应用pos_hint后获取小部件XY位置
应用pos_hint后获取小部件XY位置
提问于 2013-08-04 11:34:27
使用pos_hint定位小部件(例如分散)之后，如何获得当前的x，y位置(pos)？
例如：
wid.pos = (250, 350)
print wid.pos <----- # it print (200, 350). Correct.
wid.pos_hint = {'top':0.9, 'right':0.5} # moved the widget to other position using pos_hint.
print wid.pos <----- # it sill print (200, 350) eventhough the widget position has changed.编辑：示例代码
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.scatter import Scatter
Builder.load_string("""
<Icon@Scatter>:
size_hint: .06, .08
Image:
size: root.size
allow_stretch: True
keep_ratio: True
""")
class Icon(Scatter):
def __init__(self, **kwargs):
self.pos = (200, 200)
self.move()
super(Icon, self).__init__(**kwargs)
def move(self):
print "BEFORE: "
print self.pos # print 200, 200
self.pos_hint = {'top':0.9, 'right':0.5} # assume now Scatter has moved to x800 y500.
print "AFTER: "
print self.pos # it still print 200, 200 :(
class GameApp(App):
def build(self):
return Icon()
if __name__ == '__main__':
GameApp().run()回答 1
Stack Overflow用户
发布于 2013-08-04 17:54:54
问题是，窗口(以及布局本身)在分配布局(如size_hint或pos_hint)所遵循的值后，不会立即刷新。它们是在窗口刷新后更新的(直到方法结束)
您基本上可以显式地调用方法do_layout。文档中说，“当需要布局时，通过触发器调用此方法”。我不得不说，我不确定是否明确地调用它会导致一些问题，因为这种使用没有文档化。它对我有用，但要小心：
wid.pos = (250, 350)
print wid.pos # it prints (200, 350). Correct.
wid.pos_hint = {'top':0.9, 'right':0.5}
print wid.pos # it sill print (200, 350)
wid.do_layout()
print wid.pos # it should work now当您让窗口刷新时，即在您实际看到Scatter (或任何其他Widget)已经移动之后，这是不必要的。
编辑：问题中代码的更正版本
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.scatter import Scatter
from kivy.uix.floatlayout import FloatLayout
Builder.load_string("""
<Icon>:
size_hint: .06, .08
Image:
size: root.size
allow_stretch: True
keep_ratio: True
<BaseLayout>:
icon: _icon
Icon:
id: _icon
Button:
text: "Press me"
size_hint: .1,.05
on_press: _icon.move()
""")
class Icon(Scatter):
def __init__(self, **kwargs):
self.pos = (200, 200)
super(Icon, self).__init__(**kwargs)
def move(self):
print "BEFORE: "
print self.pos # print 200, 200
self.pos_hint = {'top':0.9, 'right':0.5} # assume now Scatter has moved to x800 y500.
self.parent.do_layout()
print "AFTER: "
print self.pos # it still print 200, 200 :(
class BaseLayout(FloatLayout):
pass
class GameApp(App):
def build(self):
return BaseLayout()
if __name__ == '__m
ain__':
GameApp().run()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/18042448
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