Added Next/Previous buttons to file viewer when viewing from a dataset

Author: bodom0015

app/controllers/Files.scala

@@ -220,6 +220,37 @@ class Files @Inject() (
           }
         }
 
+
+
+        //val fileList = files.
+        val pager: Option[models.Pager] = dataset match {
+          case None => None
+          case Some(dsId) => {
+            datasets.get(new UUID(dsId)) match {
+              case None => None
+              case Some(ds) => {
+                val lastIndex = ds.files.length - 1
+                val index = ds.files.indexOf(id)
+
+                // Set prevFile / nextFile, if applicable
+                if (index > 0 && index < lastIndex) {
+                  // Yields UUID of prevFile and nextFile
+                  Some(Pager(Some(ds.files(index - 1)), Some(ds.files(index + 1))))
+                }else if (index == 0 && index < lastIndex) {
+                  // This is the first file in the list, but not the last
+                  Some(Pager(None, Some(ds.files(index + 1))))
+                } else if (index > 0 && index == lastIndex) {
+                  // This is the last file in the list, but not the first
+                  Some(Pager(Some(ds.files(index - 1)), None))
+                } else {
+                  // There is one item on the list, disable paging
+                  None
+                }
+              }
+            }
+          }
+        }
+
         //call Polyglot to get all possible output formats for this file's content type
         current.plugin[PolyglotPlugin] match {
           case Some(plugin) => {
@@ -238,7 +269,7 @@ class Files @Inject() (
             plugin.getOutputFormats(contentTypeEnding).map(outputFormats =>
               Ok(views.html.file(file, id.stringify, commentsByFile, previewsWithPreviewer, sectionsWithPreviews,
                 extractorsActive, decodedDatasetsContaining.toList, foldersContainingFile,
-                mds, isRDFExportEnabled, extractionGroups, outputFormats, space, access, folderHierarchy.reverse.toList, decodedSpacesContaining.toList, allDecodedDatasets.toList, view_count, view_date)))
+                mds, isRDFExportEnabled, extractionGroups, outputFormats, space, access, folderHierarchy.reverse.toList, decodedSpacesContaining.toList, allDecodedDatasets.toList, view_count, view_date, pager)))
           }
           case None =>
             Logger.debug("Polyglot plugin not found")
@@ -249,7 +280,7 @@ class Files @Inject() (
             //passing None as the last parameter (list of output formats)
             Future(Ok(views.html.file(file, id.stringify, commentsByFile, previewsWithPreviewer, sectionsWithPreviews,
               extractorsActive, decodedDatasetsContaining.toList, foldersContainingFile,
-              mds, isRDFExportEnabled, extractionGroups, None, space, access, folderHierarchy.reverse.toList, decodedSpacesContaining.toList, allDecodedDatasets.toList, view_count, view_date)))
+              mds, isRDFExportEnabled, extractionGroups, None, space, access, folderHierarchy.reverse.toList, decodedSpacesContaining.toList, allDecodedDatasets.toList, view_count, view_date, pager)))
         }
       }
 

app/models/Pager.scala

@@ -0,0 +1,6 @@
+package models
+
+case class Pager(
+  prev: Option[models.UUID],
+  next: Option[models.UUID]
+)

app/views/file.scala.html

@@ -6,7 +6,7 @@
 		rdfExported: Boolean,
 		extractionsStatus: Map[String, ExtractionGroup], outputFormats: Option[List[String]], spaceId: Option[String], access:String,
 		folderHierarchy: List[Folder], spaces:List[ProjectSpace], allDatasets: List[Dataset],
-		view_count: Int, view_date: java.util.Date)(implicit user: Option[models.User], request: RequestHeader)
+		view_count: Int, view_date: java.util.Date, pager: Option[models.Pager])(implicit user: Option[models.User], request: RequestHeader)
 
 @import helper._
 @import play.api.Play.current
@@ -588,6 +588,50 @@ <h4>Sections</h4>
 			}
 
 
+					@** Only enable paging when viewing from a dataset? *@
+					@if(allDatasets.length == 1) {
+						@allDatasets.map { ds =>
+							@pager match {
+								case None => {}
+								case Some(pg) => {
+									<div class="row bottom-padding">
+										<div class="col-sm-12 col-md-12 col-lg-12">
+											@pg.prev match {
+												case None => {}
+												case Some(prev) => {
+													<a class="btn btn-sm btn-link pull-left" style="border-radius:15px;border-color:lightgray;" href="@routes.Files.file(prev, if(datasets.length > 0) {
+														Some(datasets.head.id.stringify)
+													} else {
+														None
+													}, spaceId, if(folders.length > 0) {
+														Some(folders.head.id.stringify)
+													} else {
+														None
+													})"><i class="glyphicon glyphicon-arrow-left"></i> Prev</a>
+												}
+											}
+											@pg.next match {
+												case None => {}
+												case Some(next) => {
+													<a class="btn btn-sm btn-link pull-right" style="border-radius:15px;border-color:lightgray;" href="@routes.Files.file(next, if(datasets.length > 0) {
+														Some(datasets.head.id.stringify)
+													} else {
+														None
+													}, spaceId, if(folders.length > 0) {
+														Some(folders.head.id.stringify)
+													} else {
+														None
+													})">Next <i class="glyphicon glyphicon-arrow-right"></i></a>
+												}
+											}
+
+										</div>
+									</div>
+								}
+							}
+						}
+					}
+
 
 			<div class="tabbable" id="bottomDatasetTabbable"> <!-- Only required for left/right tabs -->
 				<ul class="nav nav-tabs margin-bottom-20" >