我无法让Kivy中的ScrollView滚动文本段落。我在下面附上了一个代码示例。谁能说出错了什么？谢谢。
import kivy
import string
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.scrollview import ScrollView
class longTextLabelApp(App):
def build(self):
scrollViewLayout = ScrollView(do_scroll_x=False)
childLayout = GridLayout(cols = 1, size_hint_x = 1, size_hint_y = None)
childLayout.bind(minimum_height=childLayout.setter('height'))
def longTextLabel():
_long_text = """
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus odio nisi, pellentesque molestie adipiscing vitae, aliquam at tellus. Fusce quis est ornare erat pulvinar elementum ut sed felis. Donec vel neque mauris. In sit amet nunc sit amet diam dapibus lacinia. In sodales placerat mauris, ut euismod augue laoreet at. Integer in neque non odio fermentum volutpat nec nec nulla. Donec et risus non mi viverra posuere. Phasellus cursus augue purus, eget volutpat leo. Phasellus sed dui vitae ipsum mattis facilisis vehicula eu justo.
Quisque neque dolor, egestas sed venenatis eget, porta id ipsum. Ut faucibus, massa vitae imperdiet rutrum, sem dolor rhoncus magna, non lacinia nulla risus non dui. Nulla sit amet risus orci. Nunc libero justo, interdum eu pulvinar vel, pulvinar et lectus. Phasellus sed luctus diam. Pellentesque non feugiat dolor. Cras at dolor velit, gravida congue velit. Aliquam erat volutpat. Nullam eu nunc dui, quis sagittis dolor. Ut nec dui eget odio pulvinar placerat. Pellentesque mi metus, tristique et placerat ac, pulvinar vel quam. Nam blandit magna a urna imperdiet molestie. Nullam ut nisi eget enim laoreet sodales sit amet a felis.
"""
reallyLongText = _long_text + _long_text + _long_text + _long_text +_long_text
myLabel = Label(text = reallyLongText, text_size = (700,None), line_height=1.5)
return myLabel
childLayout.add_widget(longTextLabel())
scrollViewLayout.add_widget(childLayout)
return scrollViewLayout
if __name__ == '__main__':
longTextLabelApp().run()
答案 0 :(得分：1)
Label（和Widget）的默认大小为（100,100）。如果你看到屏幕上的所有文字都没关系。如果你打印myLabel.size，你就会意识到这一点。您需要确保设置标签的height（myLabel.height: 2200），但首先将size_hint_y设置为None（myLabel.size_hint_y=None）。以下代码应该有效：
import kivy
import string
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.scrollview import ScrollView
from kivy.graphics import Rectangle, Color
class longTextLabelApp(App):
def build(self):
scrollViewLayout = ScrollView(do_scroll_x=False)
childLayout = GridLayout(cols = 1, size_hint_x = 1, size_hint_y = None)
childLayout.bind(minimum_height=childLayout.setter('height'))
def longTextLabel():
_long_text = """
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus odio nisi, pellentesque molestie adipiscing vitae, aliquam at tellus. Fusce quis est ornare erat pulvinar elementum ut sed felis. Donec vel neque mauris. In sit amet nunc sit amet diam dapibus lacinia. In sodales placerat mauris, ut euismod augue laoreet at. Integer in neque non odio fermentum volutpat nec nec nulla. Donec et risus non mi viverra posuere. Phasellus cursus augue purus, eget volutpat leo. Phasellus sed dui vitae ipsum mattis facilisis vehicula eu justo.
Quisque neque dolor, egestas sed venenatis eget, porta id ipsum. Ut faucibus, massa vitae imperdiet rutrum, sem dolor rhoncus magna, non lacinia nulla risus non dui. Nulla sit amet risus orci. Nunc libero justo, interdum eu pulvinar vel, pulvinar et lectus. Phasellus sed luctus diam. Pellentesque non feugiat dolor. Cras at dolor velit, gravida congue velit. Aliquam erat volutpat. Nullam eu nunc dui, quis sagittis dolor. Ut nec dui eget odio pulvinar placerat. Pellentesque mi metus, tristique et placerat ac, pulvinar vel quam. Nam blandit magna a urna imperdiet molestie. Nullam ut nisi eget enim laoreet sodales sit amet a felis.
"""
reallyLongText = _long_text + _long_text + _long_text + _long_text +_long_text
myLabel = Label(text = reallyLongText, text_size = (700,None), line_height=1.5)
print "The label size is ", myLabel.size
myLabel.size_hint_y = None
myLabel.height = 2200
return myLabel
childLayout.add_widget(longTextLabel())
scrollViewLayout.add_widget(childLayout)
return scrollViewLayout
if __name__ == '__main__':
longTextLabelApp().run()
编辑 - RST文件
根据您的目标，最好使用RSTDocument。标签只是标签。它们不适应内容或文本。把它们想象成贴纸。 （RSTDocment）[http://kivy.org/docs/api-kivy.uix.rst.html]，仍然表示为高度实验性，但更适合长文本，特别是如果它们是动态。它们实际上包括Scroll。
from kivy.app import App
from kivy.uix.rst import RstDocument
class RstDocumentApp(App):
def build(self):
_long_text = """
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus odio nisi, pellentesque molestie adipiscing vitae, aliquam at tellus. Fusce quis est ornare erat pulvinar elementum ut sed felis. Donec vel neque mauris. In sit amet nunc sit amet diam dapibus lacinia. In sodales placerat mauris, ut euismod augue laoreet at. Integer in neque non odio fermentum volutpat nec nec nulla. Donec et risus non mi viverra posuere. Phasellus cursus augue purus, eget volutpat leo. Phasellus sed dui vitae ipsum mattis facilisis vehicula eu justo.
Quisque neque dolor, egestas sed venenatis eget, porta id ipsum. Ut faucibus, massa vitae imperdiet rutrum, sem dolor rhoncus magna, non lacinia nulla risus non dui. Nulla sit amet risus orci. Nunc libero justo, interdum eu pulvinar vel, pulvinar et lectus. Phasellus sed luctus diam. Pellentesque non feugiat dolor. Cras at dolor velit, gravida congue velit. Aliquam erat volutpat. Nullam eu nunc dui, quis sagittis dolor. Ut nec dui eget odio pulvinar placerat. Pellentesque mi metus, tristique et placerat ac, pulvinar vel quam. Nam blandit magna a urna imperdiet molestie. Nullam ut nisi eget enim laoreet sodales sit amet a felis.
"""
reallyLongText = _long_text + _long_text + _long_text + _long_text +_long_text
return RstDocument(text = reallyLongText)
if __name__ == '__main__':
RstDocumentApp().run()
答案 1 :(得分：0)
您可以将Label设置为其中的纹理大小。
FloatLayout:
Label:
# adding a background to see the amount of space the label takes
canvas.before:
Color:
rgba: .5, .5, .5, .5
Rectangle:
size: self.size
pos: self.pos
text: "How can the only thing constant in the universe be `change` when\nchange itself is by it's very nature `not constant`?"
pos_hint: {'center_x': .5, 'center_y': .5}
size_hint: None, None
size: self.texture_size
然而，有了这个，你只会得到一个标签，它只会扩展文本中的文本数量，并且需要你自己添加\n来使其包装。更好的方法是通过设置text_size类似下面的内容让标签内的文本自动换行一定的宽度：
FloatLayout:
ScrollView:
# take half of parents size
size_hint: .5, .5
pos_hint: {'center_x': .5, 'center_y': .5}
Label:
canvas.before:
Color:
rgba: .5, .5, .5, .5
Rectangle:
size: self.size
pos: self.pos
text: "\n1. Two hunters are out in the woods when one of them collapses. He doesn't seem to be breathing and his eyes are glazed. The other guy whips out his phone and calls the emergency services. He gasps, `My friend is dead! What can I do?`\n\n The operator says `Calm down. I can help. First, let's make sure he's dead.`\n\n There is a silence, then a gun shot is heard. Back on the phone, the guy says `OK, now what?`\n\n\n2. Sherlock Holmes and Dr Watson were going camping. They pitched their tent under the stars and went to sleep. Sometime in the middle of the night Holmes woke Watson up and said:\n\n `Watson, look up at the sky, and tell me what you see.`\n\n Watson replied: `I see millions and millions of stars.`\n\n Holmes said: `And what do you deduce from that?`\n\n Watson replied: `Well, if there are millions of stars, and if even a few of those have planets, it’s quite likely there are some planets like Earth out there. And if there are a few planets like Earth out there, there might also be life.`\n\n And Holmes said: `Watson, you idiot, it means that somebody stole our tent.`\n\n\n3. Three women talk about their husband is performance as lovers.\n\nThe first woman says, `My husband is a marriage counselor, so he always buys me flowers and candy before we make love.`\n\nThe second woman says, `My husband is a motorcycle mechanic. He likes to play rough and use leather sometimes.`\n\nThe third woman shakes her head and says, `My husband works for an Internet company. He just sits on the edge of the bed and tells me how great it's going to be when I get it.` \n\n\n4. As within, so outside. Fractals equations show the possibility of having infinity within minutia. Each and every cell can be a image of the whole; merging the micro and the macro into one.\n"
pos_hint: {'center_x': .5, 'center_y': .5}
size_hint: 1, None
text_size: self.width, None
height: self.texture_size[1]