scale_factor_override.rs:
use bevy::{prelude::*, window::WindowResolution};
#[derive(Component)]
struct CustomText;
fn main() {
App::new()
.add_plugins(DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
resolution: WindowResolution::new(500., 300.).with_scale_factor_override(1.0),
..default()
}),
..default()
}))
.add_systems(Startup, setup)
.add_systems(
Update,
(display_override, toggle_override, change_scale_factor),
)
.run();
}
fn setup(mut commands: Commands) {
commands.spawn(Camera2dBundle::default());
commands
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.0),
height: Val::Percent(100.0),
justify_content: JustifyContent::SpaceBetween,
..default()
},
..default()
})
.with_children(|parent| {
parent
.spawn(NodeBundle {
style: Style {
width: Val::Px(300.0),
height: Val::Percent(100.0),
border: UiRect::all(Val::Px(2.0)),
..default()
},
background_color: Color::srgb(0.65, 0.65, 0.65).into(),
..default()
})
.with_children(|parent| {
parent.spawn((
CustomText,
TextBundle::from_section(
"Example text",
TextStyle {
font_size: 30.0,
..default()
},
)
.with_style(Style {
align_self: AlignSelf::FlexEnd,
..default()
}),
));
});
});
}
fn display_override(
mut windows: Query<&mut Window>,
mut custom_text: Query<&mut Text, With<CustomText>>,
) {
let mut window = windows.single_mut();
let text = format!(
"Scale factor: {:.1} {}",
window.scale_factor(),
if window.resolution.scale_factor_override().is_some() {
"(overridden)"
} else {
"(default)"
}
);
window.title.clone_from(&text);
let mut custom_text = custom_text.single_mut();
custom_text.sections[0].value = text;
}
fn toggle_override(input: Res<ButtonInput<KeyCode>>, mut windows: Query<&mut Window>) {
let mut window = windows.single_mut();
if input.just_pressed(KeyCode::Enter) {
let scale_factor_override = window.resolution.scale_factor_override();
window
.resolution
.set_scale_factor_override(scale_factor_override.xor(Some(1.0)));
}
}
fn change_scale_factor(input: Res<ButtonInput<KeyCode>>, mut windows: Query<&mut Window>) {
let mut window = windows.single_mut();
let scale_factor_override = window.resolution.scale_factor_override();
if input.just_pressed(KeyCode::ArrowUp) {
window
.resolution
.set_scale_factor_override(scale_factor_override.map(|n| n + 1.0));
} else if input.just_pressed(KeyCode::ArrowDown) {
window
.resolution
.set_scale_factor_override(scale_factor_override.map(|n| (n - 1.0).max(1.0)));
}
}