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//! Button Demo
//!
//! Demonstrates Material Design 3 buttons: elevated, filled, filled tonal,
//! outlined, and text buttons.
use bevy::prelude::*;
use bevy_material_ui::prelude::*;
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_plugins(MaterialUiPlugin)
.add_plugins(TelemetryPlugin)
.add_systems(Startup, setup)
.run();
}
fn setup(mut commands: Commands, theme: Res<MaterialTheme>, telemetry: Res<TelemetryConfig>) {
commands.spawn(Camera2d);
commands
.spawn((
Node {
width: Val::Percent(100.0),
height: Val::Percent(100.0),
flex_direction: FlexDirection::Column,
justify_content: JustifyContent::FlexStart,
align_items: AlignItems::Center,
row_gap: Val::Px(16.0),
padding: UiRect::all(Val::Px(24.0)),
..default()
},
BackgroundColor(theme.surface),
))
.insert_test_id("button_demo/root", &telemetry)
.with_children(|root| {
// Match the showcase layout: 5 button variants + 2 segmented button groups.
root.spawn(Node {
flex_direction: FlexDirection::Column,
row_gap: Val::Px(16.0),
width: Val::Percent(100.0),
max_width: Val::Px(560.0),
..default()
})
.with_children(|col| {
col.spawn(Node {
flex_direction: FlexDirection::Row,
column_gap: Val::Px(16.0),
flex_wrap: FlexWrap::Wrap,
margin: UiRect::vertical(Val::Px(8.0)),
..default()
})
.with_children(|row| {
spawn_interactive_button(
row,
&theme,
&telemetry,
"button_demo/variant/filled",
"Filled",
ButtonVariant::Filled,
);
spawn_interactive_button(
row,
&theme,
&telemetry,
"button_demo/variant/outlined",
"Outlined",
ButtonVariant::Outlined,
);
spawn_interactive_button(
row,
&theme,
&telemetry,
"button_demo/variant/text",
"Text",
ButtonVariant::Text,
);
spawn_interactive_button(
row,
&theme,
&telemetry,
"button_demo/variant/elevated",
"Elevated",
ButtonVariant::Elevated,
);
spawn_interactive_button(
row,
&theme,
&telemetry,
"button_demo/variant/tonal",
"Tonal",
ButtonVariant::FilledTonal,
);
});
col.spawn((
Text::new("Button Groups"),
TextFont {
font_size: 16.0,
..default()
},
TextColor(theme.on_surface),
Node {
margin: UiRect::top(Val::Px(8.0)),
..default()
},
));
col.spawn(Node {
flex_direction: FlexDirection::Row,
align_items: AlignItems::FlexStart,
column_gap: Val::Px(24.0),
flex_wrap: FlexWrap::Wrap,
margin: UiRect::vertical(Val::Px(8.0)),
..default()
})
.with_children(|row| {
// Horizontal segmented (single selection)
row.spawn((
MaterialButtonGroup::new()
.single_selection(true)
.selection_required(true)
.horizontal(),
Node { ..default() },
))
.insert_test_id("button_demo/group/period", &telemetry)
.with_children(|group| {
spawn_toggle_button(
group,
&theme,
&telemetry,
"button_demo/group/period/day",
"Day",
true,
);
spawn_toggle_button(
group,
&theme,
&telemetry,
"button_demo/group/period/week",
"Week",
false,
);
spawn_toggle_button(
group,
&theme,
&telemetry,
"button_demo/group/period/month",
"Month",
false,
);
});
// Vertical segmented (single selection)
row.spawn((
MaterialButtonGroup::new()
.single_selection(true)
.selection_required(true)
.vertical(),
Node { ..default() },
))
.insert_test_id("button_demo/group/priority", &telemetry)
.with_children(|group| {
spawn_toggle_button(
group,
&theme,
&telemetry,
"button_demo/group/priority/low",
"Low",
false,
);
spawn_toggle_button(
group,
&theme,
&telemetry,
"button_demo/group/priority/med",
"Med",
true,
);
spawn_toggle_button(
group,
&theme,
&telemetry,
"button_demo/group/priority/high",
"High",
false,
);
});
});
});
});
}
fn spawn_toggle_button(
parent: &mut ChildSpawnerCommands,
theme: &MaterialTheme,
telemetry: &TelemetryConfig,
test_id: &str,
label: &str,
checked: bool,
) {
let button = MaterialButton::new(label)
.with_variant(ButtonVariant::Outlined)
.checkable(true)
.checked(checked);
let text_color = button.text_color(theme);
let bg_color = button.background_color(theme);
let border_color = button.border_color(theme);
parent
.spawn((
button,
Button,
Interaction::None,
RippleHost::new(),
Node {
padding: UiRect::axes(Val::Px(24.0), Val::Px(10.0)),
border: UiRect::all(Val::Px(1.0)),
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
..default()
},
BackgroundColor(bg_color),
BorderColor::all(border_color),
BorderRadius::all(Val::Px(CornerRadius::FULL)),
))
.insert_test_id(test_id, telemetry)
.with_children(|btn| {
btn.spawn((
Text::new(label),
TextFont {
font_size: 14.0,
..default()
},
TextColor(text_color),
));
});
}
fn spawn_interactive_button(
parent: &mut ChildSpawnerCommands,
theme: &MaterialTheme,
telemetry: &TelemetryConfig,
test_id: &str,
label: &str,
variant: ButtonVariant,
) {
let button = MaterialButton::new(label).with_variant(variant);
let text_color = button.text_color(theme);
let bg_color = button.background_color(theme);
let border_color = button.border_color(theme);
let has_border = variant == ButtonVariant::Outlined;
let elevation = button.elevation();
parent
.spawn((
button,
Button,
Interaction::None,
RippleHost::new(),
Node {
padding: UiRect::axes(Val::Px(24.0), Val::Px(10.0)),
border: UiRect::all(Val::Px(if has_border { 1.0 } else { 0.0 })),
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
..default()
},
BackgroundColor(bg_color),
BorderColor::all(border_color),
BorderRadius::all(Val::Px(CornerRadius::FULL)),
elevation.to_box_shadow(),
))
.insert_test_id(test_id, telemetry)
.with_children(|btn| {
btn.spawn((
Text::new(label),
TextFont {
font_size: 14.0,
..default()
},
TextColor(text_color),
));
});
}