Implement Feathers toasts

crates/bevy_feathers/Cargo.toml

@@ -35,6 +35,7 @@ bevy_ui_render = { path = "../bevy_ui_render", version = "0.19.0-dev" }
 bevy_window = { path = "../bevy_window", version = "0.19.0-dev" }
 bevy_derive = { path = "../bevy_derive", version = "0.19.0-dev" }
 smol_str = { version = "0.2", default-features = false }
+bevy_time = { path = "../bevy_time", version = "0.19.0-dev" }
 
 # other
 accesskit = "0.24"

crates/bevy_feathers/src/feedback/mod.rs

@@ -0,0 +1,15 @@
+//! Widgets that provide feedback to the user, such as toasts and modals.
+
+mod toast;
+
+use bevy_app::Plugin;
+pub use toast::*;
+
+/// Plugin which registers all `bevy_feathers` feedback widgets.
+pub struct FeedbackPlugin;
+
+impl Plugin for FeedbackPlugin {
+    fn build(&self, app: &mut bevy_app::App) {
+        app.add_plugins((ToastsPlugin,));
+    }
+}

crates/bevy_feathers/src/feedback/toast.rs

@@ -0,0 +1,313 @@
+use core::time::Duration;
+
+use bevy_app::{Plugin, PreUpdate};
+use bevy_asset::AssetServer;
+use bevy_ecs::{
+    component::Component,
+    entity::Entity,
+    hierarchy::{ChildOf, Children},
+    lifecycle::HookContext,
+    observer::On,
+    reflect::{ReflectComponent, ReflectResource},
+    resource::Resource,
+    system::{Commands, Query, Res},
+    template::{template, FromTemplate, ScopedEntityIndex},
+    world::DeferredWorld,
+};
+use bevy_picking::Pickable;
+use bevy_platform::collections::HashMap;
+use bevy_reflect::{prelude::ReflectDefault, Reflect};
+use bevy_scene::{prelude::*, template_value};
+use bevy_text::{FontWeight, LineBreak, TextColor, TextLayout};
+use bevy_time::{Fixed, Time, Timer, TimerMode};
+use bevy_ui::{
+    percent, px,
+    widget::{ImageNode, Text},
+    AlignItems, BackgroundColor, FlexDirection, JustifyContent, Node, Overflow, PositionType,
+    UiRect,
+};
+use bevy_ui_widgets::{Activate, Button};
+
+use crate::{
+    constants::{fonts, icons, size},
+    font_styles::InheritableFont,
+    palette,
+    rounded_corners::RoundedCorners,
+    theme::ThemedText,
+};
+
+const TOAST_HEIGHT_PX: f32 = 60.0;
+const TOAST_MARGIN_PX: f32 = 10.0;
+
+/// Keeps track of currently spawned toasts in their respective positions.
+///
+/// This is used to determine
+/// - initial positioning for each toast relative to other toasts in the same position and
+/// - which toasts need to be repositioned when a toast is despawned
+#[derive(Resource, Default, Reflect)]
+#[reflect(Resource, Default)]
+pub struct ToastPositions(pub HashMap<ToastPosition, Vec<Entity>>);
+
+/// Severity variants for toasts. This determines the background and text color of the toast.
+#[derive(Component, Default, Clone, Copy, Reflect, Debug, PartialEq, Eq)]
+#[reflect(Component, Clone, Default)]
+pub enum ToastVariant {
+    /// Uses [`palette::INFO`] for background and [`palette::WHITE`] for text color.
+    #[default]
+    Info,
+    /// Uses [`palette::SUCCESS`] for background and [`palette::WHITE`] for text color.
+    Success,
+    /// Uses [`palette::WARNING`] for background and [`palette::WHITE`] for text color.
+    Warning,
+    /// Uses [`palette::ERROR`] for background and [`palette::WHITE`] for text color.
+    Error,
+}
+
+/// Available positions for toasts.
+#[derive(Component, Clone, Default, Reflect, Debug, PartialEq, Eq, Hash)]
+#[reflect(Component, Clone, Default)]
+#[component(on_add, on_despawn)]
+pub enum ToastPosition {
+    /// Bottom right corner of the screen. Siblings stack upwards.
+    #[default]
+    BottomRight,
+    /// Bottom left corner of the screen. Siblings stack upwards.
+    BottomLeft,
+    /// Top left corner of the screen. Siblings stack downwards.
+    TopLeft,
+    /// Top right corner of the screen. Siblings stack downwards.
+    TopRight,
+}
+
+impl ToastPosition {
+    fn on_add(mut world: DeferredWorld, HookContext { entity, .. }: HookContext) {
+        let position = world
+            .entity(entity)
+            .get::<ToastPosition>()
+            .expect("ToastPosition should be present in ToastPosition on_add")
+            .clone();
+        let mut toast_positions = world.resource_mut::<ToastPositions>();
+        let idx = toast_positions.0.get(&position).unwrap_or(&vec![]).len();
+        toast_positions
+            .0
+            .entry(position.clone())
+            .or_default()
+            .push(entity);
+        let mut entity_mut = world.entity_mut(entity);
+        let mut node = entity_mut
+            .get_mut::<Node>()
+            .expect("Node should be present in ToastPosition on_add");
+        let offset = (TOAST_HEIGHT_PX + TOAST_MARGIN_PX) * idx as f32;
+        match position {
+            ToastPosition::BottomRight => {
+                node.bottom = px(offset);
+                node.right = px(TOAST_MARGIN_PX);
+            }
+            ToastPosition::BottomLeft => {
+                node.bottom = px(offset);
+                node.left = px(TOAST_MARGIN_PX);
+            }
+            ToastPosition::TopLeft => {
+                node.top = px(offset);
+                node.left = px(TOAST_MARGIN_PX);
+            }
+            ToastPosition::TopRight => {
+                node.top = px(offset);
+                node.right = px(TOAST_MARGIN_PX);
+            }
+        }
+    }
+
+    fn on_despawn(mut world: DeferredWorld, HookContext { entity, .. }: HookContext) {
+        let position = world
+            .entity(entity)
+            .get::<ToastPosition>()
+            .expect("ToastPosition component should be present on entity when on_despawn is called")
+            .clone();
+        let mut toast_positions = world.resource_mut::<ToastPositions>();
+        let removed_idx = toast_positions
+            .0
+            .get(&position)
+            .unwrap()
+            .iter()
+            .position(|e| *e == entity)
+            .unwrap();
+        if let Some(entities) = toast_positions.0.get_mut(&position) {
+            entities.retain(|&e| e != entity);
+        }
+        let dirty_nodes = toast_positions
+            .0
+            .get(&position)
+            .unwrap()
+            .iter()
+            .skip(removed_idx)
+            .cloned()
+            .collect::<Vec<_>>();
+        for (idx, entity) in dirty_nodes.iter().enumerate() {
+            let mut entity_mut = world.entity_mut(*entity);
+            let mut node = entity_mut
+                .get_mut::<Node>()
+                .expect("Node should be present in ToastPosition on_despawn");
+            let offset = (TOAST_HEIGHT_PX + TOAST_MARGIN_PX) * (removed_idx + idx) as f32;
+            match position {
+                ToastPosition::BottomRight | ToastPosition::BottomLeft => {
+                    node.bottom = px(offset);
+                }
+                ToastPosition::TopLeft | ToastPosition::TopRight => {
+                    node.top = px(offset);
+                }
+            }
+        }
+    }
+}
+
+/// Component for keeping track of the progress bar of a toast with a duration.
+/// This is used to update the width of the progress bar and despawn the toast when the timer finishes.
+#[derive(Component, FromTemplate, Clone, Reflect, Debug, PartialEq, Eq)]
+#[reflect(Component, Clone)]
+pub struct ToastProgressBar {
+    /// [Timer] for the toast duration. The progress bar width is updated based on the remaining time of this timer, and the toast is despawned when this timer finishes.
+    pub timer: Timer,
+    /// The root entity of the toast. This is used to despawn the toast when the timer finishes.
+    pub root_entity: Entity,
+}
+
+/// A toast widget.
+///
+/// This is spawnable by inheriting it as a "scene component" with optional [`FeathersToastProps`].
+#[derive(SceneComponent, Default, Clone)]
+#[scene(FeathersToastProps)]
+pub struct FeathersToast;
+
+/// Props used for construct a [`FeathersToast`] scene.
+pub struct FeathersToastProps {
+    /// The message to display in the toast.
+    pub message: String,
+    /// The severity variant of the toast, which determines the background and text color.
+    pub variant: ToastVariant,
+    /// Optional duration for the toast. If `Some`, a progress bar is shown and the toast is automatically despawned after the duration. If `None`, the toast will stay until manually despawned.
+    pub duration: Option<Duration>,
+    /// The position of the toast on the screen, which determines where the toast is spawned and how it is stacked with other toasts.
+    pub position: ToastPosition,
+}
+
+impl Default for FeathersToastProps {
+    fn default() -> Self {
+        Self {
+            message: "".to_string(), // TODO: Could multiline messages be supported by passing a [`SceneList`]?
+            variant: ToastVariant::default(),
+            duration: Some(Duration::from_secs(3)),
+            position: ToastPosition::default(),
+        }
+    }
+}
+
+impl FeathersToast {
+    fn scene(props: FeathersToastProps) -> impl Scene {
+        bsn! {
+            #Toast
+            Node {
+                width: px(300),
+                height: px(60),
+                margin: UiRect::all(px(5)),
+                padding: UiRect::all(px(10)),
+                border_radius: {RoundedCorners::All.to_border_radius(4.0)},
+                align_items: AlignItems::Center,
+                justify_content: JustifyContent::SpaceBetween,
+                flex_direction: FlexDirection::Row,
+                position_type: PositionType::Absolute
+            }
+            Pickable::IGNORE
+            template_value(props.variant)
+            template_value(props.position)
+            template(move |_| {
+                let background_color = match props.variant {
+                    ToastVariant::Info => palette::INFO,
+                    ToastVariant::Success => palette::SUCCESS,
+                    ToastVariant::Warning => palette::WARNING,
+                    ToastVariant::Error => palette::ERROR,
+                };
+                Ok(BackgroundColor(background_color))
+            })
+            Children[(
+                Node {
+                    width: percent(90),
+                    overflow: Overflow::clip_x()
+                }
+                InheritableFont {
+                    font: fonts::REGULAR,
+                    font_size: size::COMPACT_FONT,
+                    weight: FontWeight::NORMAL,
+                }
+                Children[(
+                    Text({props.message})
+                    ThemedText
+                    TextLayout {linebreak: LineBreak::NoWrap}
+                    TextColor(palette::WHITE)
+                )]
+            ), (
+                Node {
+                    width: px(30),
+                    height: px(30),
+                }
+                Button
+                template(|ctx| {
+                    let handle = ctx.resource::<AssetServer>().load(icons::X);
+                    Ok(ImageNode::new(handle))
+                })
+                on(|trigger: On<Activate>, mut commands: Commands, child_of: Query<&ChildOf>| {
+                    if let Ok(parent) = child_of.get(trigger.entity) {
+                        commands.entity(parent.0).despawn();
+                    }
+                })
+            ), ({ if let Some(duration) = props.duration {
+                    Box::new(bsn! {
+                        Node {
+                            width: percent(100),
+                            height: px(10),
+                            position_type: PositionType::Absolute,
+                            bottom: px(0),
+                            left: px(0),
+                        }
+                        BackgroundColor(palette::WHITE)
+                        template(move |ctx| {
+                            let root_entity = ctx.get_scoped_entity(ScopedEntityIndex { scope: 1, index: 0}); // TODO: Why is the scope 1 here? Before #24008 this was in 0.
+                            Ok(ToastProgressBar { timer: Timer::new(duration, TimerMode::Once), root_entity })
+                        })
+                        // ToastProgressBar { timer: Timer::new(props.duration.unwrap(), TimerMode::Once), root_entity: #Toast } // TODO: This panics if the EntityReference is there
+                        }) as Box<dyn Scene>
+                } else {
+                    Box::new(bsn!()) as Box<dyn Scene>
+                }
+            })]
+        }
+    }
+}
+
+fn tick_toasts_progress_bars(
+    mut commands: Commands,
+    mut toast_progress_bars: Query<(&mut Node, &mut ToastProgressBar)>,
+    time: Res<Time<Fixed>>,
+) {
+    for (mut node, mut toast_progress_bar) in &mut toast_progress_bars {
+        let timer = &mut toast_progress_bar.timer;
+        timer.tick(time.delta());
+        let remaining_secs = timer.remaining_secs();
+        let duration_secs = timer.duration().as_secs() as f32;
+        let remaining = remaining_secs / duration_secs;
+        node.width = percent(remaining * 100.);
+        if timer.is_finished() {
+            commands.entity(toast_progress_bar.root_entity).despawn();
+        }
+    }
+}
+
+/// Plugin which registers the systems for managing toasts.
+pub struct ToastsPlugin;
+
+impl Plugin for ToastsPlugin {
+    fn build(&self, app: &mut bevy_app::App) {
+        app.init_resource::<ToastPositions>();
+        app.add_systems(PreUpdate, tick_toasts_progress_bars);
+    }
+}

crates/bevy_feathers/src/lib.rs

@@ -42,6 +42,7 @@ use crate::{
     alpha_pattern::{AlphaPatternMaterial, AlphaPatternResource},
     controls::ControlsPlugin,
     cursor::{CursorIconPlugin, DefaultCursor, EntityCursor},
+    feedback::FeedbackPlugin,
     theme::{ThemedText, UiTheme},
 };
 
@@ -52,6 +53,7 @@ pub mod controls;
 pub mod cursor;
 pub mod dark_theme;
 pub mod display;
+pub mod feedback;
 pub mod focus;
 pub mod font_styles;
 pub mod palette;
@@ -85,6 +87,7 @@ impl Plugin for FeathersCorePlugin {
         app.add_plugins((
             ControlsPlugin,
             CursorIconPlugin,
+            FeedbackPlugin,
             HierarchyPropagatePlugin::<TextColor, With<ThemedText>>::new(PostUpdate),
             HierarchyPropagatePlugin::<TextFont, With<ThemedText>>::new(PostUpdate),
             UiMaterialPlugin::<AlphaPatternMaterial>::default(),

crates/bevy_feathers/src/palette.rs

@@ -29,3 +29,11 @@ pub const X_AXIS: Color = Color::oklcha(0.5232, 0.1404, 13.84, 1.0);
 pub const Y_AXIS: Color = Color::oklcha(0.5866, 0.1543, 129.84, 1.0);
 /// <div style="background-color: #2160A3; width: 10px; padding: 10px; border: 1px solid;"></div> - for Z-axis inputs and drag handles
 pub const Z_AXIS: Color = Color::oklcha(0.4847, 0.1249, 253.08, 1.0);
+/// <div style="background-color: #206EC9; width: 10px; padding: 10px; border: 1px solid;"></div> - for info messages and indicators
+pub const INFO: Color = Color::oklcha(0.26, 0.04, 250.0, 1.0);
+/// <div style="background-color: #2FA843; width: 10px; padding: 10px; border: 1px solid;"></div> - for success messages and indicators
+pub const SUCCESS: Color = Color::oklcha(0.27, 0.04, 140.0, 1.0);
+/// <div style="background-color: #E5B000; width: 10px; padding: 10px; border: 1px solid;"></div> - for warnings and cautionary indicators
+pub const WARNING: Color = Color::oklcha(0.28, 0.05, 75.0, 1.0);
+/// <div style="background-color: #AB4051; width: 10px; padding: 10px; border: 1px solid;"></div> - for error messages and indicators
+pub const ERROR: Color = Color::oklcha(0.27, 0.05, 10.0, 1.0);