python - 使用包几何自动隐藏 Tkinter Canvas 滚动条

Question

我需要有关在不需要时自动隐藏 tkinter 滚动条的帮助。我从 effbot.org 找到了自动隐藏滚动条的代码，但仅限于网格几何。在我的案例中，我没有使用网格几何。这是我的代码。

import Tkinter as tk
from Tkinter import *
import tkFont


class AutoScrollbar(Scrollbar):
    # a scrollbar that hides itself if it's not needed.  only
    # works if you use the grid geometry manager.
    def set(self, lo, hi):
        if float(lo) <= 0.0 and float(hi) >= 1.0:
            # grid_remove is currently missing from Tkinter!
            self.tk.call("grid", "remove", self)
        else:
            self.grid()
        Scrollbar.set(self, lo, hi)
    def pack(self, **kw):
        raise TclError, "cannot use pack with this widget"
    def place(self, **kw):
        raise TclError, "cannot use place with this widget"


class MainWindow(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        w = 1200
        h = 650
        x = self.winfo_screenwidth()/2 - w/2
        y = self.winfo_screenheight()/2 - h/2
        self.geometry("%ix%i+%i+%i" % (w, h, x, y))

        self.mainTopFrame = Frame(self, height=75)
        self.mainTopFrame.pack(side=TOP, fill=X)
        self.canvas = Canvas(self, borderwidth=0, bg='#ffffff')
        self.mainBottomFrame = Frame(self.canvas, bg='#000000')
        self.yscroll = Scrollbar(self.canvas, orient=VERTICAL, command=self.canvas.yview)
        self.canvas.configure(yscrollcommand=self.yscroll.set)
        self.canvas.pack(side=TOP, fill=BOTH, expand=1)
        self.yscroll.pack(side=RIGHT, fill=Y)
        self.canvas.create_window((4,4), window=self.mainBottomFrame, anchor=NW)
        self.mainBottomFrame.bind("<Configure>", self.onFrameConfigure)
        self.menuFrame = Frame(self.mainTopFrame, bg='#545454')
        self.menuFrame.pack(side=TOP, fill=BOTH, expand=True)

        self.container = Frame(self.mainBottomFrame)
        self.container.pack(side=TOP, fill=BOTH, expand=True)
        self.frames = {}
        for F in (MonitorPage, PlanPage, DataLogPage, HelpPage):
            self.frame = F(self.container, self)
            self.frames[F] = self.frame
            self.frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame(MonitorPage)

    def show_frame(self, cont):
        self.frame = self.frames[cont]
        self.frame.tkraise()

    def onFrameConfigure(self, event):
        '''Reset the scroll region to encompass the inner frame'''
        self.canvas.configure(scrollregion=self.canvas.bbox("all"))

class AutoScrollbar(Scrollbar):
    # a scrollbar that hides itself if it's not needed.  only
    # works if you use the grid geometry manager.
    def set(self, lo, hi):
        if float(lo) <= 0.0 and float(hi) >= 1.0:
            # grid_remove is currently missing from Tkinter!
            self.tk.call("grid", "remove", self)
        else:
            self.grid()
        Scrollbar.set(self, lo, hi)
    def pack(self, **kw):
        raise TclError, "cannot use pack with this widget"
    def place(self, **kw):
        raise TclError, "cannot use place with this widget"

class MonitorPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)


        self.labelFont = tkFont.Font(family="Fixedsys", size=15, weight=tkFont.BOLD)


        self.leftFrame0 = Frame(self, bg='#888888')
        self.leftFrame0.pack(side=LEFT, fill=BOTH)
        self.rightFrame0 = Frame(self, bg='#888888')
        self.rightFrame0.pack(side=RIGHT, fill=BOTH)
        self.upLftFrame0 = Frame(self.leftFrame0)
        self.upLftFrame0.pack(side=TOP, fill=BOTH, padx=10, pady=10)
        self.dnLftFrame0 = Frame(self.leftFrame0)
        self.dnLftFrame0.pack(side=BOTTOM, fill=BOTH, padx=10, pady=10)
        self.upLftLblFrame0 = tk.LabelFrame(self.upLftFrame0)
        self.upLftLblFrame0.pack(side=TOP, fill=BOTH, padx=5, pady=5)
        self.dnLftLblFrame0 = tk.LabelFrame(self.dnLftFrame0)
        self.dnLftLblFrame0.pack(side=BOTTOM, fill=BOTH, padx=5, pady=5)
        self.rtLblFrame0 = tk.LabelFrame(self.rightFrame0)
        self.rtLblFrame0.pack(side=TOP, fill=BOTH, padx=10, pady=10)



        self.label0 = Label(self.rtLblFrame0, height=40, width=70)
        self.label0.pack()
        self.label1 = Label(self.upLftLblFrame0, height=25, width=115)
        self.label1.pack()
        self.label2 = Label(self.dnLftLblFrame0, height=10, width=115)
        self.label2.pack()


class PlanPage(tk.Frame, MainWindow):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)

class DataLogPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)

class HelpPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)


if __name__ == '__main__':
    rungui = MainWindow()
    rungui.mainloop()

因此，即使我正在使用包几何体，我也想自动隐藏滚动条。我希望我把我的问题说清楚了。我对 python 和 tkinter 很陌生。

Answer 1

我将 effbot.org 中的示例改编为 pack 方法:

from Tkinter import *

class AutoScrollbar(Scrollbar):
    # a scrollbar that hides itself if it's not needed.  only
    # works if you use the grid geometry manager.
    def set(self, lo, hi):
        if float(lo) <= 0.0 and float(hi) >= 1.0:
            # grid_remove is currently missing from Tkinter!
            self.pack_forget()
        else:
            if self.cget("orient") == HORIZONTAL:
                self.pack(fill=X)
            else:
                self.pack(fill=Y)
        Scrollbar.set(self, lo, hi)
    def grid(self, **kw):
        raise TclError, "cannot use grid with this widget"
    def place(self, **kw):
        raise TclError, "cannot use place with this widget"

# create scrolled canvas

root = Tk()

hscrollbar = AutoScrollbar(root, orient=HORIZONTAL)
canvas = Canvas(root,
                xscrollcommand=hscrollbar.set)
canvas.pack(side=TOP, fill=BOTH, expand=True)
hscrollbar.pack()

hscrollbar.config(command=canvas.xview)

# make the canvas expandable
root.grid_rowconfigure(0, weight=1)
root.grid_columnconfigure(0, weight=1)

# create canvas contents

frame = Frame(canvas)
frame.rowconfigure(1, weight=1)
frame.columnconfigure(1, weight=1)

rows = 5
for i in range(1,rows):
    for j in range(1,10):
        button = Button(frame, padx=7, pady=7, text="[%d,%d]" % (i,j))
        button.grid(row=i, column=j, sticky='news')

canvas.create_window(0, 0, anchor=NW, window=frame)

frame.update_idletasks()

canvas.config(scrollregion=canvas.bbox("all"))

root.mainloop()