update code

app/Exports/BaseDocumentsExport.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace App\Exports;
+
+use Maatwebsite\Excel\Concerns\FromCollection;
+use Maatwebsite\Excel\Concerns\WithHeadings;
+use Maatwebsite\Excel\Concerns\WithMapping;
+use PhpOffice\PhpSpreadsheet\Shared\Date;
+use Maatwebsite\Excel\Concerns\ShouldAutoSize;
+use Maatwebsite\Excel\Concerns\WithColumnFormatting;
+use PhpOffice\PhpSpreadsheet\Style\Color;
+use PhpOffice\PhpSpreadsheet\Style\Conditional;
+use Maatwebsite\Excel\Concerns\WithTitle;
+use Maatwebsite\Excel\Concerns\WithCustomStartCell;
+use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
+use Maatwebsite\Excel\Concerns\WithPreCalculateFormulas;
+use Maatwebsite\Excel\Concerns\WithEvents;
+use Maatwebsite\Excel\Events\BeforeExport;
+use Maatwebsite\Excel\Events\BeforeWriting;
+use Maatwebsite\Excel\Events\BeforeSheet;
+use Maatwebsite\Excel\Events\AfterSheet;
+
+abstract class BaseDocumentsExport 
+implements 
+    FromCollection, 
+    WithHeadings, 
+    WithMapping, 
+    ShouldAutoSize, 
+    WithTitle,
+    WithCustomStartCell,
+    WithColumnFormatting,
+    WithPreCalculateFormulas,
+    WithEvents
+{
+    protected $documents;
+    protected $title;
+    protected $from;
+    protected $to;
+
+    public function __construct($documents, string $title, $from = null, $to = null){
+        $this->documents = $documents;
+        $this->title = $title;
+        $this->from = $from;
+        $this->to = $to;
+    }
+
+    /**
+    * @return \Illuminate\Support\Collection
+    */
+    public function collection()
+    {
+        return $this->documents;
+    }
+
+    abstract public function headings(): array;
+
+    abstract public function map($document): array;
+
+    public function title(): string
+    {
+        return $this->title;
+    }
+
+    public function startCell(): string
+    {
+        return 'A1';
+    }
+
+    public function columnFormats(): array
+    {
+        return [
+            'A' => NumberFormat::FORMAT_DATE_DDMMYYYY,
+        ];
+    }
+
+    public function registerEvents(): array
+    {
+        return [
+            AfterSheet::class => [self::class, 'afterSheet'],
+        ];
+    }
+
+    public static function afterSheet(AfterSheet $event) 
+    {
+        // $event->getSheet()->getDelegate()->setCellValue('A10', 'xxx');
+
+        // $style = new Color(Color::COLOR_RED);!
+        // $event->getSheet()->getDelegate()->setConditionalStyles('A10', $style);!
+    }
+
+}