python tkinter 无法在 canvas 上实现 lift 方法

Question

我正在尝试在 Python Tkinter 中提升和降低 canvas 对象。我试过 canvas.lower() 但它导致错误提示

_tkinter.TclError:wrong # args: should be ".!canvas lower tag0rld "belowThis?

我的脚本：

import tkinter as tk
import PIL.ImageTk as itk
window=tk.Tk()
image1=itk.PhotoImage(file=“image_1.png")
canvas1 = tk.Canvas(window)
a=canvas1.create_image(0,0,image=image1)
canvas1.place(x=100,y=100)
canvas1.lower()
image2 = itk.PhotoImage(file=“image_2.png")
canvas2 = tk.Canvas(window)
b = canvas2.create_image(0,0,image=image2)
canvas2.place(x=100,y=130)
window.mainloop()

图像只是一个黑色方块和一个白色方块，所以它们无关紧要。

Answer 1

整体降低canvas:

import tkinter as tk

import tkinter as tk

window = tk.Tk()
canvas1 = tk.Canvas(window, bg="red")
canvas1.place(x=100,y=100)

canvas2 = tk.Canvas(window, bg="blue")
canvas2.place(x=100,y=130)

canvas2.tk.call('lower', canvas2._w, None)

window.mainloop()

root.mainloop()

这直接调用了 tcl 命令，但仍然有效。问题是在 tkinter.Canvas:

的定义中

class Canvas(Widget, XView, YView):
    ...
    def tag_lower(self, *args):
        """Lower an item TAGORID given in ARGS
        (optional below another item)."""
        self.tk.call((self._w, 'lower') + args)
    lower = tag_lower

它覆盖了降低小部件的 Misc class（所有小部件的基础 class）方法 .lower。所以我直接调用了 Misc class 会调用的内容：self.tk.call('lower', self._w, belowThis)

python tkinter 无法在 canvas 上实现 lift 方法

python tkinter cannot implement lift method on canvas

python

tkinter

tkinter-canvas