SyncTk/classes/custom/scrollable_frame.py

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from tkinter import E, N, NSEW, S, Canvas, Event, ttk
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from classes.custom.themed_frame import ThemedFrame
FIT_WIDTH = "fit_width"
FIT_HEIGHT = "fit_height"
class ScrollableFrame(ThemedFrame):
"""
There is no way to scroll <tkinter.Frame> so we are
going to create a canvas and place the frame there.
Scrolling the canvas will give the illusion of scrolling
the frame
Partly taken from:
https://blog.tecladocode.com/tkinter-scrollable-frames/
https://stackoverflow.com/a/17457843/11106801
master_frame---------------------------------------------------------
| dummy_canvas----------------------------------------- y_scroll-- |
| | self--------------------------------------------- | | | |
| | | | | | | |
| | | | | | | |
| | | | | | | |
| | ------------------------------------------------ | | | |
| ---------------------------------------------------- --------- |
| x_scroll--------------------------------------------- |
| | | |
| ---------------------------------------------------- |
--------------------------------------------------------------------
"""
def __init__(self, master=None, scroll_speed:int=2, hscroll:bool=False, vscroll:bool=True, scrollbar_kwargs={}, **kwargs):
assert isinstance(scroll_speed, int), "`scroll_speed` must be an int"
self.scroll_speed = scroll_speed
self.master_frame = ThemedFrame(master)
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# self.master_frame["borderwidth"] = 1
# self.master_frame["relief"] = "solid"
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self.master_frame.grid_rowconfigure(0, weight=1)
self.master_frame.grid_columnconfigure(0, weight=1)
self.dummy_canvas = Canvas(self.master_frame, highlightthickness=0, **kwargs)
super().__init__(self.dummy_canvas)
# Create the 2 scrollbars
if vscroll:
self.v_scrollbar = ttk.Scrollbar(self.master_frame, orient="vertical", command=self.dummy_canvas.yview, **scrollbar_kwargs)
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self.v_scrollbar.grid(row=0, column=1, sticky=N+S+E)
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self.dummy_canvas.configure(yscrollcommand=self.v_scrollbar.set)
if hscroll:
self.h_scrollbar = ttk.Scrollbar(self.master_frame, orient="horizontal", command=self.dummy_canvas.xview, **scrollbar_kwargs)
self.h_scrollbar.grid(row=1, column=0, sticky=NSEW)
self.dummy_canvas.configure(xscrollcommand=self.h_scrollbar.set)
# Bind to the mousewheel scrolling
self.dummy_canvas.bind_all("<MouseWheel>", self.scrolling_windows, add=True)
self.dummy_canvas.bind_all("<Button-4>", self.scrolling_linux, add=True)
self.dummy_canvas.bind_all("<Button-5>", self.scrolling_linux, add=True)
self.bind("<Configure>", self.scrollbar_scrolling, add=True)
# Place `self` inside `dummy_canvas`
self.dummy_canvas.create_window((0, 0), window=self, anchor="nw")
# Place `dummy_canvas` inside `master_frame`
self.dummy_canvas.grid(row=0, column=0, sticky=NSEW)
self.pack = self.master_frame.pack
self.grid = self.master_frame.grid
self.place = self.master_frame.place
self.pack_forget = self.master_frame.pack_forget
self.grid_forget = self.master_frame.grid_forget
self.place_forget = self.master_frame.place_forget
def scrolling_windows(self, event:Event) -> None:
assert event.delta != 0, "On Windows, `event.delta` should never be 0"
y_steps = int(-event.delta/abs(event.delta)*self.scroll_speed)
self.dummy_canvas.yview_scroll(y_steps, "units")
def scrolling_linux(self, event:Event) -> None:
y_steps = self.scroll_speed
if event.num == 4:
y_steps *= -1
self.dummy_canvas.yview_scroll(y_steps, "units")
def scrollbar_scrolling(self, event:Event) -> None:
region = list(self.dummy_canvas.bbox("all"))
region[2] = max(self.dummy_canvas.winfo_width(), region[2])
region[3] = max(self.dummy_canvas.winfo_height(), region[3])
self.dummy_canvas.configure(scrollregion=region)
def resize(self, fit:str=None, height:int=None, width:int=None) -> None:
"""
Resizes the frame to fit the widgets inside. You must either
specify (the `fit`) or (the `height` or/and the `width`) parameter.
Parameters:
fit:str `fit` can be either `FIT_WIDTH` or `FIT_HEIGHT`.
`FIT_WIDTH` makes sure that the frame's width can
fit all of the widgets. `FIT_HEIGHT` is simmilar
height:int specifies the height of the frame in pixels
width:int specifies the width of the frame in pixels
To do:
ALWAYS_FIT_WIDTH
ALWAYS_FIT_HEIGHT
"""
if height is not None:
self.dummy_canvas.config(height=height)
if width is not None:
self.dummy_canvas.config(width=width)
if fit == FIT_WIDTH:
super().update()
self.dummy_canvas.config(width=super().winfo_width())
elif fit == FIT_HEIGHT:
super().update()
self.dummy_canvas.config(height=super().winfo_height())
else:
raise ValueError("Unknow value for the `fit` parameter.")
fit = resize
# import tkinter as tk
# from tkinter import ttk
# from classes.custom.themed_frame import ThemedFrame
# class ScrollableFrame(ThemedFrame):
# def __init__(self, container, *args, **kwargs):
# super().__init__(container, *args, **kwargs)
# self.canvas = tk.Canvas(self)
# scrollbar = ttk.Scrollbar(self, orient="vertical", command=self.canvas.yview)
# self.canvas.bind_all("<MouseWheel>", self._on_mousewheel)
# self.scrollable_frame = ThemedFrame(self.canvas)
# self.scrollable_frame.bind(
# "<Configure>",
# lambda e: self.canvas.configure(
# scrollregion=self.canvas.bbox("all")
# )
# )
# self.canvas.create_window((0, 0), window=self.scrollable_frame, anchor="nw")
# self.canvas.configure(yscrollcommand=scrollbar.set)
# self.canvas.pack(side="left", fill="both", expand=True)
# scrollbar.pack(side="right", fill="y")
# def _on_mousewheel(self, event):
# shift = (event.state & 0x1) != 0
# scroll = -1 if event.delta > 0 else 1
# if shift:
# self.canvas.xview_scroll(scroll, "units")
# else:
# self.canvas.yview_scroll(scroll, "units")