b6a647cc01
Adds a `default()` shorthand for `Default::default()` ... because life is too short to constantly type `Default::default()`.
```rust
use bevy::prelude::*;
#[derive(Default)]
struct Foo {
bar: usize,
baz: usize,
}
// Normally you would do this:
let foo = Foo {
bar: 10,
..Default::default()
};
// But now you can do this:
let foo = Foo {
bar: 10,
..default()
};
```
The examples have been adapted to use `..default()`. I've left internal crates as-is for now because they don't pull in the bevy prelude, and the ergonomics of each case should be considered individually.
76 lines
2.5 KiB
Rust
76 lines
2.5 KiB
Rust
use bevy::prelude::*;
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/// This example illustrates how to create a button that changes color and text based on its
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/// interaction state.
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(button_system)
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.run();
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}
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const NORMAL_BUTTON: Color = Color::rgb(0.15, 0.15, 0.15);
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const HOVERED_BUTTON: Color = Color::rgb(0.25, 0.25, 0.25);
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const PRESSED_BUTTON: Color = Color::rgb(0.35, 0.75, 0.35);
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fn button_system(
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mut interaction_query: Query<
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(&Interaction, &mut UiColor, &Children),
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(Changed<Interaction>, With<Button>),
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>,
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mut text_query: Query<&mut Text>,
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) {
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for (interaction, mut color, children) in interaction_query.iter_mut() {
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let mut text = text_query.get_mut(children[0]).unwrap();
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match *interaction {
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Interaction::Clicked => {
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text.sections[0].value = "Press".to_string();
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*color = PRESSED_BUTTON.into();
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}
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Interaction::Hovered => {
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text.sections[0].value = "Hover".to_string();
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*color = HOVERED_BUTTON.into();
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}
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Interaction::None => {
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text.sections[0].value = "Button".to_string();
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*color = NORMAL_BUTTON.into();
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}
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}
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}
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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// ui camera
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commands.spawn_bundle(UiCameraBundle::default());
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commands
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.spawn_bundle(ButtonBundle {
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style: Style {
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size: Size::new(Val::Px(150.0), Val::Px(65.0)),
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// center button
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margin: Rect::all(Val::Auto),
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// horizontally center child text
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justify_content: JustifyContent::Center,
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// vertically center child text
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align_items: AlignItems::Center,
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..default()
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},
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color: NORMAL_BUTTON.into(),
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..default()
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})
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.with_children(|parent| {
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parent.spawn_bundle(TextBundle {
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text: Text::with_section(
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"Button",
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TextStyle {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 40.0,
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color: Color::rgb(0.9, 0.9, 0.9),
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},
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Default::default(),
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),
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..default()
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});
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});
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}
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