feat: auto complete component add keyboard event (#31) (closes #28)

src/auto_complete/auto-complete.css

@@ -14,6 +14,7 @@
     border-radius: 2px;
     cursor: pointer;
 }
-.thaw-auto-complete__menu-item:hover {
+
+.thaw-auto-complete__menu-item--selected {
     background-color: var(--thaw-background-color-hover);
 }

src/auto_complete/mod.rs

@@ -40,23 +40,78 @@ pub fn AutoComplete(
         css_vars
     });
 
+    let select_option_index = create_rw_signal::<usize>(0);
+    let menu_ref = create_node_ref::<html::Div>();
     let is_show_menu = create_rw_signal(false);
     let auto_complete_ref = create_node_ref::<html::Div>();
     let options = StoredMaybeSignal::from(options);
+    let open_menu = move || {
+        select_option_index.set(0);
+        is_show_menu.set(true);
+    };
     let allow_value = move |_| {
         if !is_show_menu.get_untracked() {
-            is_show_menu.set(true);
+            open_menu();
         }
         true
     };
 
+    let select_value = move |option_value: String| {
+        if clear_after_select.get_untracked() {
+            value.set(String::new());
+        } else {
+            value.set(option_value.clone());
+        }
+        if let Some(on_select) = on_select {
+            on_select.call(option_value);
+        }
+        is_show_menu.set(false);
+    };
+
+    let on_keydown = move |event: ev::KeyboardEvent| {
+        if !is_show_menu.get_untracked() {
+            return;
+        }
+        let key = event.key();
+        if key == "ArrowDown".to_string() {
+            select_option_index.update(|index| {
+                if *index == options.with_untracked(|options| options.len()) - 1 {
+                    *index = 0
+                } else {
+                    *index += 1
+                }
+            });
+        } else if key == "ArrowUp".to_string() {
+            select_option_index.update(|index| {
+                if *index == 0 {
+                    *index = options.with_untracked(|options| options.len()) - 1;
+                } else {
+                    *index -= 1
+                }
+            });
+        } else if key == "Enter".to_string() {
+            let option_value = options.with_untracked(|options| {
+                let index = select_option_index.get_untracked();
+                if options.len() > index {
+                    let option = &options[index];
+                    Some(option.value.clone())
+                } else {
+                    None
+                }
+            });
+            if let Some(option_value) = option_value {
+                select_value(option_value);
+            }
+        }
+    };
+
     view! {
         <Binder target_ref=auto_complete_ref>
-            <div class="thaw-auto-complete" ref=auto_complete_ref>
+            <div class="thaw-auto-complete" ref=auto_complete_ref on:keydown=on_keydown>
                 <Input
                     value
                     placeholder
-                    on_focus=move |_| is_show_menu.set(true)
+                    on_focus=move |_| open_menu()
                     on_blur=move |_| is_show_menu.set(false)
                     allow_value
                 />
@@ -67,33 +122,59 @@ pub fn AutoComplete(
                 placement=FollowerPlacement::BottomStart
                 width=FollowerWidth::Target
             >
-                <div class="thaw-auto-complete__menu" style=move || menu_css_vars.get()>
+                <div
+                    class="thaw-auto-complete__menu"
+                    style=move || menu_css_vars.get()
+                    ref=menu_ref
+                >
 
                     {move || {
                         options
                             .get()
                             .into_iter()
-                            .map(|v| {
+                            .enumerate()
+                            .map(|(index, v)| {
                                 let AutoCompleteOption { value: option_value, label } = v;
+                                let menu_item_ref = create_node_ref::<html::Div>();
                                 let on_click = move |_| {
-                                    if clear_after_select.get_untracked() {
-                                        value.set(String::new());
-                                    } else {
-                                        value.set(option_value.clone());
-                                    }
-                                    if let Some(on_select) = on_select {
-                                        on_select.call(option_value.clone());
-                                    }
-                                    is_show_menu.set(false);
+                                    select_value(option_value.clone());
+                                };
+                                let on_mouseenter = move |_| {
+                                    select_option_index.set(index);
                                 };
                                 let on_mousedown = move |ev: ev::MouseEvent| {
                                     ev.prevent_default();
                                 };
+                                create_effect(move |_| {
+                                    if index == select_option_index.get() {
+                                        if !is_show_menu.get() {
+                                            return;
+                                        }
+                                        if let Some(menu_item_ref) = menu_item_ref.get() {
+                                            let menu_ref = menu_ref.get().unwrap();
+                                            let menu_rect = menu_ref.get_bounding_client_rect();
+                                            let item_rect = menu_item_ref.get_bounding_client_rect();
+                                            if item_rect.y() < menu_rect.y() {
+                                                menu_item_ref.scroll_into_view_with_bool(true);
+                                            } else if item_rect.y() + item_rect.height()
+                                                > menu_rect.y() + menu_rect.height()
+                                            {
+                                                menu_item_ref.scroll_into_view_with_bool(false);
+                                            }
+                                        }
+                                    }
+                                });
                                 view! {
                                     <div
                                         class="thaw-auto-complete__menu-item"
+                                        class=(
+                                            "thaw-auto-complete__menu-item--selected",
+                                            move || index == select_option_index.get(),
+                                        )
                                         on:click=on_click
                                         on:mousedown=on_mousedown
+                                        on:mouseenter=on_mouseenter
+                                        ref=menu_item_ref
                                     >
                                         {label}
                                     </div>

src/utils/stored_maybe_signal.rs

@@ -1,4 +1,7 @@
-use leptos::{MaybeSignal, Signal, SignalGet, SignalGetUntracked, SignalWith, StoredValue};
+use leptos::{
+    MaybeSignal, Signal, SignalGet, SignalGetUntracked, SignalWith, SignalWithUntracked,
+    StoredValue,
+};
 
 #[derive(Clone)]
 pub enum StoredMaybeSignal<T>
@@ -65,6 +68,24 @@ impl<T> SignalWith for StoredMaybeSignal<T> {
     }
 }
 
+impl<T> SignalWithUntracked for StoredMaybeSignal<T> {
+    type Value = T;
+
+    fn with_untracked<O>(&self, f: impl FnOnce(&Self::Value) -> O) -> O {
+        match self {
+            StoredMaybeSignal::StoredValue(value) => value.with_value(f),
+            StoredMaybeSignal::Signal(signal) => signal.with_untracked(f),
+        }
+    }
+
+    fn try_with_untracked<O>(&self, f: impl FnOnce(&Self::Value) -> O) -> Option<O> {
+        match self {
+            StoredMaybeSignal::StoredValue(value) => value.try_with_value(f),
+            StoredMaybeSignal::Signal(signal) => signal.try_with_untracked(f),
+        }
+    }
+}
+
 impl<T> From<MaybeSignal<T>> for StoredMaybeSignal<T> {
     fn from(value: MaybeSignal<T>) -> Self {
         match value {