feat: add dropdown to select preview port (#17)

packages/bolt/app/components/workbench/PortDropdown.tsx

@@ -0,0 +1,83 @@
+import { memo, useEffect, useRef } from 'react';
+import { IconButton } from '~/components/ui/IconButton';
+import type { PreviewInfo } from '~/lib/stores/previews';
+
+interface PortDropdownProps {
+  activePreviewIndex: number;
+  setActivePreviewIndex: (index: number) => void;
+  isDropdownOpen: boolean;
+  setIsDropdownOpen: (value: boolean) => void;
+  setHasSelectedPreview: (value: boolean) => void;
+  previews: PreviewInfo[];
+}
+
+export const PortDropdown = memo(
+  ({
+    activePreviewIndex,
+    setActivePreviewIndex,
+    isDropdownOpen,
+    setIsDropdownOpen,
+    setHasSelectedPreview,
+    previews,
+  }: PortDropdownProps) => {
+    const dropdownRef = useRef<HTMLDivElement>(null);
+
+    // sort previews, preserving original index
+    const sortedPreviews = previews
+      .map((previewInfo, index) => ({ ...previewInfo, index }))
+      .sort((a, b) => a.port - b.port);
+
+    // close dropdown if user clicks outside
+    useEffect(() => {
+      const handleClickOutside = (event: MouseEvent) => {
+        if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
+          setIsDropdownOpen(false);
+        }
+      };
+
+      if (isDropdownOpen) {
+        window.addEventListener('mousedown', handleClickOutside);
+      } else {
+        window.removeEventListener('mousedown', handleClickOutside);
+      }
+
+      return () => {
+        window.removeEventListener('mousedown', handleClickOutside);
+      };
+    }, [isDropdownOpen]);
+
+    return (
+      <div className="relative z-port-dropdown" ref={dropdownRef}>
+        <IconButton icon="i-ph:plug" onClick={() => setIsDropdownOpen(!isDropdownOpen)} />
+        {isDropdownOpen && (
+          <div className="absolute right-0 mt-2 bg-bolt-elements-background-depth-2 border border-bolt-elements-borderColor rounded shadow-sm min-w-[140px] dropdown-animation">
+            <div className="px-4 py-2 border-b border-bolt-elements-borderColor text-sm font-semibold text-bolt-elements-textPrimary">
+              Ports
+            </div>
+            {sortedPreviews.map((preview) => (
+              <div
+                key={preview.port}
+                className="flex items-center px-4 py-2 cursor-pointer hover:bg-bolt-elements-item-backgroundActive"
+                onClick={() => {
+                  setActivePreviewIndex(preview.index);
+                  setIsDropdownOpen(false);
+                  setHasSelectedPreview(true);
+                }}
+              >
+                <span
+                  className={
+                    activePreviewIndex === preview.index
+                      ? 'text-bolt-elements-item-contentAccent'
+                      : 'text-bolt-elements-item-contentDefault group-hover:text-bolt-elements-item-contentActive'
+                  }
+                >
+                  {preview.port}
+                </span>
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+    );
+  },
+);

packages/bolt/app/components/workbench/Preview.tsx

@@ -2,11 +2,14 @@ import { useStore } from '@nanostores/react';
 import { memo, useCallback, useEffect, useRef, useState } from 'react';
 import { IconButton } from '~/components/ui/IconButton';
 import { workbenchStore } from '~/lib/stores/workbench';
+import { PortDropdown } from './PortDropdown';
 
 export const Preview = memo(() => {
   const iframeRef = useRef<HTMLIFrameElement>(null);
   const inputRef = useRef<HTMLInputElement>(null);
-  const [activePreviewIndex] = useState(0);
+  const [activePreviewIndex, setActivePreviewIndex] = useState(0);
+  const [isPortDropdownOpen, setIsPortDropdownOpen] = useState(false);
+  const hasSelectedPreview = useRef(false);
   const previews = useStore(workbenchStore.previews);
   const activePreview = previews[activePreviewIndex];
 
@@ -21,12 +24,10 @@ export const Preview = memo(() => {
       return;
     }
 
-    if (!iframeUrl) {
-      const { baseUrl } = activePreview;
+    const { baseUrl } = activePreview;
 
-      setUrl(baseUrl);
-      setIframeUrl(baseUrl);
-    }
+    setUrl(baseUrl);
+    setIframeUrl(baseUrl);
   }, [activePreview, iframeUrl]);
 
   const validateUrl = useCallback(
@@ -48,6 +49,22 @@ export const Preview = memo(() => {
     [activePreview],
   );
 
+  const findMinPortIndex = useCallback(
+    (minIndex: number, preview: { port: number }, index: number, array: { port: number }[]) => {
+      return preview.port < array[minIndex].port ? index : minIndex;
+    },
+    [],
+  );
+
+  // when previews change, display the lowest port if user hasn't selected a preview
+  useEffect(() => {
+    if (previews.length > 1 && !hasSelectedPreview.current) {
+      const minPortIndex = previews.reduce(findMinPortIndex, 0);
+
+      setActivePreviewIndex(minPortIndex);
+    }
+  }, [previews]);
+
   const reloadPreview = () => {
     if (iframeRef.current) {
       iframeRef.current.src = iframeRef.current.src;
@@ -56,6 +73,9 @@ export const Preview = memo(() => {
 
   return (
     <div className="w-full h-full flex flex-col">
+      {isPortDropdownOpen && (
+        <div className="z-iframe-overlay w-full h-full absolute" onClick={() => setIsPortDropdownOpen(false)} />
+      )}
       <div className="bg-bolt-elements-background-depth-2 p-2 flex items-center gap-1.5">
         <IconButton icon="i-ph:arrow-clockwise" onClick={reloadPreview} />
         <div
@@ -81,6 +101,16 @@ export const Preview = memo(() => {
             }}
           />
         </div>
+        {previews.length > 1 && (
+          <PortDropdown
+            activePreviewIndex={activePreviewIndex}
+            setActivePreviewIndex={setActivePreviewIndex}
+            isDropdownOpen={isPortDropdownOpen}
+            setHasSelectedPreview={(value) => (hasSelectedPreview.current = value)}
+            setIsDropdownOpen={setIsPortDropdownOpen}
+            previews={previews}
+          />
+        )}
       </div>
       <div className="flex-1 border-t border-bolt-elements-borderColor">
         {activePreview ? (

packages/bolt/app/styles/animations.scss

@@ -34,3 +34,16 @@
     transform: translate3d(100%, 0, 0);
   }
 }
+
+.dropdown-animation {
+  opacity: 0;
+  animation: fadeMoveDown 0.15s forwards;
+  animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+@keyframes fadeMoveDown {
+  to {
+    opacity: 1;
+    transform: translateY(6px);
+  }
+}

packages/bolt/app/styles/z-index.scss

@@ -8,6 +8,14 @@ $zIndexMax: 999;
   z-index: $zIndexMax - 2;
 }
 
+.z-port-dropdown {
+  z-index: $zIndexMax - 3;
+}
+
+.z-iframe-overlay {
+  z-index: $zIndexMax - 4;
+}
+
 .z-prompt {
   z-index: 2;
 }