I have a widget that I defined in Kv language, which exists within a layout that I also defined in Kv language. I would like to change the text of the widget in the layout in Kv. How would I go about is?
Python code:
import kivy
kivy.require('1.11.1')
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
class Test(BoxLayout):
pass
class KivyTestApp(App):
def build(self):
return Test()
app = KivyTestApp()
app.run()
Kv code:
<Header#BoxLayout>:
orientation: 'horizontal'
size_hint_y: 0.2
Button:
text: 'Button 1'
Button:
id: edit_but
<Test>:
orientation: 'vertical'
Header:
edit_but.text: 'Button 2'
# How do I do this ^ ?
Label:
text: 'Filler'
In your kv, you can add a Property to your Header rule (I named it edit_text). That property can be used to set the text of the Button by using text: root.edit_text. That Property can be set whenever you use the Header in kv as edit_text: 'Button 2':
<Header#BoxLayout>:
orientation: 'horizontal'
size_hint_y: 0.2
edit_text: ''
Button:
text: 'Button 1'
Button:
id: edit_but
text: root.edit_text
<Test>:
orientation: 'vertical'
Header:
edit_text: 'Button 2'
# How do I do this ^ ?
Label:
text: 'Filler'
Related
Assuming I have a layout written in kv and I define a BoxLayout with an id value, how would I later add more widgets into this layout without Kv language? I could do this in python, but I feel like it would be more efficient to do this in Kv language.
Here is some example code (Note: Widgets is a BoxLayout):
<Content#BoxLayout>:
orientation: 'vertical'
Button:
text: 'Test'
BoxLayout:
id: to_change
orientation: 'horizontal'
Button:
text: 'Button 1'
<Widgets>:
orientation: 'vertical'
Content:
# How would I add this button to the layout called "to_change"?
to_change:
Button:
text: 'Button 2'
I get:
AttributeError: 'Carousel' object has no attribute 'switch_on'
error whenever I try to click on the button
-------main.py----------
class main(App):
def build(self):
class SampBoxLayout(BoxLayout):
# For Switch
def switch_on(self, instance, value):
if value is True:
print("Switch On")
else:
print("Switch Off")
return Carousel()
sample_app = kv_main()
sample_app.run()
----------main.kv--------------
:
Label:
text: "Page 1"
size_hint: 1, .1
width :100
SampBoxLayout:
# ----------Switch ----------
BoxLayout:
BoxLayout:
orientation: "horizontal"
size_hint_x: .25
CustLabel:
text: "On / Off"
Switch:
id: switch_id
on_active: root.switch_on(self, self.active)# <--need help on this
Label:
text: "Page 2"
size_hint: 1, .1
width :100
Button:
text: "Button 2.1"
size_hint: None, None
width :100
Label:
text: "Page 3"
size_hint: 1, .1
width :100
Button:
text: "Button 3.1"
size_hint: None, None
width :100
You are using root.switch_on. As the error indicates, your root class is the carousel. Since SampBoxLayout is not root, you should give SampBoxLayout an id, and call it with it´s id.
Edited from your example:
SampBoxLayout:
id: samp
BoxLayout:
BoxLayout:
orientation: "horizontal"
size_hint_x: .25
CustLabel:
text: "On / Off"
Switch:
id: switch_id
on_active: samp.switch_on(self, self.active)
I don't know if you did something wrong when posting this, or if your code really looks like this. But you should not define classes inside your app class. Keep the classes on top level to access them in kv.
And your kv code is unusual. You have your widgets in a label.
I am trying to have a set of buttons that controls what screen is displayed while still having the buttons displayed.
bobo.py
import kivy
kivy.require("1.9.0")
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
class ButtSection(BoxLayout):
pass
class Welcome(Screen):
pass
class AccountOne(Screen):
pass
class AccountTwo(Screen):
pass
class ScreenManagement(ScreenManager):
pass
presentation = Builder.load_file("Bobo.kv")
class BoboApp(App):
def build(self):
return presentation
main = BoboApp()
main.run()
Bobo.kv
BoxLayout:
orientation: "horizontal"
BoxLayout:
ButtSection:
orientation: "vertical"
Button:
text: "Account One"
on_press: app.root.current = "a1"
Button:
text: "Account Two"
on_press: app.root.current = "a2"
Button:
text: "Account Three"
on_press: app.root.current = "a3"
ScreenManagement:
Welcome:
name: "wel"
Label:
text: "Welcome To Bobot"
AccountOne:
name: "a1"
Label:
text: "Page: Account One"
AccountTwo:
name: "a2"
Label:
text: "Page: Account One"
When I run the script, the welcome screen is the current screen. When I click a button, is does nothing even thought i included 'on_press: app.root.current = ''.
You have to analyze what app.root means and see if it is the ScreenManager.
app refers to the application that is the BoboApp instance, that is, main. root refers to the object that returns the build method of the application, that is, presentation. And presentation is the root object of the .kv, that is, the BoxLayout. With what we conclude that app.root is not the ScreenManager for which the error is valid.
Instead of using the root as a way to get to the ScreenManager it can be accessed through an id since the id is accessible within the whole tree.
On the other hand I have changed the names of the Screen to match the ones you want to set.
BoxLayout:
orientation: "horizontal"
BoxLayout:
ButtSection:
orientation: "vertical"
Button:
text: "Account One"
on_press: manager.current = "a1" # <---
Button:
text: "Account Two"
on_press: manager.current = "a2" # <---
Button:
text: "Account Three"
on_press: manager.current = "a3" # <---
ScreenManagement:
id: manager # <---
Welcome:
name: "a1" # <---
Label:
text: "Welcome To Bobot"
AccountOne:
name: "a2" # <---
Label:
text: "Page: Account One"
AccountTwo:
name: "a3" # <---
Label:
text: "Page: Account One"
I was trying to look at different examples online to solve this issue but Still cannot figure out. I have an app that calls a popup class. The popup has an input field that does some manipulation to the text in the input field. The manipulated data is stored in a variable inside of the popup class. Now how can the parent widget access the data obtained from this widget. Here is a short example of the code.
KV
<ScreenManagement>:
ScreenManager:
id: manager
size_hint_y: 93
Screen:
name: "Case_info_screen"
id: sc1
FloatLayout:
BoxLayout:
orientation: 'vertical'
BoxLayout:
size_hint_y: 10
canvas.before:
Color:
rgb: 0.17, 0.17, 0.17 # your color here
Rectangle:
pos: self.pos
size: self.size
Label:
text_size: self.size
font_size: 20
valign: 'middle'
height: "75dp"
size_hint_y: None
color: 1,1,1,1
size_hint_x: 75
text: " Case Info"
RelativeLayout:
size_hint_x: 25
Button:
text_size: self.size
halign: 'center'
valign: 'middle'
size_hint: 0.70, 0.6
pos_hint: {'center_x': 0.5, 'center_y': 0.5}
text: 'Automatic Filler'
on_press: root.formfiller()
BoxLayout:
size_hint_y: 5
spacing: 35
LabelCases:
text: ' Name: '
width: '125dp'
size_hint_x: None
TextInput:
id: first_name_input
width: '300dp'
height: '40dp'
size_hint_x: None
font_size: 18
hint_text: 'First Name'
TextInput:
id: last_name_input
width: '300dp'
height: '40dp'
size_hint_x: None
font_size: 18
hint_text: 'Last Name'
<Formfillerpop>:
title: 'Automatic Filler'
size_hint: None, None
size: 600, 600
BoxLayout:
orientation: 'vertical'
Label:
size_hint_y: 20
text: 'Please Paste your text'
markup: True
TextInput:
id: sentence
size_hint_y: 65
BoxLayout:
size_hint_y: 10
orientation: 'horizontal'
Button:
text: 'Analyze'
on_press: root.on_analyze(sentence.text)
Button:
text: 'Close'
on_press: root.closepop()
Python:
class Formfillerpop(Popup):
selection = StringProperty
id = ObjectProperty
def on_analyze(self, selection):
analyze = TextExtractor(selection)
names = analyze.name()
def closepop(self):
self.dismiss()
class ScreenManagement(FloatLayout):
def formfiller(self, *args):
Formfillerpop().open()
class IOApp(App):
def build(self):
return ScreenManagement()
if __name__ == '__main__':
IOApp().run()
Ultimately I want to take the txt from names in the popup and then autopopulate the first name and last name in the main app with the analyzed data
Sorry if this is basic. I am fairly new to Kivy.
You can access popup content using its content property. You can use it to read text property of read underlying TextInput. For example this code binds this property to local popup_text StringProperty, which means that any change in the popup text input will be reflected there:
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.app import App
from kivy.lang import Builder
from kivy.properties import StringProperty
Builder.load_string('''
<CustomPopup>:
size_hint: .5, .5
auto_dismiss: False
title: 'Hello world'
BoxLayout:
text_input: text_input
orientation: 'vertical'
TextInput:
id: text_input
Button:
text: 'dismiss'
on_press: root.dismiss()
''')
class CustomPopup(Popup):
pass
class TestApp(App):
popup_text = StringProperty()
def build(self):
l = BoxLayout()
l.add_widget(Button(
text='show_popup', on_press=self.show_popup
))
l.add_widget(Button(
text='print popup text', on_press=self.print_popup_text
))
return l
def show_popup(self, *args):
p = CustomPopup()
p.content.text_input.bind(text=self.setter('popup_text'))
p.open()
def print_popup_text(self, *args):
print(self.popup_text)
if __name__ == '__main__':
TestApp().run()
Hy, the problem is that with the current code, which is at this point preety much nothing but a text editor, when ever I try to make a scrollable label in the kv language and call it on the main screen at the push of a button, I get no error, theres just nothing there. I should mention that the text is taken from a stored file, and the only version that works is with a regular label. This is the code, I know its a bit long but its preety easy to understand so stay with me. Any sort of input is greatly apreciated and I thank you for taking the time.
#kivy.require("1.8.0")
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.uix.widget import Widget
from kivy.uix.scatter import Scatter
from kivy.uix.label import Label
from kivy.uix.scrollview import ScrollView
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.textinput import TextInput
from kivy.properties import StringProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.graphics import Line
from kivy.uix.gridlayout import GridLayout
kv = '''
#: import FadeTransition kivy.uix.screenmanager.FadeTransition
ScreenManager:
transition: FadeTransition()
MainScreen:
AddScreen:
AppendScreen:
<ScatterTextWidget>:
orientation: 'vertical'
TextInput:
id: main_input
font_size: 14
size_hint_y: None
height: root.height - botones_layout.height
font_color: [0.1,0.3,0.9,1]
focus: True
foreground_color: [0.2,0.5,0.9,1]
cursor_color: [0,0,1,1]
BoxLayout:
id: botones_layout
orientation: 'horizontal'
height: 30
Button:
id: home_button
text: "Back Home"
Button:
id: save_button
text: "Save to file"
on_press: root.saveToFile("Archive.txt", main_input.text)
<AppendTextWidget>:
orientation: 'vertical'
TextInput:
text: root.text
id: main_input
font_size: 14
size_hint_y: None
height: root.height - botones_layout.height
font_color: [0.1,0.3,0.9,1]
focus: True
foreground_color: [0.2,0.5,0.9,1]
cursor_color: [0,0,1,1]
BoxLayout:
id: botones_layout
orientation: 'horizontal'
height: 30
Button:
id: home_button
text: "Back Home"
on_release: app.root.current = "main"
Button:
id: save_button
text: "Save"
on_press: root.append(main_input.text)
#This does not work <--- <--- <---
<ScrollableLabel>:
Label:
text: root.text
font_size: 15
text_size: self.width, None
color: [0,255,0,1]
padding_x: 20
size_hint_y: None
pos_hint: {"left":1, "top":1}
height: self.texture_size[1]
<MainScreen>:
name: "main"
FloatLayout:
# This does work
Label:
text: root.text
font_size: 15
text_size: self.width, None
color: [0,255,0,1]
padding_x: 20
size_hint_y: None
pos_hint: {"left":1, "top":1}
height: self.texture_size[1]
ActionBar:
pos_hint: {'top':1}
ActionView:
use_separator: True
ActionPrevious:
title: "Text"
with_previous: False
ActionOverflow:
ActionButton:
text: "New"
on_release: app.root.current = "add"
ActionButton:
text: "Update"
on_press: root.clicked()
ActionButton:
text: "Add"
on_release: app.root.current = "append"
<AddScreen>:
name: "add"
FloatLayout:
ScatterTextWidget
<AppendScreen>:
name: "append"
FloatLayout:
AppendTextWidget
'''
class ScatterTextWidget(BoxLayout):
def saveToFile(self,name,text):
f = open(name, "w")
f.write("\n\n\n" + " " + ">>>" + text + "test"*500)
f.close()
class AppendTextWidget(BoxLayout):
text = StringProperty("")
def append(self,text):
with open("Archive.txt", "a") as f:
f.write("\n" + " " + ">>>" + text)
f.close()
class ScrollableLabel(ScrollView):
text = StringProperty('')
pass
class MainScreen(Screen):
text = StringProperty("")
def clicked(self):
with open("Archive.txt", "r") as f:
contents = f.read()
self.text = contents
pass
class AddScreen(Screen):
pass
class AppendScreen(Screen):
pass
class MyApp(App):
def build(self):
return Builder.load_string(kv)
if __name__ == '__main__':
MyApp().run()
Why it works:
Your text in MainScreen is updated from file, then passed to Label and the text is loaded. ScrollableLabel.text stays unchanged.
Why it doesn't work as you expect:
There's no communication between your classes, therefore only text changed is an actual self.text = MainScreen.text
How to make it work:
Either use something on a global range, i.e. variable in your App class, then a = App.get_running_app() and access variable through a.<variable> or use __init__ to initialize your ScrollableLabel inside the MainScreen and pass it the text
So it's basically a duplicate of this and that one is a duplicate of an older unsimplified question.