I am building a simple Kivy app with a couple of screens. The first screen has a couple of buttons which, when clicked, move to the second screen. The second screen has a text input widget and a button inside a Float Layout. The layout is loaded as a root widget by an explicit call to the kv file through Builder.
Everything was working fine and I added a 'focus: True' tag in the text input attributes. The app worked fine and I could type in the text input field with focus set as True. However, the text input field suddenly stopped working without any change in code or layout. I was not sure and searched Google for a couple of probable solutions, none of which worked:
Removed the 'focus: True' attribute and reloaded the app but the text input field still did not respond. I was unable to type anything from my keyboard.
Another post pointed out that the kv file was being loaded twice resulting in erratic behaviour. I tried to remove the explicit Builder file call and returned the root widget (Screen Manager) in the main code. However, it messed up my entire app and only showed a black empty screen.
Can you please advise as to what I may be doing wrong? The code is provided below:
Python Code:
from kivy.config import Config
Config.set('kivy','window_icon','sivaicon.png')
Config.set('graphics', 'resizable', True)
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.tabbedpanel import TabbedPanel
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.button import Button
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.image import Image
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.lang.builder import Builder
class SivaLoginScreen(Screen):
def twitter_authentication(self):
App.get_running_app().root.current='verify_screen'
def linkedin_authentication(self):
App.get_running_app().root.current='verify_screen'
class SivaVerifyScreen(Screen):
pass
class SivaTabbedScreen(Screen):
pass
class SivaScreenManager(ScreenManager):
pass
class ImageButton(ButtonBehavior, Image):
pass
# Tell Kivy to directly load a file. If this file defines a root widget, it will be returned by the method.
root_widget = Builder.load_file('siva.kv')
class SivaApp(App):
def build(self):
# Initialize root widget
return root_widget
if __name__ == '__main__':
# Run application
SivaApp().run()
kv file:
SivaScreenManager:
SivaLoginScreen:
SivaVerifyScreen:
SivaTabbedScreen:
<ImageButton>:
keep_ratio: True
<SivaLoginScreen>:
name: 'login_screen'
canvas.before:
Color:
rgba: 195/255, 60/255, 35/255, 1
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
size: root.width, root.height
Image:
id: login_logo_siva
source: 'images/sivalogo1.png'
keep_ratio: True
size_hint: 0.3, 0.3
pos_hint: {'center_x':0.5, 'center_y':0.75}
Label:
id: login_label_siva
pos: self.x*0.5-4, self.y*0.5+15
markup: True
font_name: 'roboto/Roboto-Medium.ttf'
text: '[color=#FDFD98]S.[/color][color=#B29DD9]I[/color][color=#FDFD98].[/color][color=#77DD77]V[/color][color=#FDFD98].[/color][color=#779ECB]A[/color]'
font_size: '40sp'
Label:
id: login_label_slogan1
pos: self.x*0.5-3, self.y*0.5-6
markup: True
font_name: 'roboto/Roboto-Regular.ttf'
text: '[color=#FDFD98]SLOGAN TEXT[/color]'
font_size: '13sp'
Label:
id: login_label_slogan2
pos: self.x*0.5-3, self.y*0.5-20
markup: True
font_name: 'roboto/Roboto-Regular.ttf'
text: '[color=#FDFD98]HEADLINE TEXT[/color]'
font_size: '13sp'
BoxLayout:
id:login_button_layout
orientation: 'horizontal'
size_hint: 0.2, 0.2
pos_hint: {'center_x':0.5, 'center_y':0.25}
ImageButton:
id: twitter_button
source: {'normal': 'images/twitter-96.png', 'down': 'images/twitter-96.png'} [self.state]
on_release: root.twitter_authentication()
ImageButton:
id: linkedin_button
source: {'normal': 'images/linkedin-96.png', 'down': 'images/linkedin-96.png'} [self.state]
on_release: root.linkedin_authentication()
<SivaVerifyScreen>:
name: 'verify_screen'
canvas.before:
Color:
rgba: 195/255, 60/255, 35/255, 1
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
size: root.width, root.height
Label:
id: verify_label
markup: True
font_name: 'roboto/Roboto-Regular.ttf'
text: 'Paste the verification code'
font_size: '16sp'
pos_hint: {'center_x':0.5, 'center_y':0.7}
size_hint: 1, 0.4
TextInput:
id: verify_input
multiline: False
font_size: '30sp'
pos_hint: {'center_x':0.5, 'center_y':0.55}
size_hint: 0.5, 0.1
ImageButton:
id: verify_button
source: {'normal': 'images/lock-96.png', 'down': 'images/lock-96.png'} [self.state]
pos_hint: {'center_x':0.5, 'center_y':0.35}
size_hint: 0.5, 0.5
<SivaTabbedScreen>:
name: 'tabbed_screen'
FloatLayout:
size: root.width, root.height
Label:
pos: self.x*0.5, self.y*0.5
text: 'SECOND SCREEN'
font_size: '50sp'
Please advise. I am helplessly stuck. :(
Thanks in advance
Okay so this was the problem: Some of my widgets were overlapping each other thereby rendering the widgets underneath as unresponsive. In my case, a button widget was overlapping my textinput widget due to which I was unable to enter text in the textinput widget.
I used the Kivy inspector tool to identify the extent of the widgets' dimensions:
python3 main.py -m inspector
Use Ctrl+e to launch the inspector while the app is running and click on each widget to check its size, position and parent. I reduced the button widget's size and converted the float layout into a stacked box layout and this resolved the issue.
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 want to add a few text fields defined by a user to an image and export is as one .png file.
I thought of just making screenshot of whole widget but that's low quality and it's not what I'm realling looking into.
For now I have code:
kv = '''
PageLayout:
orientation: 'vertical'
RelativeLayout:
Image:
pos:10,10
id: template
source: 'template.png'
Label:
pos: 50,50
markup: True
text: 'Test'
BoxLayout:
Button:
text: 'Configure'
on_release: app.open_settings()
Button:
id: savebtn
text: 'Save'
on_release: app.sc()
'''
And is it better to write it in kv language or python?
Thanks for any input!
I am using pydev on eclipse luna. My kv file is as follows:
<LoginForm>:
userid: userid
password: password
size_hint_x: 0.5
size_hint_y: None
height: 200
orientation: 'vertical'
pos_hint: {'center_x': 0.5,'center_y':0.5}
minimum_height: 100
minimum_width: 100
#User ID
Label:
text: 'User ID'
font_size: 20
size_hint_x: None
TextInput:
id: userid
font_size: 20
#User PW
Label:
text: 'Password'
font_size: 20
TextInput:
id: password
password: True
font_size: 20
Button:
text: 'Login'
My python code is:
from kivy.app import App;
from forms.login import LoginForm;
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
class LoginForm(BoxLayout):
def __init__(self, **kwargs):
super(LoginForm, self).__init__(**kwargs)
class StartApp(App):
def build(self):
Window.size = (480, 800)
return LoginForm()
#return StartApp();
if __name__ == '__main__':
StartApp().run()
Output:
The code is working correctly, however, my issue is that there is still some gap at left which is not present for other controls. I want User ID to be completely left aligned (in the above pic it is left aligned, but some space is still left).
Could you please advice/correct me on where I went wrong?
The Label isn't left-aligned because you haven't actually set that, by disabling the size_hint_x it just takes the default width of 100 pixels and the text appears in its centre.
You have two options for declaring the label.
Label:
text: 'User ID'
font_size: 20
size_hint_x: None
width: self.texture_size[0]
This will set the width of the Label to the exact size of the texture containing the image of the text. However, I think it's probably preferable to do the following:
Label:
text: 'User ID'
font_size: 20
text_size: self.size
halign: 'left'
valign: 'middle'
This way, rather than messing with the widget size/position you set the text_size (this controls the bounding box of the text texture) and the built in text alignment options take care of the rest.
In this case, the results of these should be similar if not identical.
We have a spinner in our code and need to assign a value to the selection so we can use it later.
GridLayout:
cols: 2
Label:
font_size: '48sp'
text: "[color=000000][sub]Select a sport:[/sub][/color]"
halign: 'left'
valign: 'middle'
markup: True
text_size: self.size
Spinner:
text: 'Select a sport'
values: ('Soccer', 'Basketball', 'Volleyball', 'Handball')
size: (100,44)
The spinner gives several options that, when selected, will replace its text. So if you select 'Basketball', its text property will be 'Basketball'. You can access the value this way.