[英]Kivy How to create widgets from dictionary in kivy
我是Python的kivy新手。 我找到了额外的库kivy-md,它具有非常好看的ui元素。 目前我想从字典变量创建许多MDTextField小部件,例如
# text_fields.py
text_fields = {
"text_field1": {
"key": 0,
"self": "text_field1",
"hint_text": "Textfield 1",
"helper_text": "This is textfield 1",
},
"text_field2": {
"key": 1,
"self": "text_field2",
"hint_text": "Textfield 2",
"helper_text": "This is textfield 2",
}
}
从这个变量,我想在kv文件中创建看起来像的小部件
GridLayout:
MDTextField:
id: text_field1
hint_text: text_fields["text_field1"]["hint_text"]
helper_text: text_fields["text_field1"]["helper_text"]
helper_text_mode: "on_focus"
on_text_validate: app.on_text_validate(text_fields["text_field1"]["self"])
MDTextField:
id: text_field2
hint_text: text_fields["text_field2"]["hint_text"]
helper_text: text_fields["text_field2"]["helper_text"]
helper_text_mode: "on_focus"
on_text_validate: app.on_text_validate(text_fields["text_field2"]["self"])
我看到这个问题有两个我无法解决的挑战。 第一个是如何解析字典字符串中的id值,第二个问题是我不知道如何在kv文件中循环kivy小部件。
有没有办法实现我想要的?
请注意,KivyMD MDTextField中没有属性, self
和key
。 在示例中,我们使用嵌套for
循环来访问字典text_fields.py
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivymd.textfields import MDTextField
from kivymd.theming import ThemeManager
from text_fields import text_fields
from functools import partial
class RootWidget(GridLayout):
def __init__(self, **kwargs):
super(RootWidget, self).__init__(**kwargs)
self.cols = 1
app = App.get_running_app()
for key, fields in text_fields.items():
mdt = MDTextField(id=key, helper_text_mode="on_focus")
for subfield, value in fields.items():
mdt.subfield = str(value)
mdt.bind(on_text_validate=partial(app.on_text_validate, text_fields[key]["self"]))
self.add_widget(mdt)
class MainApp(App):
title = "KivyMD MDTextField Demo"
theme_cls = ThemeManager()
def build(self):
return RootWidget()
def on_text_validate(self, value, obj):
print("\napp.on_text_validate:")
print("\tobj=", obj)
print("\tvalue=", value)
print("\tobj.text=", obj.text)
if __name__ == "__main__":
MainApp().run()
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