[WIP][FEATURE] Link builder with demand selection

Classes/LinkHandler/DemandLinkHandler.php

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+<?php
+
+declare(strict_types=1);
+
+
+namespace Pixelant\Demander\LinkHandler;
+
+
+use Pixelant\PxaProductManager\Backend\Tree\BrowserTreeView;
+use Psr\Http\Message\ServerRequestInterface;
+use TYPO3\CMS\Core\Page\PageRenderer;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Fluid\View\StandaloneView;
+use TYPO3\CMS\Recordlist\Controller\AbstractLinkBrowserController;
+use TYPO3\CMS\Recordlist\LinkHandler\AbstractLinkHandler;
+use TYPO3\CMS\Recordlist\LinkHandler\LinkHandlerInterface;
+use TYPO3\CMS\Recordlist\Tree\View\LinkParameterProviderInterface;
+
+/**
+ * Link handler for page links with preset demand
+ */
+class DemandLinkHandler implements
+    LinkHandlerInterface,
+    LinkParameterProviderInterface
+{
+    /**
+     * Available additional link attributes
+     *
+     * 'rel' only works in RTE, still we have to declare support for it.
+     *
+     * @var string[]
+     */
+    protected $linkAttributes = ['target', 'title', 'class', 'params', 'rel'];
+
+    /**
+     * @var \TYPO3\CMS\Fluid\View\StandaloneView
+     */
+    protected $view;
+
+    /**
+     * @var int
+     */
+    protected int $expandPage = 0;
+
+    /**
+     * @var int
+     */
+    protected int $pid = 0;
+
+    /**
+     * @inheritDoc
+     */
+    public function getLinkAttributes()
+    {
+        return $this->linkAttributes;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function modifyLinkAttributes(array $fieldDefinitions)
+    {
+        return $fieldDefinitions;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function initialize(AbstractLinkBrowserController $linkBrowser, $identifier, array $configuration)
+    {
+        $this->linkBrowser = $linkBrowser;
+        $this->view = GeneralUtility::makeInstance(StandaloneView::class);
+        $this->view->getRequest()->setControllerExtensionName('recordlist');
+        $this->view->setTemplateRootPaths([GeneralUtility::getFileAbsFileName('EXT:demander/Resources/Private/Templates/LinkBrowser')]);
+        $this->view->setPartialRootPaths([GeneralUtility::getFileAbsFileName('EXT:demander/Resources/Private/Partials/LinkBrowser')]);
+        $this->view->setLayoutRootPaths([GeneralUtility::getFileAbsFileName('EXT:demander/Resources/Private/Layouts/LinkBrowser')]);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function canHandleLink(array $linkParts)
+    {
+        var_dump($linkParts);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function formatCurrentUrl()
+    {
+        return 'demand:123?d[tablename-fieldname]=1-3';
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function render(ServerRequestInterface $request)
+    {
+        $this->expandPage = (int)($request->getQueryParams()['expandPage'] ?? 0);
+
+        GeneralUtility::makeInstance(PageRenderer::class)
+            ->loadRequireJsModule('TYPO3/CMS/Demander/DemandLinkHandler');
+
+        $tsConfig = $this->getBackendUser()->getTSConfig();
+
+        /** @var BrowserTreeView $pageTree */
+        $pageTree = GeneralUtility::makeInstance(BrowserTreeView::class);
+        $pageTree->setLinkParameterProvider($this);
+        $pageTree->ext_showNavTitle = (bool)($tsConfig['options.']['pageTree.']['showNavTitle'] ?? false);
+        $pageTree->ext_showPageId = (bool)($tsConfig['options.']['pageTree.']['showPageIdWithTitle'] ?? false);
+        $pageTree->ext_showPathAboveMounts = (bool)($tsConfig['options.']['pageTree.']['showPathAboveMounts'] ?? false);
+        $pageTree->addField('nav_title');
+
+        $this->view->assignMultiple([
+            'expandActivePage' => $this->expandPage > 0, // TODO: Limit to pages on sites
+            'tree' => $pageTree->getBrowsableTree()
+        ]);
+
+        return $this->view->render('DemandLinkHandler');
+    }
+
+    /**
+     * @param array $values Values to be checked
+     *
+     * @return bool Returns TRUE if the given values match the currently selected item
+     */
+    public function isCurrentlySelectedItem(array $values): bool
+    {
+        $compareToPid = $this->expandPage ?: $this->pid;
+
+        return $compareToPid === (int)$values['pid'];
+    }
+
+    /**
+     * Returns the URL of the current script.
+     *
+     * @return string
+     */
+    public function getScriptUrl(): string
+    {
+        return $this->linkBrowser->getScriptUrl();
+    }
+
+    /**
+     * @param array $values Array of values to include into the parameters or which might influence the parameters
+     *
+     * @return string[] Array of parameters which have to be added to URLs
+     */
+    public function getUrlParameters(array $values): array
+    {
+        $parameters = [
+            'expandPage' => isset($values['pid']) ? (int)$values['pid'] : $this->expandPage,
+        ];
+
+        return array_merge($this->linkBrowser->getUrlParameters($values), $parameters);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function isUpdateSupported()
+    {
+        return false;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getBodyTagAttributes()
+    {
+        return [];
+    }
+
+    /**
+     * Sets a DB mount and stores it in the currently defined backend user in her/his uc
+     */
+    protected function setTemporaryDbMounts()
+    {
+        $backendUser = $this->getBackendUser();
+
+        // Clear temporary DB mounts
+        $tmpMount = GeneralUtility::_GET('setTempDBmount');
+        if (isset($tmpMount)) {
+            $backendUser->setAndSaveSessionData('pageTree_temporaryMountPoint', (int)$tmpMount);
+        }
+
+        $backendUser->initializeWebmountsForElementBrowser();
+    }
+
+    /**
+     * @return BackendUserAuthentication
+     */
+    protected function getBackendUser()
+    {
+        return $GLOBALS['BE_USER'];
+    }
+
+    /**
+     * @return LanguageService
+     */
+    protected function getLanguageService()
+    {
+        return $GLOBALS['LANG'];
+    }
+}

Configuration/TCA/Overrides/pages.php

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+<?php
+
+(function ()
+{
+    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::registerPageTSConfigFile(
+        'demander',
+        'Configuration/TSconfig/Page/linkHandler.tsconfig',
+        'Filtered Results Link Handler (Demand)'
+    );
+})();

Configuration/TSconfig/Page/linkHandler.tsconfig

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+
+TCEMAIN.linkHandler.demander {
+  handler = Pixelant\Demander\LinkHandler\DemandLinkHandler
+  label = LLL:EXT:demander/Resources/Private/Language/locallang_be.xlf:linkHandler.label
+  configuration {
+
+  }
+  scanAfter = page
+}

Resources/Private/Language/locallang_be.xlf

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+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<xliff version="1.0">
+	<file source-language="en" datatype="plaintext" original="messages" date="2021-01-11T13:00:00Z" product-name="demander">
+		<header/>
+		<body>
+			<trans-unit id="linkHandler.label" xml:space="preserve">
+				<source>Filtered Results</source>
+			</trans-unit>
+		</body>
+	</file>
+</xliff>

Resources/Private/Templates/LinkBrowser/Standard/DemandLinkHandler.html

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+<html xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers" data-namespace-typo3-fluid="true">
+<div class="element-browser-panel element-browser-main">
+    <div class="element-browser-main-sidebar">
+        <div class="element-browser-body">
+            <f:format.raw>{tree}</f:format.raw>
+        </div>
+    </div>
+    <div class="element-browser-main-content">
+        <div class="element-browser-body">
+            <div class="link-browser-section">
+                <f:if condition="{expandActivePage}">
+                    ddd
+                </f:if>
+            </div>
+        </div>
+    </div>
+</div>
+</html>

Resources/Public/JavaScript/DemandLinkHandler.js

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+define(['jquery', 'TYPO3/CMS/Recordlist/LinkBrowser'], function($, LinkBrowser) {
+  'use strict';
+
+  var demandLinkHandler = {};
+
+  demandLinkHandler.createMyLink = function() {
+    var val = $('.myElmeent').val(); // Example
+
+    LinkBrowser.finalizeFunction('t3://demander?' + val); // Example
+  };
+
+  demandLinkHandler.initialize = function() {
+    // Catch page click
+    $('.t3js-pageLink').on('click', function (e) {
+      e.preventDefault();
+
+      console.log($(this).attr('href')); // TODO: Process demand configuration for selected page
+    })
+
+    // TODO: add necessary event handlers, which will propably call demandLinkHandler.createMyLink
+  };
+
+  $(demandLinkHandler.initialize);
+
+  return demandLinkHandler;
+});