backpack implementation (#15)
This commit is contained in:
extrawurst
329
src/backpack/backpack_ui.rs
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329
src/backpack/backpack_ui.rs
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@@ -0,0 +1,329 @@
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use super::{BackbackSwapEvent, Backpack, BackpackHead};
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use crate::heads_ui::HeadsImages;
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use bevy::prelude::*;
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static HEAD_SLOTS: usize = 5;
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#[derive(Event, Clone, Copy, Reflect, PartialEq)]
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pub enum BackpackAction {
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Left,
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Right,
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Swap,
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OpenClose,
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}
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#[derive(Component, Default)]
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struct BackpackMarker;
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#[derive(Component, Default)]
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struct BackpackCountText;
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#[derive(Component, Default)]
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struct HeadSelector(pub usize);
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#[derive(Component, Default)]
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struct HeadImage(pub usize);
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#[derive(Component, Default)]
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struct HeadDamage(pub usize);
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#[derive(Resource, Default, Debug)]
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struct BackpackUiState {
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heads: [Option<BackpackHead>; 5],
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scroll: usize,
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count: usize,
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current_slot: usize,
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open: bool,
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}
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impl BackpackUiState {
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fn relative_current_slot(&self) -> usize {
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self.current_slot.saturating_sub(self.scroll)
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}
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}
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pub fn plugin(app: &mut App) {
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app.init_resource::<BackpackUiState>();
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app.add_systems(Startup, setup);
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app.add_systems(
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Update,
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(update, sync_on_change, update_visibility, update_count),
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);
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app.add_observer(swap_head_inputs);
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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let bg = asset_server.load("ui/head_bg.png");
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let regular = asset_server.load("ui/head_regular.png");
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let damage = asset_server.load("ui/head_damage.png");
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let selector = asset_server.load("ui/selector.png");
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commands
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.spawn((
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Name::new("backpack"),
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BackpackMarker,
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Visibility::Hidden,
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Node {
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position_type: PositionType::Absolute,
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top: Val::Px(20.0),
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right: Val::Px(20.0),
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height: Val::Px(74.0),
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..default()
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},
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))
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.with_children(|parent| {
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for i in 0..HEAD_SLOTS {
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spawn_head_ui(
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parent,
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bg.clone(),
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regular.clone(),
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selector.clone(),
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damage.clone(),
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i,
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);
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}
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});
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commands.spawn((
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Text::new("0"),
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BackpackCountText,
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TextFont {
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font: asset_server.load("font.ttf"),
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font_size: 34.0,
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..default()
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},
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TextColor(Color::Srgba(Srgba::rgb(0., 1., 0.))),
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TextLayout::new_with_justify(JustifyText::Center),
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Node {
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position_type: PositionType::Absolute,
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top: Val::Px(20.0),
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right: Val::Px(20.0),
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..default()
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},
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));
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}
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fn spawn_head_ui(
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parent: &mut ChildBuilder,
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bg: Handle<Image>,
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regular: Handle<Image>,
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selector: Handle<Image>,
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damage: Handle<Image>,
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head_slot: usize,
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) {
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const SIZE: f32 = 90.0;
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const DAMAGE_SIZE: f32 = 74.0;
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parent
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.spawn((Node {
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position_type: PositionType::Relative,
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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width: Val::Px(SIZE),
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..default()
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},))
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.with_children(|parent| {
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parent.spawn((
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Name::new("selector"),
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Node {
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position_type: PositionType::Absolute,
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bottom: Val::Px(-30.0),
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..default()
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},
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Visibility::Hidden,
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ImageNode::new(selector).with_flip_y(),
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HeadSelector(head_slot),
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));
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parent.spawn((
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Name::new("bg"),
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Node {
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position_type: PositionType::Absolute,
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..default()
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},
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ImageNode::new(bg),
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));
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parent.spawn((
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Name::new("head"),
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Node {
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position_type: PositionType::Absolute,
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..default()
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},
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ImageNode::default(),
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Visibility::Hidden,
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HeadImage(head_slot),
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));
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parent.spawn((
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Name::new("rings"),
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Node {
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position_type: PositionType::Absolute,
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..default()
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},
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ImageNode::new(regular),
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));
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parent
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.spawn((
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Name::new("health"),
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Node {
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height: Val::Px(DAMAGE_SIZE),
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width: Val::Px(DAMAGE_SIZE),
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..default()
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},
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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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Name::new("damage_ring"),
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HeadDamage(head_slot),
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Node {
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position_type: PositionType::Absolute,
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display: Display::Block,
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overflow: Overflow::clip(),
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top: Val::Px(0.),
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left: Val::Px(0.),
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right: Val::Px(0.),
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height: Val::Percent(25.),
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..default()
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},
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))
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.with_child(ImageNode::new(damage));
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});
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});
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}
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fn update_visibility(
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state: Res<BackpackUiState>,
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mut backpack: Query<&mut Visibility, (With<BackpackMarker>, Without<BackpackCountText>)>,
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mut count: Query<&mut Visibility, (Without<BackpackMarker>, With<BackpackCountText>)>,
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) {
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if state.is_changed() {
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for mut vis in backpack.iter_mut() {
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*vis = if state.open {
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Visibility::Visible
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} else {
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Visibility::Hidden
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};
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}
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for mut vis in count.iter_mut() {
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*vis = if !state.open {
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Visibility::Visible
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} else {
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Visibility::Hidden
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};
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}
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}
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}
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fn update_count(
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state: Res<BackpackUiState>,
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text: Query<Entity, With<BackpackCountText>>,
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mut writer: TextUiWriter,
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) {
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if state.is_changed() {
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let Some(text) = text.iter().next() else {
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return;
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};
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*writer.text(text, 0) = state.count.to_string();
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}
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}
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fn update(
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state: Res<BackpackUiState>,
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heads_images: Res<HeadsImages>,
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mut head_image: Query<(&HeadImage, &mut Visibility, &mut ImageNode), Without<HeadSelector>>,
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mut head_damage: Query<(&HeadDamage, &mut Node), Without<HeadSelector>>,
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mut head_selector: Query<(&HeadSelector, &mut Visibility), Without<HeadImage>>,
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) {
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if state.is_changed() {
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for (HeadImage(head), mut vis, mut image) in head_image.iter_mut() {
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if let Some(head) = &state.heads[*head] {
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*vis = Visibility::Inherited;
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image.image = heads_images.heads[head.head].clone();
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} else {
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*vis = Visibility::Hidden;
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}
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}
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for (HeadDamage(head), mut node) in head_damage.iter_mut() {
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if let Some(head) = &state.heads[*head] {
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node.height = Val::Percent((1. - head.health) * 100.0);
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}
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}
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for (HeadSelector(head), mut vis) in head_selector.iter_mut() {
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*vis = if *head == state.relative_current_slot() {
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Visibility::Inherited
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} else {
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Visibility::Hidden
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};
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}
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}
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}
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fn swap_head_inputs(
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trigger: Trigger<BackpackAction>,
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backpack: Res<Backpack>,
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mut commands: Commands,
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mut state: ResMut<BackpackUiState>,
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) {
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if state.count == 0 {
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return;
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}
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let action = *trigger.event();
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if action == BackpackAction::OpenClose {
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state.open = !state.open;
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}
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if !state.open {
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return;
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}
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let mut changed = false;
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if action == BackpackAction::Left {
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if state.current_slot > 0 {
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state.current_slot -= 1;
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changed = true;
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}
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}
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if action == BackpackAction::Right {
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if state.current_slot < state.count.saturating_sub(1) {
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state.current_slot += 1;
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changed = true;
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}
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}
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if action == BackpackAction::Swap {
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commands.trigger(BackbackSwapEvent(state.current_slot));
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}
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if changed {
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sync(&backpack, &mut state);
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}
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}
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fn sync_on_change(backpack: Res<Backpack>, mut state: ResMut<BackpackUiState>) {
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if backpack.is_changed() {
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sync(&backpack, &mut state);
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}
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}
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fn sync(backpack: &Res<Backpack>, state: &mut ResMut<BackpackUiState>) {
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state.count = backpack.heads.len();
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state.scroll = state.scroll.min(state.count.saturating_sub(HEAD_SLOTS));
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if state.current_slot >= state.scroll + HEAD_SLOTS {
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state.scroll = state.current_slot.saturating_sub(HEAD_SLOTS - 1);
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}
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if state.current_slot < state.scroll {
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state.scroll = state.current_slot;
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}
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for i in 0..HEAD_SLOTS {
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if let Some(head) = backpack.heads.get(i + state.scroll) {
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state.heads[i] = Some(*head);
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} else {
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state.heads[i] = None;
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}
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}
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}
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