[FEATURE] Seamless document browsing

Classes/Controller/NavigationController.php

@@ -78,6 +78,14 @@ public function mainAction(): void
             $this->viewData['requestData'] = $this->requestData;
         }
 
+        // get the closest previous sibling or leaf node
+        $prevDocumentUid = $this->documentRepository->getPreviousDocumentUid($this->document->getUid());
+        $this->view->assign('documentBack', $prevDocumentUid);
+
+        // get the closest next sibling or leaf node
+        $nextDocumentUid = $this->documentRepository->getNextDocumentUid($this->document->getUid());
+        $this->view->assign('documentForward', $nextDocumentUid);
+
         // Steps for X pages backward / forward. Double page view uses double steps.
         $pageSteps = $this->settings['pageStep'] * ($this->requestData['double'] + 1);
 

Classes/Domain/Repository/DocumentRepository.php

@@ -645,4 +645,168 @@ private function findSolr($collections, $settings, $searchParams, $listedMetadat
         $search->prepare();
         return $search;
     }
+
+    /**
+     * Find the uid of the previous document relative to the current document uid.
+     * Otherwise backtrack the closest previous leaf node.
+     *
+     * @access public
+     *
+     * @param int $uid
+     *
+     * @return int|null
+     */
+    public function getPreviousDocumentUid($uid)
+    {
+        $currentDocument = $this->findOneByUid($uid);
+        $currentVolume = '';
+        $parentId = $currentDocument->getPartof();
+
+        if ($parentId) {
+
+            $currentVolume = (string) $currentDocument->getVolumeSorting();
+
+            $connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
+            $queryBuilder = $connectionPool->getQueryBuilderForTable('tx_dlf_documents');
+
+            // Grab previous volume
+            $prevDocument = $queryBuilder
+                ->select(
+                    'tx_dlf_documents.uid AS uid'
+                )
+                ->from('tx_dlf_documents')
+                ->where(
+                    $queryBuilder->expr()->eq('tx_dlf_documents.partof', (int) $parentId),
+                    'tx_dlf_documents.volume_sorting < \'' . $currentVolume . '\''
+                )
+                ->add('orderBy', 'volume_sorting desc')
+                ->addOrderBy('tx_dlf_documents.volume_sorting')
+                ->execute()
+                ->fetch();
+
+            if (!empty($prevDocument)) {
+                return $prevDocument['uid'];
+            }
+
+            return $this->getLastChild($this->getPreviousDocumentUid($parentId));
+        }
+
+        return null;
+    }
+
+    /**
+     * Find the uid of the next document relative to the current document uid.
+     * Otherwise backtrack the closest next leaf node.
+     *
+     * @access public
+     *
+     * @param int $uid
+     *
+     * @return int|null
+     */
+    public function getNextDocumentUid($uid)
+    {
+        $currentDocument = $this->findOneByUid($uid);
+        $currentVolume = '';
+        $parentId = $currentDocument->getPartof();
+
+        if ($parentId) {
+
+            $currentVolume = (string) $currentDocument->getVolumeSorting();
+
+            $connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
+            $queryBuilder = $connectionPool->getQueryBuilderForTable('tx_dlf_documents');
+
+            // Grab next volume
+            $nextDocument = $queryBuilder
+                ->select(
+                    'tx_dlf_documents.uid AS uid'
+                )
+                ->from('tx_dlf_documents')
+                ->where(
+                    $queryBuilder->expr()->eq('tx_dlf_documents.partof', (int) $parentId),
+                    'tx_dlf_documents.volume_sorting > \'' . $currentVolume . '\''
+                )
+                ->add('orderBy', 'volume_sorting asc')
+                ->addOrderBy('tx_dlf_documents.volume_sorting')
+                ->execute()
+                ->fetch();
+
+            if (!empty($nextDocument)) {
+                return $nextDocument['uid'];
+            }
+
+            return $this->getFirstChild($this->getNextDocumentUid($parentId));
+        }
+
+        return null;
+    }
+
+    /**
+     * Find the uid of the first leaf node
+     *
+     * @access public
+     *
+     * @param int $uid
+     *
+     * @return int
+     */
+    public function getFirstChild($uid)
+    {
+        $connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
+        $queryBuilder = $connectionPool->getQueryBuilderForTable('tx_dlf_documents');
+
+        $child = $queryBuilder
+            ->select(
+                'tx_dlf_documents.uid AS uid'
+            )
+            ->from('tx_dlf_documents')
+            ->where(
+                $queryBuilder->expr()->eq('tx_dlf_documents.partof', (int) $uid)
+            )
+            ->add('orderBy', 'volume_sorting asc')
+            ->addOrderBy('tx_dlf_documents.volume_sorting')
+            ->execute()
+            ->fetch();
+
+        if (empty($child['uid'])) {
+            return $uid;
+        }
+
+        return $this->getFirstChild($child['uid']);
+    }
+
+    /**
+     * Find the uid of the last leaf node
+     *
+     * @access public
+     *
+     * @param int $uid
+     *
+     * @return int
+     */
+    public function getLastChild($uid)
+    {
+        $connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
+        $queryBuilder = $connectionPool->getQueryBuilderForTable('tx_dlf_documents');
+
+        $child = $queryBuilder
+            ->select(
+                'tx_dlf_documents.uid AS uid'
+            )
+            ->from('tx_dlf_documents')
+            ->where(
+                $queryBuilder->expr()->eq('tx_dlf_documents.partof', (int) $uid)
+            )
+            ->add('orderBy', 'volume_sorting desc')
+            ->addOrderBy('tx_dlf_documents.volume_sorting')
+            ->execute()
+            ->fetch();
+
+        if (empty($child['uid'])) {
+            return $uid;
+        }
+
+        return $this->getFirstChild($child['uid']);
+    }
 }

Configuration/FlexForms/Navigation.xml

@@ -72,16 +72,24 @@
                                         <numIndex index="0">LLL:EXT:dlf/Resources/Private/Language/locallang_be.xlf:plugins.navigation.flexform.features.rotation</numIndex>
                                         <numIndex index="1">rotation</numIndex>
                                     </numIndex>
-                                    <numIndex index="10">
+                                    <numIndex index="11">
                                         <numIndex index="0">LLL:EXT:dlf/Resources/Private/Language/locallang_be.xlf:plugins.navigation.flexform.features.measureForward</numIndex>
                                         <numIndex index="1">measureForward</numIndex>
                                     </numIndex>
-                                    <numIndex index="11">
+                                    <numIndex index="12">
                                         <numIndex index="0">LLL:EXT:dlf/Resources/Private/Language/locallang_be.xlf:plugins.navigation.flexform.features.measureBack</numIndex>
                                         <numIndex index="1">measureBack</numIndex>
                                     </numIndex>
+                                    <numIndex index="13">
+                                        <numIndex index="0">LLL:EXT:dlf/Resources/Private/Language/locallang_be.xlf:plugins.navigation.flexform.features.documentBack</numIndex>
+                                        <numIndex index="1">documentBack</numIndex>
+                                    </numIndex>
+                                    <numIndex index="14">
+                                        <numIndex index="0">LLL:EXT:dlf/Resources/Private/Language/locallang_be.xlf:plugins.navigation.flexform.features.documentForward</numIndex>
+                                        <numIndex index="1">documentForward</numIndex>
+                                    </numIndex>
                                 </items>
-                                <default>doublePage,pageFirst,pageBack,pageStepBack,pageSelect,pageForward,pageStepForward,pageLast,listView,zoom,rotation,measureForward,measureBack</default>
+                                <default>doublePage,pageFirst,pageBack,pageStepBack,pageSelect,pageForward,pageStepForward,pageLast,listView,zoom,rotation,measureForward,measureBack,documentBack,documentForward</default>
                                 <minitems>1</minitems>
                             </config>
                         </TCEforms>

Resources/Private/Language/de.locallang.xlf

@@ -293,6 +293,14 @@
 				<source><![CDATA[Next Measure]]></source>
 				<target><![CDATA[Nächster Takt]]></target>
 			</trans-unit>
+			<trans-unit id="navigation.documentBack" approved="yes">
+				<source><![CDATA[Previous document]]></source>
+				<target><![CDATA[Vorheriges Dokument]]></target>
+			</trans-unit>
+			<trans-unit id="navigation.documentForward" approved="yes">
+				<source><![CDATA[Next document]]></source>
+				<target><![CDATA[Nächstes Dokument]]></target>
+			</trans-unit>
 			<trans-unit id="search.dateFrom" approved="yes">
 				<source><![CDATA[From]]></source>
 				<target><![CDATA[Von]]></target>

Resources/Private/Language/de.locallang_be.xlf

@@ -309,6 +309,14 @@
 				<source><![CDATA[One measureBack back]]></source>
 				<target><![CDATA[Ein Takt zurück]]></target>
 			</trans-unit>
+			<trans-unit id="plugins.navigation.flexform.features.documentBack" approved="yes">
+				<source><![CDATA[Show previous document]]></source>
+				<target><![CDATA[Ein Dokument zurück]]></target>
+			</trans-unit>
+			<trans-unit id="plugins.navigation.flexform.features.documentForward" approved="yes">
+				<source><![CDATA[Show next document]]></source>
+				<target><![CDATA[Ein Dokument vor]]></target>
+			</trans-unit>
 			<trans-unit id="plugins.navigation.title" approved="yes">
 				<source><![CDATA[Kitodo: Navigation]]></source>
 				<target><![CDATA[Kitodo: Navigation]]></target>

Resources/Private/Language/locallang.xlf

@@ -185,6 +185,12 @@
 			<trans-unit id="nextMeasure">
 				<source><![CDATA[Next Measure]]></source>
 			</trans-unit>
+			<trans-unit id="navigation.documentBack">
+				<source><![CDATA[Previous document]]></source>
+			</trans-unit>
+			<trans-unit id="navigation.documentForward">
+				<source><![CDATA[Next document]]></source>
+			</trans-unit>
 			<trans-unit id="selectPage">
 				<source><![CDATA[Page]]></source>
 			</trans-unit>

Resources/Private/Language/locallang_be.xlf

@@ -212,6 +212,12 @@
 			<trans-unit id="plugins.navigation.flexform.features.measureBack">
 				<source><![CDATA[One measureBack back]]></source>
 			</trans-unit>
+			<trans-unit id="plugins.navigation.flexform.features.documentBack">
+				<source><![CDATA[Show previous document]]></source>
+			</trans-unit>
+			<trans-unit id="plugins.navigation.flexform.features.documentForward">
+				<source><![CDATA[Show next document]]></source>
+			</trans-unit>
 			<trans-unit id="plugins.navigation.title">
 				<source><![CDATA[Kitodo: Navigation]]></source>
 			</trans-unit>

Resources/Private/Templates/Navigation/Main.html

@@ -302,4 +302,38 @@
     </f:if>
 </f:section>
 
+<f:section name="render.documentBack">
+    <div class="tx-dlf-navigation-documentBack">
+        <f:if condition="{documentBack}">
+            <f:then>
+                <f:link.action addQueryString="1" addQueryStringMethod="GET" additionalParams="{'tx_dlf[page]':'1', 'tx_dlf[id]': '{documentBack}'}" title="{f:translate(key: 'navigation.documentBack')}">
+                    <f:translate key="navigation.documentBack"/>
+                </f:link.action>
+            </f:then>
+            <f:else>
+                <span title="{f:translate(key: 'navigation.documentBack')}">
+                    <f:translate key="navigation.documentBack"/>
+                </span>
+            </f:else>
+        </f:if>
+    </div>
+</f:section>
+
+<f:section name="render.documentForward">
+    <div class="tx-dlf-navigation-documentForward">
+        <f:if condition="{documentForward}">
+            <f:then>
+                <f:link.action addQueryString="1" addQueryStringMethod="GET" additionalParams="{'tx_dlf[page]':'1', 'tx_dlf[id]': '{documentForward}'}" title="{f:translate(key: 'navigation.documentForward')}">
+                    <f:translate key="navigation.documentForward"/>
+                </f:link.action>
+            </f:then>
+            <f:else>
+                <span title="{f:translate(key: 'navigation.documentForward')}">
+                    <f:translate key="navigation.documentForward"/>
+                </span>
+            </f:else>
+        </f:if>
+    </div>
+</f:section>
+
 </html>