Change UploadField to TreeDropdownField for modal fields

Change UploadField to abstract placeholder FileHandleField for non-modal fields

_config/asset.yml

@@ -66,3 +66,9 @@ SilverStripe\Core\Injector\Injector:
   SilverStripe\Assets\Image_Backend:
     class: SilverStripe\Assets\GDBackend
   Image_Backend: '%$SilverStripe\Assets\Image_Backend'
+---
+Name: coreassetfield
+---
+SilverStripe\Core\Injector\Injector:
+  SilverStripe\Forms\FileHandleField:
+    class: SilverStripe\Forms\FileField

admin/client/dist/js/bundle.js

@@ -1,7 +1,7 @@
 webpackJsonp([4],[function(e,t,n){"use strict"
 n(2),n(3),n(6),n(16),n(18),n(24),n(26),n(28),n(29),n(31),n(34),n(104),n(112),n(116),n(126),n(127),n(128),n(129),n(130),n(131),n(133),n(136),n(138),n(140),n(143),n(146),n(148),n(150),n(152),n(154),n(156),
-n(157),n(166),n(167),n(169),n(170),n(171),n(172),n(173),n(174),n(175),n(176),n(177),n(178),n(179),n(180),n(181),n(184),n(186),n(187),n(188),n(189),n(193),n(194),n(195),n(196),n(197),n(194),n(189),n(200),
+n(157),n(166),n(167),n(169),n(170),n(171),n(172),n(173),n(174),n(175),n(176),n(177),n(178),n(179),n(180),n(181),n(184),n(186),n(187),n(188),n(189),n(193),n(194),n(195),n(196),n(197),n(194),n(200),n(202),
-n(202),n(204),n(205)},,function(e,t){"use strict"
+n(204),n(205)},,function(e,t){"use strict"
 function n(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(t,"__esModule",{value:!0})
 var i=function(){function e(e,t){for(var n=0;n<t.length;n++){var i=t[n]
 i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}return function(t,n,i){return n&&e(t.prototype,n),i&&e(t,i),t}}(),r=function(){function e(){

admin/client/src/bundles/bundle.js

@@ -65,7 +65,6 @@ require('../legacy/ToggleCompositeField.js');
 require('../legacy/MemberDatetimeOptionsetField.js');
 require('../legacy/TreeDropdownField.js');
 require('../legacy/DateField.js');
-require('../legacy/UploadField.js');
 require('../legacy/HtmlEditorField.js');
 require('../legacy/TabSet.js');
 require('../legacy/GridField.js');

src/Forms/FileField.php

@@ -46,7 +46,7 @@ use SilverStripe\Core\Object;
  * }
  * </code>
  */
-class FileField extends FormField
+class FileField extends FormField implements FileHandleField
 {
     use UploadReceiver;
 

src/Forms/FileHandleField.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace SilverStripe\Forms;
+
+interface FileHandleField
+{
+    public function getAttributes();
+    
+    public function getFolderName();
+    
+    public function setAllowedExtensions($rules);
+    
+    public function getAllowedExtensions();
+    
+    public function setAllowedFileCategories($category);
+    
+    public function setFolderName($folderName);
+}

src/Forms/HTMLEditor/HTMLEditorField_Toolbar.php

@@ -10,10 +10,12 @@ use SilverStripe\Control\Director;
 use SilverStripe\Control\RequestHandler;
 use SilverStripe\Control\HTTPRequest;
 use SilverStripe\Control\HTTPResponse_Exception;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Forms\CheckboxField;
 use SilverStripe\Forms\CompositeField;
 use SilverStripe\Forms\EmailField;
 use SilverStripe\Forms\FieldList;
+use SilverStripe\Forms\FileHandleField;
 use SilverStripe\Forms\Form;
 use SilverStripe\Forms\GridField\GridField;
 use SilverStripe\Forms\GridField\GridFieldConfig;
@@ -122,6 +124,7 @@ class HTMLEditorField_Toolbar extends RequestHandler
 
         $numericLabelTmpl = '<span class="step-label"><span class="flyout">Step %d.</span>'
             . '<span class="title">%s</span></span>';
+        
         $form = new Form(
             $this->controller,
             "{$this->name}/LinkForm",
@@ -159,7 +162,10 @@ class HTMLEditorField_Toolbar extends RequestHandler
                     $siteTree,
                     TextField::create('external', _t('HTMLEditorField.URL', 'URL'), 'http://'),
                     EmailField::create('email', _t('HTMLEditorField.EMAIL', 'Email address')),
-                    $fileField = UploadField::create('file', _t('HTMLEditorField.FILE', 'File')),
+                    $fileField = TreeDropdownField::create(
+                        'file',
+                        _t('HTMLEditorField.FILE', 'File'),
+                        File::class),
                     TextField::create('Anchor', _t('HTMLEditorField.ANCHORVALUE', 'Anchor')),
                     TextField::create('Subject', _t('HTMLEditorField.SUBJECT', 'Email subject')),
                     TextField::create('Description', _t('HTMLEditorField.LINKDESCR', 'Link description')),
@@ -177,7 +183,6 @@ class HTMLEditorField_Toolbar extends RequestHandler
         $headerWrap->addExtraClass('CompositeField composite cms-content-header form-group--no-label ');
         $contentComposite->setName('ContentBody');
         $contentComposite->addExtraClass('ss-insert-link content');
-        $fileField->setAllowedMaxFileNumber(1);
 
         $form->unsetValidator();
         $form->loadDataFrom($this);

src/ORM/FieldType/DBForeignKey.php

@@ -4,8 +4,9 @@ namespace SilverStripe\ORM\FieldType;
 
 use SilverStripe\Assets\File;
 use SilverStripe\Assets\Image;
-use SilverStripe\Forms\UploadField;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Forms\DropdownField;
+use SilverStripe\Forms\FileHandleField;
 use SilverStripe\Forms\NumericField;
 use SilverStripe\ORM\DataList;
 use SilverStripe\ORM\DataObject;
@@ -48,7 +49,7 @@ class DBForeignKey extends DBInt
         }
         $hasOneSingleton = singleton($hasOneClass);
         if ($hasOneSingleton instanceof File) {
-            $field = new UploadField($relationName, $title);
+            $field = Injector::inst()->create(FileHandleField::class, $relationName, $title);
             if ($hasOneSingleton instanceof Image) {
                 $field->setAllowedFileCategories('image/supported');
             }