Tkinter 画布 create_window() [英] Tkinter Canvas create_window()

问题描述

我正在尝试使用 Tkinter Canvas (self._canvas) 使用 create_window 函数创建窗口.该函数的 window 字段是一个 Tkinter Frame (self._tableFrame).有人可以帮助我如何使 self._tableFrame 自动扩展到 self._canvas 的大小(即使在用户更改窗口大小之后)?

I'm trying to use Tkinter Canvas (self._canvas) to create window using create_window function. The window field for that function is a Tkinter Frame (self._tableFrame). Can someone please help me out on how to make self._tableFrame to expand to size of self._canvas automatically (Even after the window size changed by user)?

代码:

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()

推荐答案

可以将 self._canvas 与事件 绑定，然后调用 itemconfig 将框架的 id 添加到画布(不是直接引用小部件):

You can bind self._canvas with the event <Configure>, and then call itemconfig with the id of the frame added to the canvas (not directly the reference to the widget):

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 语句，在我看来，这些语句非常重复并且非 Python 化:

By the way, I recommend you to rewrite your import statements, which in my opinion are quite repetitive and unpythonic:

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

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