OS: Windows 10 22H2 19045.4239 Windows Feature Experience Pack 120.2212.3030.0 64
Kivy: v2.3.0
Kivy installation method: pip
Describe the bug
A clear and concise description of what the bug is.
BUG in ScrollView, ScrollView added before will repeatedly bind on_scroll_stop event, ScrollView added after the event does not trigger events, no event is bound before the addition
Expected behavior
A clear and concise description of what you expected to happen.
Events that are not bound in the previous ScrollView are not fired
To Reproduce
A short, runnable example that reproduces the issue with latest kivy master.
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.uix.scrollview import ScrollView
class IndexScreen(Screen):
def __init__(self, **kwargs):
super(IndexScreen, self).__init__(**kwargs)
self.init_layout()
def init_layout(self):
"""初始化屏幕布局"""
try:
self.layout = BoxLayout(orientation='vertical')
# 假设header、middle、button方法分别用于添加头部、中间内容和按钮区域的组件
self.add_header()
self.add_middle()
self.add_button()
self.add_widget(self.layout)
except Exception as e:
# 在实际应用中应该有更具体的异常处理
print(f"布局初始化出错: {e}")
def add_header(self):
"""添加头部组件"""
self.topBoxLayout = BoxLayout(orientation='horizontal', size_hint_y=0.3, padding=[0, 0, 0, 2])
header_scrollview = ScrollView(size_hint=(1, 1))
header_inner_layout = BoxLayout(orientation='horizontal', size_hint=(None, 1), spacing=10, padding=[0, 0, 0, 3])
header_inner_layout.bind(minimum_width=header_inner_layout.setter('width'))
# 方案一：
for i in range(10):
topButton = Button(text=f'topButton{i}', size_hint_x=None, width=200,
halign='center', valign='center')
header_inner_layout.add_widget(topButton)
header_scrollview.add_widget(header_inner_layout)
self.topBoxLayout.add_widget(header_scrollview)
self.layout.add_widget(self.topBoxLayout)
def add_middle(self):
self.left_scroll_box = BoxLayout(orientation='vertical', size_hint_x=0.3, padding=[0, 0, 1, 0])
left_scrollview = ScrollView(size_hint=(1, 1))
left_inner_layout = BoxLayout(orientation='vertical', size_hint=(1, None), spacing=5, padding=[0, 0, 3, 0])
left_inner_layout.bind(minimum_height=left_inner_layout.setter('height'))
for i in range(13):
middleButton = Button(text=f'leftButton{i}', size_hint_y=None, background_color=(0.8, 0.95, 0.75, 0.8))
left_inner_layout.add_widget(middleButton)
left_scrollview.add_widget(left_inner_layout)
def on_scroll_stop(instance, value):
scroll_y = instance.scroll_y
content_height = instance.viewport_size[1]
scroll_view_height = instance.height
max_scroll_range = content_height - scroll_view_height
if max_scroll_range > 0:
real_value = scroll_y * max_scroll_range
print("Real value:", real_value)
if real_value <= 0:
# 在这里添加你要执行的操作，例如：
print("Scroll to top or nearly top, consider adding labels or similar actions.")
else:
print("Max scroll range is negative or zero, real value calculation skipped.")
left_scrollview.bind(
on_scroll_stop=on_scroll_stop)
self.left_scroll_box.add_widget(left_scrollview)
self.layout.add_widget(self.left_scroll_box)
def add_button(self):
"""添加按钮区域"""
self.bottomBoxLayout = BoxLayout(orientation='vertical', size_hint_y=0.2, padding=[0, 1, 0, 2])
bottom_scrollview = ScrollView(size_hint=(1, 1))
bottom_inner_layout = BoxLayout(orientation='horizontal', size_hint=(None, 1), spacing=10, padding=[0, 3, 0, 3])
bottom_inner_layout.bind(minimum_width=bottom_inner_layout.setter('width'))
for i in range(3):
buttomButton = Button(text=f'bottomButton{i}', size_hint_x=None, width=200)
bottom_inner_layout.add_widget(buttomButton)
bottom_scrollview.add_widget(bottom_inner_layout)
self.bottomBoxLayout.add_widget(bottom_scrollview)
self.layout.add_widget(self.bottomBoxLayout)
class ScrollApp(App):
def build(self):
Window.clearcolor = (1, 1, 1, 1)
return IndexScreen()
if __name__ == "__main__":
ScrollApp().run()
Software Versions
Describe the bug A clear and concise description of what the bug is. BUG in ScrollView, ScrollView added before will repeatedly bind on_scroll_stop event, ScrollView added after the event does not trigger events, no event is bound before the addition
Expected behavior A clear and concise description of what you expected to happen. Events that are not bound in the previous ScrollView are not fired
To Reproduce A short, runnable example that reproduces the issue with latest kivy master.
LOG INFO