I have screen that has two boxlayouts. first one is empty. second one has button to open popup. In popup i have 2 textinputs and checkbox. I want to add those textinputs as a labels to that boxlayout and checkbox as well.
I can add button to boxlayout if i have button on that screen. but once we go to popup i cant figure out how to do it.
Py.
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.screenmanager import Screen, ScreenManager
class MyPopup(Popup):
pass
class MainScreen(Screen):
pass
class SecondScreen(Screen):
def fire_popup(self):
pops = MyPopup()
pops.open()
class ScreenManagement(ScreenManager):
def changescreen(self, value):
try:
if value !='main':
self.current = value
except:
print('No Screen named'+ value)
class testiApp(App):
def build(self):
self.title = 'Hello'
def add_more(self):
addbutton = self.root.get_screen('Page2').ids.empty
addbutton.add_widget(Button(text='Hello'))
def remove(self):
container = self.root.get_screen('Page2').ids.empty
if len(container.children) > 0:
container.remove_widget(container.children[0])
testiApp().run()
Kv.
<MyPopup>:
id:pop
size_hint: .4, .4
auto_dismiss: False
title: 'XXX!!'
BoxLayout:
orientation:'vertical'
BoxLayout:
orientation:'horizontal'
Label:
text:'X1'
TextInput:
id: X1
Label:
text:'X2'
TextInput:
id:X2
CheckBox:
id:X3
BoxLayout:
orientation:'horizontal'
Button:
text:'Add'
on_release: app.add_more()
Button:
text: 'Close'
on_press: pop.dismiss()
ScreenManagement:
MainScreen:
name:'Main'
SecondScreen:
name:'Page2'
<MainScreen>:
name:'Main'
BoxLayout:
Button:
text:'Next Page'
on_release: app.root.current ='Page2'
<SecondScreen>:
name:'Page2'
BoxLayout:
orientation:'vertical'
BoxLayout:
orientation:'vertical'
Label:
text:'Popup Test'
ScrollView:
GridLayout:
orientation: "vertical"
size_hint_y: None
height: self.minimum_height
row_default_height: 60
cols:1
id:empty
BoxLayout:
Button:
text:'Open Popup'
on_press: root.fire_popup()
Button:
text:'Add'
on_release: app.add_more()
Button:
text:'remove'
on_release: app.remove()
Question
I want to add those textinputs as a labels to that boxlayout and
checkbox as well.
Solution
The solution involves enhancements to the kv file and Python script.
kv file
Implement the view for class rule, <Row>:
Pass the values of X1, X2, X3 to method add_more()
Optional: add attributes to ScrollView:
Snippets - kv file
<Row>:
x1: ''
x2: ''
x3: False
Label:
text: root.x1
Label:
text: root.x2
CheckBox:
active: root.x3
<MyPopup>:
...
BoxLayout:
orientation:'horizontal'
Button:
text:'Add'
on_release: app.add_more(X1.text, X2.text, X3.active)
...
<SecondScreen>:
...
ScrollView:
bar_width: 10
bar_color: 1, 0, 0, 1 # red
bar_inactive_color: 0, 0, 1, 1 # blue
effect_cls: "ScrollEffect"
scroll_type: ['bars', 'content']
py file
Declare a class Row() with inheritance of BoxLayout.
Declare class attributes for x1, x2, and x3 of type StringProperty and BooleanProperty
Implement a constructor to populate x1, x2, and x3
Modify method add_more() to accept x1, x2, and x3
Snippets - py file
class Row(BoxLayout):
x1 = StringProperty('')
x2 = StringProperty('')
x3 = BooleanProperty(False)
def __init__(self, x1, x2, x3, **kwargs):
super(Row, self).__init__(**kwargs)
self.x1 = x1
self.x2 = x2
self.x3 = x3
class testiApp(App):
...
def add_more(self, x1, x2, x3):
addbutton = self.root.get_screen('Page2').ids.empty
addbutton.add_widget(Row(x1, x2, x3))
Output
If I understand what you are trying to do, you can get the text from your TextInput by saving a reference to the MyPopup that gets created in your SecondScreen:
class SecondScreen(Screen):
def fire_popup(self):
self.pops = MyPopup()
self.pops.open()
Then use that reference in your add_more() method:
def add_more(self):
addbutton = self.root.get_screen('Page2').ids.empty
addbutton.add_widget(Button(text=self.root.current_screen.pops.ids.X1.text))
Of course, you can reference the X2 similarly.
Related
I have a kivymd app that has a screen with a button on it. When you click this button an MDCard will appear on the screen. When you click on this new MDCard it will call a function that will print a message on the terminal. However, I am having trouble getting this MDCard to call the function. I am getting the error:
AttributeError: 'MDCard' object has no attribute 'option'
The MDCard is in a separate kv string from the main kv string. Essentially I have two kv strings. When you press the button, the second kv string will be added as a widget to the first kv string.
I figured it is because the second kv string doesn't have a class as a root but I don't know how to do this. How can I get the MDCard to call the function??
MAIN.PY
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivymd.app import MDApp
from button_screen import button_screen
MainNav = '''
<ContentNavigationDrawer>:
ScrollView:
MDList:
OneLineListItem:
text: 'Go to Button Screen'
on_press:
root.nav_drawer.set_state("close")
root.screen_manager.current = "go_to_button_screen"
Screen:
MDToolbar:
id: toolbar
pos_hint: {"top": 1}
elevation: 10
left_action_items: [["menu", lambda x: nav_drawer.set_state("open")]]
MDNavigationLayout:
x: toolbar.height
ScreenManager:
id: screen_manager
Screen:
name: "words_nav_item"
button_screen:
name: "go_to_button_screen"
MDNavigationDrawer:
id: nav_drawer
ContentNavigationDrawer:
screen_manager: screen_manager
nav_drawer: nav_drawer
'''
class ContentNavigationDrawer(BoxLayout):
screen_manager = ObjectProperty()
nav_drawer = ObjectProperty()
class main_test(MDApp):
def build(self):
self.theme_cls.primary_palette = "Red"
return Builder.load_string(MainNav)
main_test().run()
BUTTON SCREEN .PY FILE
from kivy.lang import Builder
from kivymd.uix.screen import MDScreen
button_screen_kv = '''
<button_screen>:
MDGridLayout:
cols: 1
size: root.width, root.height
spacing: 40
md_bg_color: [0,0,.1,.1]
MDGridLayout:
cols: 1
size_hint_y: None
height: 40
MDGridLayout:
cols: 1
Button:
text: "Click to add card"
on_release:
root.add_card("card 1")
MDGridLayout:
id: add_card_here_id
cols: 1
'''
md_card_kv = '''
MDCard:
orientation: 'vertical'
size_hint: None, None
size: "360dp", "120dp"
ripple_behavior: True
on_release:
root.option("MDCard was clicked")
MDLabel:
id: LabelTextID
text: "this is an MDCard"
halign: 'center'
'''
class button_screen(MDScreen):
def __init__(self, **kwargs):
super().__init__(**kwargs)
Builder.load_string(button_screen_kv)
self.md_card_widget = Builder.load_string(md_card_kv)
def option(self, string):
print(f"{string}")
def add_card(self, *args):
self.ids.add_card_here_id.add_widget(self.md_card_widget)
I came up with the following that works however, I am still new to programming so I don't know if this is a stable solution. Please advise me there
The Solution:
I added another class class user_card(MDGridLayout) in the buttonscreen.py and placed the kv string there.
I set that class as the root widget in the kv string
in the init method I placed a function that will return the kv string return self.user_card_string
then I added that class as a parameter in the add_widget and passed the col as an argument: self.ids.add_card_here_id.add_widget(user_card(cols=1))
Everything works but I have never used two classes before. So I am unsure if this will present a future problem.
button_screen.py:
from kivy.lang import Builder
from kivymd.uix.gridlayout import MDGridLayout
from kivymd.uix.screen import MDScreen
button_screen_kv = '''
<button_screen>:
MDGridLayout:
cols: 1
size: root.width, root.height
spacing: 40
md_bg_color: [0,0,.1,.1]
MDGridLayout:
cols: 1
size_hint_y: None
height: 40
MDGridLayout:
cols: 1
Button:
text: "Click to add card"
on_release:
root.add_card("card 1")
MDGridLayout:
id: add_card_here_id
cols: 1
'''
md_card_kv = '''
<user_card>:
MDGridLayout:
cols: 1
MDCard:
orientation: 'vertical'
size_hint: None, None
size: "360dp", "120dp"
ripple_behavior: True
on_release:
root.option()
MDLabel:
id: LabelTextID
text: "this is an MDCard"
halign: 'center'
'''
class user_card(MDGridLayout):
user_card_string = Builder.load_string(md_card_kv)
def __init__(self, *args, **kwargs):
super().__init__(**kwargs)
self.load_card()
def option(self, *args):
print("MDCard was clicked")
def load_card(self):
return self.user_card_string
class button_screen(MDScreen):
def __init__(self, **kwargs):
super().__init__(**kwargs)
Builder.load_string(button_screen_kv)
def add_card(self, *args):
self.ids.add_card_here_id.add_widget(user_card(cols=1))
Problem
I have a screen (OrderScreen) that populates with buttons if there is data to be processed. I would like the user to click one of the buttons to be brought to another screen (MenuScreen) to process the data. While my intention is to populate the next screen with data from the button, I am currently just trying to get the ScreenManager to change to the next screen after a button press. I added a pass_data() method to the OrderButton and tried to trigger the screen manager there but self.manager.current and root.manager.current were throwing exceptions. Any help would be greatly appreciated.
recycleview_test.py
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label
from kivy.uix.recycleview import RecycleView
from kivy.uix.screenmanager import ScreenManager, Screen
from random import randint
class MenuScreen(Screen):
def quit(self):
App.get_running_app.stop()
Window.close()
class OrderScreen(Screen):
pass
class OrderButton(Button):
def __init__(self, **kwargs):
super(OrderButton, self).__init__(**kwargs)
def pass_data(self):
print("button pushed")
class OrderScroll(RecycleView):
def __init__(self, **kwargs):
super(OrderScroll, self).__init__(**kwargs)
self.data = [{'text': str(f"Make {randint(10, 25)} items from package #{randint(1,4)}")} for x in range(12)]
class WindowManager(ScreenManager):
pass
class RecycleApp(App):
def build(self):
return WindowManager()
if __name__ == "__main__":
RecycleApp().run()
recycle.kv
#:import Factory kivy.factory.Factory
#: import ScreenManager kivy.uix.screenmanager.ScreenManager
#: import Screen kivy.uix.screenmanager.ScreenManager
#:import App kivy.app.App
<OrderScroll>:
viewclass: 'OrderButton'
manager: None
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
padding: 20
spacing: 10
<OrderButton>:
manager: None
font_size: 32
bold: True
on_release:
root.pass_data()
<WindowManager>:
id: screen_manager
OrderScreen:
id: order_screen
name: "OrderScreen"
manager: screen_manager
MenuScreen:
id: menu_screen
name: 'MenuScreen'
manager: screen_manager
<OrderScreen>:
BoxLayout:
orientation: "vertical"
Label:
text: "Data Buttons"
font_size: 64
size_hint_y: None
# pos_hint: {"x":0, "y":1}
height: 200
OrderScroll:
<MenuScreen>:
BoxLayout:
orientation: "vertical"
Label:
text: "Made it"
font_size: 64
FloatLayout:
Button:
text: 'Keep going'
font_size: 48
size_hint: .8,.5
pos_hint: {"center_x": .5, "center_y": .1}
FloatLayout:
Button:
text: 'Quit'
size_hint: .15,.3
pos_hint: {"center_x": .5, "center_y": .5}
on_release:
root.quit()
Try to create an object of screen manager:
class RecycleApp(App):
def build(self):
self.sm = WindowManager()
return self.sm
And then access it by:
App.get_running_app().sm.current = 'MenuScreen' # in Python
app.sm.current = 'MenuScreen' # in kv
I would like to remove specific row from the gridlayout with delete button. Rows are created in popup. Im able to add delete button to each row but cant figure out how to add logic in it.
Here is the codes i have tried. I played with it for a while. I tried it many ways and this is just where i stopped.
Py.
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.screenmanager import Screen, ScreenManager
from kivy.properties import StringProperty, BooleanProperty, ObjectProperty
from kivy.uix.textinput import TextInput
class Row(BoxLayout):
x1 = StringProperty('')
x2 = StringProperty('')
x3 = BooleanProperty(False)
x4 = ObjectProperty()
def __init__(self, x1, x2, x3, x4, **kwargs):
super(Row, self).__init__(**kwargs)
self.x1 = x1
self.x2 = x2
self.x3 = x3
self.x4 = x4
def remove_row(self):
self.remove_widget(Row)
class MyPopup(Popup):
pass
class MainScreen(Screen):
pass
class SecondScreen(Screen):
def fire_popup(self):
pops = MyPopup()
pops.open()
class ScreenManagement(ScreenManager):
def changescreen(self, value):
try:
if value !='main':
self.current = value
except:
print('No Screen named'+ value)
class testiApp(App):
def build(self):
self.title = 'Hello'
def add_more(self, x1, x2, x3, x4):
addbutton = self.root.get_screen('Page2').ids.empty
addbutton.add_widget(Row(x1, x2, x3, x4))
def remove(self):
container = self.root.get_screen('Page2').ids.empty
if len(container.children) > 0:
container.remove_widget(container.children[0])
testiApp().run()
KV.
<MyPopup>:
id:pop
size_hint: .4, .4
auto_dismiss: False
title: 'XXX!!'
BoxLayout:
orientation:'vertical'
BoxLayout:
orientation:'horizontal'
Label:
text:'X1'
TextInput:
id: X1
Label:
text:'X2'
TextInput:
id:X2
CheckBox:
id:X3
Button:
id:X4
text:'Delete'
BoxLayout:
orientation:'horizontal'
Button:
text:'Lisää'
on_release: app.add_more(X1.text, X2.text, X3.active, X4)
Button:
text: 'Close'
on_press: pop.dismiss()
<Row>:
x1:''
x2:''
x3:False
x4:
Label:
text: root.x1
Label:
text: root.x2
CheckBox:
active: root.x3
Button:
text:'poista'
on_release: root.remove_row()
ScreenManagement:
MainScreen:
name:'Main'
SecondScreen:
name:'Page2'
<MainScreen>:
name:'Main'
BoxLayout:
orientation:'vertical'
GridLayout:
id:container
cols:2
Label:
text:'testfield1'
TextInput:
id: textfield1
Label:
text:'testfield2'
TextInput:
id: textfield2
Button:
text:'Next Page'
on_release: app.root.current ='Page2'
<SecondScreen>:
name:'Page2'
BoxLayout:
orientation:'vertical'
BoxLayout:
orientation:'vertical'
Label:
text:'Popup Test'
ScrollView:
bar_width: 5
bar_color: 1,0,0,1 #red
bar_inactive_color: 0,0,1,1 #blue
effect_cls: 'ScrollEffect'
scroll_type:['bars','content']
GridLayout:
orientation: "vertical"
size_hint_y: None
height: self.minimum_height
row_default_height: 60
cols:1
id:empty
BoxLayout:
Button:
text:'Open Popup'
on_press: root.fire_popup()
Button:
text:'remove'
on_release: app.remove()
Question 2 - Popup message to confirm delete
... want that Poista(Delete) button to open popup asking " are you
sure? Yes or No" How should i bind the remove_row?
Solution
kv file
Create a class rule, <ConfirmDeleteRow>: with inheritance of Popup widget
The content of the Popup widget is a Label widget with text of 'Are you sure?', and two Button widgets with text of 'Yes', and 'No' respectively.
Using on_release event to bind the 'Yes' button to invoke remove_row() method
Using on_release event to bind both buttons to close the popup window by invoking dismiss() method
Bind the delete button to invoke a new method, confirm_delete()
Snippets - kv file
<ConfirmDeleteRow>: # class rule
size_hint: .4, .4
auto_dismiss: False
title: 'Delete'
BoxLayout: # content
orientation:'vertical'
Label:
text: 'Are you sure?'
BoxLayout:
size_hint: 1, 0.2
Button:
text: 'Yes'
on_release:
root.dismiss()
root.row.remove_row()
Button:
text: 'No'
on_release:
root.dismiss()
...
<Row>:
x1:''
...
Button:
text:'poista'
on_release: root.confirm_delete()
Py file
Implement class ConfirmDeleteRow() with a new class attribute, row = ObjectProperty(None) and a constructor accepting an additional parameter, row
Implement a new method, confirm_delete() to instantiate ConfirmDeleteRow() and pass self (i.e. row) as argument
Snippets - py file
class ConfirmDeleteRow(Popup):
row = ObjectProperty(None)
def __init__(self, row, **kwargs):
super(ConfirmDeleteRow, self).__init__(**kwargs)
self.row = row # save row object
class Row(BoxLayout):
...
def confirm_delete(self):
confirm_delete_row = ConfirmDeleteRow(self) # pass self / row object
confirm_delete_row.open()
Question 1 - remove specific row
... would like to remove specific row from the gridlayout with delete
button
Solution
When the button, 'poista' (delete) is pressed, self in remove_row() method is referring to the instantiated Row object for that specific row in the ScrollView. Therefore, to remove that specific row, you have to refer to its parent in order to remove it/child from the parent.
Replace self.remove_widget(Row) with self.parent.remove_widget(self)
Snippets
def remove_row(self):
self.parent.remove_widget(self)
Output
Im getting empty box character instead of Ä character. How to make them show on my kivy application. I read some posts suggesting changing font type to some which support these characters. i tried few but it didnt seem solving it.
Tried pretty basic Calibri font and also just randomly picked font which was said to be suitable with my languange( AlegreyaSansSC)
Python file:
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.screenmanager import Screen, ScreenManager
from kivy.properties import StringProperty, BooleanProperty
class Row(BoxLayout):
x1 = StringProperty('')
x2 = StringProperty('')
x3 = BooleanProperty(False)
def __init__(self, x1, x2, x3, **kwargs):
super(Row, self).__init__(**kwargs)
self.x1 = x1
self.x2 = x2
self.x3 = x3
class MyPopup(Popup):
pass
class MainScreen(Screen):
pass
class SecondScreen(Screen):
def fire_popup(self):
pops = MyPopup()
pops.open()
class ScreenManagement(ScreenManager):
def changescreen(self, value):
try:
if value !='main':
self.current = value
except:
print('No Screen named'+ value)
class testiApp(App):
def build(self):
self.title = 'Hello'
def add_more(self, x1, x2, x3):
addbutton = self.root.get_screen('Page2').ids.empty
addbutton.add_widget(Row(x1, x2, x3))
def remove(self):
container = self.root.get_screen('Page2').ids.empty
if len(container.children) > 0:
container.remove_widget(container.children[0])
testiApp().run()
KV. file:
<MyPopup>:
id:pop
size_hint: .4, .4
auto_dismiss: False
title: 'XXX!!'
BoxLayout:
orientation:'vertical'
BoxLayout:
orientation:'horizontal'
Label:
text:'X1'
TextInput:
id: X1
Label:
text:'X2'
TextInput:
id:X2
CheckBox:
id:X3
BoxLayout:
orientation:'horizontal'
Button:
text:'Lisää'
on_release: app.add_more(X1.text, X2.text, X3.active)
Button:
text: 'Close'
on_press: pop.dismiss()
<Row>:
x1:''
x2:''
x3:False
Label:
text: root.x1
Label:
text: root.x2
CheckBox:
active: root.x3
ScreenManagement:
MainScreen:
name:'Main'
SecondScreen:
name:'Page2'
<MainScreen>:
name:'Main'
BoxLayout:
Button:
text:'Next Page'
on_release: app.root.current ='Page2'
<SecondScreen>:
name:'Page2'
BoxLayout:
orientation:'vertical'
BoxLayout:
orientation:'vertical'
Label:
text:'Popup Test'
ScrollView:
bar_width: 5
bar_color: 1,0,0,1 #red
bar_inactive_color: 0,0,1,1 #blue
effect_cls: 'ScrollEffect'
scroll_type:['bars','content']
GridLayout:
orientation: "vertical"
size_hint_y: None
height: self.minimum_height
row_default_height: 60
cols:1
id:empty
BoxLayout:
Button:
text:'Open Popup'
on_press: root.fire_popup()
Button:
text:'Add'
on_release: app.add_more()
Button:
text:'remove'
on_release: app.remove()
Question
Seems that problem happens only if i use separate py. and kv file.
Answer
I don't think the problem is caused by separate py and kv file. The following example displayed the character correctly.
main.py
from kivy.base import runTouchApp
from kivy.lang import Builder
runTouchApp(Builder.load_file("main.kv"))
main.kv
GridLayout:
cols: 2
Label:
text: 'Alegreya Sans SC font'
Label:
text: 'Roboto font (Default)'
Label:
text: 'Ä'
font_size: 56
font_name: '/home/iam/share/fonts/Alegreya_Sans_SC/AlegreyaSansSC-Medium.ttf'
Label:
text: 'Ä'
font_size: 56
Problem
I'm getting empty box character instead of Ä character. How to make
them show on my kivy application.
Solution
Download and extract Alegreya Sans SC font from Google Fonts. This font is under Open Font License
Add attribute, font_name: and provide the path to the extracted folder plus the type of font (e.g. AlegreyaSansSC-Medium.ttf).
Example
The following example illustrates displaying character, Ä using attribute, font_name to use different font. The default font use by Kivy is Roboto.
main-kv.py
from kivy.base import runTouchApp
from kivy.lang import Builder
runTouchApp(Builder.load_string("""
GridLayout:
cols: 2
Label:
text: 'Alegreya Sans SC font'
Label:
text: 'Roboto font (Default)'
Label:
text: 'Ä'
font_size: 56
font_name: '/home/iam/share/fonts/Alegreya_Sans_SC/AlegreyaSansSC-Medium.ttf'
Label:
text: 'Ä'
font_size: 56
"""))
Output
After much headbanging, I've created an app that opens the FileChooser and picks an image. A function will then transform the image and change it on the screen.
< FirstScreen > is just something to start with, relatively unimportant.
< SecondScreen > is the file chooser. The path may need editing. < ThirdScreen > shoudl show the image along with buttons that will eventually lead elsewhere.
I suspect the problem is that the line
sm.current = "_third_screen_"
is creating a new instance separate to everything else I've passed items too. How do I show the image I selected?
from kivy.lang import Builder
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty, StringProperty
Builder.load_string("""
<MyScreenManager>:
FirstScreen:
SecondScreen:
ThirdScreen:
<FirstScreen>:
name: '_first_screen_'
BoxLayout:
orientation: "horizontal"
Label:
id: first_screen_label
text: "Hi, I'm the home page"
BoxLayout:
orientation: "vertical"
Button:
text: "Okay!"
on_press: root.manager.current = '_second_screen_'
Button:
text: "Cancel!"
on_press: app.stop()
<SecondScreen>:
name: '_second_screen_'
id: file_chooser
BoxLayout:
id: file_chooser_box_layout
orientation: "horizontal"
Button
text: "Open"
on_press:
root.callback_image_and_other_stuff(file_chooser_list_view.selection)
FileChooserListView:
id: file_chooser_list_view
<ThirdScreen>:
name: '_third_screen_'
BoxLayout:
orientation: "vertical"
id: third_screen
Label:
id: main_title
text: "Upload"
size_hint: (1, 0.1)
Image:
id: main_image
source: root.img
size_hint: (1, 0.75)
BoxLayout:
orientation: "horizontal"
padding: 10
size_hint: (1, 0.15)
Button:
text: "Okay"
size_hint: (0.5, 1)
on_press: image_viewer.image_accepted_by_user(filechooser.selection)
Button:
text: "Cancel"
size_hint: (0.5, 1)
on_press: root.manager.current = '_first_screen_'
""")
class FirstScreen(Screen):
pass
class SecondScreen(Screen):
def callback_image_and_other_stuff(self, new_image_address):
# do other stuff here also, then pass new_image_address along
new_image_address = new_image_address[0].replace("\\", "/")
third_screen = ThirdScreen()
third_screen.callback_image(new_image_address)
class ThirdScreen(Screen):
img = ObjectProperty(None)
def __init__(self, **kwargs):
super(Screen, self).__init__(**kwargs)
def callback_image(self, new_image_address):
sm.current = "_third_screen_"
self.img = new_image_address
self.ids.main_image.source = self.img
print(self.img)
# Create the screen manager
sm = ScreenManager() # Problem?
sm.add_widget(FirstScreen(name='_first_screen_'))
sm.add_widget(SecondScreen(name='_second_screen_'))
sm.add_widget(ThirdScreen(name='_third_screen_'))
class MyApp(App):
def build(self):
return sm
if __name__ == '__main__':
MyApp().run()
Every time you use some_obj = SomClass() you are creating a new object, in your case that is what you are doing, you are creating a new ThirdScreen different from the one shown by that you do not observe the image, the solution is that you have to access to the initial object using the ScreenManager and name screen.
from kivy.lang import Builder
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty, StringProperty
Builder.load_string("""
<FirstScreen>:
BoxLayout:
orientation: "horizontal"
Label:
id: first_screen_label
text: "Hi, I'm the home page"
BoxLayout:
orientation: "vertical"
Button:
text: "Okay!"
on_press: root.manager.current = '_second_screen_'
Button:
text: "Cancel!"
on_press: app.stop()
<SecondScreen>:
id: file_chooser
BoxLayout:
id: file_chooser_box_layout
orientation: "horizontal"
Button
text: "Open"
on_press:
root.callback_image_and_other_stuff(file_chooser_list_view.selection)
FileChooserListView:
id: file_chooser_list_view
<ThirdScreen>:
BoxLayout:
orientation: "vertical"
id: third_screen
Label:
id: main_title
text: "Upload"
size_hint: (1, 0.1)
Image:
id: main_image
source: root.img
size_hint: (1, 0.75)
BoxLayout:
orientation: "horizontal"
padding: 10
size_hint: (1, 0.15)
Button:
text: "Okay"
size_hint: (0.5, 1)
on_press: image_viewer.image_accepted_by_user(filechooser.selection)
Button:
text: "Cancel"
size_hint: (0.5, 1)
on_press: root.manager.current = '_first_screen_'
""")
class FirstScreen(Screen):
pass
class SecondScreen(Screen):
def callback_image_and_other_stuff(self, new_image_address):
if new_image_address:
third_screen = self.manager.get_screen("_third_screen_")
# do other stuff here also, then pass new_image_address along
new_image_address = new_image_address[0].replace("\\", "/")
third_screen.callback_image(new_image_address)
class ThirdScreen(Screen):
img = ObjectProperty(None)
def __init__(self, **kwargs):
super(Screen, self).__init__(**kwargs)
def callback_image(self, new_image_address):
sm.current = "_third_screen_"
self.img = new_image_address
self.ids.main_image.source = self.img
print(self.img)
# Create the screen manager
sm = ScreenManager() # Problem?
sm.add_widget(FirstScreen(name='_first_screen_'))
sm.add_widget(SecondScreen(name='_second_screen_'))
sm.add_widget(ThirdScreen(name='_third_screen_'))
class MyApp(App):
def build(self):
return sm
if __name__ == '__main__':
MyApp().run()