bevy/examples/ui/display_and_visibility.rs
Nico Burns 96b9d0a7e2
Upgrade to Taffy 0.4 (#10690)
# Objective

- Enables support for `Display::Block`
- Enables support for `Overflow::Hidden`
- Allows for cleaner integration with text, image and other content
layout.
- Unblocks https://github.com/bevyengine/bevy/pull/8104
- Unlocks the possibility of Bevy creating a custom layout tree over
which Taffy operates.
- Enables #8808 / #10193 to remove a Mutex around the font system.

## Todo

- [x] ~Fix rendering of text/images to account for padding/border on
nodes (should size/position to content box rather than border box)~ In
order get this into a mergeable state this PR instead zeroes out
padding/border when syncing leaf node styles into Taffy to preserve the
existing behaviour. https://github.com/bevyengine/bevy/issues/6879 can
be fixed in a followup PR.

## Solution

- Update the version of Taffy
- Update code to work with the new version

Note: Taffy 0.4 has not yet been released. This PR is being created in
advance of the release to ensure that there are no blockers to upgrading
once the release occurs.

---

## Changelog

- Bevy now supports the `Display::Block` and `Overflow::Hidden` styles.
2024-04-30 14:13:17 +00:00

495 lines
21 KiB
Rust

//! Demonstrates how Display and Visibility work in the UI.
use bevy::winit::WinitSettings;
use bevy::{
color::palettes::css::{DARK_GRAY, YELLOW},
prelude::*,
};
const PALETTE: [&str; 4] = ["27496D", "466B7A", "669DB3", "ADCBE3"];
const HIDDEN_COLOR: Color = Color::srgb(1.0, 0.7, 0.7);
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,
(
buttons_handler::<Display>,
buttons_handler::<Visibility>,
text_hover,
),
)
.run();
}
#[derive(Component)]
struct Target<T> {
id: Entity,
phantom: std::marker::PhantomData<T>,
}
impl<T> Target<T> {
fn new(id: Entity) -> Self {
Self {
id,
phantom: std::marker::PhantomData,
}
}
}
trait TargetUpdate {
type TargetComponent: Component;
const NAME: &'static str;
fn update_target(&self, target: &mut Self::TargetComponent) -> String;
}
impl TargetUpdate for Target<Display> {
type TargetComponent = Style;
const NAME: &'static str = "Display";
fn update_target(&self, style: &mut Self::TargetComponent) -> String {
style.display = match style.display {
Display::Flex => Display::None,
Display::None => Display::Flex,
Display::Block | Display::Grid => unreachable!(),
};
format!("{}::{:?} ", Self::NAME, style.display)
}
}
impl TargetUpdate for Target<Visibility> {
type TargetComponent = Visibility;
const NAME: &'static str = "Visibility";
fn update_target(&self, visibility: &mut Self::TargetComponent) -> String {
*visibility = match *visibility {
Visibility::Inherited => Visibility::Visible,
Visibility::Visible => Visibility::Hidden,
Visibility::Hidden => Visibility::Inherited,
};
format!("{}::{visibility:?}", Self::NAME)
}
}
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
let palette: [Color; 4] = PALETTE.map(|hex| Srgba::hex(hex).unwrap().into());
let text_style = TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 24.0,
..default()
};
commands.spawn(Camera2dBundle::default());
commands.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.),
height: Val::Percent(100.),
flex_direction: FlexDirection::Column,
align_items: AlignItems::Center,
justify_content: JustifyContent::SpaceEvenly,
..Default::default()
},
background_color: BackgroundColor(Color::BLACK),
..Default::default()
}).with_children(|parent| {
parent.spawn(TextBundle {
text: Text::from_section(
"Use the panel on the right to change the Display and Visibility properties for the respective nodes of the panel on the left",
text_style.clone(),
).with_justify(JustifyText::Center),
style: Style {
margin: UiRect::bottom(Val::Px(10.)),
..Default::default()
},
..Default::default()
});
parent
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.),
..Default::default()
},
..Default::default()
})
.with_children(|parent| {
let mut target_ids = vec![];
parent.spawn(NodeBundle {
style: Style {
width: Val::Percent(50.),
height: Val::Px(520.),
justify_content: JustifyContent::Center,
..Default::default()
},
..Default::default()
}).with_children(|parent| {
target_ids = spawn_left_panel(parent, &palette);
});
parent.spawn(NodeBundle {
style: Style {
width: Val::Percent(50.),
justify_content: JustifyContent::Center,
..Default::default()
},
..Default::default()
}).with_children(|parent| {
spawn_right_panel(parent, text_style, &palette, target_ids);
});
});
parent.spawn(NodeBundle {
style: Style {
flex_direction: FlexDirection::Row,
align_items: AlignItems::Start,
justify_content: JustifyContent::Start,
column_gap: Val::Px(10.),
..Default::default()
},
..default() })
.with_children(|builder| {
let text_style = TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 20.0,
..default()
};
builder.spawn(TextBundle {
text: Text::from_section(
"Display::None\nVisibility::Hidden\nVisibility::Inherited",
TextStyle { color: HIDDEN_COLOR, ..text_style.clone() }
).with_justify(JustifyText::Center),
..Default::default()
});
builder.spawn(TextBundle {
text: Text::from_section(
"-\n-\n-",
TextStyle { color: DARK_GRAY.into(), ..text_style.clone() }
).with_justify(JustifyText::Center),
..Default::default()
});
builder.spawn(TextBundle::from_section(
"The UI Node and its descendants will not be visible and will not be allotted any space in the UI layout.\nThe UI Node will not be visible but will still occupy space in the UI layout.\nThe UI node will inherit the visibility property of its parent. If it has no parent it will be visible.",
text_style
));
});
});
}
fn spawn_left_panel(builder: &mut ChildBuilder, palette: &[Color; 4]) -> Vec<Entity> {
let mut target_ids = vec![];
builder
.spawn(NodeBundle {
style: Style {
padding: UiRect::all(Val::Px(10.)),
..Default::default()
},
background_color: BackgroundColor(Color::WHITE),
..Default::default()
})
.with_children(|parent| {
parent
.spawn(NodeBundle {
background_color: BackgroundColor(Color::BLACK),
..Default::default()
})
.with_children(|parent| {
let id = parent
.spawn(NodeBundle {
style: Style {
align_items: AlignItems::FlexEnd,
justify_content: JustifyContent::FlexEnd,
..Default::default()
},
background_color: BackgroundColor(palette[0]),
..Default::default()
})
.with_children(|parent| {
parent.spawn(NodeBundle {
style: Style {
width: Val::Px(100.),
height: Val::Px(500.),
..Default::default()
},
..Default::default()
});
let id = parent
.spawn(NodeBundle {
style: Style {
height: Val::Px(400.),
align_items: AlignItems::FlexEnd,
justify_content: JustifyContent::FlexEnd,
..Default::default()
},
background_color: BackgroundColor(palette[1]),
..Default::default()
})
.with_children(|parent| {
parent.spawn(NodeBundle {
style: Style {
width: Val::Px(100.),
height: Val::Px(400.),
..Default::default()
},
..Default::default()
});
let id = parent
.spawn(NodeBundle {
style: Style {
height: Val::Px(300.),
align_items: AlignItems::FlexEnd,
justify_content: JustifyContent::FlexEnd,
..Default::default()
},
background_color: BackgroundColor(palette[2]),
..Default::default()
})
.with_children(|parent| {
parent.spawn(NodeBundle {
style: Style {
width: Val::Px(100.),
height: Val::Px(300.),
..Default::default()
},
..Default::default()
});
let id = parent
.spawn(NodeBundle {
style: Style {
width: Val::Px(200.),
height: Val::Px(200.),
..Default::default()
},
background_color: BackgroundColor(palette[3]),
..Default::default()
})
.id();
target_ids.push(id);
})
.id();
target_ids.push(id);
})
.id();
target_ids.push(id);
})
.id();
target_ids.push(id);
});
});
target_ids
}
fn spawn_right_panel(
parent: &mut ChildBuilder,
text_style: TextStyle,
palette: &[Color; 4],
mut target_ids: Vec<Entity>,
) {
let spawn_buttons = |parent: &mut ChildBuilder, target_id| {
spawn_button::<Display>(parent, text_style.clone(), target_id);
spawn_button::<Visibility>(parent, text_style.clone(), target_id);
};
parent
.spawn(NodeBundle {
style: Style {
padding: UiRect::all(Val::Px(10.)),
..Default::default()
},
background_color: BackgroundColor(Color::WHITE),
..Default::default()
})
.with_children(|parent| {
parent
.spawn(NodeBundle {
style: Style {
width: Val::Px(500.),
height: Val::Px(500.),
flex_direction: FlexDirection::Column,
align_items: AlignItems::FlexEnd,
justify_content: JustifyContent::SpaceBetween,
padding: UiRect {
left: Val::Px(5.),
top: Val::Px(5.),
..Default::default()
},
..Default::default()
},
background_color: BackgroundColor(palette[0]),
..Default::default()
})
.with_children(|parent| {
spawn_buttons(parent, target_ids.pop().unwrap());
parent
.spawn(NodeBundle {
style: Style {
width: Val::Px(400.),
height: Val::Px(400.),
flex_direction: FlexDirection::Column,
align_items: AlignItems::FlexEnd,
justify_content: JustifyContent::SpaceBetween,
padding: UiRect {
left: Val::Px(5.),
top: Val::Px(5.),
..Default::default()
},
..Default::default()
},
background_color: BackgroundColor(palette[1]),
..Default::default()
})
.with_children(|parent| {
spawn_buttons(parent, target_ids.pop().unwrap());
parent
.spawn(NodeBundle {
style: Style {
width: Val::Px(300.),
height: Val::Px(300.),
flex_direction: FlexDirection::Column,
align_items: AlignItems::FlexEnd,
justify_content: JustifyContent::SpaceBetween,
padding: UiRect {
left: Val::Px(5.),
top: Val::Px(5.),
..Default::default()
},
..Default::default()
},
background_color: BackgroundColor(palette[2]),
..Default::default()
})
.with_children(|parent| {
spawn_buttons(parent, target_ids.pop().unwrap());
parent
.spawn(NodeBundle {
style: Style {
width: Val::Px(200.),
height: Val::Px(200.),
align_items: AlignItems::FlexStart,
justify_content: JustifyContent::SpaceBetween,
flex_direction: FlexDirection::Column,
padding: UiRect {
left: Val::Px(5.),
top: Val::Px(5.),
..Default::default()
},
..Default::default()
},
background_color: BackgroundColor(palette[3]),
..Default::default()
})
.with_children(|parent| {
spawn_buttons(parent, target_ids.pop().unwrap());
parent.spawn(NodeBundle {
style: Style {
width: Val::Px(100.),
height: Val::Px(100.),
..Default::default()
},
..Default::default()
});
});
});
});
});
});
}
fn spawn_button<T>(parent: &mut ChildBuilder, text_style: TextStyle, target: Entity)
where
T: Default + std::fmt::Debug + Send + Sync + 'static,
Target<T>: TargetUpdate,
{
parent
.spawn((
ButtonBundle {
style: Style {
align_self: AlignSelf::FlexStart,
padding: UiRect::axes(Val::Px(5.), Val::Px(1.)),
..Default::default()
},
image: UiImage::default().with_color(Color::BLACK.with_alpha(0.5)),
..Default::default()
},
Target::<T>::new(target),
))
.with_children(|builder| {
builder.spawn(
TextBundle::from_section(
format!("{}::{:?}", Target::<T>::NAME, T::default()),
text_style,
)
.with_text_justify(JustifyText::Center),
);
});
}
fn buttons_handler<T>(
mut left_panel_query: Query<&mut <Target<T> as TargetUpdate>::TargetComponent>,
mut visibility_button_query: Query<(&Target<T>, &Interaction, &Children), Changed<Interaction>>,
mut text_query: Query<&mut Text>,
) where
T: Send + Sync,
Target<T>: TargetUpdate + Component,
{
for (target, interaction, children) in visibility_button_query.iter_mut() {
if matches!(interaction, Interaction::Pressed) {
let mut target_value = left_panel_query.get_mut(target.id).unwrap();
for &child in children {
if let Ok(mut text) = text_query.get_mut(child) {
text.sections[0].value = target.update_target(target_value.as_mut());
text.sections[0].style.color = if text.sections[0].value.contains("None")
|| text.sections[0].value.contains("Hidden")
{
Color::srgb(1.0, 0.7, 0.7)
} else {
Color::WHITE
};
}
}
}
}
}
fn text_hover(
mut button_query: Query<(&Interaction, &mut UiImage, &Children), Changed<Interaction>>,
mut text_query: Query<&mut Text>,
) {
for (interaction, mut image, children) in button_query.iter_mut() {
match interaction {
Interaction::Hovered => {
image.color = Color::BLACK.with_alpha(0.6);
for &child in children {
if let Ok(mut text) = text_query.get_mut(child) {
// Bypass change detection to avoid recomputation of the text when only changing the color
text.bypass_change_detection().sections[0].style.color = YELLOW.into();
}
}
}
_ => {
image.color = Color::BLACK.with_alpha(0.5);
for &child in children {
if let Ok(mut text) = text_query.get_mut(child) {
text.bypass_change_detection().sections[0].style.color =
if text.sections[0].value.contains("None")
|| text.sections[0].value.contains("Hidden")
{
HIDDEN_COLOR
} else {
Color::WHITE
};
}
}
}
}
}
}