如何逐个字符显示标签文本？

Question

我一直在尝试在 Kivy 上编写一个基于文本的小冒险游戏。这意味着，将有大量文本供用户阅读，如果不是一次显示 Label 中的所有文本，而是在一个简单的字符中逐个字符显示，这将在眼睛上容易得多"animation"。到此 "animation" 结束时，将显示整个文本。

在常规 Python 中，我想要的是这样的：

text1 = "Now tell me, what is your astrological sign?\n"
    for character in text1:
        sys.stdout.write(character)
        sys.stdout.flush()
        time.sleep(0.05)

在 Kivy 中，这似乎要困难得多，因为睡眠功能只是 'sleeps' 整个应用程序。我四处搜索，并没有真正找到任何关于这个特定问题的信息。其他一些人通过使用 Kivy Clock 对象解决了他们对 time.sleep 的需求，但即使在这里我也只能让文本一次显示一个字符（见下面的代码），这绝对不是我要。我希望所有字符加起来，并在 "animation" 结束时让整个 Label 文本站在那里。

from kivy.app import App
from kivy.lang import Builder
from kivy.properties import StringProperty
import time
from kivy.clock import Clock

kv = '''

BoxLayout:
    orientation: 'vertical'
    Label:
        text: app.text
    Button:
        text: 'click me'
        on_press: app.clicked()

'''


class MyApp(App):
    text = StringProperty("hello world")
    lst = [1,2,3,4,5,6,7,8,9,10]

    def build(self):
        return Builder.load_string(kv)

    def clicked(self):
        Clock.schedule_interval(self.clicked2, 0.5)

    def clicked2(self, count):
        if len(self.lst) == 0:
            return False
        self.text = "clicked!" + str(self.lst[len(self.lst)-1])
        self.lst.pop()


if __name__ == '__main__':
    MyApp().run()

这是我目前能想到的最好的，但同样，这与我真正想要的还差得很远。

你们中有没有人有更多经验可以帮助我解决这个问题？不胜感激，谢谢！

Answer 1

我做到了！下面的代码正是我想要的。我只是使用字符串索引和列表通过 Clock.schedule_interval() 函数对其进行迭代。

我在 kv 中添加了 "valign" 和一些填充以使其看起来更好。和 text_size：self_sice 是为了让文本在多行时换行。

from kivy.lang import Builder
from kivy.properties import StringProperty
import time
from kivy.clock import Clock

kv = '''

BoxLayout:
    orientation: 'vertical'
    Label:
        text: app.text
        text_size: self.size
        valign: "middle"
        padding: root.width/20, root.height/20
    Button:
        text: 'click me'
        on_press: app.clicked()

'''


class MyApp(App):
    text = StringProperty("hello world")
    blabla = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum"
    lst = []
    for x in range(len(blabla)+1):
        print(x)
        lst.append(x)
    lst.reverse()

    def build(self):
        return Builder.load_string(kv)

    def clicked(self):
        Clock.schedule_interval(self.clicked2, 0.05)

    def clicked2(self,count):
        if len(self.lst) == 0:
            return False
        self.text = str(self.blabla[:self.lst[len(self.lst)-1]])

        self.lst.pop()


if __name__ == '__main__':
    MyApp().run()

Answer 2

我认识你，回答你的问题。但是，我将使用 scope variable 向您展示更短的代码。要使用它声明 nonlocal [var]

示例：

def A(i=0):
  def c():
    nonlocal i; i += 1
  print(i)        #0
  c(); print(i) #1
  c(); print(i) #2
  c(); print(i) #3
A()

我在下面的代码中使用它：

from kivy.lang import Builder
from kivy.properties import StringProperty
import time
from kivy.clock import Clock
from kivy.app import App

kv = '''

BoxLayout:
    orientation: 'vertical'
    Label:
        text: app.text
        text_size: self.size
        valign: "middle"
        padding: root.width/20, root.height/20
    Button:
        text: 'click me'
        on_press: app.clicked()

'''


class MyApp(App):
    text = StringProperty("hello world")
    blabla = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum"
    def build(self): return Builder.load_string(kv)

    def clicked(self, i=0):
      def clicked2():
        nonlocal i; i += 1
        if i > len(self.blabla): return False
        self.text = self.blabla[:i]
      Clock.schedule_interval(lambda count: clicked2(), 0.05)


if __name__ == '__main__': MyApp().run()

如何逐个字符显示标签文本？

How do I display Label text character-by-character?

python

animation

label

widget

kivy