@ class CTkScrollbar(CTkBaseClass):
outline=ThemeManager.single_color(self.scrollbar_color, self._appearance_mode))
if self.fg_color is None:
self.canvas.configure(bg=ThemeManager.single_color(self.bg_color, self._appearance_mode))
self.canvas.itemconfig("border_parts",
fill=ThemeManager.single_color(self.bg_color, self._appearance_mode),
outline=ThemeManager.single_color(self.bg_color, self._appearance_mode))
else:
self.canvas.configure(bg=ThemeManager.single_color(self.fg_color, self._appearance_mode))
self.canvas.itemconfig("border_parts",
fill=ThemeManager.single_color(self.fg_color, self._appearance_mode),
outline=ThemeManager.single_color(self.fg_color, self._appearance_mode))
@ -115,7 +143,6 @@ class CTkScrollbar(CTkBaseClass):
def set(self, start_value: float, end_value: float):
self.start_value = float(start_value)
self.end_value = float(end_value)
self.scrollbar_height = self.end_value - self.start_value
self.draw()
def get(self):
@ -190,14 +217,17 @@ class CTkScrollbar(CTkBaseClass):
def clicked(self, event):
if self.orientation == "vertical":
value = ((event.y - self.border_spacing) / (self._current_height - 2 * self.border_spacing)) / self._widget_scaling
current_scrollbar_length = self.end_value - self.start_value
value = max(current_scrollbar_length / 2, min(value, 1 - (current_scrollbar_length / 2)))
self.start_value = value - (current_scrollbar_length / 2)
self.end_value = value + (current_scrollbar_length / 2)
self.draw()
else:
value = ((event.x - self.border_spacing) / (self._current_width - 2 * self.border_spacing)) / self._widget_scaling
if self.command is not None:
self.command('moveto', self.start_value)
current_scrollbar_length = self.end_value - self.start_value
value = max(current_scrollbar_length / 2, min(value, 1 - (current_scrollbar_length / 2)))
self.start_value = value - (current_scrollbar_length / 2)
self.end_value = value + (current_scrollbar_length / 2)
self.draw()
if self.command is not None:
self.command('moveto', self.start_value)
def mouse_scroll_event(self, event=None):
if self.command is not None: