lianjie_admin/app/Admin/Controllers/v3/CategoryController.php

<?php

namespace App\Admin\Controllers\v3;

use App\Admin\Actions\Tree\CategoryTie;
use App\Models\v3\Category;
use Dcat\Admin\Form;
use Dcat\Admin\Layout\Row;
use Dcat\Admin\Layout\Content;
use Dcat\Admin\Tree;
use Dcat\Admin\Controllers\AdminController;
use Dcat\Admin\Show;
use Dcat\Admin\Widgets\Card;
use App\Admin\Forms\CategoryTieForm;

class CategoryController extends AdminController
{
    public function index(Content $content)
    {
        return $content->header('分类')
            ->body(function (Row $row) {
                $tree = new Tree(new Category);

                $tree->branch(function ($branch) {
                    // 查询分类ssdb

                    $src = $branch['cover_img_url'];
                    $logo = "<img src='$src' style='margin-left: 20px; max-width:35px;max-height:35px' class='img'/>";

                    $actions = '';
                    $actions = ($branch['parent_id'] == 0) ?'<a href="/admin/category/'.$branch['id'].'/tie" style="margin-left: 20px;">已绑定</a>':$actions;
                    
                    return "{$branch['id']} - {$branch['title']}  $logo  $actions";
                });
                $tree->tools(function (Tree\Tools $tools) {
                    $tools->add(new CategoryTie());
                });

                $row->column(12, $tree);
            });
    }

    public function form()
    {
        return Form::make(new Category(),function (Form $form){
           
            // 只查一级
            $parentList = Category::getCategoryArray([['parent_id','=',0]],[0=>'顶级']);

            $form->select('parent_id')->default(0)->options($parentList);
            $form->text('title');
            $form->image('cover_img');
            
            $form->number('sort');

            $form->disableResetButton();
            $form->disableViewCheck();
            $form->disableEditingCheck();
            $form->disableCreatingCheck();
        });
    }

    public function CategoryTieForm(Content $content)
    {

        return $content
            ->title('绑定分类到首页')
            ->body(new Card(new CategoryTieForm()), function (Form $form) {
            });
    }

    /**
     * Make a show builder.
     *
     * @param mixed $id
     *
     * @return Show
     */
    protected function detail($id)
    {
        return Show::make($id, new Category(), function (Show $show) {

            $show->field('parent_id');
            $show->field('title');
            $show->field('cover_img')->image();
            $show->field('sort');
            $show->field('status');
        });
    }
}