I have an App with three toggle buttons in a fixed header that is an outside indented layout for screen manager. On initialisation, the Import screen must show i.e. self.ids.scrn_man.current = 'import_scn" and when a toggle button is pushed a next screen should show i.e. on_state: scrn_man.current = "settings_scrn".
But for some reason, only the header is showing and the screens do not want to transition. I don't get any errors.
I tried different layouts as my Apps main class inheritance including, FloatLayout, StackLayout and BoxLayout. I also made the header fixed with AnchorLayout and use a different layout as the inline layout for ScreenManager. If I remove the ScreenManager I see my widgets, but of course, I cannot transition. I did at first try using TabbedPanel to house my different widgets but I encountered a constant RefError: weak object reference if I added too many widgets (but that's not for now). So I re-designed with something I knew worked on a previous App albeit less complex.
Here is my faulty code:
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.stacklayout import StackLayout
from kivy.uix.togglebutton import ToggleButton
from kivy.lang import Builder
from kivy.uix.popup import Popup
from kivy.properties import StringProperty, ObjectProperty
Builder.load_string("""
<RoundedButton@Button>:
background_color: 0,0,0,0
canvas.before:
Color:
rgba: (.47,.47,.47,1) if self.state=='normal' else (1,.6,0,1)
RoundedRectangle:
pos: self.pos
size: self.size
radius: [8,]
<RoundedCancelButton@Button>:
background_color: 0,0,0,0
canvas.before:
Color:
rgba: (.47,.47,.47,1) if self.state=='normal' else (1,.2,.2,1)
RoundedRectangle:
pos: self.pos
size: self.size
radius: [8,]
<RoundedAcceptButton@Button>:
background_color: 0,0,0,0
canvas.before:
Color:
rgba: (.47,.47,.47,1) if self.state=='normal' else (.2,1,.6,1)
RoundedRectangle:
pos: self.pos
size: self.size
radius: [8,]
<TabbedContainer@ToggleButton>:
background_color: (1, .5, 0, 1)
background_normal: ''
size_hint_y: None
height: 50
size_hint_x: (1 / 3)
spacing: 30
<Tab>:
canvas.before:
Color:
rgba: (.89, .89, .89, 1)
Rectangle:
size: self.size
pos: self.pos
orientation: 'lr-tb'
BoxLayout:
orientation: 'horizontal'
size_hint_y: None
height: 30
canvas.before:
Color:
rgba: (1, .3, 0, 1)
Rectangle:
size: self.size
pos: self.pos
Label:
text: 'Test'
color: (1, 1, 1, 1)
size_hint_x: 1
StackLayout:
orientation: 'lr-tb'
Label:
text: ''
size_hint_x: 1
size_hint_y: None
height: 10
TabbedContainer:
id: import_tog
text: 'Import'
state: 'down'
group: 'admin_navs'
on_state: root.change_screen(self)
TabbedContainer:
id: calculate_tog
text: 'Calculate'
group: 'admin_navs'
on_state: root.change_screen(self)
TabbedContainer:
id: settings_tog
text: 'Settings'
group: 'admin_navs'
on_state: root.change_screen(self)
BoxLayout:
id: ui_content
padding: 10
ScreenManager: #Problem here I think
id: scrn_man
Screen:
id: import_scrn
name: 'import_scrn'
StackLayout:
orientation: 'lr-tb'
Label:
text: ''
size_hint_x: 1
Label:
text: ''
size_hint_x: 0.2
RoundedButton:
text: 'Choose File'
size_hint_x: 0.2
TextInput:
id: get_file
readonly: True
size_hint_x: 0.5
Label:
text: ''
size_hint_x: 0.1
Label:
text: ''
size_hint_x: 0.2
RoundedButton:
text: 'Import'
size_hint_x: 0.2
Label:
text: ''
size_hint_x: 0.6
StackLayout:
id: import_data_content
orientation: 'lr-tb'
size_hint_y: None
height: 90
Screen:
id: calculate_scrn
name: 'calculate_scrn'
Screen:
id: settings_scrn
name: 'settings_scrn'
StackLayout:
orientation: 'lr-tb'
size_hint_x: 0.5
Label:
text: ''
size_hint_x: 0.1
Button:
text: 'Add Employee'
size_hint_x: 0.2
Label:
text: ''
size_hint_x: 0.2
Button:
text: 'CSV'
size_hint_x: 0.2
Label:
text: ''
size_hint_x: 0.3
BoxLayout:
orientation: 'horizontal'
size_hint_x: 0.5
Label:
text: 'In Time'
size_hint_x: 0.7
TextInput:
size_hint_x: 0.3
Label:
text: 'Out Time'
size_hint_x: 0.7
TextInput:
size_hint_x: 0.3
""")
class TabbedContainer(ToggleButton):
pass
class FileChoosePopup(Popup):
load = ObjectProperty()
class RoundedButton(Button):
pass
class RoundedCancelButton(Button):
pass
class RoundedAcceptButton(Button):
pass
class Tab(StackLayout):
file_path = StringProperty("No file chosen")
the_popup = ObjectProperty(None)
def __init__(self, **kwargs):
super().__init__(**kwargs)
#load import window on initialisation
import_window = self.ids.import_scrn
self.ids.scrn_man.current = 'import_scrn'
def change_screen(self, instance):
if instance.text == 'Import':
self.ids.scrn_man.current = 'import_scrn'
elif instance.text == 'Calculate':
self.ids.scrn_man.current = 'calculate_scrn'
else:
self.ids.scrn_man.current = 'settings_scrn'
class TestApp(App):
def build(self):
return Tab()
if __name__ == '__main__':
TestApp().run()
I expect that the import screen must show on initialisation and screens transition on toggle button state: down. Can someone please give me some advice on how to make my App act as explained above?
Your screens are loading correctly according to your settings. You need to review your entire kv string looking at your size_hint settings. Check each item that contains children and make sure that the total of size_hint_x for its children is less than or equal to 1.0 and the same for size_hint_y.