Question

我正在学习tkinter，并创建了一个简单的转换器。我已经创建了一个画布，并将所有遗物放在上面。我的主窗口是800x640，画布是400x320。完成后，我想使用grid命令并找到我喜欢的画布位置。但是，当我执行canvas.grid（row = rownr，column = columnnr）时，无论我在grid方法中给出row和col的值是多少，画布都将转到主窗口的row = 0，column = 0。如果我在主窗口的（0,0）处添加了另一个小部件（例如标签），则尝试将画布移至（0,1），然后画布移至该位置。但是，如果画布是我主窗口中唯一的窗口小部件，则使用网格方法根本不会移动。请帮助我理解为什么会这样。这是完整的代码：

from tkinter import *
from tkinter.ttk import *
from tkinter import messagebox
from tkinter import Menu


def convert_meters():
    # get value from entry and convert it to all
    result_in_meters = int(label1_1.get())# integer value
    result_in_km.set(float(result_in_meters/1000))
    result_in_dem.set(float(result_in_meters*10))
    result_in_miles.set(float(result_in_meters*0.000621371))
    result_in_yards.set(float(result_in_meters*1.09361))


def get_value_and_convert():
    if(combo1.get()=="meters"):
        convert_meters()
    elif(combo1.get()=="centimeters"):
        convert_centimeters()
    elif(combo1.get()=="millimeters"):
        convert_millimeters()
    elif(combo1.get()=="inches"):
        convert_inches()
    else:
        result_in_km.set("0")
        result_in_dem.set("0")
        result_in_miles.set("0")
        result_in_yards.set("0")

window = Tk()
window.title("Converter")
result = IntVar()

result_in_km = StringVar()
result_in_dem = StringVar()
result_in_miles = StringVar()
result_in_yards = StringVar()

canvas1 = Canvas(window, width=400, height=320, bd=1, highlightthickness=1, relief='ridge')
canvas1.grid(row=2, column=2)

#### Things to convert #####
label1 = Label(canvas1, text="Convert ", width=8)
label1_1 = Entry(canvas1, width=2) # between label1 and combobox
combo1 = Combobox(canvas1, width=8)
combo1['values'] = ("meters","centimeters","millimeters","inches")
combo1.current(0)
label2 = Label(canvas1, text=" to:", width=10)
############################

#### Convert to: ####
label3 = Label(canvas1, text="Km: ", width=10)
label4 = Label(canvas1, text="Dem: ", width=10)
label5 = Label(canvas1, text="Miles: ", width=10)
label6 = Label(canvas1, text="Yards: ", width=10)
#####################

#### Displaying labels ####
display1 = Label(canvas1, textvariable=result_in_km, width=40, relief=SUNKEN)
display2 = Label(canvas1, textvariable=result_in_dem, width=40, relief=SUNKEN)
display3 = Label(canvas1, textvariable=result_in_miles, width=40, relief=SUNKEN)
display4 = Label(canvas1, textvariable=result_in_yards, width=40, relief=SUNKEN)
###########################

#### The convert button ####
convert_button = Button(canvas1, width=40, text="Convert", command=get_value_and_convert)
############################

label1_window = canvas1.create_window(100, 10, anchor=NW, window=label1)
label1_1_window = canvas1.create_window(160, 10, anchor=NW, window=label1_1)
combo1_window = canvas1.create_window(200, 10, anchor=NW, window=combo1)
label2_window = canvas1.create_window(300, 10, anchor=NW, window=label2)

label3_window = canvas1.create_window(10, 80, anchor=NW, window=label3)
display1_window = canvas1.create_window(60, 80, anchor=NW, window=display1)

label4_window = canvas1.create_window(10, 120, anchor=NW, window=label4)
display2_window = canvas1.create_window(60, 120, anchor=NW, window=display2)

label5_window = canvas1.create_window(10, 160, anchor=NW, window=label5)
display3_window = canvas1.create_window(60, 160, anchor=NW, window=display3)


label6_window = canvas1.create_window(10, 200, anchor=NW, window=label6)
display4_window = canvas1.create_window(60, 200, anchor=NW, window=display4)

display5_window = canvas1.create_window(50, 250, anchor=NW, window=convert_button)


window.geometry('800x640')


window.mainloop()

这是我尝试使用网格定位画布的行（在声明画布之后就正确了）：

canvas1.grid(row=2, column=2)

感谢您的阅读！

Answer 1

空的行和列的大小为0。

如果只想移动画布，则可以使用填充：

from tkinter import *

window = Tk()
window.geometry('800x640')

canvas1 = Canvas(window, width=400, height=320, bd=1,
                 highlightthickness=1, relief='ridge', bg='khaki')
canvas1.grid(row=2, column=2, padx=50, pady=100)

window.mainloop()

Tkinter-无法在主窗口上移动画布

1 个答案: