php - 具有多个注入类实例的 DI

Question

我正在使用Imagine库进行一些图像实时编辑，并且正在碰壁了解如何解耦我可能需要动态构建多个实例的类。

人为的例子

namespace App;

use Imagine\Image\{ Point, ImagineInterface };
use Imagine\Image\Palette\PaletteInterface;

class Image 
{
    protected $imagine;
    protected $palette;

    public function __construct(ImagineInterface $imagine, PaletteInterface $palette)
    {
        $this->imagine = $imagine;
        $this->palette = $palette;
    }

    public function buildImage($args)
    {
        $image = $this->imagine->open('some/file/path');
        $font = $this->imagine->font('some/font/path', 20, $this->palette->color('#000'));

        /* how to inject these when x/y are dynamically set? */
        $point1 = new Point($args['x1'], $args['y1']);
        $point2 = new Point($args['x2'], $args['y2']);

        $image->draw()->text('example one', $font, $point1);
        $image->draw()->text('example one', $font, $point2);
    }
}

标签： phpdependency-injectionphp-imagine

Answer 1

我不确定这是这里最好的答案，但没有人插话，所以我会接受它。我创建了一个工厂类，该类注入到图像类中，该类接受参数并返回 Imagine Point 类的新实例，如下所示：

工厂

namespace App\Image;

use Imagine\Image\Point;

class PointFactory
{
    public function create($x, $y)
    {
        return new Point($x, $y);
    }
}

图片

namespace App;

use Imagine\Image\ImagineInterface;
use Imagine\Image\Palette\PaletteInterface;
use App\Image\PointFactory;

class Image 
{
    protected $imagine;
    protected $palette;

    public function __construct(ImagineInterface $imagine, PaletteInterface $palette, PointFactory $point)
    {
        $this->imagine = $imagine;
        $this->palette = $palette;
        $this->pointFactory = $point;
    }

    public function buildImage($args)
    {
        $image = $this->imagine->open('some/file/path');
        $font = $this->imagine->font('some/font/path', 20, $this->palette->color('#000'));

        /* how to inject these when x/y are dynamically set? */
        $point1 = $this->pointFactory->create($args['x1'], $args['y1']);
        $point2 = $this->pointFactory->create($args['x2'], $args['y2']);

        $image->draw()->text('example one', $font, $point1);
        $image->draw()->text('example one', $font, $point2);
    }
}

现在为了测试，我创建了一个工厂的模拟并将其传入。