在kivy中将一个函数绑定到多个动态创建的按钮？
在kivy中将一个函数绑定到多个动态创建的按钮？
提问于 2017-08-29 16:40:53
问题
我想创建多个按钮，并将它们绑定到一个函数。问题是，每当我单击一个按钮时，该函数就会被多次调用。这似乎是事件连接的问题。当我查看当我按下一个按钮时调用该函数的实例时，似乎该函数同时从每个按钮被调用？！
KV代码：
...
# This is the button that I'am using
<ProjectSelectButton>:
height: 35
background_color: 0,0,1,1
on_touch_down: self.click_on_button(args[0], args[1])
...
# The buttons are added to this grid
ButtonsPlacedHere@GridLayout:
id: active_projects
cols: 1
size_hint_y: None
height: self.minimum_height
spacing: 1
...Python代码：
...
class ProjectSelectButton(Button):
def click_on_button(self, instance, touch, *args):
print(instance)
if touch.button == 'right':
print(self.id, "right mouse clicked")
else touch.buttom == 'left':
print(self.id, "left mouse clicked")
...
# The part of my programm that creates the buttons
# projects is a dictionary
for key, project in data_manager.resource_pool.projects.items():
print(project.project_name)
button= ProjectSelectButton(text=project.project_name, id=key, size_hint_y=None)
# Bind without KV-File (same result)
# label.bind(on_touch_up=self.click_on_button)
ids.active_projects.add_widget(button)输出示例：
当我点击一个按钮时，我得到了什么！
<guiMain.ProjectSelectButton object at 0x0BA34260>
ID01 right mouse clicked
<guiMain.ProjectSelectButton object at 0x0BA34260>
ID01 right mouse clicked
<guiMain.ProjectSelectButton object at 0x0BA28F10>
ID02 right mouse clicked
<guiMain.ProjectSelectButton object at 0x0BA28F10>
ID02 right mouse clicked
<guiMain.ProjectSelectButton object at 0x0BA22C00>
ID03 right mouse clicked
<guiMain.ProjectSelectButton object at 0x0BA22C00>
ID03 right mouse clicked例如，当我按下ID为01的按钮时，我想要什么：
<guiMain.ProjectSelectButton object at 0x0BA34260>
ID01 right mouse clicked问题
如何创建多个按钮，当它们被按下时将调用单个函数？
回答 1
Stack Overflow用户
回答已采纳
发布于 2017-08-29 23:05:31
Programming Guide » Input management » Touch events
默认情况下，触摸事件被分派到当前显示的所有小部件。这意味着无论触摸事件是否发生在它们的物理区域内，小部件都会收到它。
为了提供最大的灵活性，Kivy将事件分派到所有小部件，并让它们决定如何对它们做出反应。如果您只想响应小部件中的触摸事件，只需检查。
解决方案
在click_on_button方法中使用self.collide_point方法。当它发生冲突时，你应该只得到一个按钮。请参考我的示例了解详细信息。
代码片段
class ProjectSelectButton(Button):
def click_on_button(self, instance, touch, *args):
print(instance)
if self.collide_point(*touch.pos):
if touch.button == 'right':
print(self.id, "right mouse clicked")
elif touch.buttom == 'left':
print(self.id, "left mouse clicked")
return True
return super(ProjectSelectButton, self).on_touch_down(touch)示例
main.py
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
class CreateButton(Button):
def on_touch_down(self, touch):
if self.collide_point(*touch.pos):
if touch.button == "right":
print(self.id, "right mouse clicked")
elif touch.button == "left":
print(self.id, "left mouse clicked")
else:
print(self.id)
return True
return super(CreateButton, self).on_touch_down(touch)
class OnTouchDownDemo(GridLayout):
def __init__(self, **kwargs):
super(OnTouchDownDemo, self).__init__(**kwargs)
self.build_board()
def build_board(self):
# make 9 buttons in a grid
for i in range(0, 9):
button = CreateButton(id=str(i))
self.add_widget(button)
class OnTouchDownApp(App):
def build(self):
return OnTouchDownDemo()
if __name__ == '__main__':
OnTouchDownApp().run()ontouchdown.kv
#:kivy 1.10.0
<CreateButton>:
font_size: 50
on_touch_down: self.on_touch_down
<OnTouchDownDemo>:
rows: 3
cols: 3
row_force_default: True
row_default_height: 150
col_force_default: True
col_default_width: 150
padding: [10]
spacing: [10]页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/45934429
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