Tkinter Canvas create_window()

Question

我正在尝试使用Tkinter Canvas(self._canvas)来创建窗口使用create_window函数.该函数的窗口字段是Tkinter Frame(self._tableFrame).有人可以帮我解决如何自动self._tableFrame扩展到大小self._canvas(即使用户改变窗口大小后)？

码:

from Tkinter import Scrollbar as tkScrollBar
from Tkinter import Frame as tkFrame
from Tkinter import Canvas as tkCanvas
from Tkinter import Entry as tkEntry
from Tkinter import StringVar as tkStringVar
from Tkinter import Tk, HORIZONTAL, N, S, E, W, RIGHT, LEFT, BOTTOM, X, Y, BOTH
from Tkinter import TOP


class Widget(tkFrame):
    def __init__(self, master=None):
        tkFrame.__init__(self, master)

        self._str    = tkStringVar()
        self._widget = tkEntry(self)

        self._widget.config(textvariable=self._str, borderwidth=1, width=0)
        self._widget.pack(expand=True, fill=X)

    def settext(self, str_):
        self._str.set(str_)

    def gettext(self):
        return self._str.get()


class Application(tkFrame):
    def __init__(self, rows, cols, master=None):
        tkFrame.__init__(self, master)

        yScroll = tkScrollBar(self)
        xScroll = tkScrollBar(self, orient=HORIZONTAL)

        self._canvas = tkCanvas(self,
                yscrollcommand=yScroll.set, xscrollcommand=xScroll.set)
        yScroll.config(command=self._canvas.yview)
        xScroll.config(command=self._canvas.xview)

        self._table      = [[0 for x in range(rows)] for x in range(cols)]
        self._tableFrame = tkFrame(self._canvas)

        for col in range(cols):
            self._tableFrame.grid_columnconfigure(col, weight=1)
            for row in range(rows):
                self._table[row][col] = Widget(master=self._tableFrame)
                self._table[row][col].settext("(%d, %d)" % (row, col))
                self._table[row][col].grid(row=row, column=col, sticky=E+W)

        # For debugging
        self._canvas.config(background="blue")
        self._tableFrame.config(background="red")

        yScroll.pack(side=RIGHT, fill=Y)
        xScroll.pack(side=BOTTOM, fill=X)

        self._canvas.create_window(0, 0, window=self._tableFrame, anchor=N+W)
        self._canvas.pack(side=LEFT, fill=BOTH, expand=True)


tkRoot  = Tk()

# Application Size and Center the Application
appSize = (800, 600)
w       = tkRoot.winfo_screenwidth()
h       = tkRoot.winfo_screenheight()

x = w / 2 - appSize[0] / 2
y = h / 2 - appSize[1] / 2
tkRoot.geometry("%dx%d+%d+%d" % (appSize + (x, y)))
tkRoot.update_idletasks() # Force geometry update

app = Application(5, 5, master=tkRoot)
app.pack(side=TOP, fill=BOTH, expand=True)
tkRoot.mainloop()

Answer 1

您可以绑定self._canvas事件<Configure>,然后itemconfig使用添加到画布的框架的id 调用(而不是直接调用窗口小部件):

def __init__(self, rows, cols, master=None):
    # ...
    self._frame_id = self._canvas.create_window(0, 0, window=self._tableFrame, anchor=N+W)
    self._canvas.pack(side=LEFT, fill=BOTH, expand=True)
    self._canvas.bind("<Configure>", self.resize_frame)

def resize_frame(self, e):
    self._canvas.itemconfig(self._frame_id, height=e.height, width=e.width)

顺便说一句,我建议你重写你的import陈述,在我看来这是非常重复和单一的:

import Tkinter as tk
# Use tk.Tk, tk.Canvas, etc.