ENH: Prefer dependency injection over use of new keyword. (#333)

* ENH: Prefer dependency injection over use of `new` keyword.

* MNT Fix phpcs linting error.

src/GridFieldAddExistingSearchHandler.php

@@ -96,7 +96,7 @@ class GridFieldAddExistingSearchHandler extends RequestHandler
     {
         $list = $this->context->getQuery($data, false, false, $this->getSearchList());
         $list = $list->subtract($this->grid->getList());
-        $list = new PaginatedList($list, $this->request);
+        $list = PaginatedList::create($list, $this->request);
 
         $data = $this->customise(array(
             'SearchForm' => $form,
@@ -109,7 +109,7 @@ class GridFieldAddExistingSearchHandler extends RequestHandler
     {
         $list = $this->getSearchList();
         $list = $list->subtract($this->grid->getList());
-        $list = new PaginatedList($list, $this->request);
+        $list = PaginatedList::create($list, $this->request);
 
         return $list;
     }

src/GridFieldAddNewInlineButton.php

@@ -102,7 +102,7 @@ class GridFieldAddNewInlineButton implements GridField_HTMLProvider, GridField_S
         Requirements::javascript('symbiote/silverstripe-gridfieldextensions:javascript/tmpl.js');
         GridFieldExtensions::include_requirements();
 
-        $data = new ArrayData(array(
+        $data = ArrayData::create(array(
             'Title'  => $this->getTitle(),
         ));
 
@@ -114,7 +114,7 @@ class GridFieldAddNewInlineButton implements GridField_HTMLProvider, GridField_S
 
     private function getRowTemplate(GridField $grid, GridFieldEditableColumns $editable)
     {
-        $columns = new ArrayList();
+        $columns = ArrayList::create();
         $handled = array_keys($editable->getDisplayFields($grid));
 
         if ($grid->getList()) {
@@ -161,7 +161,7 @@ class GridFieldAddNewInlineButton implements GridField_HTMLProvider, GridField_S
                 $attrs .= sprintf(' %s="%s"', $attr, Convert::raw2att($val));
             }
 
-            $columns->push(new ArrayData(array(
+            $columns->push(ArrayData::create(array(
                 'Content'    => $content,
                 'Attributes' => DBField::create_field('HTMLFragment', $attrs),
                 'IsActions'  => $column == 'Actions'

src/GridFieldAddNewMultiClass.php

@@ -244,13 +244,18 @@ class GridFieldAddNewMultiClass implements GridField_HTMLProvider, GridField_URL
 
         GridFieldExtensions::include_requirements();
 
-        $field = new DropdownField(sprintf('%s[%s]', __CLASS__, $grid->getName()), '', $classes, $this->defaultClass);
+        $field = DropdownField::create(
+            sprintf('%s[%s]', __CLASS__, $grid->getName()),
+            '',
+            $classes,
+            $this->defaultClass
+        );
         if (Config::inst()->get(__CLASS__, 'showEmptyString')) {
             $field->setEmptyString(_t('GridFieldExtensions.SELECTTYPETOCREATE', '(Select type to create)'));
         }
         $field->addExtraClass('no-change-track');
 
-        $data = new ArrayData(array(
+        $data = ArrayData::create(array(
             'Title'      => $this->getTitle(),
             'Link'       => Controller::join_links($grid->Link(), 'add-multi-class', '{class}'),
             'ClassField' => $field

src/GridFieldEditableColumns.php

@@ -83,7 +83,7 @@ class GridFieldEditableColumns extends GridFieldDataColumns implements
             // Fall back to previous logic
             if (!$field) {
                 $rel = (strpos($col, '.') === false); // field references a relation value
-                $field = ($rel) ? clone $fields->fieldByName($col) : new ReadonlyField($col);
+                $field = ($rel) ? clone $fields->fieldByName($col) : ReadonlyField::create($col);
             }
 
             if (!$field) {
@@ -211,7 +211,7 @@ class GridFieldEditableColumns extends GridFieldDataColumns implements
     public function getFields(GridField $grid, DataObjectInterface $record)
     {
         $cols   = $this->getDisplayFields($grid);
-        $fields = new FieldList();
+        $fields = FieldList::create();
 
         /** @var DataList $list */
         $list   = $grid->getList();
@@ -263,12 +263,12 @@ class GridFieldEditableColumns extends GridFieldDataColumns implements
                     if ($class && $obj = DataObject::singleton($class)->dbObject($colRelation[0])) {
                         $field = $obj->scaffoldFormField();
                     } else {
-                        $field = new ReadonlyField($colRelation[0]);
+                        $field = ReadonlyField::create($colRelation[0]);
                     }
                 } elseif ($class && $obj = DataObject::singleton($class)->dbObject($col)) {
                     $field = $obj->scaffoldFormField();
                 } else {
-                    $field = new ReadonlyField($col);
+                    $field = ReadonlyField::create($col);
                 }
             }
 
@@ -301,7 +301,7 @@ class GridFieldEditableColumns extends GridFieldDataColumns implements
     {
         $fields = $this->getFields($grid, $record);
 
-        $form = new Form($grid, null, $fields, new FieldList());
+        $form = Form::create($grid, null, $fields, FieldList::create());
         $form->loadDataFrom($record);
 
         $form->setFormAction(Controller::join_links(

src/GridFieldExternalLink.php

@@ -72,7 +72,7 @@ class GridFieldExternalLink extends GridFieldDataColumns
      */
     public function getColumnContent($gridField, $record, $columnName)
     {
-        $data = new ArrayData(array(
+        $data = ArrayData::create(array(
             'Link' => $record->hasMethod('getExternalLink') ? $record->getExternalLink() : $record->ExternalLink,
             'Text' => $record->hasMethod('getExternalLinkText') ? $record->getExternalLinkText() : 'External Link'
         ));

src/GridFieldRequestHandler.php

@@ -83,11 +83,11 @@ abstract class GridFieldRequestHandler extends RequestHandler
      */
     public function Form()
     {
-        $form = new Form(
+        $form = Form::create(
             $this,
             'SilverStripe\\Forms\\Form',
-            new FieldList($root = new TabSet('Root', new Tab('Main'))),
+            FieldList::create($root = TabSet::create('Root', Tab::create('Main'))),
-            new FieldList()
+            FieldList::create()
         );
 
         if ($this->getTopLevelController() instanceof LeftAndMain) {
@@ -136,7 +136,7 @@ abstract class GridFieldRequestHandler extends RequestHandler
         if ($controller->hasMethod('Breadcrumbs')) {
             return $controller->Breadcrumbs();
         } else {
-            return new ArrayList();
+            return ArrayList::create();
         }
     }
 

src/GridFieldTitleHeader.php

@@ -14,12 +14,12 @@ class GridFieldTitleHeader implements GridField_HTMLProvider
 
     public function getHTMLFragments($grid)
     {
-        $cols = new ArrayList();
+        $cols = ArrayList::create();
 
         foreach ($grid->getColumns() as $name) {
             $meta = $grid->getColumnMetadata($name);
 
-            $cols->push(new ArrayData(array(
+            $cols->push(ArrayData::create(array(
                 'Name'  => $name,
                 'Title' => $meta['title']
             )));