Add a "view as BibTeX" option before importing an entry from the cita…

CHANGELOG.md

@@ -11,6 +11,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 
 ### Added
 
+- We added a "view as BibTeX" option before importing an entry from the citation relation tab. [#11826](https://github.com/JabRef/jabref/issues/11826)
 - We added probable search hits instead of exact matches. Sorting by hit score can be done by the new score table column. [#11542](https://github.com/JabRef/jabref/pull/11542)
 - We added support finding LaTeX-encoded special characters based on plain Unicode and vice versa. [#11542](https://github.com/JabRef/jabref/pull/11542)
 - When a search hits a file, the file icon of that entry is changed accordingly. [#11542](https://github.com/JabRef/jabref/pull/11542)

src/main/java/org/jabref/gui/entryeditor/citationrelationtab/CitationRelationsTab.java

@@ -1,6 +1,7 @@
 package org.jabref.gui.entryeditor.citationrelationtab;
 
 import java.io.IOException;
+import java.io.StringWriter;
 import java.net.URI;
 import java.util.Arrays;
 import java.util.List;
@@ -12,11 +13,15 @@
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.css.PseudoClass;
+import javafx.geometry.Insets;
 import javafx.geometry.Pos;
 import javafx.scene.Node;
 import javafx.scene.control.Button;
+import javafx.scene.control.ButtonType;
+import javafx.scene.control.DialogPane;
 import javafx.scene.control.Label;
 import javafx.scene.control.ProgressIndicator;
+import javafx.scene.control.ScrollPane;
 import javafx.scene.control.SplitPane;
 import javafx.scene.control.ToggleButton;
 import javafx.scene.control.Tooltip;
@@ -29,18 +34,24 @@
 import org.jabref.gui.LibraryTab;
 import org.jabref.gui.StateManager;
 import org.jabref.gui.desktop.os.NativeDesktop;
+import org.jabref.gui.entryeditor.EntryEditor;
 import org.jabref.gui.entryeditor.EntryEditorTab;
 import org.jabref.gui.entryeditor.citationrelationtab.semanticscholar.CitationFetcher;
 import org.jabref.gui.entryeditor.citationrelationtab.semanticscholar.SemanticScholarFetcher;
 import org.jabref.gui.icon.IconTheme;
 import org.jabref.gui.preferences.GuiPreferences;
 import org.jabref.gui.util.NoSelectionModel;
 import org.jabref.gui.util.ViewModelListCellFactory;
+import org.jabref.logic.bibtex.BibEntryWriter;
+import org.jabref.logic.bibtex.FieldWriter;
 import org.jabref.logic.database.DuplicateCheck;
+import org.jabref.logic.exporter.BibWriter;
 import org.jabref.logic.l10n.Localization;
+import org.jabref.logic.os.OS;
 import org.jabref.logic.util.BackgroundTask;
 import org.jabref.logic.util.TaskExecutor;
 import org.jabref.model.database.BibDatabaseContext;
+import org.jabref.model.database.BibDatabaseMode;
 import org.jabref.model.database.BibDatabaseModeDetection;
 import org.jabref.model.entry.BibEntry;
 import org.jabref.model.entry.BibEntryTypesManager;
@@ -51,6 +62,8 @@
 
 import com.tobiasdiez.easybind.EasyBind;
 import org.controlsfx.control.CheckListView;
+import org.fxmisc.flowless.VirtualizedScrollPane;
+import org.fxmisc.richtext.CodeArea;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -74,6 +87,9 @@ public class CitationRelationsTab extends EntryEditorTab {
     private final BibEntryRelationsRepository bibEntryRelationsRepository;
     private final CitationsRelationsTabViewModel citationsRelationsTabViewModel;
     private final DuplicateCheck duplicateCheck;
+    private EntryEditor entryEditor;
+
+    private StateManager stateManager;
 
     public CitationRelationsTab(DialogService dialogService,
                                 BibDatabaseContext databaseContext,
@@ -87,6 +103,7 @@ public CitationRelationsTab(DialogService dialogService,
         this.databaseContext = databaseContext;
         this.preferences = preferences;
         this.libraryTab = libraryTab;
+        this.stateManager = stateManager;
         this.taskExecutor = taskExecutor;
         setText(Localization.lang("Citation relations"));
         setTooltip(new Tooltip(Localization.lang("Show articles related by citation")));
@@ -254,6 +271,14 @@ private void styleFetchedListView(CheckListView<CitationRelationItem> listView)
                         vContainer.getChildren().addLast(openWeb);
                     }
 
+                    Button showEntrySource = IconTheme.JabRefIcons.SOURCE.asButton();
+                    showEntrySource.setTooltip(new Tooltip(Localization.lang("%0 source", databaseContext.getMode().getFormattedName())));
+                    showEntrySource.setOnMouseClicked(event -> {
+                        showEntrySourceDialog(entry.entry());
+                    });
+
+                    vContainer.getChildren().addLast(showEntrySource);
+
                     hContainer.getChildren().addAll(entryNode, separator, vContainer);
                     hContainer.getStyleClass().add("entry-container");
 
@@ -270,6 +295,40 @@ private void styleFetchedListView(CheckListView<CitationRelationItem> listView)
         listView.setSelectionModel(new NoSelectionModel<>());
     }
 
+    private String getSourceString(BibEntry entry, BibDatabaseMode type) throws IOException {
+        StringWriter writer = new StringWriter();
+        BibWriter bibWriter = new BibWriter(writer, OS.NEWLINE);
+        FieldWriter fieldWriter = FieldWriter.buildIgnoreHashes(this.preferences.getFieldPreferences());
+        new BibEntryWriter(fieldWriter, new BibEntryTypesManager()).write(entry, bibWriter, type);
+        return writer.toString();
+    }
+
+    private void showEntrySourceDialog(BibEntry entry) {
+        CodeArea ca = new CodeArea();
+        try {
+            ca.appendText(getSourceString(entry, databaseContext.getMode()));
+        } catch (IOException e) {
+            LOGGER.warn("Incorrect entry, could not load source:", e);
+            return;
+        }
+
+        ca.setWrapText(true);
+        ca.setPadding(new Insets(0, 10, 0, 10));
+        ca.showParagraphAtTop(0);
+
+        ScrollPane scrollPane = new ScrollPane();
+        scrollPane.setFitToWidth(true);
+        scrollPane.setFitToHeight(true);
+        scrollPane.setContent(new VirtualizedScrollPane<>(ca));
+
+        DialogPane dialogPane = new DialogPane();
+        dialogPane.setPrefSize(800, 400);
+        dialogPane.setContent(scrollPane);
+        String title = Localization.lang("%0 source", "Show BibTeX");
+
+        dialogService.showCustomDialogAndWait(title, dialogPane, ButtonType.OK);
+    }
+
     /**
      * Method to style heading labels
      *