feat(Dropdown): enhance dropdown menu with position calculation and closing animations

src/components/Form/Settings/Dropdown/Dropdown.jsx

@@ -44,16 +44,38 @@ const Dropdown = memo((props) => {
     return () => document.removeEventListener('mousedown', handleClickOutside);
   }, [closeDropdown]);
 
-  useEffect(() => {
-    if (isOpen && controlRef.current) {
+  const calculatePosition = useCallback(() => {
+    if (controlRef.current) {
       const rect = controlRef.current.getBoundingClientRect();
-      setMenuPosition({
-        top: rect.bottom + 4,
+      const gap = 4;
+      const viewportHeight = window.innerHeight;
+
+      // Estimate menu height (will be more accurate after first render)
+      const estimatedMenuHeight = Math.min(props.items.filter((i) => i !== null).length * 44, 250);
+
+      // Calculate if dropdown would overflow bottom of viewport
+      const spaceBelow = viewportHeight - rect.bottom - gap;
+      const spaceAbove = rect.top - gap;
+
+      // If not enough space below but more space above, flip to top
+      const shouldFlipUp = spaceBelow < estimatedMenuHeight && spaceAbove > spaceBelow;
+
+      return {
+        top: shouldFlipUp ? rect.top - gap : rect.bottom + gap,
         left: rect.left,
         width: rect.width,
-      });
+        maxHeight: shouldFlipUp ? Math.min(250, spaceAbove) : Math.min(250, spaceBelow),
+        flipped: shouldFlipUp,
+      };
     }
-  }, [isOpen]);
+    return { top: 0, left: 0, width: 0, maxHeight: 250, flipped: false };
+  }, [props.items]);
+
+  const openDropdown = useCallback(() => {
+    const position = calculatePosition();
+    setMenuPosition(position);
+    setIsOpen(true);
+  }, [calculatePosition]);
 
   const onChange = useCallback(
     (newValue) => {
@@ -98,7 +120,7 @@ const Dropdown = memo((props) => {
           if (isOpen) {
             closeDropdown();
           } else {
-            setIsOpen(true);
+            openDropdown();
           }
           break;
         case 'Escape':
@@ -107,7 +129,7 @@ const Dropdown = memo((props) => {
         case 'ArrowDown':
           e.preventDefault();
           if (!isOpen) {
-            setIsOpen(true);
+            openDropdown();
           } else {
             setFocusedIndex((prev) =>
               prev < props.items.filter((i) => i !== null).length - 1 ? prev + 1 : prev,
@@ -122,7 +144,7 @@ const Dropdown = memo((props) => {
           break;
       }
     },
-    [isOpen, props.items, props.disabled],
+    [isOpen, props.items, props.disabled, openDropdown, closeDropdown],
   );
 
   const handleOptionKeyDown = useCallback(
@@ -164,7 +186,7 @@ const Dropdown = memo((props) => {
           if (isOpen) {
             closeDropdown();
           } else {
-            setIsOpen(true);
+            openDropdown();
           }
         }}
         onKeyDown={handleKeyDown}
@@ -181,13 +203,15 @@ const Dropdown = memo((props) => {
         createPortal(
           <div
             ref={menuRef}
-            className={`dropdown-menu ${isClosing ? 'closing' : ''}`}
+            className={`dropdown-menu ${isClosing ? 'closing' : ''} ${menuPosition.flipped ? 'flipped' : ''}`}
             role="listbox"
             style={{
               position: 'fixed',
               top: `${menuPosition.top}px`,
               left: `${menuPosition.left}px`,
               width: `${menuPosition.width}px`,
+              maxHeight: menuPosition.maxHeight ? `${menuPosition.maxHeight}px` : '250px',
+              transform: menuPosition.flipped ? 'translateY(-100%)' : 'none',
             }}
           >
             {props.items.map((item, index) =>

src/components/Form/Settings/Dropdown/Dropdown.scss

@@ -13,6 +13,42 @@
   }
 }
 
+@include keyframes(dropdownSlideOut) {
+  0% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+
+  100% {
+    opacity: 0;
+    transform: translateY(-10px);
+  }
+}
+
+@include keyframes(dropdownSlideInUp) {
+  0% {
+    opacity: 0;
+    transform: translateY(-100%) translateY(10px);
+  }
+
+  100% {
+    opacity: 1;
+    transform: translateY(-100%);
+  }
+}
+
+@include keyframes(dropdownSlideOutUp) {
+  0% {
+    opacity: 1;
+    transform: translateY(-100%);
+  }
+
+  100% {
+    opacity: 0;
+    transform: translateY(-100%) translateY(10px);
+  }
+}
+
 .dropdown {
   position: relative;
   width: 300px;
@@ -21,7 +57,6 @@
   display: flex;
   flex-flow: column;
 
-
   &.disabled {
     opacity: 0.5;
     cursor: not-allowed;
@@ -121,98 +156,107 @@
       transform: rotate(180deg);
     }
   }
+}
 
-  .dropdown-menu {
-    position: absolute;
-    top: calc(100% + 4px);
-    left: 0;
-    right: 0;
-    max-height: 250px;
-    overflow-y: auto;
-    z-index: 9999;
-    @include animation(dropdownSlideIn 0.2s ease-out);
+.dropdown-menu {
+  max-height: 250px;
+  overflow-y: auto;
+  z-index: 9999;
+  @include animation(dropdownSlideIn 0.2s ease-out);
+  will-change: transform, opacity;
 
-    @include themed {
-      background: t($modal-background);
-      border: 1px solid t($modal-sidebarActive);
-      border-radius: t($borderRadius);
-      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
-    }
+  @include themed {
+    background: t($modal-background);
+    border: 1px solid t($modal-sidebarActive);
+    border-radius: t($borderRadius);
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  }
 
-    &::-webkit-scrollbar {
-      width: 6px;
-    }
+  &.flipped {
+    @include animation(dropdownSlideInUp 0.2s ease-out);
 
-    &::-webkit-scrollbar-track {
-      @include themed {
-        background: t($modal-sidebar);
-      }
-    }
-
-    &::-webkit-scrollbar-thumb {
-      @include themed {
-        background: t($modal-sidebarActive);
-        border-radius: 3px;
-      }
-
-      &:hover {
-        @include themed {
-          background: t($color);
-        }
-      }
+    &.closing {
+      @include animation(dropdownSlideOutUp 0.2s ease-out forwards);
     }
   }
 
-  .dropdown-option {
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    gap: 8px;
-    padding: 12px 16px;
-    cursor: pointer;
-    transition: all 0.15s ease;
-    outline: none;
+  &.closing:not(.flipped) {
+    @include animation(dropdownSlideOut 0.2s ease-out forwards);
+  }
 
+  &::-webkit-scrollbar {
+    width: 6px;
+  }
+
+  &::-webkit-scrollbar-track {
     @include themed {
-      color: t($color);
+      background: t($modal-sidebar);
+    }
+  }
 
-      &:hover {
-        background: t($modal-sidebarActive);
-        padding-left: 20px;
-      }
-
-      &.selected {
-        background: t($modal-sidebar);
-        font-weight: 500;
-      }
-
-      &.focused {
-        background: t($modal-sidebarActive);
-        border-left: 2px solid t($link);
-      }
+  &::-webkit-scrollbar-thumb {
+    @include themed {
+      background: t($modal-sidebarActive);
+      border-radius: 3px;
     }
 
-    .dropdown-option-text {
-      flex: 1;
-      overflow: hidden;
-      text-overflow: ellipsis;
-      white-space: nowrap;
-    }
-
-    .dropdown-option-check {
-      flex-shrink: 0;
-      font-size: 14px;
-      width: 20px;
-      height: 20px;
-      border-radius: 50%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-
+    &:hover {
       @include themed {
-        background: t($link);
-        color: white;
+        background: t($color);
       }
     }
   }
 }
+
+.dropdown-option {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 12px 16px;
+  cursor: pointer;
+  transition: all 0.15s ease;
+  outline: none;
+
+  @include themed {
+    color: t($color);
+
+    &:hover {
+      background: t($modal-sidebarActive);
+      padding-left: 20px;
+    }
+
+    &.selected {
+      background: t($modal-sidebar);
+      font-weight: 500;
+    }
+
+    &.focused {
+      background: t($modal-sidebarActive);
+      border-left: 2px solid t($link);
+    }
+  }
+
+  .dropdown-option-text {
+    flex: 1;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+
+  .dropdown-option-check {
+    flex-shrink: 0;
+    font-size: 14px;
+    width: 20px;
+    height: 20px;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    @include themed {
+      background: t($link);
+      color: white;
+    }
+  }
+}