756 lines
24 KiB
Rust
756 lines
24 KiB
Rust
//! This example illustrates how to create widgets using the `bevy_core_widgets` widget set.
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use bevy::{
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color::palettes::basic::*,
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core_widgets::{
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CoreButton, CoreCheckbox, CoreRadio, CoreRadioGroup, CoreSlider, CoreSliderThumb,
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CoreWidgetsPlugin, SliderRange, SliderValue, TrackClick,
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},
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ecs::system::SystemId,
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input_focus::{
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tab_navigation::{TabGroup, TabIndex, TabNavigationPlugin},
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InputDispatchPlugin,
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},
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picking::hover::Hovered,
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prelude::*,
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ui::{Checked, InteractionDisabled, Pressed},
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winit::WinitSettings,
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};
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fn main() {
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App::new()
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.add_plugins((
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DefaultPlugins,
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CoreWidgetsPlugin,
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InputDispatchPlugin,
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TabNavigationPlugin,
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))
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// Only run the app when there is user input. This will significantly reduce CPU/GPU use.
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.insert_resource(WinitSettings::desktop_app())
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.insert_resource(DemoWidgetStates {
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slider_value: 50.0,
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slider_click: TrackClick::Snap,
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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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update_widget_values,
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update_button_style,
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update_button_style2,
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update_slider_style.after(update_widget_values),
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update_slider_style2.after(update_widget_values),
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update_checkbox_or_radio_style.after(update_widget_values),
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update_checkbox_or_radio_style2.after(update_widget_values),
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toggle_disabled,
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),
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)
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.run();
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}
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const NORMAL_BUTTON: Color = Color::srgb(0.15, 0.15, 0.15);
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const HOVERED_BUTTON: Color = Color::srgb(0.25, 0.25, 0.25);
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const PRESSED_BUTTON: Color = Color::srgb(0.35, 0.75, 0.35);
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const SLIDER_TRACK: Color = Color::srgb(0.05, 0.05, 0.05);
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const SLIDER_THUMB: Color = Color::srgb(0.35, 0.75, 0.35);
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const CHECKBOX_OUTLINE: Color = Color::srgb(0.45, 0.45, 0.45);
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const CHECKBOX_CHECK: Color = Color::srgb(0.35, 0.75, 0.35);
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/// Marker which identifies buttons with a particular style, in this case the "Demo style".
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#[derive(Component)]
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struct DemoButton;
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/// Marker which identifies sliders with a particular style.
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#[derive(Component, Default)]
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struct DemoSlider;
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/// Marker which identifies the slider's thumb element.
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#[derive(Component, Default)]
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struct DemoSliderThumb;
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/// Marker which identifies checkboxes with a particular style.
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#[derive(Component, Default)]
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struct DemoCheckbox;
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/// Marker which identifies a styled radio button. We'll use this to change the track click
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/// behavior.
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#[derive(Component, Default)]
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struct DemoRadio(TrackClick);
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/// A struct to hold the state of various widgets shown in the demo.
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///
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/// While it is possible to use the widget's own state components as the source of truth,
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/// in many cases widgets will be used to display dynamic data coming from deeper within the app,
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/// using some kind of data-binding. This example shows how to maintain an external source of
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/// truth for widget states.
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#[derive(Resource)]
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struct DemoWidgetStates {
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slider_value: f32,
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slider_click: TrackClick,
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}
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/// Update the widget states based on the changing resource.
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fn update_widget_values(
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res: Res<DemoWidgetStates>,
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mut sliders: Query<(Entity, &mut CoreSlider), With<DemoSlider>>,
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radios: Query<(Entity, &DemoRadio, Has<Checked>)>,
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mut commands: Commands,
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) {
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if res.is_changed() {
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for (slider_ent, mut slider) in sliders.iter_mut() {
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commands
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.entity(slider_ent)
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.insert(SliderValue(res.slider_value));
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slider.track_click = res.slider_click;
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}
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for (radio_id, radio_value, checked) in radios.iter() {
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let will_be_checked = radio_value.0 == res.slider_click;
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if will_be_checked != checked {
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if will_be_checked {
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commands.entity(radio_id).insert(Checked);
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} else {
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commands.entity(radio_id).remove::<Checked>();
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}
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}
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}
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}
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}
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fn setup(mut commands: Commands, assets: Res<AssetServer>) {
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// System to print a value when the button is clicked.
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let on_click = commands.register_system(|| {
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info!("Button clicked!");
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});
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// System to update a resource when the slider value changes. Note that we could have
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// updated the slider value directly, but we want to demonstrate externalizing the state.
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let on_change_value = commands.register_system(
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|value: In<f32>, mut widget_states: ResMut<DemoWidgetStates>| {
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widget_states.slider_value = *value;
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},
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);
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// System to update a resource when the radio group changes.
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let on_change_radio = commands.register_system(
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|value: In<Entity>,
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mut widget_states: ResMut<DemoWidgetStates>,
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q_radios: Query<&DemoRadio>| {
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if let Ok(radio) = q_radios.get(*value) {
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widget_states.slider_click = radio.0;
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}
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},
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);
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// ui camera
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commands.spawn(Camera2d);
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commands.spawn(demo_root(
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&assets,
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on_click,
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on_change_value,
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on_change_radio,
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));
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}
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fn demo_root(
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asset_server: &AssetServer,
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on_click: SystemId,
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on_change_value: SystemId<In<f32>>,
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on_change_radio: SystemId<In<Entity>>,
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) -> impl Bundle {
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(
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Node {
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width: Val::Percent(100.0),
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height: Val::Percent(100.0),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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display: Display::Flex,
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flex_direction: FlexDirection::Column,
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row_gap: Val::Px(10.0),
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..default()
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},
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TabGroup::default(),
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children![
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button(asset_server, on_click),
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slider(0.0, 100.0, 50.0, Some(on_change_value)),
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checkbox(asset_server, "Checkbox", None),
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radio_group(asset_server, Some(on_change_radio)),
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Text::new("Press 'D' to toggle widget disabled states"),
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],
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)
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}
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fn button(asset_server: &AssetServer, on_click: SystemId) -> impl Bundle {
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(
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Node {
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width: Val::Px(150.0),
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height: Val::Px(65.0),
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border: UiRect::all(Val::Px(5.0)),
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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..default()
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},
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DemoButton,
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CoreButton {
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on_click: Some(on_click),
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},
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Hovered::default(),
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TabIndex(0),
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BorderColor::all(Color::BLACK),
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BorderRadius::MAX,
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BackgroundColor(NORMAL_BUTTON),
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children![(
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Text::new("Button"),
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TextFont {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 33.0,
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..default()
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},
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TextColor(Color::srgb(0.9, 0.9, 0.9)),
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TextShadow::default(),
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)],
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)
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}
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fn update_button_style(
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mut buttons: Query<
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(
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Has<Pressed>,
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&Hovered,
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Has<InteractionDisabled>,
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&mut BackgroundColor,
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&mut BorderColor,
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&Children,
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),
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(
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Or<(
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Changed<Pressed>,
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Changed<Hovered>,
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Added<InteractionDisabled>,
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)>,
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With<DemoButton>,
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),
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>,
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mut text_query: Query<&mut Text>,
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) {
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for (pressed, hovered, disabled, mut color, mut border_color, children) in &mut buttons {
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let mut text = text_query.get_mut(children[0]).unwrap();
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set_button_style(
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disabled,
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hovered.get(),
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pressed,
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&mut color,
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&mut border_color,
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&mut text,
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);
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}
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}
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/// Supplementary system to detect removed marker components
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fn update_button_style2(
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mut buttons: Query<
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(
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Has<Pressed>,
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&Hovered,
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Has<InteractionDisabled>,
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&mut BackgroundColor,
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&mut BorderColor,
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&Children,
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),
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With<DemoButton>,
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>,
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mut removed_depressed: RemovedComponents<Pressed>,
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mut removed_disabled: RemovedComponents<InteractionDisabled>,
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mut text_query: Query<&mut Text>,
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) {
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removed_depressed
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.read()
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.chain(removed_disabled.read())
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.for_each(|entity| {
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if let Ok((pressed, hovered, disabled, mut color, mut border_color, children)) =
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buttons.get_mut(entity)
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{
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let mut text = text_query.get_mut(children[0]).unwrap();
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set_button_style(
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disabled,
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hovered.get(),
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pressed,
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&mut color,
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&mut border_color,
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&mut text,
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);
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}
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});
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}
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fn set_button_style(
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disabled: bool,
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hovered: bool,
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pressed: bool,
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color: &mut BackgroundColor,
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border_color: &mut BorderColor,
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text: &mut Text,
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) {
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match (disabled, hovered, pressed) {
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// Disabled button
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(true, _, _) => {
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**text = "Disabled".to_string();
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*color = NORMAL_BUTTON.into();
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border_color.set_all(GRAY);
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}
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// Pressed and hovered button
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(false, true, true) => {
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**text = "Press".to_string();
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*color = PRESSED_BUTTON.into();
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border_color.set_all(RED);
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}
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// Hovered, unpressed button
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(false, true, false) => {
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**text = "Hover".to_string();
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*color = HOVERED_BUTTON.into();
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border_color.set_all(WHITE);
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}
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// Unhovered button (either pressed or not).
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(false, false, _) => {
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**text = "Button".to_string();
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*color = NORMAL_BUTTON.into();
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border_color.set_all(BLACK);
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}
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}
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}
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/// Create a demo slider
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fn slider(min: f32, max: f32, value: f32, on_change: Option<SystemId<In<f32>>>) -> impl Bundle {
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(
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Node {
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display: Display::Flex,
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flex_direction: FlexDirection::Column,
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Stretch,
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justify_items: JustifyItems::Center,
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column_gap: Val::Px(4.0),
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height: Val::Px(12.0),
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width: Val::Percent(30.0),
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..default()
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},
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Name::new("Slider"),
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Hovered::default(),
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DemoSlider,
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CoreSlider {
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on_change,
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track_click: TrackClick::Snap,
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},
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SliderValue(value),
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SliderRange::new(min, max),
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TabIndex(0),
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Children::spawn((
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// Slider background rail
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Spawn((
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Node {
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height: Val::Px(6.0),
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..default()
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},
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BackgroundColor(SLIDER_TRACK), // Border color for the checkbox
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BorderRadius::all(Val::Px(3.0)),
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)),
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// Invisible track to allow absolute placement of thumb entity. This is narrower than
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// the actual slider, which allows us to position the thumb entity using simple
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// percentages, without having to measure the actual width of the slider thumb.
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Spawn((
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Node {
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display: Display::Flex,
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position_type: PositionType::Absolute,
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left: Val::Px(0.0),
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// Track is short by 12px to accommodate the thumb.
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right: Val::Px(12.0),
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top: Val::Px(0.0),
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bottom: Val::Px(0.0),
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..default()
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},
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children![(
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// Thumb
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DemoSliderThumb,
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CoreSliderThumb,
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Node {
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display: Display::Flex,
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width: Val::Px(12.0),
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height: Val::Px(12.0),
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position_type: PositionType::Absolute,
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left: Val::Percent(0.0), // This will be updated by the slider's value
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..default()
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},
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BorderRadius::MAX,
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BackgroundColor(SLIDER_THUMB),
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)],
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)),
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)),
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)
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}
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/// Update the visuals of the slider based on the slider state.
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fn update_slider_style(
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sliders: Query<
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(
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Entity,
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&SliderValue,
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&SliderRange,
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&Hovered,
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Has<InteractionDisabled>,
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),
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(
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Or<(
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Changed<SliderValue>,
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Changed<SliderRange>,
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Changed<Hovered>,
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Added<InteractionDisabled>,
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)>,
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With<DemoSlider>,
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),
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>,
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children: Query<&Children>,
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mut thumbs: Query<(&mut Node, &mut BackgroundColor, Has<DemoSliderThumb>), Without<DemoSlider>>,
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) {
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for (slider_ent, value, range, hovered, disabled) in sliders.iter() {
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for child in children.iter_descendants(slider_ent) {
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if let Ok((mut thumb_node, mut thumb_bg, is_thumb)) = thumbs.get_mut(child) {
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if is_thumb {
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thumb_node.left = Val::Percent(range.thumb_position(value.0) * 100.0);
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thumb_bg.0 = thumb_color(disabled, hovered.0);
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}
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}
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}
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}
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}
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fn update_slider_style2(
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sliders: Query<(Entity, &Hovered, Has<InteractionDisabled>), With<DemoSlider>>,
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children: Query<&Children>,
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mut thumbs: Query<(&mut BackgroundColor, Has<DemoSliderThumb>), Without<DemoSlider>>,
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mut removed_disabled: RemovedComponents<InteractionDisabled>,
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) {
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removed_disabled.read().for_each(|entity| {
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if let Ok((slider_ent, hovered, disabled)) = sliders.get(entity) {
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for child in children.iter_descendants(slider_ent) {
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if let Ok((mut thumb_bg, is_thumb)) = thumbs.get_mut(child) {
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if is_thumb {
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thumb_bg.0 = thumb_color(disabled, hovered.0);
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}
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}
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}
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}
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});
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}
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fn thumb_color(disabled: bool, hovered: bool) -> Color {
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match (disabled, hovered) {
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(true, _) => GRAY.into(),
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(false, true) => SLIDER_THUMB.lighter(0.3),
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_ => SLIDER_THUMB,
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}
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}
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/// Create a demo checkbox
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fn checkbox(
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asset_server: &AssetServer,
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caption: &str,
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on_change: Option<SystemId<In<bool>>>,
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) -> impl Bundle {
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(
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Node {
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display: Display::Flex,
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flex_direction: FlexDirection::Row,
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justify_content: JustifyContent::FlexStart,
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align_items: AlignItems::Center,
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align_content: AlignContent::Center,
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column_gap: Val::Px(4.0),
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..default()
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},
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Name::new("Checkbox"),
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Hovered::default(),
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DemoCheckbox,
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CoreCheckbox { on_change },
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TabIndex(0),
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Children::spawn((
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Spawn((
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// Checkbox outer
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Node {
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display: Display::Flex,
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width: Val::Px(16.0),
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height: Val::Px(16.0),
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border: UiRect::all(Val::Px(2.0)),
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..default()
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},
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BorderColor::all(CHECKBOX_OUTLINE), // Border color for the checkbox
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BorderRadius::all(Val::Px(3.0)),
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children![
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// Checkbox inner
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(
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Node {
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display: Display::Flex,
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width: Val::Px(8.0),
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height: Val::Px(8.0),
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position_type: PositionType::Absolute,
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left: Val::Px(2.0),
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top: Val::Px(2.0),
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..default()
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},
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BackgroundColor(CHECKBOX_CHECK),
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),
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],
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)),
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Spawn((
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Text::new(caption),
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TextFont {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 20.0,
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..default()
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},
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)),
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)),
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)
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}
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|
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// Update the checkbox's styles.
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fn update_checkbox_or_radio_style(
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mut q_checkbox: Query<
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(Has<Checked>, &Hovered, Has<InteractionDisabled>, &Children),
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(
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Or<(With<DemoCheckbox>, With<DemoRadio>)>,
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Or<(
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Added<DemoCheckbox>,
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Changed<Hovered>,
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Added<Checked>,
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Added<InteractionDisabled>,
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)>,
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),
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>,
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mut q_border_color: Query<
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(&mut BorderColor, &mut Children),
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(Without<DemoCheckbox>, Without<DemoRadio>),
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>,
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mut q_bg_color: Query<&mut BackgroundColor, (Without<DemoCheckbox>, Without<Children>)>,
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) {
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for (checked, Hovered(is_hovering), is_disabled, children) in q_checkbox.iter_mut() {
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let Some(border_id) = children.first() else {
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continue;
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};
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let Ok((mut border_color, border_children)) = q_border_color.get_mut(*border_id) else {
|
|
continue;
|
|
};
|
|
|
|
let Some(mark_id) = border_children.first() else {
|
|
warn!("Checkbox does not have a mark entity.");
|
|
continue;
|
|
};
|
|
|
|
let Ok(mut mark_bg) = q_bg_color.get_mut(*mark_id) else {
|
|
warn!("Checkbox mark entity lacking a background color.");
|
|
continue;
|
|
};
|
|
|
|
set_checkbox_or_radio_style(
|
|
is_disabled,
|
|
*is_hovering,
|
|
checked,
|
|
&mut border_color,
|
|
&mut mark_bg,
|
|
);
|
|
}
|
|
}
|
|
|
|
fn update_checkbox_or_radio_style2(
|
|
mut q_checkbox: Query<
|
|
(Has<Checked>, &Hovered, Has<InteractionDisabled>, &Children),
|
|
Or<(With<DemoCheckbox>, With<DemoRadio>)>,
|
|
>,
|
|
mut q_border_color: Query<
|
|
(&mut BorderColor, &mut Children),
|
|
(Without<DemoCheckbox>, Without<DemoRadio>),
|
|
>,
|
|
mut q_bg_color: Query<
|
|
&mut BackgroundColor,
|
|
(Without<DemoCheckbox>, Without<DemoRadio>, Without<Children>),
|
|
>,
|
|
mut removed_checked: RemovedComponents<Checked>,
|
|
mut removed_disabled: RemovedComponents<InteractionDisabled>,
|
|
) {
|
|
removed_checked
|
|
.read()
|
|
.chain(removed_disabled.read())
|
|
.for_each(|entity| {
|
|
if let Ok((checked, Hovered(is_hovering), is_disabled, children)) =
|
|
q_checkbox.get_mut(entity)
|
|
{
|
|
let Some(border_id) = children.first() else {
|
|
return;
|
|
};
|
|
|
|
let Ok((mut border_color, border_children)) = q_border_color.get_mut(*border_id)
|
|
else {
|
|
return;
|
|
};
|
|
|
|
let Some(mark_id) = border_children.first() else {
|
|
warn!("Checkbox does not have a mark entity.");
|
|
return;
|
|
};
|
|
|
|
let Ok(mut mark_bg) = q_bg_color.get_mut(*mark_id) else {
|
|
warn!("Checkbox mark entity lacking a background color.");
|
|
return;
|
|
};
|
|
|
|
set_checkbox_or_radio_style(
|
|
is_disabled,
|
|
*is_hovering,
|
|
checked,
|
|
&mut border_color,
|
|
&mut mark_bg,
|
|
);
|
|
}
|
|
});
|
|
}
|
|
|
|
fn set_checkbox_or_radio_style(
|
|
disabled: bool,
|
|
hovering: bool,
|
|
checked: bool,
|
|
border_color: &mut BorderColor,
|
|
mark_bg: &mut BackgroundColor,
|
|
) {
|
|
let color: Color = if disabled {
|
|
// If the checkbox is disabled, use a lighter color
|
|
CHECKBOX_OUTLINE.with_alpha(0.2)
|
|
} else if hovering {
|
|
// If hovering, use a lighter color
|
|
CHECKBOX_OUTLINE.lighter(0.2)
|
|
} else {
|
|
// Default color for the checkbox
|
|
CHECKBOX_OUTLINE
|
|
};
|
|
|
|
// Update the background color of the check mark
|
|
border_color.set_all(color);
|
|
|
|
let mark_color: Color = match (disabled, checked) {
|
|
(true, true) => CHECKBOX_CHECK.with_alpha(0.5),
|
|
(false, true) => CHECKBOX_CHECK,
|
|
(_, false) => Srgba::NONE.into(),
|
|
};
|
|
|
|
if mark_bg.0 != mark_color {
|
|
// Update the color of the check mark
|
|
mark_bg.0 = mark_color;
|
|
}
|
|
}
|
|
|
|
/// Create a demo radio group
|
|
fn radio_group(asset_server: &AssetServer, on_change: Option<SystemId<In<Entity>>>) -> impl Bundle {
|
|
(
|
|
Node {
|
|
display: Display::Flex,
|
|
flex_direction: FlexDirection::Column,
|
|
align_items: AlignItems::Start,
|
|
column_gap: Val::Px(4.0),
|
|
..default()
|
|
},
|
|
Name::new("RadioGroup"),
|
|
CoreRadioGroup { on_change },
|
|
TabIndex::default(),
|
|
children![
|
|
(radio(asset_server, TrackClick::Drag, "Slider Drag"),),
|
|
(radio(asset_server, TrackClick::Step, "Slider Step"),),
|
|
(radio(asset_server, TrackClick::Snap, "Slider Snap"),)
|
|
],
|
|
)
|
|
}
|
|
|
|
/// Create a demo radio button
|
|
fn radio(asset_server: &AssetServer, value: TrackClick, caption: &str) -> impl Bundle {
|
|
(
|
|
Node {
|
|
display: Display::Flex,
|
|
flex_direction: FlexDirection::Row,
|
|
justify_content: JustifyContent::FlexStart,
|
|
align_items: AlignItems::Center,
|
|
align_content: AlignContent::Center,
|
|
column_gap: Val::Px(4.0),
|
|
..default()
|
|
},
|
|
Name::new("RadioButton"),
|
|
Hovered::default(),
|
|
DemoRadio(value),
|
|
CoreRadio,
|
|
Children::spawn((
|
|
Spawn((
|
|
// Radio outer
|
|
Node {
|
|
display: Display::Flex,
|
|
width: Val::Px(16.0),
|
|
height: Val::Px(16.0),
|
|
border: UiRect::all(Val::Px(2.0)),
|
|
..default()
|
|
},
|
|
BorderColor::all(CHECKBOX_OUTLINE), // Border color for the checkbox
|
|
BorderRadius::MAX,
|
|
children![
|
|
// Radio inner
|
|
(
|
|
Node {
|
|
display: Display::Flex,
|
|
width: Val::Px(8.0),
|
|
height: Val::Px(8.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(2.0),
|
|
top: Val::Px(2.0),
|
|
..default()
|
|
},
|
|
BorderRadius::MAX,
|
|
BackgroundColor(CHECKBOX_CHECK),
|
|
),
|
|
],
|
|
)),
|
|
Spawn((
|
|
Text::new(caption),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 20.0,
|
|
..default()
|
|
},
|
|
)),
|
|
)),
|
|
)
|
|
}
|
|
|
|
fn toggle_disabled(
|
|
input: Res<ButtonInput<KeyCode>>,
|
|
mut interaction_query: Query<
|
|
(Entity, Has<InteractionDisabled>),
|
|
Or<(
|
|
With<CoreButton>,
|
|
With<CoreSlider>,
|
|
With<CoreCheckbox>,
|
|
With<CoreRadio>,
|
|
)>,
|
|
>,
|
|
mut commands: Commands,
|
|
) {
|
|
if input.just_pressed(KeyCode::KeyD) {
|
|
for (entity, disabled) in &mut interaction_query {
|
|
if disabled {
|
|
info!("Widget enabled");
|
|
commands.entity(entity).remove::<InteractionDisabled>();
|
|
} else {
|
|
info!("Widget disabled");
|
|
commands.entity(entity).insert(InteractionDisabled);
|
|
}
|
|
}
|
|
}
|
|
}
|