Positioning a text field inside a toolbar in Kivy - kivy

Question

I'm trying to put a textfield inside a toolbar with KivyMD, but the textfield is always directly against the right side of the window. I tried to adjust it with pos_hint, but none of the values I put for the x-coordinates moved it.
Screen:
canvas.before:
Rectangle:
pos: self.pos
size: self.size
source: 'assets/bg.png'
BoxLayout:
orientation: 'vertical'
MDToolbar:
id: toolbar
title: 'Placeholder'
elevation: 10
pos_hint: {"top": 1}
left_action_items: [['menu', lambda x: app.menu.open()]]
MDTextFieldRound:
id: textinput
icon_left: 'magnify'
pos_hint: {'x': 0.1 ,'center_y': 0.5, 'right': 0.3}
size_hint: {.6, .4}
text_color: 'white'
hint_text: 'Search'**strong text**
MDLabel:
text: 'Placeholder'
color: 'white'
halign: 'center'
Screenshot of toolbar
Any help is appreciated, thanks.

Answer 1

You can insert your widgets wherever you want, for this you can specify a position in the widget tree - add_widget(widget, index). I wrote a special get_widgets function for your solution, which goes through all the widgets in the class. In the example below, you can place the text field on the left, right, and center. Also examine the MDToolbar source code
from kivy.lang.builder import Builder
from kivy.metrics import dp
from kivy.clock import Clock
from kivy.weakproxy import WeakProxy
from kivymd.app import MDApp
from kivymd.uix.boxlayout import MDBoxLayout
from kivymd.uix.textfield import MDTextField
KV = """
MDScreen:
MDBoxLayout:
orientation: 'vertical'
MDToolbar:
id: toolbar
title: 'Placeholder'
pos_hint: {"top": 1}
MDLabel:
text: 'Placeholder'
color: 'white'
halign: 'center'
"""
class TestApp(MDApp):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.search_content = None
def build(self):
return Builder.load_string(KV)
def on_start(self):
Clock.schedule_once(lambda dt: self.add_search('left'))
#staticmethod
def get_widgets(root: WeakProxy, class_: str):
"""
:param root: root widget
:param class_: which subclass are we looking for
:return:
"""
widgets = []
for widget in root.walk():
if widget.__class__.__name__ == class_:
widgets.append(widget)
print(widget)
return widgets
def add_search(self, side: str):
"""
:param side: left/right/center
:return:
"""
box = self.get_widgets(self.root.ids.toolbar, 'MDBoxLayout')[0] # get root `MDBoxLayout`
if side == 'left':
index = 2
elif side == 'right':
index = 1
else:
index = 0
self.root.ids.toolbar.ids.label_title.size_hint = None, None
self.root.ids.toolbar.ids.label_title.opacity = 0
# NOTE: If you remove this `MDLabel`, you cant change `self.theme_cls.material_style`
# box.remove_widget(self.root.ids.toolbar.ids.label_title)
boxlayout = MDBoxLayout(padding=[dp(18), dp(0), dp(18), dp(18)])
self.search_content = MDTextField(icon_left='magnify',
mode='round',
color_mode="custom",
line_color_normal=(1, 0, 1, 1),
line_color_focus=(0, 0, 1, 1),
text_color_focus=self.theme_cls.text_color,
text_color_normal=self.theme_cls.text_color[0:3] + [0.7],
hint_text='Empty field',
)
boxlayout.add_widget(self.search_content)
box.add_widget(boxlayout, index)
TestApp().run()