如何更改 kivy python 中树视图的背景颜色？

Question

I need help in changing the background color of the treeview on kivy.

I am working on the kivy framework in python that will list some labels.

But what happens while executing the application is, my apps background color is white and the tree-view gets the background-color from the application background.

Below is the sample-screenshot

Sample Code: To create tree view.

list_label=TreeView(root_options=dict(text='My root label'),hide_root=False)
list_label.add_node(TreeViewLabel(text='My first item'))

Answer 1

Add the following to your .py :

Builder.load_string('''
<TreeView>:
    canvas.before:
        Color:
            rgba: 1, 0, 0, 1
        Rectangle:
            pos: self.pos
            size: self.size

''')

This changes the background to red. You can replace 1, 0, 0, 1 with any color you prefer.

Answer 2

EDIT: I kind of answered the wrong question, my solution below changes the color of the even/odd nodes which overlay the background. I'll leave it here in case it's helpful.

Original Answer:

There are a couple ways to skin this cat. The easiest is to use the even_color and odd_color properties of the TreeViewNode widget. Here's how you would use that in your case:

list_label=TreeView(root_options=dict(text='My root label'),hide_root=False)
list_label.add_node(TreeViewLabel(text='My first item', \
even_color=[0.5,0.1,0.1,1],odd_color=[0.1,0.1,0.5,1]))

It would definitely be more DRY to create your own custom widget which is equally easy:

from kivy.uix.treeview import TreeViewLabel
from kivy.uix.button import Button

class MyTreeViewLabel(Button, TreeViewLabel):
   def __init__(self, **kwargs):
      super(MyTreeViewLabel, self).__init__(**kwargs)
      self.even_color = [0.5,0.1,0.1,1]
      self.odd_color = [0.1,0.1,0.5,1]

Then, your code would just be:

list_label=TreeView(root_options=dict(text='My root label'),hide_root=False)
list_label.add_node(MyTreeViewLabel(text='My first item'))