1ba7429371
# Objective Provide a starting point for #3951, or a partial solution. Providing a few comment blocks to discuss, and hopefully find better one in the process. ## Solution Since I am pretty new to pretty much anything in this context, I figured I'd just start with a draft for some file level doc blocks. For some of them I found more relevant details (or at least things I considered interessting), for some others there is less. ## Changelog - Moved some existing comments from main() functions in the 2d examples to the file header level - Wrote some more comment blocks for most other 2d examples TODO: - [x] 2d/sprite_sheet, wasnt able to come up with something good yet - [x] all other example groups... Also: Please let me know if the commit style is okay, or to verbose. I could certainly squash these things, or add more details if needed. I also hope its okay to raise this PR this early, with just a few files changed. Took me long enough and I dont wanted to let it go to waste because I lost motivation to do the whole thing. Additionally I am somewhat uncertain over the style and contents of the commets. So let me know what you thing please.
79 lines
2.6 KiB
Rust
79 lines
2.6 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 UiColor, &Children),
|
|
(Changed<Interaction>, With<Button>),
|
|
>,
|
|
mut text_query: Query<&mut Text>,
|
|
) {
|
|
for (interaction, mut color, children) in interaction_query.iter_mut() {
|
|
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_bundle(UiCameraBundle::default());
|
|
commands
|
|
.spawn_bundle(ButtonBundle {
|
|
style: Style {
|
|
size: Size::new(Val::Px(150.0), Val::Px(65.0)),
|
|
// center button
|
|
margin: UiRect::all(Val::Auto),
|
|
// horizontally center child text
|
|
justify_content: JustifyContent::Center,
|
|
// vertically center child text
|
|
align_items: AlignItems::Center,
|
|
..default()
|
|
},
|
|
color: NORMAL_BUTTON.into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn_bundle(TextBundle {
|
|
text: Text::with_section(
|
|
"Button",
|
|
TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 40.0,
|
|
color: Color::rgb(0.9, 0.9, 0.9),
|
|
},
|
|
Default::default(),
|
|
),
|
|
..default()
|
|
});
|
|
});
|
|
}
|