GY_zhishiku_admin/app/Admin/Controllers/CategoryController.php

<?php
namespace App\Admin\Controllers;

use App\Http\Controllers\Controller;
use App\Model\Category;
use Encore\Admin\Form;
use Encore\Admin\Grid;
use Encore\Admin\Facades\Admin;
use Encore\Admin\Layout\Content;
use Encore\Admin\Controllers\ModelForm;



class CategoryController extends Controller
{
    use ModelForm;
    public function index()
    {
//        return Admin::content(function (Content $content) {
//            $content->header('类目');
//            $content->description('列表');
//            $content->body($this->grid());
//        });

        return Admin::content(function (Content $content) {
            $content->header('脑图列表');
            $content->body(Category::tree(function ($tree) {
                $tree->branch(function ($branch) {
                    return "{$branch['id']} - {$branch['category_name']}";
                });
            }));
        });
    }

    public function create()
    {
        return Admin::content(function (Content $content) {
            $content->header('脑图');
            $content->description('新增');
            $content->body($this->form());
        });
    }

    public function edit($id)
    {
        return Admin::content(function (Content $content) use ($id) {
            $content->header('脑图');
            $content->description();
            $content->body($this->form($id)->edit($id));
        });
    }


    protected function form($id = '')
    {
        return Admin::form(Category::class, function (Form $form) {
            $form->display('id' , '编号');
            $form->text('category_name' , '分类名称');
            $form->select('parent_id'   ,  '选择分类')->options(Category::getCategory());
            $form->select('type'        ,  '选择类型')->options([1 => '脑图中文' , 2 => '脑图英文']);
            $form->saving(function (Form $form) {
                if(is_null($form->parent_id)) {
                    $form->parent_id = 0;
                }
            });
        });
    }


    // Grid
    protected function grid()
    {
        return Admin::grid(Category::class, function (Grid $grid) {
            $grid->id('编号')->sortable();
            //$grid->model()->orderBy('id','desc');
            $grid->category_name('类目名称');
            $grid->parent_id('父级名称')->display(function ($parent_id) {
                return $parent_id ? Category::getCategoryName($parent_id): '---';
            });
            $grid->paginate(20);

            // 禁用导出数据按钮
            $grid->actions(function ($actions) {
                $actions->disableView();
                //$actions->disableEdit();
                $actions->disableDelete();
            });

            //$grid->disableCreateButton();
            $grid->disableExport();

            $grid->filter(function ($filter) {
                $filter->disableIdFilter();
            });
        });
    }
}