Hide tab bar

src/main/java/org/jabref/gui/Base.css

@@ -664,6 +664,17 @@ TextFlow > .tooltip-text-monospaced {
     -fx-padding: 0 0 0 0;
 }
 
+.tab-pane.hide-tab-bar .tab-header-area {
+    -fx-pref-height: 0;
+    visibility: hidden;
+}
+
+.tab-pane.hide-tab-bar .tab-header-area > .headers-region > .tab {
+    -fx-padding: 0;
+    -fx-border-width: 0;
+    -fx-pref-height: 0;
+}
+
 .numberColumn > .hits:any-selected {
     -fx-background-color: derive(-jr-green, 70%);
 }

src/main/java/org/jabref/gui/LibraryTab.java

@@ -345,6 +345,9 @@ private void onDatabaseLoadingFailed(Exception ex) {
 
     private void setDatabaseContext(BibDatabaseContext bibDatabaseContext) {
         TabPane tabPane = this.getTabPane();
+
+        new TabBarManager(tabPane, stateManager, preferences.getWorkspacePreferences());
+
         if (tabPane == null) {
             LOGGER.debug("User interrupted loading. Not showing any library.");
             return;

src/main/java/org/jabref/gui/TabBarManager.java

@@ -0,0 +1,56 @@
+package org.jabref.gui;
+
+import javafx.beans.property.IntegerProperty;
+import javafx.beans.property.SimpleIntegerProperty;
+import javafx.collections.ListChangeListener;
+import javafx.scene.control.TabPane;
+
+import org.jabref.gui.util.BindingsHelper;
+import org.jabref.model.database.BibDatabaseContext;
+
+public class TabBarManager {
+
+    private final TabPane tabPane;
+    private final StateManager stateManager;
+    private final WorkspacePreferences workspacePreferences;
+    private final IntegerProperty numberOfOpenDatabases;
+
+    public TabBarManager(TabPane tabPane,
+                         StateManager stateManager,
+                         WorkspacePreferences workspacePreferences) {
+        this.tabPane = tabPane;
+        this.stateManager = stateManager;
+        this.workspacePreferences = workspacePreferences;
+        this.numberOfOpenDatabases = new SimpleIntegerProperty();
+
+        stateManager.getOpenDatabases().addListener((ListChangeListener<BibDatabaseContext>) change -> {
+            this.numberOfOpenDatabases.set(stateManager.getOpenDatabases().size());
+            updateTabBarState();
+        });
+
+        BindingsHelper.subscribeFuture(workspacePreferences.confirmHideTabBarProperty(), hideTabBar -> updateTabBarState());
+        maintainInitialTabBarState(workspacePreferences.shouldHideTabBar());
+    }
+
+    public void updateTabBarState() {
+        if (workspacePreferences.shouldHideTabBar() && numberOfOpenDatabases.get() == 1) {
+            if (!tabPane.getStyleClass().contains("hide-tab-bar")) {
+                tabPane.getStyleClass().add("hide-tab-bar");
+            }
+        } else {
+            tabPane.getStyleClass().remove("hide-tab-bar");
+        }
+    }
+
+    public void maintainInitialTabBarState(boolean show) {
+        if (show) {
+            if (stateManager.getOpenDatabases().size() == 1) {
+                if (!tabPane.getStyleClass().contains("hide-tab-bar")) {
+                    tabPane.getStyleClass().add("hide-tab-bar");
+                }
+            } else {
+                tabPane.getStyleClass().remove("hide-tab-bar");
+            }
+        }
+    }
+}

src/main/java/org/jabref/gui/WorkspacePreferences.java

@@ -25,6 +25,7 @@ public class WorkspacePreferences {
     private final BooleanProperty showAdvancedHints;
     private final BooleanProperty warnAboutDuplicatesInInspection;
     private final BooleanProperty confirmDelete;
+    private final BooleanProperty confirmHideTabBar;
     private final ObservableList<String> selectedSlrCatalogs;
 
     public WorkspacePreferences(Language language,
@@ -37,6 +38,7 @@ public WorkspacePreferences(Language language,
                                 boolean showAdvancedHints,
                                 boolean warnAboutDuplicatesInInspection,
                                 boolean confirmDelete,
+                                boolean confirmHideTabBar,
                                 List<String> selectedSlrCatalogs) {
         this.language = new SimpleObjectProperty<>(language);
         this.shouldOverrideDefaultFontSize = new SimpleBooleanProperty(shouldOverrideDefaultFontSize);
@@ -48,6 +50,7 @@ public WorkspacePreferences(Language language,
         this.showAdvancedHints = new SimpleBooleanProperty(showAdvancedHints);
         this.warnAboutDuplicatesInInspection = new SimpleBooleanProperty(warnAboutDuplicatesInInspection);
         this.confirmDelete = new SimpleBooleanProperty(confirmDelete);
+        this.confirmHideTabBar = new SimpleBooleanProperty(confirmHideTabBar);
         this.selectedSlrCatalogs = FXCollections.observableArrayList(selectedSlrCatalogs);
     }
 
@@ -163,6 +166,18 @@ public void setConfirmDelete(boolean confirmDelete) {
         this.confirmDelete.set(confirmDelete);
     }
 
+    public boolean shouldHideTabBar() {
+        return confirmHideTabBar.get();
+    }
+
+    public BooleanProperty confirmHideTabBarProperty() {
+        return confirmHideTabBar;
+    }
+
+    public void setHideTabBar(boolean hideTabBar) {
+        this.confirmHideTabBar.set(hideTabBar);
+    }
+
     public ObservableList<String> getSelectedSlrCatalogs() {
         return selectedSlrCatalogs;
     }

src/main/java/org/jabref/gui/preferences/JabRefGuiPreferences.java

@@ -169,6 +169,7 @@ public class JabRefGuiPreferences extends JabRefCliPreferences implements GuiPre
     private static final String OVERRIDE_DEFAULT_FONT_SIZE = "overrideDefaultFontSize";
     private static final String SHOW_ADVANCED_HINTS = "showAdvancedHints";
     private static final String CONFIRM_DELETE = "confirmDelete";
+    private static final String CONFIRM_HIDE_TAB_BAR = "confirmHideTabBar";
     // endregion
 
     private static final String ENTRY_EDITOR_HEIGHT = "entryEditorHeightFX";
@@ -266,6 +267,7 @@ private JabRefGuiPreferences() {
         defaults.put(THEME, Theme.BASE_CSS);
         defaults.put(THEME_SYNC_OS, Boolean.FALSE);
         defaults.put(CONFIRM_DELETE, Boolean.TRUE);
+        defaults.put(CONFIRM_HIDE_TAB_BAR, Boolean.TRUE);
         defaults.put(SHOW_ADVANCED_HINTS, Boolean.TRUE);
         // endregion
 
@@ -633,6 +635,7 @@ public WorkspacePreferences getWorkspacePreferences() {
                 getBoolean(SHOW_ADVANCED_HINTS),
                 getBoolean(WARN_ABOUT_DUPLICATES_IN_INSPECTION),
                 getBoolean(CONFIRM_DELETE),
+                getBoolean(CONFIRM_HIDE_TAB_BAR),
                 getStringList(SELECTED_SLR_CATALOGS));
 
         EasyBind.listen(workspacePreferences.languageProperty(), (obs, oldValue, newValue) -> {
@@ -651,6 +654,7 @@ public WorkspacePreferences getWorkspacePreferences() {
         EasyBind.listen(workspacePreferences.showAdvancedHintsProperty(), (obs, oldValue, newValue) -> putBoolean(SHOW_ADVANCED_HINTS, newValue));
         EasyBind.listen(workspacePreferences.warnAboutDuplicatesInInspectionProperty(), (obs, oldValue, newValue) -> putBoolean(WARN_ABOUT_DUPLICATES_IN_INSPECTION, newValue));
         EasyBind.listen(workspacePreferences.confirmDeleteProperty(), (obs, oldValue, newValue) -> putBoolean(CONFIRM_DELETE, newValue));
+        EasyBind.listen(workspacePreferences.confirmHideTabBarProperty(), (obs, oldValue, newValue) -> putBoolean(CONFIRM_HIDE_TAB_BAR, newValue));
         workspacePreferences.getSelectedSlrCatalogs().addListener((ListChangeListener<String>) change ->
                 putStringList(SELECTED_SLR_CATALOGS, workspacePreferences.getSelectedSlrCatalogs()));
         return workspacePreferences;

src/main/java/org/jabref/gui/preferences/general/GeneralTab.fxml

@@ -72,6 +72,7 @@
               text="%Warn about unresolved duplicates when closing inspection window"/>
 
     <CheckBox fx:id="confirmDelete" text="%Show confirmation dialog when deleting entries"/>
+    <CheckBox fx:id="confirmHideTabBar" text="%Hide tab bar when single library is present"/>
 
     <Label styleClass="sectionHeader" text="%Single instance" />
     <HBox alignment="CENTER_LEFT" spacing="10.0">

src/main/java/org/jabref/gui/preferences/general/GeneralTab.java

@@ -47,6 +47,7 @@ public class GeneralTab extends AbstractPreferenceTabView<GeneralTabViewModel> i
     @FXML private CheckBox inspectionWarningDuplicate;
 
     @FXML private CheckBox confirmDelete;
+    @FXML private CheckBox confirmHideTabBar;
     @FXML private ComboBox<BibDatabaseMode> biblatexMode;
     @FXML private CheckBox alwaysReformatBib;
     @FXML private CheckBox autosaveLocalLibraries;
@@ -119,6 +120,7 @@ public void initialize() {
         showAdvancedHints.selectedProperty().bindBidirectional(viewModel.showAdvancedHintsProperty());
         inspectionWarningDuplicate.selectedProperty().bindBidirectional(viewModel.inspectionWarningDuplicateProperty());
         confirmDelete.selectedProperty().bindBidirectional(viewModel.confirmDeleteProperty());
+        confirmHideTabBar.selectedProperty().bindBidirectional(viewModel.confirmHideTabBarProperty());
 
         new ViewModelListCellFactory<BibDatabaseMode>()
                 .withText(BibDatabaseMode::getFormattedName)

src/main/java/org/jabref/gui/preferences/general/GeneralTabViewModel.java

@@ -76,6 +76,7 @@ public class GeneralTabViewModel implements PreferenceTabViewModel {
     private final BooleanProperty showAdvancedHintsProperty = new SimpleBooleanProperty();
     private final BooleanProperty inspectionWarningDuplicateProperty = new SimpleBooleanProperty();
     private final BooleanProperty confirmDeleteProperty = new SimpleBooleanProperty();
+    private final BooleanProperty hideTabBarProperty = new SimpleBooleanProperty();
 
     private final ListProperty<BibDatabaseMode> bibliographyModeListProperty = new SimpleListProperty<>();
     private final ObjectProperty<BibDatabaseMode> selectedBiblatexModeProperty = new SimpleObjectProperty<>();
@@ -184,6 +185,7 @@ public void setValues() {
         inspectionWarningDuplicateProperty.setValue(workspacePreferences.shouldWarnAboutDuplicatesInInspection());
 
         confirmDeleteProperty.setValue(workspacePreferences.shouldConfirmDelete());
+        hideTabBarProperty.setValue(workspacePreferences.shouldHideTabBar());
 
         bibliographyModeListProperty.setValue(FXCollections.observableArrayList(BibDatabaseMode.values()));
         selectedBiblatexModeProperty.setValue(libraryPreferences.getDefaultBibDatabaseMode());
@@ -225,6 +227,7 @@ public void storeSettings() {
         workspacePreferences.setWarnAboutDuplicatesInInspection(inspectionWarningDuplicateProperty.getValue());
 
         workspacePreferences.setConfirmDelete(confirmDeleteProperty.getValue());
+        workspacePreferences.setHideTabBar(confirmHideTabBarProperty().getValue());
 
         libraryPreferences.setDefaultBibDatabaseMode(selectedBiblatexModeProperty.getValue());
 
@@ -371,6 +374,10 @@ public BooleanProperty confirmDeleteProperty() {
         return this.confirmDeleteProperty;
     }
 
+    public BooleanProperty confirmHideTabBarProperty() {
+        return this.hideTabBarProperty;
+    }
+
     public ListProperty<BibDatabaseMode> biblatexModeListProperty() {
         return this.bibliographyModeListProperty;
     }

src/main/resources/l10n/JabRef_en.properties

@@ -878,6 +878,8 @@ Attached\ files=Attached files
 Show\ confirmation\ dialog\ when\ deleting\ entries=Show confirmation dialog when deleting entries
 Show\ confirmation\ dialog\ when\ deleting\ attached\ files=Show confirmation dialog when deleting attached files
 
+Hide\ tab\ bar\ when\ single\ library\ is\ present=Hide tab bar when single library is present
+
 Persist\ password\ between\ sessions=Persist password between sessions
 
 Persist\ api\ keys\ between\ sessions=Persist api keys between sessions