62 lines
1.6 KiB
PHP
62 lines
1.6 KiB
PHP
<?php
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namespace SilverStripe\Forms\GridField;
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use SilverStripe\Control\HTTP;
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use SilverStripe\Control\HTTPRequest;
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/**
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* Creates a unique key for the gridfield, and uses that to write to and retrieve
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* its state from the request
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*/
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class GridFieldStateManager implements GridFieldStateManagerInterface
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{
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/**
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* @param GridField $gridField
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* @return string
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*/
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public function getStateKey(GridField $gridField): string
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{
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$i = 0;
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$form = $gridField->getForm();
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if ($form) {
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$controller = $form->getController();
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while ($controller instanceof GridFieldDetailForm_ItemRequest) {
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$controller = $controller->getController();
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$i++;
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}
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}
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return sprintf('%s-%s-%s', 'gridState', $gridField->getName(), $i);
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}
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/**
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* @param GridField $gridField
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* @param string $url
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* @return string
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*/
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public function addStateToURL(GridField $gridField, string $url): string
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{
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$key = $this->getStateKey($gridField);
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$value = $gridField->getState(false)->Value();
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// Using a JSON-encoded empty array as the blank value, to avoid changing Value() semantics in a minor release
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if ($value === '{}') {
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return $url;
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}
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return HTTP::setGetVar($key, $value, $url);
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}
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/**
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* @param GridField $gridField
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* @param HTTPRequest $request
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* @return string|null
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*/
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public function getStateFromRequest(GridField $gridField, HTTPRequest $request): ?string
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{
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return $request->requestVar($this->getStateKey($gridField));
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}
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}
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