我怎么能在Tkinter中使用滚动条获得一个Frame？

Question

我希望有一个Frame,用户可以根据应用程序的需要添加任意数量的文本字段.

应用程序以文本字段和该文本字段下方的按钮开始.当用户按下按钮时,将在第一个下方添加新的文本条目(这可以重复无数次).在窗口中间,会有一个Text小部件,用于显示文本:)

但是,我在文档中注意到了这一点:

This widget is used to implement scrolled listboxes, canvases, and text fields.

有没有办法使用的一种方法Scrollbar用Frame？

Answer 1

如果你可以使用Tix,那么ScrolledWindow小部件有一个windowFrame和一个或两个Scrollbar小部件:

import Tix as tk

r= tk.Tk()
r.title("test scrolled window")
sw= tk.ScrolledWindow(r, scrollbar=tk.Y) # just the vertical scrollbar
sw.pack(fill=tk.BOTH, expand=1)
for i in xrange(10):
    e= tk.Entry(sw.window)
    e.pack()
r.mainloop()

更改根窗口的大小.您将需要向Entry小部件的focus_get事件添加代码,以便在通过键盘进行跳转时滚动ScrolledWindow.

否则,您将不得不使用Canvas小部件(您可以添加Label,Entry和Text子小部件)并自己编写更多代码来实现所需的功能.

Answer 2

下面是一个例子自动隐藏滚动条,如果你只是使用,只有工作网格几何管理器,从所拍摄的effbot.org文档:

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.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")


# create scrolled canvas

root = Tk()

vscrollbar = AutoScrollbar(root)
vscrollbar.grid(row=0, column=1, sticky=N+S)
hscrollbar = AutoScrollbar(root, orient=HORIZONTAL)
hscrollbar.grid(row=1, column=0, sticky=E+W)

canvas = Canvas(root, yscrollcommand=vscrollbar.set, xscrollcommand=hscrollbar.set)
canvas.grid(row=0, column=0, sticky=N+S+E+W)

vscrollbar.config(command=canvas.yview)
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, 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()