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from dataclasses import fields
import mesop as me
def load(e: me.LoadEvent):
me.set_theme_mode("system")
@me.page(
on_load=load,
security_policy=me.SecurityPolicy(
allowed_iframe_parents=["https://google.github.io", "https://huggingface.co."]
),
path="/headers",
)
def app():
is_mobile = me.viewport_size().width < 640
with me.box(style=me.Style(margin=me.Margin(bottom=15))):
# Two section basic header with fluid width.
# As an example, we don't use mobile view here since the header is short enough.
with header(max_width=None):
with header_section():
me.text(
"Mesop", type="headline-6", style=me.Style(margin=me.Margin(bottom=0))
)
with header_section():
me.button("Home")
me.button("About")
me.button("FAQ")
with me.box(style=me.Style(margin=me.Margin(bottom=15))):
# Two section basic header.
with header(is_mobile=is_mobile):
with header_section():
me.text(
"Mesop", type="headline-6", style=me.Style(margin=me.Margin(bottom=0))
)
with header_section():
me.button("Home")
me.button("About")
me.button("FAQ")
with me.box(style=me.Style(margin=me.Margin(bottom=15))):
# Three section basic header.
with header(is_mobile=is_mobile):
with header_section():
me.text(
"Mesop", type="headline-6", style=me.Style(margin=me.Margin(bottom=0))
)
with header_section():
me.button("Home")
me.button("About")
me.button("FAQ")
with header_section():
me.button("Login", type="flat")
with me.box(style=me.Style(margin=me.Margin(bottom=15))):
# Centered header with overrides and icons
with header(is_mobile=is_mobile, style=me.Style(justify_content="center")):
with header_section():
with me.content_button(
style=me.Style(
padding=me.Padding.symmetric(vertical=30, horizontal=25)
)
):
me.icon("home")
me.text("Home")
with me.content_button(
style=me.Style(
padding=me.Padding.symmetric(vertical=30, horizontal=25)
)
):
me.icon("info")
me.text("About")
with me.content_button(
style=me.Style(
padding=me.Padding.symmetric(vertical=30, horizontal=25)
)
):
me.icon("contact_support")
me.text("FAQ")
with me.content_button(
style=me.Style(
padding=me.Padding.symmetric(vertical=30, horizontal=25)
)
):
me.icon("login")
me.text("Login")
with me.box(style=me.Style(margin=me.Margin(bottom=15))):
# Header with overridden background
with header(
is_mobile=is_mobile, style=me.Style(background="#0F0F11", color="#E3E3E3")
):
with header_section():
me.text(
"Mesop", type="headline-6", style=me.Style(margin=me.Margin(bottom=0))
)
with header_section():
me.button("Home", type="stroked", style=me.Style(color="#E3E3E3"))
me.button("About", type="stroked", style=me.Style(color="#E3E3E3"))
me.button("FAQ", type="stroked", style=me.Style(color="#E3E3E3"))
with header_section():
me.button("Login", type="flat")
@me.content_component
def header(
*,
style: me.Style | None = None,
is_mobile: bool = False,
max_width: int | None = 1000,
):
"""Creates a simple header component.
Args:
style: Override the default styles, such as background color, etc.
is_mobile: Use mobile layout. Arranges each section vertically.
max_width: Sets the maximum width of the header. Use None for fluid header.
"""
default_flex_style = (
_DEFAULT_MOBILE_FLEX_STYLE if is_mobile else _DEFAULT_FLEX_STYLE
)
if max_width and me.viewport_size().width >= max_width:
default_flex_style = merge_styles(
default_flex_style,
me.Style(width=max_width, margin=me.Margin.symmetric(horizontal="auto")),
)
# The style override is a bit hacky here since we apply the override styles to both
# boxes here which could cause problems depending on what styles are added.
with me.box(style=merge_styles(_DEFAULT_STYLE, style)):
with me.box(style=merge_styles(default_flex_style, style)):
me.slot()
@me.content_component
def header_section():
"""Adds a section to the header."""
with me.box(style=me.Style(display="flex", gap=5)):
me.slot()
def merge_styles(
default: me.Style, overrides: me.Style | None = None
) -> me.Style:
"""Merges two styles together.
Args:
default: The starting style
overrides: Any set styles will override styles in default
"""
if not overrides:
overrides = me.Style()
default_fields = {
field.name: getattr(default, field.name) for field in fields(me.Style)
}
override_fields = {
field.name: getattr(overrides, field.name)
for field in fields(me.Style)
if getattr(overrides, field.name) is not None
}
return me.Style(**default_fields | override_fields)
_DEFAULT_STYLE = me.Style(
background=me.theme_var("surface-container"),
border=me.Border.symmetric(
vertical=me.BorderSide(
width=1,
style="solid",
color=me.theme_var("outline-variant"),
)
),
padding=me.Padding.all(10),
)
_DEFAULT_FLEX_STYLE = me.Style(
align_items="center",
display="flex",
gap=5,
justify_content="space-between",
)
_DEFAULT_MOBILE_FLEX_STYLE = me.Style(
align_items="center",
display="flex",
flex_direction="column",
gap=12,
justify_content="center",
)
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