mirror of
https://github.com/bevyengine/bevy
synced 2024-11-22 04:33:37 +00:00
6f7d0e5725
# Objective
Currently text is recomputed unnecessarily on any changes to its color,
which is extremely expensive.
## Solution
Split up `TextStyle` into two separate components `TextFont` and
`TextColor`.
## Testing
I added this system to `many_buttons`:
```rust
fn set_text_colors_changed(mut colors: Query<&mut TextColor>) {
for mut text_color in colors.iter_mut() {
text_color.set_changed();
}
}
```
reports ~4fps on main, ~50fps with this PR.
## Migration Guide
`TextStyle` has been renamed to `TextFont` and its `color` field has
been moved to a separate component named `TextColor` which newtypes
`Color`.
96 lines
3.3 KiB
Rust
96 lines
3.3 KiB
Rust
//! This example illustrates how to create a button that changes color and text based on its
|
|
//! interaction state.
|
|
|
|
use bevy::{color::palettes::basic::*, 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_systems(Startup, setup)
|
|
.add_systems(Update, button_system)
|
|
.run();
|
|
}
|
|
|
|
const NORMAL_BUTTON: Color = Color::srgb(0.15, 0.15, 0.15);
|
|
const HOVERED_BUTTON: Color = Color::srgb(0.25, 0.25, 0.25);
|
|
const PRESSED_BUTTON: Color = Color::srgb(0.35, 0.75, 0.35);
|
|
|
|
fn button_system(
|
|
mut interaction_query: Query<
|
|
(
|
|
&Interaction,
|
|
&mut BackgroundColor,
|
|
&mut BorderColor,
|
|
&Children,
|
|
),
|
|
(Changed<Interaction>, With<Button>),
|
|
>,
|
|
mut text_query: Query<&mut Text>,
|
|
) {
|
|
for (interaction, mut color, mut border_color, children) in &mut interaction_query {
|
|
let mut text = text_query.get_mut(children[0]).unwrap();
|
|
match *interaction {
|
|
Interaction::Pressed => {
|
|
**text = "Press".to_string();
|
|
*color = PRESSED_BUTTON.into();
|
|
border_color.0 = RED.into();
|
|
}
|
|
Interaction::Hovered => {
|
|
**text = "Hover".to_string();
|
|
*color = HOVERED_BUTTON.into();
|
|
border_color.0 = Color::WHITE;
|
|
}
|
|
Interaction::None => {
|
|
**text = "Button".to_string();
|
|
*color = NORMAL_BUTTON.into();
|
|
border_color.0 = Color::BLACK;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
// ui camera
|
|
commands.spawn(Camera2d);
|
|
commands
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
align_items: AlignItems::Center,
|
|
justify_content: JustifyContent::Center,
|
|
..default()
|
|
},
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(ButtonBundle {
|
|
style: Style {
|
|
width: Val::Px(150.0),
|
|
height: Val::Px(65.0),
|
|
border: UiRect::all(Val::Px(5.0)),
|
|
// horizontally center child text
|
|
justify_content: JustifyContent::Center,
|
|
// vertically center child text
|
|
align_items: AlignItems::Center,
|
|
..default()
|
|
},
|
|
border_color: BorderColor(Color::BLACK),
|
|
border_radius: BorderRadius::MAX,
|
|
background_color: NORMAL_BUTTON.into(),
|
|
..default()
|
|
})
|
|
.with_child((
|
|
Text::new("Button"),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 33.0,
|
|
..default()
|
|
},
|
|
TextColor(Color::srgb(0.9, 0.9, 0.9)),
|
|
));
|
|
});
|
|
}
|