Make FileUpload data and metadata private

Author: jtpio

ipywidgets/widgets/widget_upload.py

@@ -35,6 +35,10 @@ class FileUpload(DescriptionWidget, ValueWidget, CoreWidget):
     _view_name = Unicode('FileUploadView').tag(sync=True)
     _counter = Int(read_only=True).tag(sync=True)
     _file_count = Int().tag(sync=True)
+    _metadata = List(Dict(), read_only=True, help='List of file metadata').tag(sync=True)
+    _data = List(Bytes(), read_only=True, help='List of file content (bytes)').tag(
+        sync=True, from_json=content_from_json
+    )
 
     accept = Unicode(help='File types to accept, empty string for all').tag(sync=True)
     multiple = Bool(help='If True, allow for multiple files upload').tag(sync=True)
@@ -44,19 +48,15 @@ class FileUpload(DescriptionWidget, ValueWidget, CoreWidget):
         values=['primary', 'success', 'info', 'warning', 'danger', ''], default_value='',
         help="""Use a predefined styling for the button.""").tag(sync=True)
     style = InstanceDict(ButtonStyle).tag(sync=True, **widget_serialization)
-    metadata = List(Dict(), read_only=True, help='List of file metadata').tag(sync=True)
-    data = List(Bytes(), read_only=True, help='List of file content (bytes)').tag(
-        sync=True, from_json=content_from_json
-    )
     error = Unicode(help='Error message').tag(sync=True)
     value = Dict(read_only=True)
 
     @observe('_counter')
     def on_incr_counter(self, change):
         res = {}
         msg = 'Error: length of metadata and data must be equal'
-        assert len(self.metadata) == len(self.data), msg
-        for metadata, content in zip(self.metadata, self.data):
+        assert len(self._metadata) == len(self._data), msg
+        for metadata, content in zip(self._metadata, self._data):
             name = metadata['name']
             res[name] = {'metadata': metadata, 'content': content}
         self.set_trait('value', res)

packages/controls/src/widget_upload.ts

@@ -14,23 +14,23 @@ export class FileUploadModel extends CoreDOMWidgetModel {
 
             _counter: 0,
             _file_count: 0,
+            _data: [],
+            _metadata: [],
             accept: '',
             description: 'Upload',
             tooltip: '',
             disabled: false,
             icon: 'upload',
             button_style: '',
             multiple: false,
-            metadata: [],
-            data: [],
             error: '',
             style: null
         });
     }
 
     static serializers = {
         ...CoreDOMWidgetModel.serializers,
-        data: { serialize: (buffers: any) => { return [...buffers]; } },
+        _data: { serialize: (buffers: any) => { return [...buffers]; } },
     };
 }
 
@@ -107,8 +107,8 @@ export class FileUploadView extends DOMWidgetView {
                     this.model.set({
                         _counter: counter + contents.length,
                         _file_count: contents.length,
-                        metadata,
-                        data: li_buffer,
+                        _metadata: metadata,
+                        _data: li_buffer,
                         error: '',
                     });
                     this.touch();

packages/schema/jupyterwidgetmodels.latest.md

@@ -374,8 +374,10 @@ Attribute        | Type             | Default          | Help
 Attribute        | Type             | Default          | Help
 -----------------|------------------|------------------|----
 `_counter`       | number (integer) | `0`              | 
+`_data`          | array            | `[]`             | List of file content (bytes)
 `_dom_classes`   | array of string  | `[]`             | CSS classes applied to widget DOM element
 `_file_count`    | number (integer) | `0`              | 
+`_metadata`      | array            | `[]`             | List of file metadata
 `_model_module`  | string           | `'@jupyter-widgets/controls'` | 
 `_model_module_version` | string           | `'1.5.0'`        | 
 `_model_name`    | string           | `'FileUploadModel'` | 
@@ -384,14 +386,12 @@ Attribute        | Type             | Default          | Help
 `_view_name`     | string           | `'FileUploadView'` | 
 `accept`         | string           | `''`             | File types to accept, empty string for all
 `button_style`   | string (one of `'primary'`, `'success'`, `'info'`, `'warning'`, `'danger'`, `''`) | `''`             | Use a predefined styling for the button.
-`data`           | array            | `[]`             | List of file content (bytes)
 `description`    | string           | `''`             | Description of the control.
 `description_tooltip` | `null` or string | `null`           | Tooltip for the description (defaults to description).
 `disabled`       | boolean          | `false`          | Enable or disable button
 `error`          | string           | `''`             | Error message
 `icon`           | string           | `'upload'`       | Font-awesome icon name, without the 'fa-' prefix.
 `layout`         | reference to Layout widget | reference to new instance | 
-`metadata`       | array            | `[]`             | List of file metadata
 `multiple`       | boolean          | `false`          | If True, allow for multiple files upload
 `style`          | reference to ButtonStyle widget | reference to new instance |