compiled autocomplete

canvas/src/autocomplete.rs

@@ -0,0 +1,126 @@
+// canvas/src/autocomplete.rs
+
+/// Generic suggestion item that clients push to canvas
+#[derive(Debug, Clone)]
+pub struct SuggestionItem<T> {
+    /// The underlying data (client-specific, e.g., Hit, String, etc.)
+    pub data: T,
+    /// Text to display in the dropdown
+    pub display_text: String,
+    /// Value to store in the form field when selected
+    pub value_to_store: String,
+}
+
+impl<T> SuggestionItem<T> {
+    pub fn new(data: T, display_text: String, value_to_store: String) -> Self {
+        Self {
+            data,
+            display_text,
+            value_to_store,
+        }
+    }
+    
+    /// Convenience constructor for simple string suggestions
+    pub fn simple(data: T, text: String) -> Self {
+        Self {
+            data,
+            display_text: text.clone(),
+            value_to_store: text,
+        }
+    }
+}
+
+/// Autocomplete state managed by canvas
+#[derive(Debug, Clone)]
+pub struct AutocompleteState<T> {
+    /// Whether autocomplete is currently active/visible
+    pub is_active: bool,
+    /// Whether suggestions are being loaded (for spinner/loading indicator)
+    pub is_loading: bool,
+    /// Current suggestions to display
+    pub suggestions: Vec<SuggestionItem<T>>,
+    /// Currently selected suggestion index
+    pub selected_index: Option<usize>,
+    /// Field index that triggered autocomplete (for context)
+    pub active_field: Option<usize>,
+}
+
+impl<T> Default for AutocompleteState<T> {
+    fn default() -> Self {
+        Self {
+            is_active: false,
+            is_loading: false,
+            suggestions: Vec::new(),
+            selected_index: None,
+            active_field: None,
+        }
+    }
+}
+
+impl<T> AutocompleteState<T> {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    
+    /// Activate autocomplete for a specific field
+    pub fn activate(&mut self, field_index: usize) {
+        self.is_active = true;
+        self.active_field = Some(field_index);
+        self.selected_index = None;
+        self.suggestions.clear();
+        self.is_loading = true;
+    }
+    
+    /// Deactivate autocomplete and clear state
+    pub fn deactivate(&mut self) {
+        self.is_active = false;
+        self.is_loading = false;
+        self.suggestions.clear();
+        self.selected_index = None;
+        self.active_field = None;
+    }
+    
+    /// Set suggestions and stop loading
+    pub fn set_suggestions(&mut self, suggestions: Vec<SuggestionItem<T>>) {
+        self.suggestions = suggestions;
+        self.is_loading = false;
+        self.selected_index = if self.suggestions.is_empty() { 
+            None 
+        } else { 
+            Some(0) 
+        };
+    }
+    
+    /// Move selection down
+    pub fn select_next(&mut self) {
+        if !self.suggestions.is_empty() {
+            let current = self.selected_index.unwrap_or(0);
+            self.selected_index = Some((current + 1) % self.suggestions.len());
+        }
+    }
+    
+    /// Move selection up
+    pub fn select_previous(&mut self) {
+        if !self.suggestions.is_empty() {
+            let current = self.selected_index.unwrap_or(0);
+            self.selected_index = Some(
+                if current == 0 { 
+                    self.suggestions.len() - 1 
+                } else { 
+                    current - 1 
+                }
+            );
+        }
+    }
+    
+    /// Get currently selected suggestion
+    pub fn get_selected(&self) -> Option<&SuggestionItem<T>> {
+        self.selected_index
+            .and_then(|idx| self.suggestions.get(idx))
+    }
+    
+    /// Check if autocomplete is ready for interaction (active and has suggestions)
+    pub fn is_ready(&self) -> bool {
+        self.is_active && !self.suggestions.is_empty() && !self.is_loading
+    }
+}