added component (#21)

Co-authored-by: Widle Studio LLP <widlestudiollp@Widles-Mac-mini.local>

Author: widlestudiollp

components/multi-file-viewer-uploader/README.md

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+# Multi File Viewer
+
+A Retool custom component for uploading and previewing multiple files, including images, PDFs, video, audio, text, JSON, CSV, and Excel files.
+
+## What `{{ multiFileViewer1 }}` returns
+
+When you reference the component directly in Retool:
+
+```js
+{{ multiFileViewer1 }}
+```
+
+it returns the component state object, which looks like this shape:
+
+```js
+{
+  pluginType: "DynamicWidget_MultiFileUploaderAndViewer_MultiFileViewer",
+  heightType: "auto",
+  files: [],
+  selectedFile: {
+    id: "",
+    name: "",
+    url: "",
+    previewUrl: "",
+    mimeType: "",
+    label: "",
+    kind: "unknown"
+  },
+  acceptedKind: "",
+  collectionUuid: "...",
+  allowMixedFileTypes: true,
+  id: "multiFileViewer1"
+}
+```
+
+Depending on uploads and selection, `files` and `selectedFile` will contain real values.
+
+## Recommended Retool usage
+
+### Get the full component object
+
+```js
+{{ multiFileViewer1 }}
+```
+
+### Get all uploaded files
+
+```js
+{{ multiFileViewer1.files }}
+```
+
+### Get the currently selected file
+
+```js
+{{ multiFileViewer1.selectedFile }}
+```
+
+### Get the selected file name
+
+```js
+{{ multiFileViewer1.selectedFile.name }}
+```
+
+### Get the selected file MIME type
+
+```js
+{{ multiFileViewer1.selectedFile.mimeType }}
+```
+
+### Get the selected file preview URL
+
+```js
+{{ multiFileViewer1.selectedFile.previewUrl }}
+```
+
+### Get the selected file kind
+
+```js
+{{ multiFileViewer1.selectedFile.kind }}
+```
+
+### Check whether mixed file types are enabled
+
+```js
+{{ multiFileViewer1.allowMixedFileTypes }}
+```
+
+### Get the accepted upload kind for single-type mode
+
+```js
+{{ multiFileViewer1.acceptedKind }}
+```
+
+## File object structure
+
+Each item inside `multiFileViewer1.files` follows this shape:
+
+```js
+{
+  id: "file-id",
+  name: "example.pdf",
+  url: "blob:...",
+  previewUrl: "blob:...",
+  mimeType: "application/pdf",
+  label: "PDF",
+  kind: "pdf",
+  objectUrl: "blob:...",
+  base64: "..."
+}
+```
+
+## Selected file object structure
+
+`multiFileViewer1.selectedFile` follows this shape:
+
+```js
+{
+  id: "file-id",
+  name: "example.pdf",
+  url: "blob:...",
+  previewUrl: "blob:...",
+  mimeType: "application/pdf",
+  label: "PDF",
+  kind: "pdf"
+}
+```
+
+## Common examples
+
+### Send the selected file to a query
+
+```js
+{{
+  {
+    name: multiFileViewer1.selectedFile.name,
+    type: multiFileViewer1.selectedFile.mimeType,
+    kind: multiFileViewer1.selectedFile.kind,
+    previewUrl: multiFileViewer1.selectedFile.previewUrl
+  }
+}}
+```
+
+### Send all files to a query
+
+```js
+{{ multiFileViewer1.files }}
+```
+
+### Get only file names
+
+```js
+{{ multiFileViewer1.files.map(file => file.name) }}
+```
+
+### Get only base64 values
+
+```js
+{{ multiFileViewer1.files.map(file => file.base64) }}
+```
+
+### Get the first uploaded file
+
+```js
+{{ multiFileViewer1.files[0] }}
+```
+
+## Notes
+
+- `files` is an array of uploaded files.
+- `selectedFile` is the file currently chosen in the sidebar.
+- `acceptedKind` is used when mixed file uploads are turned off.
+- `allowMixedFileTypes` is the checkbox-controlled setting for mixed uploads.
+- `heightType: "auto"` means the component is configured to work with auto height in Retool.
+- `previewUrl` and `url` are usually blob URLs for local uploaded files.
+
+## Best practice
+
+In most Retool queries and transformers, use nested access instead of the whole object when possible.
+
+Good:
+
+```js
+{{ multiFileViewer1.selectedFile }}
+{{ multiFileViewer1.files }}
+{{ multiFileViewer1.allowMixedFileTypes }}
+```
+
+Less useful on its own:
+
+```js
+{{ multiFileViewer1 }}
+```
+
+because that returns the entire component state wrapper, not just the selected file.

components/multi-file-viewer-uploader/cover.png

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+{
+  "id": "multi-file-viewer",
+  "title": "Multi File Viewer",
+  "author": "@widlestudiollp",
+  "shortDescription": "A responsive Retool custom component for uploading and previewing images, PDFs, spreadsheets, CSV, text, JSON, audio, video, and office files.",
+  "tags": [
+    "File Upload",
+    "File Preview",
+    "Retool",
+    "PDF",
+    "Spreadsheets",
+    "Media Viewer"
+  ]
+}

components/multi-file-viewer-uploader/metadata.json

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+{
+    "name": "my-react-app",
+    "version": "0.1.0",
+    "private": true,
+    "dependencies": {
+        "@tryretool/custom-component-support": "latest",
+        "react": "^18.2.0",
+        "react-dom": "^18.2.0",
+        "xlsx": "^0.18.5"
+    },
+    "engines": {
+        "node": ">=20.0.0"
+    },
+    "scripts": {
+        "dev": "npx retool-ccl dev",
+        "deploy": "npx retool-ccl deploy",
+        "test": "vitest"
+    },
+    "browserslist": {
+        "production": [
+            ">0.2%",
+            "not dead",
+            "not op_mini all"
+        ],
+        "development": [
+            "last 1 chrome version",
+            "last 1 firefox version",
+            "last 1 safari version"
+        ]
+    },
+    "devDependencies": {
+        "@types/react": "^18.2.55",
+        "@typescript-eslint/eslint-plugin": "^7.3.1",
+        "@typescript-eslint/parser": "^7.3.1",
+        "eslint": "^8.57.0",
+        "eslint-plugin-react": "^7.34.1",
+        "postcss-modules": "^6.0.0",
+        "prettier": "^3.0.3",
+        "vitest": "^4.0.17"
+    },
+    "retoolCustomComponentLibraryConfig": {
+        "name": "MultileFileUploaderAndViewer",
+        "label": "Multile file uploader and viewer",
+        "description": "We can view multiple files that we uploaded",
+        "entryPoint": "src/index.tsx",
+        "outputPath": "dist"
+    }
+}