mirror of
https://github.com/bevyengine/bevy
synced 2024-11-26 14:40:19 +00:00
eaac730617
# Objective `Size::width` sets the `height` field to `Val::DEFAULT` which is `Val::Undefined`, but the default for `Size` `height` is `Val::Auto`. `Size::height` has the same problem, but with the `width` field. The UI examples specify numeric values in many places where they could either be elided or replaced by composition of the Flex enum properties. related: https://github.com/bevyengine/bevy/pull/7468 fixes: https://github.com/bevyengine/bevy/issues/6498 ## Solution Change `Size::width` so it sets `height` to `Val::AUTO` and change `Size::height` so it sets `width` to `Val::AUTO`. Added some tests so this doesn't happen again. ## Changelog Changed `Size::width` so it sets the `height` to `Val::AUTO`. Changed `Size::height` so it sets the `width` to `Val::AUTO`. Added tests to `geometry.rs` for `Size` and `UiRect` to ensure correct behaviour. Simplified the UI examples. Replaced numeric values with the Flex property enums or elided them where possible, and removed the remaining use of auto margins. ## Migration Guide The `Size::width` constructor function now sets the `height` to `Val::Auto` instead of `Val::Undefined`. The `Size::height` constructor function now sets the `width` to `Val::Auto` instead of `Val::Undefined`.
84 lines
2.9 KiB
Rust
84 lines
2.9 KiB
Rust
//! This example illustrates how to create a button that changes color and text based on its
|
|
//! interaction state.
|
|
|
|
use bevy::{prelude::*, winit::WinitSettings};
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
// Only run the app when there is user input. This will significantly reduce CPU/GPU use.
|
|
.insert_resource(WinitSettings::desktop_app())
|
|
.add_startup_system(setup)
|
|
.add_system(button_system)
|
|
.run();
|
|
}
|
|
|
|
const NORMAL_BUTTON: Color = Color::rgb(0.15, 0.15, 0.15);
|
|
const HOVERED_BUTTON: Color = Color::rgb(0.25, 0.25, 0.25);
|
|
const PRESSED_BUTTON: Color = Color::rgb(0.35, 0.75, 0.35);
|
|
|
|
fn button_system(
|
|
mut interaction_query: Query<
|
|
(&Interaction, &mut BackgroundColor, &Children),
|
|
(Changed<Interaction>, With<Button>),
|
|
>,
|
|
mut text_query: Query<&mut Text>,
|
|
) {
|
|
for (interaction, mut color, children) in &mut interaction_query {
|
|
let mut text = text_query.get_mut(children[0]).unwrap();
|
|
match *interaction {
|
|
Interaction::Clicked => {
|
|
text.sections[0].value = "Press".to_string();
|
|
*color = PRESSED_BUTTON.into();
|
|
}
|
|
Interaction::Hovered => {
|
|
text.sections[0].value = "Hover".to_string();
|
|
*color = HOVERED_BUTTON.into();
|
|
}
|
|
Interaction::None => {
|
|
text.sections[0].value = "Button".to_string();
|
|
*color = NORMAL_BUTTON.into();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
// ui camera
|
|
commands.spawn(Camera2dBundle::default());
|
|
commands
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
size: Size::width(Val::Percent(100.0)),
|
|
align_items: AlignItems::Center,
|
|
justify_content: JustifyContent::Center,
|
|
..default()
|
|
},
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(ButtonBundle {
|
|
style: Style {
|
|
size: Size::new(Val::Px(150.0), Val::Px(65.0)),
|
|
// horizontally center child text
|
|
justify_content: JustifyContent::Center,
|
|
// vertically center child text
|
|
align_items: AlignItems::Center,
|
|
..default()
|
|
},
|
|
background_color: NORMAL_BUTTON.into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn(TextBundle::from_section(
|
|
"Button",
|
|
TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 40.0,
|
|
color: Color::rgb(0.9, 0.9, 0.9),
|
|
},
|
|
));
|
|
});
|
|
});
|
|
}
|