Python Kivy：如何给浮动按钮(FloatLayout)添加on_Release方法

发布于02月09日

我在屏幕上添加了一个FloatButton，但我无法将任何On_Release操作与其关联.我怀疑这个问题与以下事实有关:我的FloatButton实际上继承自FloatLayout，因此它没有ON_RELEASE属性？下面是我在KV文件中的FloatButton定义:

<FloatButton@FloatLayout>:
    id: float_add_button  # Giving id to button
    size_hint: (None, None)
    text: ''
    btn_size: (70, 70)
    size: (70, 70)
    bg_color: (0.404, 0.227, 0.718, 1.0)
    # pos_hint: {'x': .6}
 
    Button:
        text: float_add_button.text
        markup: True
        font_size: 40
        size_hint: (None, None)
        size: float_add_button.btn_size
        pos_hint: {'x': .5, 'y': .8} 
        background_normal: ''
        background_color: (0, 0, 0, 0)
        canvas.before:
            Color:
                rgba: (0.404, 0.227, 0.718, 1.0)
            Ellipse:
                size: self.size
                pos: self.pos

再往下看KV文件，我正在看_Release

<MainWindow>:
    name: 'main'

    RelativeLayout:
        orientation: 'lr-tb'
        size_hint: 1, 1
        padding: '20sp'
        canvas.before:
            Rectangle:
                pos: self.pos
                size: self.size

        # A few buttons here
        #
        #
        #

    FloatButton:
        id: addButton
        text: '+'
        markup: True
        background_color: 1, 0, 1, 0
        pos_hint: {"x":.5,"top":.5}
        on_release:
            print("[TEST] on_release works!")

但是，我得到以下错误:

 Traceback (most recent call last):
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\lang\builder.py", line 734, in _apply_rule 
     raise AttributeError(key)
 AttributeError: release

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "D:\Recipy_project\Recipy\main.py", line 1, in <module>
     from Recipy.app import Recipy
   File "D:\Recipy_project\Recipy\Recipy\app.py", line 21, in <module>
     kv = Builder.load_file("Recipy/ui/layout.kv")
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\lang\builder.py", line 310, in load_file   
     return self.load_string(data, **kwargs)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\lang\builder.py", line 412, in load_string 
     self._apply_rule(
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\lang\builder.py", line 665, in _apply_rule 
     child.apply_class_lang_rules(
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\uix\widget.py", line 470, in apply_class_lang_rules
     Builder.apply(
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\lang\builder.py", line 545, in apply       
     self._apply_rule(
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\lang\builder.py", line 741, in _apply_rule 
     raise BuilderException(
 kivy.lang.builder.BuilderException: Parser: File "D:\Recipy_project\Recipy\Recipy\ui\layout.kv", line 590:
 ...
     588:               pos_hint: {"x":.5,"top":.5}
     589:               on_release:
 >>  590:                       print("[TEST] on_release works!")
     591:                       # root.manager.transition.direction = "left"
     592:                       # app.root.current = 'add'
 ...
 AttributeError: release
   File "C:\Users\gitcanzo\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\kivy\lang\builder.py", line 734, in _apply_rule 
     raise AttributeError(key)

class FloatButton(FloatLayout): def __init__(self, *args, **kwargs): self.register_event_type('on_release') super().__init__(*args, **kwargs) def on_release(self, *args): pass

from kivy.app import App from kivy.lang import Builder from kivy.uix.floatlayout import FloatLayout kv = ''' <FloatButton@FloatLayout>: id: float_add_button # Giving id to button size_hint: (None, None) text: '' btn_size: (70, 70) size: (70, 70) bg_color: (0.404, 0.227, 0.718, 1.0) # pos_hint: {'x': .6} Button: on_release: root.dispatch('on_release') text: float_add_button.text markup: True font_size: 40 size_hint: (None, None) size: float_add_button.btn_size pos_hint: {'x': .5, 'y': .8} background_normal: '' background_color: (0, 0, 0, 0) canvas.before: Color: rgba: (0.404, 0.227, 0.718, 1.0) Ellipse: size: self.size pos: self.pos <MainWindow@RelativeLayout>: name: 'main' FloatButton: id: addButton text: '+' markup: True background_color: 1, 0, 1, 0 pos_hint: {"right":.5,"top":.5} on_release: print("[TEST] on_release works!") MainWindow: ''' class FloatButton(FloatLayout): def __init__(self, *args, **kwargs): self.register_event_type('on_release') super().__init__(*args, **kwargs) def on_release(self, *args): pass class MainWindow(App): def build(self): return Builder.load_string(kv) if __name__ == '__main__': MainWindow().run()

Python Kivy：如何给浮动按钮(FloatLayout)添加on_Release方法

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