Question

我知道这看起来像很多代码但是把它扔进python并运行它。你会立即看到问题，你会发现代码主要只是一个样式表。

我有一个黑框。其中一个名为“选择”的灰色框架占据了60％的高度和宽度。我想把一堆按钮放在灰框内。这些是从我创建的customButton类继承的自定义按钮。

然而，relx和依赖功能不正常。

from tkinter import *

root = Tk()
root.resizable(width=FALSE, height=FALSE)
root.geometry("1024x768")
root.config(background="black")

# The base class
class customButton(Label):
    def __init__(self, *args, **kwargs):
        Label.__init__(self, *args, **kwargs)
        self.config(
            background="black",   #background of just the button
            foreground="white"    #font color
        )

#The child class
class travelButton(customButton):
    def __init__(self, *args, **kwargs):        #All of this garbage is required just to
        super().__init__()                      #change the text
        self.config(text="Travel")              #dynamically

def loadSelections():
    selectionWindow = Label(root)
    # Selection Window
    selectionWindow.config(
        background="gray",
        foreground="white"
    )

    selectionWindow.place(
        relwidth=0.6,
        relheight=0.6,
        relx=0,
        rely=0
    )

    #What I've tried but doesn't work
    travel = travelButton(selectionWindow)
    travel.config(
        background="red",
        foreground="white",
        text="Travel button. The gray should be 50%, but Tkinter is being weird about inheritance."
    )

    travel.place(
        relwidth=0.5,
        relheight=0.5,
        relx=0,
        rely=0
    )

    #De-comment this and comment out the "travel" stuff above to see what is supposed to happen
    """
    greenTester = Label(selectionWindow)
    greenTester.config(
        background="green",
        foreground="white",
        text="This works, but doesn't let me take advantage of inheritance."
    )

    greenTester.place(
        relwidth=0.5,
        relheight=0.5,
        relx=0,
        rely=0
    )
    """
loadSelections()

我需要动态创建按钮，因此继承将是一个巨大的帮助。

Answer 1

您忘记使用*args, **kwargs而travelButton未通知Label谁是其父母。 Label不知道父级，因此它使用root作为父级。

你需要

class travelButton(customButton):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

或

 class travelButton(customButton):
    def __init__(self, *args, **kwargs):
        customButton.__init__(self, *args, **kwargs)

Tkinter基于继承改变行为

1 个答案: