mirror of
https://github.com/bevyengine/bevy
synced 2024-12-13 14:52:28 +00:00
015f2c69ca
# Objective Continue improving the user experience of our UI Node API in the direction specified by [Bevy's Next Generation Scene / UI System](https://github.com/bevyengine/bevy/discussions/14437) ## Solution As specified in the document above, merge `Style` fields into `Node`, and move "computed Node fields" into `ComputedNode` (I chose this name over something like `ComputedNodeLayout` because it currently contains more than just layout info. If we want to break this up / rename these concepts, lets do that in a separate PR). `Style` has been removed. This accomplishes a number of goals: ## Ergonomics wins Specifying both `Node` and `Style` is now no longer required for non-default styles Before: ```rust commands.spawn(( Node::default(), Style { width: Val::Px(100.), ..default() }, )); ``` After: ```rust commands.spawn(Node { width: Val::Px(100.), ..default() }); ``` ## Conceptual clarity `Style` was never a comprehensive "style sheet". It only defined "core" style properties that all `Nodes` shared. Any "styled property" that couldn't fit that mold had to be in a separate component. A "real" style system would style properties _across_ components (`Node`, `Button`, etc). We have plans to build a true style system (see the doc linked above). By moving the `Style` fields to `Node`, we fully embrace `Node` as the driving concept and remove the "style system" confusion. ## Next Steps * Consider identifying and splitting out "style properties that aren't core to Node". This should not happen for Bevy 0.15. --- ## Migration Guide Move any fields set on `Style` into `Node` and replace all `Style` component usage with `Node`. Before: ```rust commands.spawn(( Node::default(), Style { width: Val::Px(100.), ..default() }, )); ``` After: ```rust commands.spawn(Node { width: Val::Px(100.), ..default() }); ``` For any usage of the "computed node properties" that used to live on `Node`, use `ComputedNode` instead: Before: ```rust fn system(nodes: Query<&Node>) { for node in &nodes { let computed_size = node.size(); } } ``` After: ```rust fn system(computed_nodes: Query<&ComputedNode>) { for computed_node in &computed_nodes { let computed_size = computed_node.size(); } } ```
105 lines
3.3 KiB
Rust
105 lines
3.3 KiB
Rust
//! This example illustrates how to override the window scale factor imposed by the
|
|
//! operating system.
|
|
|
|
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) {
|
|
// camera
|
|
commands.spawn(Camera2d);
|
|
// root node
|
|
commands
|
|
.spawn(Node {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
justify_content: JustifyContent::SpaceBetween,
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// left vertical fill (border)
|
|
parent
|
|
.spawn((
|
|
Node {
|
|
width: Val::Px(300.0),
|
|
height: Val::Percent(100.0),
|
|
border: UiRect::all(Val::Px(2.0)),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgb(0.65, 0.65, 0.65)),
|
|
))
|
|
.with_child((
|
|
CustomText,
|
|
Text::new("Example text"),
|
|
TextFont {
|
|
font_size: 25.0,
|
|
..default()
|
|
},
|
|
Node {
|
|
align_self: AlignSelf::FlexEnd,
|
|
..default()
|
|
},
|
|
));
|
|
});
|
|
}
|
|
|
|
/// Set the title of the window to the current override
|
|
fn display_override(
|
|
mut window: Single<&mut Window>,
|
|
mut custom_text: Single<&mut Text, With<CustomText>>,
|
|
) {
|
|
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);
|
|
custom_text.0 = text;
|
|
}
|
|
|
|
/// This system toggles scale factor overrides when enter is pressed
|
|
fn toggle_override(input: Res<ButtonInput<KeyCode>>, mut window: Single<&mut Window>) {
|
|
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)));
|
|
}
|
|
}
|
|
|
|
/// This system changes the scale factor override when up or down is pressed
|
|
fn change_scale_factor(input: Res<ButtonInput<KeyCode>>, mut window: Single<&mut Window>) {
|
|
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)));
|
|
}
|
|
}
|