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<?php
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namespace PhpOffice\PhpSpreadsheet\Shared\Escher\DgContainer;
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class SpgrContainer
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{
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    /**
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     * Parent Shape Group Container.
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     */
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    private ?self $parent = null;
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    /**
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     * Shape Container collection.
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     */
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    private array $children = [];
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    /**
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     * Set parent Shape Group Container.
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     */
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    public function setParent(?self $parent): void
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    {
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        $this->parent = $parent;
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    }
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    /**
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     * Get the parent Shape Group Container if any.
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     */
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    public function getParent(): ?self
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    {
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        return $this->parent;
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    }
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    /**
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     * Add a child. This will be either spgrContainer or spContainer.
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     *
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     * @param SpgrContainer|SpgrContainer\SpContainer $child child to be added
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     */
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    public function addChild(mixed $child): void
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    {
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        $this->children[] = $child;
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        $child->setParent($this);
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    }
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    /**
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     * Get collection of Shape Containers.
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     */
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    public function getChildren(): array
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    {
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        return $this->children;
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    }
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    /**
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     * Recursively get all spContainers within this spgrContainer.
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     *
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     * @return SpgrContainer\SpContainer[]
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     */
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    public function getAllSpContainers(): array
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    {
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        $allSpContainers = [];
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        foreach ($this->children as $child) {
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            if ($child instanceof self) {
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                $allSpContainers = array_merge($allSpContainers, $child->getAllSpContainers());
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            } else {
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                $allSpContainers[] = $child;
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            }
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        }
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        return $allSpContainers;
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    }
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}