Tkinter 画布 create_window()答案

【问题标题】：Tkinter Canvas create_window()Tkinter 画布 create_window()
【发布时间】：2013-05-25 02:31:00
【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 Tkinter Frame (self._tableFrame)。有人可以帮我解决如何使self._tableFrame 自动扩展到self._canvas 的大小（即使在用户更改了窗口大小之后）？

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()

【问题讨论】：

标签： python python-2.7 tkinter tkinter-canvas

【解决方案1】：

您可以将self._canvas 与事件<Configure> 绑定，然后调用itemconfig 并将框架的ID 添加到画布（而不是直接引用小部件）：

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 语句，在我看来这是相当重复和unpythonic：

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

【讨论】：