My app (using kivy) needs to substitute text with widgets inside an unspecified number of buttons using iteration. I don't use kv language. Only the last button displays any content.
My app should display an unspecified number of buttons. Simplified example:
import kivy
kivy.require('2.0.0')
from kivy.app import App
from kivy.core.window import Window
from kivy.uix.widget import Widget
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.image import Image
class Layout(Widget):
def __init__(self, app):
super().__init__()
self.layout = BoxLayout(orientation='vertical', size=Window.size)
contents = ['text1', 'text2', 'text3']
for text in contents:
button = Button(height=300, size_hint=(1, None))
button.text = text
self.layout.add_widget(button)
self.add_widget(self.layout)
class MyApp(App):
def build(self):
self.form = Layout(self)
return self.form
def on_pause(self):
return True
if __name__ in ('__main__', '__android__'):
MyApp().run()
Only instead of text buttons display images with descriptions. I change the code:
import kivy
kivy.require('2.0.0')
from kivy.app import App
from kivy.core.window import Window
from kivy.uix.widget import Widget
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.image import Image
class Layout(Widget):
def __init__(self, app):
super().__init__()
self.layout = BoxLayout(orientation='vertical', size=Window.size)
contents = [('img1', 'text1'), ('img2', 'text2'), ('img3', 'text3')]
for img, text in contents:
button = Button(height=300, size_hint=(1, None))
button_layout = BoxLayout(orientation='vertical', size_hint=(1, 1))
label = Label(text=text)
image = Image(source=f'{img}.jpg', size_hint=(1, 1), allow_stretch=True)
button_layout.add_widget(image)
button_layout.add_widget(label)
button.add_widget(button_layout)
self.layout.add_widget(button)
self.add_widget(self.layout)
class MyApp(App):
def build(self):
self.form = Layout(self)
return self.form
def on_pause(self):
return True
if __name__ in ('__main__', '__android__'):
MyApp().run()
And only the last button displays content.
As far as I can understand, at some point Python automatically gets read of the content of the previous button. How can I prevent it? Also what is the best way to center it?
I'm not a native speaker, so sorry for bad grammar. Thank you in advance.
Related
After some days looking for an answer, I finally decided that it was time to ask some more experienced users ! Here is my problem : in the following piece of code (simplified version of the original code), when I open the Dialog by clicking on the button, the opened window doesn't have the right size, and so one part of the GridLayout is appearing outside this popup.
I anyone has an idea, thanks in advance !
from kivymd.app import MDApp
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivymd.uix.dialog import MDDialog
class AppClass(MDApp):
def build_toolbar(self):
button = Button(text="Press")
button.bind(on_press=self.popup)
return button
def build(self):
self.theme_cls.theme_style = "Dark"
layout = BoxLayout(orientation='vertical')
toolbar = self.build_toolbar()
layout.add_widget(toolbar)
return layout
#==============================
def popup(self, instance):
print("called")
panel = self.build_settings_panel()
self.dialog = MDDialog(
type="custom",
title="Settings",
content_cls=panel
)
self.dialog.open()
def build_settings_panel(self):
panel = GridLayout(cols=2, row_default_height=100)
for i in range(4):
panel.add_widget(Label(text="Number"))
panel.add_widget(Label(text=str(i)))
return panel
if __name__ == '__main__':
AppClass().run()
It appears that the problem is the size of the panel. way to fix that is to just calculate that size and set it in the build_settings_panel():
def build_settings_panel(self):
row_height = 100
total_height = 0
panel = GridLayout(cols=2, row_default_height=row_height)
for i in range(4):
panel.add_widget(Label(text="Number"))
panel.add_widget(Label(text=str(i)))
total_height +=row_height
panel.height = total_height
return panel
You can try:
row_default_height=9
In your code:
from kivymd.app import MDApp
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivymd.uix.dialog import MDDialog
class AppClassjbsidis(MDApp):
def build_toolbar(self):
button = Button(text="Press")
button.bind(on_press=self.popup)
return button
def build(self):
self.theme_cls.theme_style = "Dark"
layout = BoxLayout(orientation='vertical')
toolbar = self.build_toolbar()
layout.add_widget(toolbar)
return layout
#==============================
def popup(self, instance):
print("called")
panel = self.build_settings_panel()
self.dialog = MDDialog(
type="custom",
title="[color=ffffff]Settings",
content_cls=panel
)
self.dialog.open()
def build_settings_panel(self):
panel = GridLayout(cols=2, row_default_height=9)
for i in range(4):
panel.add_widget(Label(text="Number"))
panel.add_widget(Label(text=str(i)))
return panel
if __name__ == '__main__':
AppClassjbsidis().run()
Pictures:
I think this question is very basic, but it stops me for two days.
I want to make a simple Kivy-GUI-App. Drag a folder to a ScrollView, then the ScrollView show the files in the folder.
Here is where am I:
from kivy.app import App
from kivy.uix.button import Button
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.scrollview import ScrollView
from kivy.uix.gridlayout import GridLayout
class DropApp(App):
def build(self):
box = BoxLayout()
scrV = ScrollView(width = 300, height = 400, size_hint_x=None, size_hint_y=None)
box.add_widget(scrV)
layout = GridLayout(cols=1, spacing=10, size_hint_y=None)
layout.bind(minimum_height=layout.setter('height'))
for i in range(100):
btn = Button(text=str(i), size_hint_y=None, height=40)
layout.add_widget(btn)
scrV.add_widget(layout)
Window.bind(on_dropfile=self.handledrops(widget = scrV))
return box
def handledrops(self, widget, filename, *args):
if widget.collide_point(*Window.mouse_pos):
print(filename)
if __name__ == '__main__':
DropApp().run()
NOTE: drop to a widget not the window.
I did a lot of googling, studied a lot of examples. I cannot find what's wrong with the code.
Most examples on internet use a lot of classes. But what I want is window, button, label.... I try to understand what's class, what's init, what's self., what's super(). But they make the code abstract. So I avoid them as possible as i can. Hope someone can help me what's wrong with this code.
from kivy.app import App
from kivy.uix.button import Button
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.scrollview import ScrollView
from kivy.uix.gridlayout import GridLayout
class DropApp(App):
def build(self):
box = BoxLayout()
self.scrV = ScrollView(width = 300, height = 400, size_hint_x=None, size_hint_y=None)
box.add_widget(self.scrV)
layout = GridLayout(cols=1, spacing=10, size_hint_y=None)
layout.bind(minimum_height=layout.setter('height'))
for i in range(100):
btn = Button(text=str(i), size_hint_y=None, height=40)
layout.add_widget(btn)
self.scrV.add_widget(layout)
Window.bind(on_dropfile=self.handledrops)
return box
def handledrops(self, window_object, filename):
if self.scrV.collide_point(*Window.mouse_pos):
print(filename)
if __name__ == '__main__':
DropApp().run()
I'm learning how to use Kivy, and I would like to know how can I align the labels inside the listview I built.
The labels are centered by default, and I would like to align all the labels to the left.
My code:
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.listview import SimpleListAdapter
from kivy.uix.listview import ListView
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
class TestApp(App):
def build(self):
messages = ["a", "b"]
layout = BoxLayout(orientation='vertical')
btn1 = Button(text='Hello')
textinput = TextInput(text='Hello world', size_hint=(1, 0.1))
messages.append("sd")
simple_list_adapter = SimpleListAdapter(
data=messages,
cls=Label)
simple_list_adapter.cls
list_view = ListView(adapter=simple_list_adapter)
layout.add_widget(list_view)
layout.add_widget(textinput)
return layout
TestApp().run()
A simple solution is to create a Label with that desired alignment
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.listview import SimpleListAdapter
from kivy.uix.listview import ListView
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
class LeftLabel(Label):
def __init__(self, **kwargs):
super(LeftLabel, self).__init__(**kwargs)
# https://kivy.org/doc/stable/api-kivy.uix.label.html#text-alignment-and-wrapping
self.halign = "left"
self.bind(size=self.setter("text_size"))
class TestApp(App):
def build(self):
messages = ["a", "b"]
layout = BoxLayout(orientation="vertical")
btn1 = Button(text="Hello")
textinput = TextInput(text="Hello world", size_hint=(1, 0.1))
messages.append("sd")
simple_list_adapter = SimpleListAdapter(data=messages, cls=LeftLabel)
list_view = ListView(adapter=simple_list_adapter)
layout.add_widget(list_view)
layout.add_widget(textinput)
return layout
TestApp().run()
Since you are starting in kivy it is recommended that you learn RecycleView instead of ListView since the latter is deprecated:
Deprecated since version 1.10.0: ListView has been deprecated, use RecycleView instead.
I have a question about kivy. Is it possible to create screens as variables? Lets say I want to create a new screen with a button inside the kivy application. Is it possible to do that? If so how could you do it??
You just have to create a Screen object that you want to create and add it to the ScreenManager:
screen = Your_Screen(name="some_name")
your_screen_manager.add_widget(screen)
Example:
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.button import Button
class TestScreen(Screen):
def __init__(self, **kwargs):
Screen.__init__(self, **kwargs)
layout = BoxLayout(orientation="vertical")
self.add_widget(layout)
layout.add_widget(Label(text=self.name))
button = Button(text="{}: Add Screen".format(self.name))
layout.add_widget(button)
button.bind(on_press=self.add_screen)
def add_screen(self, *args):
n = len(self.manager.screen_names)
screen = TestScreen(name="screen {}".format(n))
self.manager.add_widget(screen)
self.manager.current = screen.name
# Create the screen manager
sm = ScreenManager()
sm.add_widget(TestScreen(name='screen 0'))
class TestApp(App):
def build(self):
return sm
if __name__ == '__main__':
TestApp().run()
how do i change the text of a label to the value of the slider immediately.
this is my current code
import kivy
kivy.require('1.10.0')
from kivy.app import App
from kivy.uix.slider import Slider
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label``
class app(App):
def build(self):
layout = BoxLayout(orientation='vertical')
slide = Slider(min=-100, max=100,value=0)
label = Label(text=str(slide.value))
layout.add_widget(slide)
layout.add_widget(label)
return layout
app().run()
i want the answer in python
You need to create a Kivy Property and bind the slider value to an on_ event where you can then update the label's text. Here's one way to do that:
from kivy.app import App
from kivy.uix.slider import Slider
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.properties import NumericProperty
import kivy
kivy.require('1.10.0')
class Container(BoxLayout):
slider_val = NumericProperty(0)
def __init__(self, *args, **kwargs):
super(Container, self).__init__(*args, **kwargs)
self.orientation = 'vertical'
slide = Slider(min=-100, max=100, value=0)
slide.fbind('value', self.on_slider_val)
self.label = Label(text=str(self.slider_val))
self.add_widget(slide)
self.add_widget(self.label)
def on_slider_val(self, instance, val):
self.label.text = str(val)
class app(App):
def build(self):
return Container()
app().run()