decouple DataSource

README.md

@@ -93,13 +93,20 @@ protected function grid()
     // set write type, default xlsx
     $exporter->setWriteType(\Maatwebsite\Excel\Excel::CSV);
 
+    // set the file name
+    $exporter->setFileName('test-export');
+
     $grid->exporter($exporter);
 
     return $grid;
 }
 
 ...
 ```
+if you want more control over the output file, you can create a class that extents from `Chenyulingxi\LaravelAdmin\GridExporter`, then inject it's instance to the exporter like this:
+```php
+$exporter->setDataSource(new TestDataSource());
+```
 more information reference to [Laravel Excel](https://docs.laravel-excel.com/3.1/exports/extending.html) and [PhpSpreadsheet](https://phpspreadsheet.readthedocs.io/en/latest/topics/recipes/#styles)
 
 License

src/DataSource.php

@@ -48,7 +48,7 @@ public function headings(): array
         return $this->headings;
     }
 
-    private function getDefaultEvents(): array
+    protected function getDefaultEvents(): array
     {
         return [
             AfterSheet::class => function (AfterSheet $event) {

src/Exporter.php

@@ -21,6 +21,8 @@ class Exporter extends AbstractExporter
 
     protected $events = [];
 
+    protected $dataSource;
+
     public function format($name, $handler)
     {
         $this->columnFormatters[$name] = $handler;
@@ -41,6 +43,11 @@ public function setEvents(array $events)
         $this->events = $events;
     }
 
+    public function setDataSource(DataSource $dataSource)
+    {
+        $this->dataSource = $dataSource;
+    }
+
     public function withHeadings($headings)
     {
         if (is_bool($headings)) {
@@ -100,7 +107,11 @@ public function export()
             $columns = $this->grid->columns();
         }
         $headings = $this->getHeadings($columns);
-        $dataSource = new DataSource();
+        if ($this->dataSource instanceof DataSource) {
+            $dataSource = $this->dataSource;
+        } else {
+            $dataSource = new DataSource();
+        }
         $dataSource->setHeadings(array_values($headings));
         $dataSource->setEvents($this->events);