feat([2fd88f42]): redesign filter panel with modern checkbox UI

heatmap-tool/frontend/src/components/FilterPanel.tsx

@@ -14,61 +14,80 @@ interface FilterPanelProps {
 const FilterPanel: React.FC<FilterPanelProps> = ({ filters, onFilterChange, isLoading }) => {
   const [selectedFilters, setSelectedFilters] = useState<FilterOptions>({});
 
-  // Reset selected filters when a new file is uploaded (filters prop changes)
   useEffect(() => {
     setSelectedFilters({});
   }, [filters]);
 
-  const handleSelectionChange = (category: string, values: string[]) => {
+  const handleCheckboxChange = (category: string, value: string) => {
-    setSelectedFilters(prev => ({
+    setSelectedFilters(prev => {
-      ...prev,
+      const currentSelection = prev[category] || [];
-      [category]: values,
+      const newSelection = currentSelection.includes(value)
-    }));
+        ? currentSelection.filter(item => item !== value)
+        // Ensure "N/A" is not sorted to the top if that's not desired
+        : [...currentSelection, value].sort((a, b) => a === 'N/A' ? 1 : b === 'N/A' ? -1 : a.localeCompare(b));
+      return { ...prev, [category]: newSelection };
+    });
   };
 
   const handleApplyClick = () => {
     onFilterChange(selectedFilters);
-  }
+  };
 
   const handleResetClick = () => {
     setSelectedFilters({});
     onFilterChange({});
-  }
+  };
 
   if (Object.keys(filters).length === 0) {
     return <div>Upload a file to see filter options.</div>;
   }
 
   return (
+    <>
+      <style>{`
+        .filter-panel { padding-top: 20px; }
+        .filter-group { margin-bottom: 15px; }
+        .filter-group summary { font-weight: bold; cursor: pointer; padding: 5px; background-color: #444; border-radius: 4px; }
+        .filter-options { max-height: 200px; overflow-y: auto; padding: 10px; background-color: #2a2a2a; border-radius: 4px; margin-top: 5px;}
+        .filter-option { display: flex; align-items: center; margin-bottom: 5px; }
+        .filter-option input { margin-right: 10px; }
+        .filter-buttons { margin-top: 20px; display: flex; justify-content: space-between; }
+        .filter-buttons button { width: 48%; padding: 10px; border: none; border-radius: 4px; cursor: pointer; }
+        .apply-button { background-color: #4CAF50; color: white; }
+        .reset-button { background-color: #f44336; color: white; }
+        .filter-buttons button:disabled { background-color: #555; cursor: not-allowed; }
+      `}</style>
       <div className="filter-panel">
         <h3>Filters</h3>
         {Object.entries(filters).map(([category, options]) => (
-        <div key={category} className="filter-group">
+          <details key={category} className="filter-group" open>
-          <label>{category}</label>
+            <summary>{category}</summary>
-          <select
+            <div className="filter-options">
-            multiple
-            value={selectedFilters[category] || []}
-            onChange={(e) =>
-              handleSelectionChange(category, Array.from(e.target.selectedOptions, option => option.value))
-            }
-          >
               {options.map(option => (
-              <option key={option} value={option}>
+                <div key={option} className="filter-option">
-                {option}
+                  <input
-              </option>
+                    type="checkbox"
-            ))}
+                    id={`${category}-${option}`}
-          </select>
+                    value={option}
+                    checked={(selectedFilters[category] || []).includes(option)}
+                    onChange={() => handleCheckboxChange(category, option)}
+                  />
+                  <label htmlFor={`${category}-${option}`}>{option}</label>
                 </div>
               ))}
+            </div>
+          </details>
+        ))}
         <div className="filter-buttons">
-        <button onClick={handleApplyClick} disabled={isLoading}>
+          <button onClick={handleApplyClick} disabled={isLoading} className="apply-button">
             {isLoading ? 'Loading...' : 'Apply Filters'}
           </button>
-        <button onClick={handleResetClick} disabled={isLoading}>
+          <button onClick={handleResetClick} disabled={isLoading} className="reset-button">
-            Reset Filters
+            Reset
           </button>
         </div>
       </div>
+    </>
   );
 };