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Add overflow_debug example (#8198)
# Objective - Add a new example that helps debug different UI overflow scenarios - This example tests the clipping behavior for images and text when the node is moved, scaled or rotated. ## Solution - Add a new `overflow_debug` example # Preview **Note:** Only top-left is working properly right now. https://user-images.githubusercontent.com/188612/227629093-26c94c67-1781-437d-8410-e854b6f1adc1.mp4 --- Related #8095, #8167 --------- Co-authored-by: Carter Anderson <mcanders1@gmail.com> Co-authored-by: ickshonpe <david.curthoys@googlemail.com>
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Asier Illarramendi
GitHub
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10
Cargo.toml
10
Cargo.toml
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@ -1745,6 +1745,16 @@ description = "Illustrates how FontAtlases are populated (used to optimize text
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category = "UI (User Interface)"
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wasm = true
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[[example]]
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name = "overflow_debug"
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path = "examples/ui/overflow_debug.rs"
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[package.metadata.example.overflow_debug]
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name = "Overflow and Clipping Debug"
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description = "An example to debug overflow and clipping behavior"
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category = "UI (User Interface)"
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wasm = true
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[[example]]
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name = "relative_cursor_position"
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path = "examples/ui/relative_cursor_position.rs"
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@ -331,6 +331,7 @@ Example | Description
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[Button](../examples/ui/button.rs) | Illustrates creating and updating a button
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[Flex Layout](../examples/ui/flex_layout.rs) | Demonstrates how the AlignItems and JustifyContent properties can be composed to layout nodes and position text
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[Font Atlas Debug](../examples/ui/font_atlas_debug.rs) | Illustrates how FontAtlases are populated (used to optimize text rendering internally)
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[Overflow and Clipping Debug](../examples/ui/overflow_debug.rs) | An example to debug overflow and clipping behavior
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[Relative Cursor Position](../examples/ui/relative_cursor_position.rs) | Showcases the RelativeCursorPosition component
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[Text](../examples/ui/text.rs) | Illustrates creating and updating text
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[Text Debug](../examples/ui/text_debug.rs) | An example for debugging text layout
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303
examples/ui/overflow_debug.rs
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303
examples/ui/overflow_debug.rs
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@ -0,0 +1,303 @@
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//! Tests how different transforms behave when clipped with `Overflow::Hidden`
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use bevy::prelude::*;
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use std::f32::consts::{FRAC_PI_2, PI, TAU};
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const CONTAINER_SIZE: f32 = 150.0;
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const HALF_CONTAINER_SIZE: f32 = CONTAINER_SIZE / 2.0;
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const LOOP_LENGTH: f32 = 4.0;
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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// TODO: Remove once #8144 is fixed
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.insert_resource(GizmoConfig {
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enabled: false,
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..default()
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})
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.insert_resource(AnimationState {
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playing: false,
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paused_at: 0.0,
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paused_total: 0.0,
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t: 0.0,
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})
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.add_systems(Startup, setup)
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.add_systems(
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Update,
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(
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toggle_overflow,
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next_container_size,
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update_transform::<Move>,
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update_transform::<Scale>,
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update_transform::<Rotate>,
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update_animation,
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),
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)
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.run();
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}
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#[derive(Resource)]
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struct AnimationState {
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playing: bool,
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paused_at: f32,
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paused_total: f32,
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t: f32,
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}
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#[derive(Component)]
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struct Container(u8);
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trait UpdateTransform {
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fn update(&self, t: f32, transform: &mut Transform);
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}
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#[derive(Component)]
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struct Move;
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impl UpdateTransform for Move {
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fn update(&self, t: f32, transform: &mut Transform) {
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transform.translation.x = (t * TAU - FRAC_PI_2).sin() * HALF_CONTAINER_SIZE;
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transform.translation.y = -(t * TAU - FRAC_PI_2).cos() * HALF_CONTAINER_SIZE;
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}
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}
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#[derive(Component)]
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struct Scale;
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impl UpdateTransform for Scale {
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fn update(&self, t: f32, transform: &mut Transform) {
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transform.scale.x = 1.0 + 0.5 * (t * TAU).cos().max(0.0);
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transform.scale.y = 1.0 + 0.5 * (t * TAU + PI).cos().max(0.0);
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}
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}
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#[derive(Component)]
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struct Rotate;
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impl UpdateTransform for Rotate {
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fn update(&self, t: f32, transform: &mut Transform) {
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transform.rotation = Quat::from_axis_angle(Vec3::Z, ((t * TAU).cos() * 45.0).to_radians());
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}
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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// Camera
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commands.spawn(Camera2dBundle::default());
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commands
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.spawn(NodeBundle {
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style: Style {
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size: Size::width(Val::Percent(100.)),
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flex_direction: FlexDirection::Column,
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..default()
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},
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..default()
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})
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.with_children(|parent| {
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parent
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.spawn(NodeBundle {
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style: Style {
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size: Size::height(Val::Px(32.)),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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..default()
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},
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background_color: Color::DARK_GRAY.into(),
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..default()
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})
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.with_children(|parent| {
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parent.spawn(TextBundle::from_section(
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vec![
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"Toggle Overflow (O)",
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"Next Container Size (S)",
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"Toggle Animation (space)",
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]
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.join(" · "),
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TextStyle {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 18.0,
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color: Color::WHITE,
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},
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));
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});
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_grow: 1.,
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flex_direction: FlexDirection::Column,
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..default()
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},
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..default()
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})
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.with_children(|parent| {
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spawn_row(parent, |parent| {
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spawn_image(parent, &asset_server, Move);
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spawn_image(parent, &asset_server, Scale);
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spawn_image(parent, &asset_server, Rotate);
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});
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spawn_row(parent, |parent| {
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spawn_text(parent, &asset_server, Move);
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spawn_text(parent, &asset_server, Scale);
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spawn_text(parent, &asset_server, Rotate);
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});
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});
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});
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}
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fn spawn_row(parent: &mut ChildBuilder, spawn_children: impl FnOnce(&mut ChildBuilder)) {
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parent
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.spawn(NodeBundle {
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style: Style {
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size: Size::width(Val::Percent(50.)),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::SpaceEvenly,
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..default()
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},
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..default()
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})
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.with_children(spawn_children);
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}
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fn spawn_image(
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parent: &mut ChildBuilder,
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asset_server: &Res<AssetServer>,
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update_transform: impl UpdateTransform + Component,
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) {
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spawn_container(parent, update_transform, |parent| {
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parent.spawn(ImageBundle {
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image: UiImage::new(asset_server.load("branding/bevy_logo_dark_big.png")),
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style: Style {
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size: Size::height(Val::Px(100.)),
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position_type: PositionType::Absolute,
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top: Val::Px(-50.),
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left: Val::Px(-200.),
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..default()
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},
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..default()
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});
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});
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}
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fn spawn_text(
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parent: &mut ChildBuilder,
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asset_server: &Res<AssetServer>,
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update_transform: impl UpdateTransform + Component,
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) {
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spawn_container(parent, update_transform, |parent| {
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parent.spawn(TextBundle::from_section(
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"Bevy",
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TextStyle {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 120.0,
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color: Color::WHITE,
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},
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));
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});
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}
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fn spawn_container(
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parent: &mut ChildBuilder,
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update_transform: impl UpdateTransform + Component,
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spawn_children: impl FnOnce(&mut ChildBuilder),
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) {
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let mut transform = Transform::default();
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update_transform.update(0.0, &mut transform);
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parent
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.spawn((
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NodeBundle {
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style: Style {
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size: Size::new(Val::Px(CONTAINER_SIZE), Val::Px(CONTAINER_SIZE)),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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overflow: Overflow::Hidden,
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..default()
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},
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background_color: Color::DARK_GRAY.into(),
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..default()
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},
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Container(0),
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))
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.with_children(|parent| {
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parent
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.spawn((
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NodeBundle {
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style: Style {
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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top: Val::Px(transform.translation.x),
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left: Val::Px(transform.translation.y),
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..default()
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},
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transform,
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..default()
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},
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update_transform,
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))
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.with_children(spawn_children);
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});
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}
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fn update_animation(
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mut animation: ResMut<AnimationState>,
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time: Res<Time>,
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keys: Res<Input<KeyCode>>,
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) {
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let time = time.elapsed_seconds();
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if keys.just_pressed(KeyCode::Space) {
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animation.playing = !animation.playing;
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if !animation.playing {
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animation.paused_at = time;
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} else {
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animation.paused_total += time - animation.paused_at;
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}
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}
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if animation.playing {
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animation.t = (time - animation.paused_total) % LOOP_LENGTH / LOOP_LENGTH;
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}
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}
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fn update_transform<T: UpdateTransform + Component>(
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animation: Res<AnimationState>,
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mut containers: Query<(&mut Transform, &mut Style, &T)>,
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) {
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for (mut transform, mut style, update_transform) in &mut containers {
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update_transform.update(animation.t, &mut transform);
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style.left = Val::Px(transform.translation.x);
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style.top = Val::Px(transform.translation.y);
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}
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}
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fn toggle_overflow(keys: Res<Input<KeyCode>>, mut containers: Query<&mut Style, With<Container>>) {
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if keys.just_pressed(KeyCode::O) {
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for mut style in &mut containers {
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style.overflow = match style.overflow {
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Overflow::Visible => Overflow::Hidden,
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Overflow::Hidden => Overflow::Visible,
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};
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}
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}
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}
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fn next_container_size(
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keys: Res<Input<KeyCode>>,
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mut containers: Query<(&mut Style, &mut Container)>,
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) {
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if keys.just_pressed(KeyCode::S) {
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for (mut style, mut container) in &mut containers {
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container.0 = (container.0 + 1) % 3;
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style.size = match container.0 {
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1 => Size::new(Val::Px(CONTAINER_SIZE), Val::Px(30.)),
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2 => Size::new(Val::Px(30.), Val::Px(CONTAINER_SIZE)),
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_ => Size::new(Val::Px(CONTAINER_SIZE), Val::Px(CONTAINER_SIZE)),
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};
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}
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}
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}
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