我找到了一种不使用主题的方法.它不是那么复杂，但需要知识来使用它.

Light solution:

首先，我创建了3个大小均为16x16像素的图像.这个尺寸完全适合线条之间的分隔，但您可以将其更改为更适合您的尺寸.

Secondly, I am changing the default button image using 'element_create' (default is plus minus). This thing is called "indicator", it holds the images for this 'buttons'. Code should be simple then. 'image' is how folders looks like when closed (). 'user1' is when they are opened (). 'user2' is for an item in a folder (not a subfolder). I don't want it to show something, so I am using transparent image of size 1 pixel. Width and Height are to make indicator perfectly fit the image.

我还配置了Treeview.项，以便在左侧腾出额外的空间.不是真的需要.

最后，创建一个TreeView.因此，代码如下:

import tkinter as tk
from tkinter import ttk

root = tk.Tk()
style = ttk.Style()

# Images I will use (all have a size of 16 by 16 pixels):
images = {
    "folder_closed": tk.PhotoImage(file="folder1.png"),
    "empty": tk.PhotoImage(file="emptypixel.png"),
    "folder_opened": tk.PhotoImage(file="folder2.png")
}

"""
Treeview structure:
Treeview:   Treeview.field( Treeview.padding( Treeview.treearea))
Treeview.Heading:   Treeheading.cell; Treeheading.border( Treeheading.padding( Treeheading.image; Treeheading.text))
Treeview.Cell:   Treedata.padding( Treeitem.text)
Treeview.Item:   Treeitem.padding( Treeitem.indicator; Treeitem.image; Treeitem.text)
"""

style.element_create("Treeitem.indicator",
                     "image", images["folder_closed"],  # for a folder when it is 'closed'
                     ("user1", images['folder_opened']),  # when folder is opened
                     ("user2", images['empty']),  # for a file in a folder (not subfolder). By default same as folders
                     width=16, height=16)  # mine image sizes



style.configure('Treeview.Item', padding=(5, 0))  # may be omitted


# Create you tree!
treeview = ttk.Treeview(root, show='tree')

一个缺点是，这可能是有用的修复:该样式将用于所有的树视图在一个文件.这并不总是我们想要的.

complex solution:

我正在添加自定义样式.这是通过在物品和指示器上添加前缀‘Custom’(可以是任何名称)来实现的.这将继承默认的树元素."项目"的布局需要重新创建，因为应该添加新的指标，而不是默认的指标.所以代码是:

import tkinter as tk
from tkinter import ttk

root = tk.Tk()
style = ttk.Style()

# Images I will use (all have a size of 16 by 16 pixels):
images = {
    "folder_closed": tk.PhotoImage(file="folder1.png"),
    "empty": tk.PhotoImage(file="emptypixel.png"),
    "folder_opened": tk.PhotoImage(file="folder2.png")
}

# this is used to make extra scape from the icons of folders to the rest of the line.
imageToText_padx = 4

style.element_create("Custom.Treeview.indicator",
                     "image", images["folder_closed"],  # for a folder when it is 'closed'
                     ("user1", images['folder_opened']),  # when folder is opened
                     ("user2", images['empty']),  # for a file in a folder (not subfolder). By default same as folders
                     width=16 + imageToText_padx, height=16, sticky='wns')


style.layout("Custom.Treeview.Item", [
        ("Treeitem.padding", {"sticky": "nswe", "children":
            [
             ("Custom.Treeview.indicator", {"side": "left", "sticky": ""}),
             ("Treeitem.image", {"side": "left", "sticky": ""}),
             ("Treeitem.text", {"side": "left", "sticky": ""})
             ]
         })
    ])

style.configure('Custom.Treeview.Item', padding=(5, 0))  # may be omitted


# Apply the custom style to the treeview and create you tree!
treeview = ttk.Treeview(root, style='Custom.Treeview', show='tree')

这可以在一个程序中创建:

我还通过将"ELEMENT_CREATE"中的"Width"增加某个数字来增加文件夹图标和该行其余部分之间的间距.

总结:风格非常强大，如果你知道如何使用它们的话.这真的可以改变小工具的外观.不幸的是，它们没有得到很好的记录.