使用Python在Kivy中进行数值输入 [英] Numeric Input in Kivy with Python
问题描述
I am very new to Kivy, and have found an online example for a simple calculator here that I would like to try to modify using the Kivy examples ~/examples/keyboard/main.py. In that example is a numeric keyboard, but I can't seem to figure out how to get it to appear instead of the standard keyboard. Help or suggestions would be greatly appreciated.
这是我的开始:
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
from kivy.core.window import Window
from kivy.uix.vkeyboard import VKeyboard
from kivy.properties import ObjectProperty
from kivy.uix.button import Button
from kivy.config import Config
from kivy.uix.screenmanager import Screen, ScreenManager
from kivy import require
Builder.load_string("""
<KeyboardScreen>:
displayLabel: displayLabel
kbContainer: kbContainer
BoxLayout:
orientation: 'vertical'
Label:
size_hint_y: 0.15
text: "Available Keyboard Layouts"
BoxLayout:
id: kbContainer
size_hint_y: 0.2
orientation:"horizontal"
padding: 10
Label:
id: displayLabel
size_hint_y: 0.15
markup: True
text: "[b]Key pressed[/b] - None"
halign: "center"
Button:
text: "Back"
size_hint_y: 0.1
on_release: root.manager.current = "mode"
Widget:
# Just a space taker to allow for the popup keyboard
size_hint_y: 0.5
<Calc>:
# This are attributes of the class Calc now
a: _a
b: _b
result: _result
KeyboardScreen:
AnchorLayout:
anchor_x: 'center'
anchor_y: 'top'
ScreenManager:
size_hint: 1, .9
id: _screen_manager
Screen:
name: 'screen1'
GridLayout:
cols:1
# TextInput:
Button:
id: _a
text: '3'
on_press:KeyboardScreen(name="keyboard")
# TextInput:
Button:
id: _b
text: '5'
on_press:KeyboardScreen(name="keyboard")
Label:
id: _result
Button:
text: 'sum'
# You can do the opertion directly
on_press: _result.text = str(int(_a.text) + int(_b.text))
Button:
text: 'product'
# Or you can call a method from the root class (instance of calc)
on_press: root.product(*args)
Screen:
name: 'screen2'
Label:
text: 'The second screen'
AnchorLayout:
anchor_x: 'center'
anchor_y: 'bottom'
BoxLayout:
orientation: 'horizontal'
size_hint: 1, .1
Button:
text: 'Go to Screen 1'
on_press: _screen_manager.current = 'screen1'
Button:
text: 'Go to Screen 2'
on_press: _screen_manager.current = 'screen2'""")
class Calc(FloatLayout):
# define the multiplication of a function
def product(self, instance):
# self.result, self.a and self.b where defined explicitely in the kv
self.result.text = str(int(self.a.text) * int(self.b.text))
class KeyboardScreen(Screen):
def __init__(self, **kwargs):
super(KeyboardScreen, self).__init__(**kwargs)
# self._add_keyboards()
self.set_layout("numeric.json","numeric.json")
self._keyboard = None
def set_layout(self, layout, button):
""" Change the keyboard layout to the one specified by *layout*. """
kb = Window.request_keyboard(
self._keyboard_close, self)
if kb.widget:
# If the current configuration supports Virtual Keyboards, this
# widget will be a kivy.uix.vkeyboard.VKeyboard instance.
self._keyboard = kb.widget
self._keyboard.layout = layout
else:
self._keyboard = kb
self._keyboard.bind(on_key_down=self.key_down,on_key_up=self.key_up)
def _keyboard_close(self, *args):
""" The active keyboard is being closed. """
if self._keyboard:
self._keyboard.unbind(on_key_down=self.key_down)
self._keyboard.unbind(on_key_up=self.key_up)
self._keyboard = None
def key_down(self, keyboard, keycode, text, modifiers):
""" The callback function that catches keyboard events. """
self.displayLabel.text = u"Key pressed - {0}".format(text)
# def key_up(self, keyboard, keycode):
def key_up(self, keyboard, keycode, *args):
""" The callback function that catches keyboard events. """
# system keyboard keycode: (122, 'z')
# dock keyboard keycode: 'z'
if isinstance(keycode, tuple):
keycode = keycode[1]
self.displayLabel.text += u" (up {0})".format(keycode)
class TestApp(App):
sm = None # The root screen manager
Config.set("kivy", "keyboard_mode", 'dock')
Config.write()
def build(self):
# self.sm = ScreenManager()
# self.sm.add_widget(KeyboardScreen(name="keyboard"))
return Calc()
if __name__ == '__main__':
TestApp().run()
推荐答案
我知道这个问题是3年前提出的，但是自从我来这里寻求类似的答案后，我想现在我应该回答了，因为我已经弄清楚了出去.幸运的是，它非常简单.
I know this question was asked 3 years ago, but since I came here seeking a similar answer I figured that I should answer now that I've got it figured out. Fortunately it's quite simple.
VKeyboard文档有详细的章节如何使用自定义布局，这就是键盘示例所做的事情.
The VKeyboard documentation has a section detailing how to use custom layouts which is what the keyboard example is doing.
因此，要更直接地回答您的问题，您需要做的是抓住 numeric.json 文件，并将其放在main.py旁边的目录中.
So to answer your question more directly, what you'll need to do is grab the numeric.json file from the keyboard example and put it in the directory next to your main.py.
从那里您只需要添加一个键盘设置功能即可抓住虚拟键盘并将layout属性设置为'numeric.json'.一个例子是
From there you just need to add a keyboard setup function that grabs the virtual keyboard and sets the layout property to 'numeric.json'. An example of this would be
kb = Window.request_keyboard(self._keyboard_close, self)
if kb.widget:
vkeyboard = kb.widget
vkeyboard.layout = 'numeric.json'
此外，在台式机上，您需要指定要使用对接"键盘.您可以通过使用设置keyboard_mode属性来执行此操作kivy配置
Additionally on desktop you need to specify that you want to use the 'docked' keyboard. You can do this by setting the keyboard_mode property using kivy Config
Config.set("kivy", "keyboard_mode", 'dock')
由于将所有内容放在上下文中通常是有帮助的，因此下面是执行此操作的最低可重复测试应用程序.
And since it's often helpful to have everything in context, below is a minimum reproducible test app that does this.
import kivy
kivy.require("1.11.1")
from kivy.config import Config
Config.set("kivy", "keyboard_mode", 'dock')
from kivy.app import App
from kivy.core.window import Window
from kivy.uix.textinput import TextInput
class Calc(TextInput):
def _keyboard_close(self):
pass
def setup_keyboard(self):
kb = Window.request_keyboard(self._keyboard_close, self)
if kb.widget:
kb.widget.layout = 'numeric.json'
class TestApp(App):
def build(self):
root = Calc()
root.setup_keyboard()
return root
if __name__ == '__main__':
TestApp().run()
这篇关于使用Python在Kivy中进行数值输入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
