App: store selection in hash map

Switch `Assembly.elements` to a hash map too, since that's probably
closer to what we'll want in the future.

app-proto/sketch-outline/Cargo.toml

@@ -11,6 +11,7 @@ default = ["console_error_panic_hook"]
 itertools = "0.13.0"
 js-sys = "0.3.70"
 nalgebra = "0.33.0"
+rustc-hash = "2.0.0"
 sycamore = "0.9.0-beta.3"
 
 # The `console_error_panic_hook` crate provides better debugging of panics by

app-proto/sketch-outline/src/assembly.rs

@@ -1,4 +1,5 @@
 use nalgebra::DVector;
+use rustc_hash::FxHashMap;
 use sycamore::reactive::Signal;
 
 #[derive(Clone, PartialEq)]
@@ -6,16 +7,12 @@ pub struct Element {
     pub id: String,
     pub label: String,
     pub color: [f32; 3],
-    pub rep: DVector<f64>,
+    pub rep: DVector<f64>
-    
-    /* TO DO */
-    // does this belong in the element data?
-    pub selected: Signal<bool>
 }
 
 // a complete, view-independent description of an assembly
 #[derive(Clone)]
 pub struct Assembly {
     // the order of the elements is arbitrary, and it could change at any time
-    pub elements: Signal<Vec<Element>>
+    pub elements: Signal<FxHashMap<String, Element>>
 }

app-proto/sketch-outline/src/display.rs

@@ -102,8 +102,7 @@ pub fn Display() -> View {
     // change listener
     let scene_changed = create_signal(true);
     create_effect(move || {
-        let elements = state.assembly.elements.get_clone();
+        state.selection.track();
-        for elt in elements { elt.selected.track(); }
         scene_changed.set(true);
     });
     
@@ -289,17 +288,21 @@ pub fn Display() -> View {
                 
                 // get the assembly
                 let elements = state.assembly.elements.get_clone();
-                let element_iter = (&elements).into_iter();
+                let element_iter = (&elements).values();
                 let reps_world: Vec<_> = element_iter.clone().map(|elt| &assembly_to_world * &elt.rep).collect();
                 let colors: Vec<_> = element_iter.clone().map(|elt|
-                    if elt.selected.get() {
+                    if state.selection.with(|sel| sel.contains(&elt.id)) {
                         elt.color.map(|ch| 0.2 + 0.8*ch)
                     } else {
                         elt.color
                     }
                 ).collect();
                 let highlights: Vec<_> = element_iter.map(|elt|
-                    if elt.selected.get() { 1.0_f32 } else { HIGHLIGHT }
+                    if state.selection.with(|sel| sel.contains(&elt.id)) {
+                        1.0_f32
+                    } else {
+                        HIGHLIGHT
+                    }
                 ).collect();
                 
                 // set the resolution

app-proto/sketch-outline/src/main.rs

@@ -3,6 +3,7 @@ mod display;
 mod outline;
 
 use nalgebra::DVector;
+use rustc_hash::{FxHashMap, FxHashSet};
 use sycamore::prelude::*;
 
 use assembly::{Assembly, Element};
@@ -11,40 +12,52 @@ use outline::Outline;
 
 #[derive(Clone)]
 struct AppState {
-    assembly: Assembly
+    assembly: Assembly,
+    selection: Signal<FxHashSet<String>>
 }
 
 fn main() {
     sycamore::render(|| {
-        provide_context(
+        let state = AppState {
-            AppState {
             assembly: Assembly {
-                    elements: create_signal(vec![
+                elements: create_signal(FxHashMap::default())
+            },
+            selection: create_signal(FxHashSet::default())
+        };
+        state.assembly.elements.update(
+            |elts| elts.insert(
+                "wing_a".to_string(),
                 Element {
                     id: String::from("wing_a"),
                     label: String::from("Wing A"),
                     color: [1.00_f32, 0.25_f32, 0.00_f32],
-                            rep: DVector::<f64>::from_column_slice(&[0.5, 0.5, 0.0, 0.5, -0.25]),
+                    rep: DVector::<f64>::from_column_slice(&[0.5, 0.5, 0.0, 0.5, -0.25])
-                            selected: create_signal(false)
+                }
-                        },
+            )
+        );
+        state.assembly.elements.update(
+            |elts| elts.insert(
+                "wing_b".to_string(),
                 Element {
                     id: String::from("wing_b"),
                     label: String::from("Wing B"),
                     color: [0.00_f32, 0.25_f32, 1.00_f32],
-                            rep: DVector::<f64>::from_column_slice(&[-0.5, -0.5, 0.0, 0.5, -0.25]),
+                    rep: DVector::<f64>::from_column_slice(&[-0.5, -0.5, 0.0, 0.5, -0.25])
-                            selected: create_signal(false)
                 },
+            )
+        );
+        state.assembly.elements.update(
+            |elts| elts.insert(
+                "central".to_string(),
                 Element {
                     id: String::from("central"),
                     label: String::from("Central"),
                     color: [0.75_f32, 0.75_f32, 0.75_f32],
-                            rep: DVector::<f64>::from_column_slice(&[0.0, 0.0, 0.0, 0.4, -0.625]),
+                    rep: DVector::<f64>::from_column_slice(&[0.0, 0.0, 0.0, 0.4, -0.625])
-                            selected: create_signal(false)
-                        }
-                    ])
-                }
                 }
+            )
         );
+        provide_context(state);
         
         view! {
             Outline {}

app-proto/sketch-outline/src/outline.rs

@@ -6,25 +6,33 @@ use crate::AppState;
 
 #[component]
 pub fn Outline() -> View {
-    let state = use_context::<AppState>();
-    
     // sort the elements alphabetically by ID
-    let elements_sorted = create_memo(move ||
+    let elements_sorted = create_memo(|| {
+        let state = use_context::<AppState>();
         state.assembly.elements
             .get_clone()
             .into_iter()
-            .sorted_by_key(|elt| elt.id.clone())
+            .sorted_by_key(|(id, _)| id.clone())
+            .map(|(_, elt)| elt)
             .collect()
-    );
+    });
     
     view! {
         ul {
             Keyed(
                 list=elements_sorted,
                 view=|elt| {
-                    let class = create_memo(move ||
+                    let state = use_context::<AppState>();
-                        if elt.selected.get() { "selected" } else { "" }
+                    let class = create_memo({
-                    );
+                        let id = elt.id.clone();
+                        move || {
+                            if state.selection.with(|sel| sel.contains(&id)) {
+                                "selected"
+                            } else {
+                                ""
+                            }
+                        }
+                    });
                     let label = elt.label.clone();
                     let rep_components = elt.rep.iter().map(|u| {
                         let u_coord = u.to_string().replace("-", "\u{2212}");
@@ -36,15 +44,29 @@ pub fn Outline() -> View {
                         li(
                             class=class.get(),
                             tabindex="0",
-                            on:click=move |_| {
+                            on:click={
-                                elt.selected.set_fn(|sel| !sel);
+                                let id = elt.id.clone();
+                                move |_| {
+                                    state.selection.update(|sel| {
+                                        if !sel.remove(&id) {
+                                            sel.insert(id.clone());
+                                        }
+                                    });
+                                }
                             },
-                            on:keydown=move |event: KeyboardEvent| {
+                            on:keydown={
+                                let id = elt.id.clone();
+                                move |event: KeyboardEvent| {
                                     if event.key() == "Enter" {
-                                    elt.selected.set_fn(|sel| !sel);
+                                        state.selection.update(|sel| {
+                                            if !sel.remove(&id) {
+                                                sel.insert(id.clone());
+                                            }
+                                        });
                                         event.prevent_default();
                                     }
                                 }
+                            }
                         ) {
                             div(class="elt-label") { (label) }
                             div(class="elt-rep") { (rep_components) }