refactor(react): use memoization where appropriate

apps/client/src/widgets/bulk_actions/BulkAction.tsx

@@ -1,4 +1,5 @@
 import { ComponentChildren } from "preact";
+import { memo } from "preact/compat";
 import AbstractBulkAction from "./abstract_bulk_action";
 
 interface BulkActionProps {
@@ -8,12 +9,17 @@ interface BulkActionProps {
     bulkAction: AbstractBulkAction;
 }
 
-export default function BulkAction({ label, children, helpText, bulkAction }: BulkActionProps) {
+// Define styles as constants to prevent recreation
+const flexContainerStyle = { display: "flex", alignItems: "center" } as const;
+const labelStyle = { marginRight: "10px" } as const;
+const textStyle = { marginRight: "10px", marginLeft: "10px" } as const;
+
+const BulkAction = memo(({ label, children, helpText, bulkAction }: BulkActionProps) => {
     return (
         <tr>
             <td colSpan={2}>
-                <div style={{ display: "flex", alignItems: "center" }}>
+                <div style={flexContainerStyle}>
-                    <div style={{ marginRight: "10px" }} className="text-nowrap">{label}</div>
+                    <div style={labelStyle} className="text-nowrap">{label}</div>
 
                     {children}
                 </div>
@@ -33,14 +39,16 @@ export default function BulkAction({ label, children, helpText, bulkAction }: Bu
             </td>
         </tr>
     );
-}
+});
 
-export function BulkActionText({ text }: { text: string }) {
+export default BulkAction;
+
+export const BulkActionText = memo(({ text }: { text: string }) => {
     return (
         <div
-            style={{ marginRight: "10px", marginLeft: "10px" }}
+            style={textStyle}
             className="text-nowrap">
                 {text}
             </div>
     );
-}
+});

apps/client/src/widgets/react/Button.tsx

@@ -1,6 +1,7 @@
 import type { RefObject } from "preact";
 import type { CSSProperties } from "preact/compat";
-import { useRef } from "preact/hooks";
+import { useRef, useMemo } from "preact/hooks";
+import { memo } from "preact/compat";
 
 interface ButtonProps {
     /** Reference to the button element. Mostly useful for requesting focus. */
@@ -17,26 +18,41 @@ interface ButtonProps {
     style?: CSSProperties;
 }
 
-export default function Button({ buttonRef: _buttonRef, className, text, onClick, keyboardShortcut, icon, primary, disabled, small, style }: ButtonProps) {
+const Button = memo(({ buttonRef: _buttonRef, className, text, onClick, keyboardShortcut, icon, primary, disabled, small, style }: ButtonProps) => {
-    const classes: string[] = ["btn"];
+    // Memoize classes array to prevent recreation
+    const classes = useMemo(() => {
+        const classList: string[] = ["btn"];
         if (primary) {
-        classes.push("btn-primary");
+            classList.push("btn-primary");
         } else {
-        classes.push("btn-secondary");
+            classList.push("btn-secondary");
         }
         if (className) {
-        classes.push(className);
+            classList.push(className);
         }
         if (small) {
-        classes.push("btn-sm");
+            classList.push("btn-sm");
         }
+        return classList.join(" ");
+    }, [primary, className, small]);
 
     const buttonRef = _buttonRef ?? useRef<HTMLButtonElement>(null);
-    const splitShortcut = (keyboardShortcut ?? "").split("+");
+    
+    // Memoize keyboard shortcut rendering
+    const shortcutElements = useMemo(() => {
+        if (!keyboardShortcut) return null;
+        const splitShortcut = keyboardShortcut.split("+");
+        return splitShortcut.map((key, index) => (
+            <>
+                <kbd key={index}>{key.toUpperCase()}</kbd>
+                {index < splitShortcut.length - 1 ? "+" : ""}
+            </>
+        ));
+    }, [keyboardShortcut]);
 
     return (
         <button
-            className={classes.join(" ")}
+            className={classes}
             type={onClick ? "button" : "submit"}
             onClick={onClick}
             ref={buttonRef}
@@ -44,13 +60,9 @@ export default function Button({ buttonRef: _buttonRef, className, text, onClick
             style={style}
         >
             {icon && <span className={`bx ${icon}`}></span>}
-            {text} {keyboardShortcut && (
+            {text} {shortcutElements}
-                splitShortcut.map((key, index) => (
-                    <>
-                        <kbd key={index}>{key.toUpperCase()}</kbd>{ index < splitShortcut.length - 1 ? "+" : "" }
-                    </>
-                ))
-            )}
         </button>
     );
-}
+});
+
+export default Button;

apps/client/src/widgets/react/FormCheckbox.tsx

@@ -1,7 +1,8 @@
 import { Tooltip } from "bootstrap";
-import { useEffect, useRef } from "preact/hooks";
+import { useEffect, useRef, useMemo, useCallback } from "preact/hooks";
 import { escapeQuotes } from "../../services/utils";
 import { ComponentChildren } from "preact";
+import { memo } from "preact/compat";
 
 interface FormCheckboxProps {
     name: string;
@@ -15,28 +16,41 @@ interface FormCheckboxProps {
     onChange(newValue: boolean): void;
 }
 
-export default function FormCheckbox({ name, disabled, label, currentValue, onChange, hint }: FormCheckboxProps) {
+const FormCheckbox = memo(({ name, disabled, label, currentValue, onChange, hint }: FormCheckboxProps) => {
     const labelRef = useRef<HTMLLabelElement>(null);
 
-    if (hint) {
+    // Fix: Move useEffect outside conditional
     useEffect(() => {
-            let tooltipInstance: Tooltip | null = null;
+        if (!hint || !labelRef.current) return;
-            if (labelRef.current) {
+        
-                tooltipInstance = Tooltip.getOrCreateInstance(labelRef.current, {
+        const tooltipInstance = Tooltip.getOrCreateInstance(labelRef.current, {
             html: true,
             template: '<div class="tooltip tooltip-top" role="tooltip"><div class="arrow"></div><div class="tooltip-inner"></div></div>'
         });
-            }
+        
         return () => tooltipInstance?.dispose();
-        }, [labelRef.current]);
+    }, [hint]); // Proper dependency
-    }
+
+    // Memoize style object
+    const labelStyle = useMemo(() => 
+        hint ? { textDecoration: "underline dotted var(--main-text-color)" } : undefined,
+        [hint]
+    );
+    
+    // Memoize onChange handler
+    const handleChange = useCallback((e: Event) => {
+        onChange((e.target as HTMLInputElement).checked);
+    }, [onChange]);
+    
+    // Memoize title attribute
+    const titleText = useMemo(() => hint ? escapeQuotes(hint) : undefined, [hint]);
 
     return (
         <div className="form-checkbox">
             <label
                 className="form-check-label tn-checkbox"
-                style={hint && { textDecoration: "underline dotted var(--main-text-color)" }}
+                style={labelStyle}
-                title={hint && escapeQuotes(hint)}
+                title={titleText}
                 ref={labelRef}
             >
                 <input
@@ -46,9 +60,11 @@ export default function FormCheckbox({ name, disabled, label, currentValue, onCh
                     checked={currentValue || false}
                     value="1"
                     disabled={disabled}
-                    onChange={e => onChange((e.target as HTMLInputElement).checked)} />
+                    onChange={handleChange} />
                 {label}
             </label>
         </div>
     );
-}
+});
+
+export default FormCheckbox;

apps/client/src/widgets/react/Modal.tsx

@@ -1,10 +1,11 @@
-import { useContext, useEffect, useRef } from "preact/hooks";
+import { useContext, useEffect, useRef, useMemo, useCallback } from "preact/hooks";
 import { t } from "../../services/i18n";
 import { ComponentChildren } from "preact";
 import type { CSSProperties, RefObject } from "preact/compat";
 import { openDialog } from "../../services/dialog";
 import { ParentComponent } from "./ReactBasicWidget";
 import { Modal as BootstrapModal } from "bootstrap";
+import { memo } from "preact/compat";
 
 interface ModalProps {
     className: string;
@@ -101,18 +102,25 @@ export default function Modal({ children, className, size, title, header, footer
         }
     }, [ show ]);
 
-    const dialogStyle: CSSProperties = {};
+    // Memoize styles to prevent recreation on every render
+    const dialogStyle = useMemo<CSSProperties>(() => {
+        const style: CSSProperties = {};
         if (zIndex) {
-        dialogStyle.zIndex = zIndex;
+            style.zIndex = zIndex;
         }
+        return style;
+    }, [zIndex]);
 
-    const documentStyle: CSSProperties = {};
+    const documentStyle = useMemo<CSSProperties>(() => {
+        const style: CSSProperties = {};
         if (maxWidth) {
-        documentStyle.maxWidth = `${maxWidth}px`;
+            style.maxWidth = `${maxWidth}px`;
         }
         if (minWidth) {
-        documentStyle.minWidth = minWidth;
+            style.minWidth = minWidth;
         }
+        return style;
+    }, [maxWidth, minWidth]);
 
     return (
         <div className={`modal fade mx-auto ${className}`} tabIndex={-1} style={dialogStyle} role="dialog" ref={modalRef}>
@@ -132,10 +140,10 @@ export default function Modal({ children, className, size, title, header, footer
                     </div>
 
                     {onSubmit ? (
-                        <form ref={formRef} onSubmit={(e) => {
+                        <form ref={formRef} onSubmit={useCallback((e) => {
                             e.preventDefault();
                             onSubmit();
-                        }}>
+                        }, [onSubmit])}>
                             <ModalInner footer={footer} bodyStyle={bodyStyle} footerStyle={footerStyle} footerAlignment={footerAlignment}>{children}</ModalInner>
                         </form>
                     ) : (
@@ -149,11 +157,15 @@ export default function Modal({ children, className, size, title, header, footer
     );
 }
 
-function ModalInner({ children, footer, footerAlignment, bodyStyle, footerStyle: _footerStyle }: Pick<ModalProps, "children" | "footer" | "footerAlignment" | "bodyStyle" | "footerStyle">) {
+const ModalInner = memo(({ children, footer, footerAlignment, bodyStyle, footerStyle: _footerStyle }: Pick<ModalProps, "children" | "footer" | "footerAlignment" | "bodyStyle" | "footerStyle">) => {
-    const footerStyle: CSSProperties = _footerStyle ?? {};
+    // Memoize footer style
+    const footerStyle = useMemo<CSSProperties>(() => {
+        const style: CSSProperties = _footerStyle ?? {};
         if (footerAlignment === "between") {
-        footerStyle.justifyContent = "space-between";
+            style.justifyContent = "space-between";
         }
+        return style;
+    }, [_footerStyle, footerAlignment]);
 
     return (
         <>
@@ -168,4 +180,4 @@ function ModalInner({ children, footer, footerAlignment, bodyStyle, footerStyle:
             )}
         </>
     );
-}
+});