Improve drag and drop

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

@@ -26,7 +26,7 @@
  /* Highlights */
  -jr-blue: #0abde3;
  -jr-light-blue: #48dbfb;
- -jr-purple: #f368e0;
+ -jr-purple: #7559C2;
  -jr-light-purple: #ff9ff3;
  -jr-green: #10ac84;
  -jr-light-green: #1dd1a1;
@@ -53,8 +53,6 @@
  -jr-menu-item-foreground: -fx-dark-text-color;
  -jr-menu-forground-active: -fx-dark-text-color;
 
- -jr-drag-target: -jr-accent;
-
  -jr-head-fg: -fx-text-inner-color;
 
  /* All icons/text on toolbars */
@@ -96,6 +94,10 @@
 
  -jr-search-text: -fx-text-base-color;
 
+ /* For drag and drop actions */
+ -jr-drag-target: -jr-purple;
+ -jr-drag-target-hover: derive(-jr-purple, 80%);
+
  /*
  Here are redefinitions of the default properties of modena. They should in principle all be derived from the
  above colors. Goal should be to make as few as possible direct color-changes to elements and only do this for
@@ -491,6 +493,17 @@
  -fx-border-radius: 0;
 }
 
+.tab-pane > .tab-header-area > .headers-region > .tab.drop {
+ -fx-border-color: -jr-drag-target;
+ -fx-background-color: -jr-drag-target-hover;
+ -fx-border-width: 3 1 1 1;
+}
+
+.tab-pane > .tab-header-area > .headers-region > .tab.drop .tab-label {
+ -fx-fill: -jr-drag-target;
+ -fx-text-fill: -jr-drag-target;
+}
+
 .tab-pane > .tab-header-area > .tab-header-background {
  -fx-background-color: -jr-background-alt;
 }

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

@@ -5,7 +5,6 @@
 import javafx.scene.input.DataFormat;
 
 import org.jabref.logic.citationstyle.PreviewLayout;
-import org.jabref.model.entry.BibEntry;
 
 /**
  * Contains all the different {@link DataFormat}s that may occur in JabRef.
@@ -15,7 +14,6 @@ public class DragAndDropDataFormats {
  public static final DataFormat GROUP = new DataFormat("dnd/org.jabref.model.groups.GroupTreeNode");
  public static final DataFormat LINKED_FILE = new DataFormat("dnd/org.jabref.model.entry.LinkedFile");
  public static final DataFormat ENTRIES = new DataFormat("dnd/org.jabref.model.entry.BibEntries");
- @SuppressWarnings("unchecked") public static final Class<List<BibEntry>> BIBENTRY_LIST_CLASS = (Class<List<BibEntry>>) (Class<?>) List.class;
  public static final DataFormat PREVIEWLAYOUTS = new DataFormat("dnd/org.jabref.logic.citationstyle.PreviewLayouts");
  @SuppressWarnings("unchecked") public static final Class<List<PreviewLayout>> PREVIEWLAYOUT_LIST_CLASS = (Class<List<PreviewLayout>>) (Class<?>) List.class;
 }

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

@@ -0,0 +1,26 @@
+package org.jabref.gui;
+
+import java.io.File;
+import java.nio.file.Path;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import javafx.scene.input.Dragboard;
+
+import org.jabref.logic.util.io.FileUtil;
+
+public class DragAndDropHelper {
+
+ public static boolean hasBibFiles(Dragboard dragboard) {
+ return !getBibFiles(dragboard).isEmpty();
+ }
+
+ public static List<Path> getBibFiles(Dragboard dragboard) {
+ if (!dragboard.hasFiles()) {
+ return Collections.emptyList();
+ } else {
+ return dragboard.getFiles().stream().map(File::toPath).filter(FileUtil::isBibFile).collect(Collectors.toList());
+ }
+ }
+}

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

@@ -12,7 +12,6 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.TimerTask;
-import java.util.stream.Collectors;
 
 import javafx.application.Platform;
 import javafx.beans.value.ChangeListener;
@@ -35,7 +34,7 @@
 import javafx.scene.control.TextInputControl;
 import javafx.scene.control.ToolBar;
 import javafx.scene.control.Tooltip;
-import javafx.scene.input.DataFormat;
+import javafx.scene.control.skin.TabPaneSkin;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.input.TransferMode;
 import javafx.scene.layout.BorderPane;
@@ -175,28 +174,7 @@ public void init() {
 
  initKeyBindings();
 
- tabbedPane.setOnDragOver(event -> {
- if (event.getDragboard().hasFiles()) {
- event.acceptTransferModes(TransferMode.COPY, TransferMode.MOVE, TransferMode.LINK);
- }
- });
-
- tabbedPane.setOnDragDropped(event -> {
- boolean success = false;
-
- if (event.getDragboard().hasContent(DataFormat.FILES)) {
- List<Path> files = event.getDragboard().getFiles().stream().map(File::toPath).filter(FileUtil::isBibFile).collect(Collectors.toList());
- success = true;
-
- for (Path file : files) {
- ParserResult pr = OpenDatabase.loadDatabase(file.toString(), Globals.prefs.getImportFormatPreferences(), Globals.getFileUpdateMonitor());
- addParserResult(pr, true);
- }
- }
-
- event.setDropCompleted(success);
- event.consume();
- });
+ initDragAndDrop();
 
  //setBounds(GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds());
  //WindowLocation pw = new WindowLocation(this, JabRefPreferences.POS_X, JabRefPreferences.POS_Y, JabRefPreferences.SIZE_X,
@@ -246,6 +224,57 @@ public void init() {
  initShowTrackingNotification();
  }
 
+ public void initDragAndDrop() {
+ Tab dndIndicator = new Tab(Localization.lang("Open files..."), null);
+ dndIndicator.getStyleClass().add("drop");
+
+ EasyBind.subscribe(tabbedPane.skinProperty(), skin -> {
+ if (!(skin instanceof TabPaneSkin)) {
+ return;
+ }
+
+ // We need to get the tab header, the following is a ugly workaround
+ Node tabHeaderArea = ((TabPaneSkin) this.tabbedPane.getSkin())
+ .getChildren()
+ .stream()
+ .filter(node -> node.getStyleClass().contains("tab-header-area"))
+ .findFirst()
+ .orElseThrow();
+
+ tabHeaderArea.setOnDragOver(event -> {
+ if (DragAndDropHelper.hasBibFiles(event.getDragboard())) {
+ event.acceptTransferModes(TransferMode.ANY);
+ if (!tabbedPane.getTabs().contains(dndIndicator)) {
+ tabbedPane.getTabs().add(dndIndicator);
+ }
+ event.consume();
+ } else {
+ tabbedPane.getTabs().remove(dndIndicator);
+ }
+ });
+
+ tabHeaderArea.setOnDragExited(event -> tabbedPane.getTabs().remove(dndIndicator));
+
+ tabHeaderArea.setOnDragDropped(event -> {
+ tabbedPane.getTabs().remove(dndIndicator);
+
+ boolean success = false;
+
+ List<Path> bibFiles = DragAndDropHelper.getBibFiles(event.getDragboard());
+ if (!bibFiles.isEmpty()) {
+ for (Path file : bibFiles) {
+ ParserResult pr = OpenDatabase.loadDatabase(file.toString(), Globals.prefs.getImportFormatPreferences(), Globals.getFileUpdateMonitor());
+ addParserResult(pr, true);
+ }
+ success = true;
+ }
+
+ event.setDropCompleted(success);
+ event.consume();
+ });
+ });
+ }
+
  private void initKeyBindings() {
  addEventFilter(KeyEvent.KEY_PRESSED, event -> {
  Optional<KeyBinding> keyBinding = Globals.getKeyPrefs().mapToKeyBinding(event);

src/main/java/org/jabref/gui/externalfiles/ImportHandler.java

@@ -87,6 +87,8 @@ public void importAsNewEntries(List<Path> files) {
  entriesToAdd = Collections.singletonList(createEmptyEntryWithLink(file));
  }
  }
+ } else if (FileUtil.isBibFile(file)) {
+ entriesToAdd = contentImporter.importFromBibFile(file, fileUpdateMonitor);
  } else {
  entriesToAdd = Collections.singletonList(createEmptyEntryWithLink(file));
  }
@@ -105,11 +107,6 @@ private BibEntry createEmptyEntryWithLink(Path file) {
  return entry;
  }
 
- public void importEntriesFromBibFiles(Path bibFile) {
- List<BibEntry> entriesToImport = contentImporter.importFromBibFile(bibFile, fileUpdateMonitor);
- importEntries(entriesToImport);
- }
-
  public void importEntries(List<BibEntry> entries) {
  //TODO: Add undo/redo
  //ce.addEdit(new UndoableInsertEntry(panel.getDatabase(), entry));

src/main/java/org/jabref/gui/groups/GroupNodeViewModel.java

@@ -24,6 +24,7 @@
 import org.jabref.gui.util.BackgroundTask;
 import org.jabref.gui.util.BindingsHelper;
 import org.jabref.gui.util.CustomLocalDragboard;
+import org.jabref.gui.util.DroppingMouseLocation;
 import org.jabref.gui.util.TaskExecutor;
 import org.jabref.logic.groups.DefaultGroupsFactory;
 import org.jabref.logic.layout.format.LatexToUnicodeFormatter;
@@ -262,8 +263,7 @@ public Optional<GroupNodeViewModel> getChildByPath(String pathToSource) {
  public boolean acceptableDrop(Dragboard dragboard) {
  // TODO: we should also check isNodeDescendant
  boolean canDropOtherGroup = dragboard.hasContent(DragAndDropDataFormats.GROUP);
- boolean canDropEntries = localDragBoard.hasType(DragAndDropDataFormats.BIBENTRY_LIST_CLASS)
- && (groupNode.getGroup() instanceof GroupEntryChanger);
+ boolean canDropEntries = localDragBoard.hasBibEntries() && (groupNode.getGroup() instanceof GroupEntryChanger);
  return canDropOtherGroup || canDropEntries;
  }
 

src/main/java/org/jabref/gui/groups/GroupTree.css

@@ -49,8 +49,9 @@
 
 .tree-table-row-cell:dragOver-center {
  -fx-border-color: -jr-drag-target;
- -fx-border-width: 2 2 2 2;
- -fx-padding: -2 -2 -2 -2;
+ -fx-border-width: 1 1 1 1;
+ -fx-padding: -1 -1 -1 -1;
+ -fx-background-color: -jr-drag-target-hover;
 }
 
 .tree-table-row-cell:dragOver-top {

src/main/java/org/jabref/gui/groups/GroupTreeView.java

@@ -27,7 +27,6 @@
 import javafx.scene.control.TreeTableRow;
 import javafx.scene.control.TreeTableView;
 import javafx.scene.input.ClipboardContent;
-import javafx.scene.input.DragEvent;
 import javafx.scene.input.Dragboard;
 import javafx.scene.input.MouseButton;
 import javafx.scene.input.MouseEvent;
@@ -40,6 +39,7 @@
 import org.jabref.gui.GUIGlobals;
 import org.jabref.gui.StateManager;
 import org.jabref.gui.util.BindingsHelper;
+import org.jabref.gui.util.ControlHelper;
 import org.jabref.gui.util.CustomLocalDragboard;
 import org.jabref.gui.util.RecursiveTreeItem;
 import org.jabref.gui.util.TaskExecutor;
@@ -74,12 +74,6 @@ public class GroupTreeView {
 
  private DragExpansionHandler dragExpansionHandler;
 
- private static void removePseudoClasses(TreeTableRow<GroupNodeViewModel> row, PseudoClass... pseudoClasses) {
- for (PseudoClass pseudoClass : pseudoClasses) {
- row.pseudoClassStateChanged(pseudoClass, false);
- }
- }
-
  @FXML
  public void initialize() {
  this.localDragboard = GUIGlobals.localDragboard;
@@ -169,10 +163,6 @@ public void initialize() {
  PseudoClass rootPseudoClass = PseudoClass.getPseudoClass("root");
  PseudoClass subElementPseudoClass = PseudoClass.getPseudoClass("sub");
 
- // Pseudo-classes for drag and drop
- PseudoClass dragOverBottom = PseudoClass.getPseudoClass("dragOver-bottom");
- PseudoClass dragOverCenter = PseudoClass.getPseudoClass("dragOver-center");
- PseudoClass dragOverTop = PseudoClass.getPseudoClass("dragOver-top");
  groupTree.setRowFactory(treeTable -> {
  TreeTableRow<GroupNodeViewModel> row = new TreeTableRow<>();
  row.treeItemProperty().addListener((ov, oldTreeItem, newTreeItem) -> {
@@ -226,23 +216,16 @@ public void initialize() {
  //expand node and all children on drag over
  dragExpansionHandler.expandGroup(row.getTreeItem());
 
- removePseudoClasses(row, dragOverBottom, dragOverCenter, dragOverTop);
- switch (getDroppingMouseLocation(row, event)) {
- case BOTTOM:
- row.pseudoClassStateChanged(dragOverBottom, true);
- break;
- case CENTER:
- row.pseudoClassStateChanged(dragOverCenter, true);
- break;
- case TOP:
- row.pseudoClassStateChanged(dragOverTop, true);
- break;
+ if (localDragboard.hasBibEntries()) {
+ ControlHelper.setDroppingPseudoClasses(row);
+ } else {
+ ControlHelper.setDroppingPseudoClasses(row, event);
  }
  }
  event.consume();
  });
  row.setOnDragExited(event -> {
- removePseudoClasses(row, dragOverBottom, dragOverCenter, dragOverTop);
+ ControlHelper.removeDroppingPseudoClasses(row);
  });
 
  row.setOnDragDropped(event -> {
@@ -255,13 +238,13 @@ public void initialize() {
  Optional<GroupNodeViewModel> source = viewModel.rootGroupProperty().get()
  .getChildByPath(pathToSource);
  if (source.isPresent()) {
- source.get().draggedOn(row.getItem(), getDroppingMouseLocation(row, event));
+ source.get().draggedOn(row.getItem(), ControlHelper.getDroppingMouseLocation(row, event));
  success = true;
  }
  }
  }
 
- if (localDragboard.hasType(DragAndDropDataFormats.BIBENTRY_LIST_CLASS)) {
+ if (localDragboard.hasBibEntries()) {
  List<BibEntry> entries = localDragboard.getBibEntries();
  row.getItem().addEntriesToGroup(entries);
  success = true;
@@ -281,7 +264,7 @@ private void updateSelection(List<TreeItem<GroupNodeViewModel>> newSelectedGroup
  if ((newSelectedGroups == null) || newSelectedGroups.isEmpty()) {
  viewModel.selectedGroupsProperty().clear();
  } else {
- List<GroupNodeViewModel> list = newSelectedGroups.stream().filter(model -> model != null && !(model.getValue().getGroupNode().getGroup() instanceof AllEntriesGroup)).map(TreeItem<GroupNodeViewModel>::getValue).collect(Collectors.toList());
+ List<GroupNodeViewModel> list = newSelectedGroups.stream().filter(model -> model != null && !(model.getValue().getGroupNode().getGroup() instanceof AllEntriesGroup)).map(TreeItem::getValue).collect(Collectors.toList());
  viewModel.selectedGroupsProperty().setAll(list);
  }
  }
@@ -378,19 +361,6 @@ private void setupClearButtonField(CustomTextField customTextField) {
  }
  }
 
- /**
- * Determines where the mouse is in the given row.
- */
- private DroppingMouseLocation getDroppingMouseLocation(TreeTableRow<GroupNodeViewModel> row, DragEvent event) {
- if ((row.getHeight() * 0.25) > event.getY()) {
- return DroppingMouseLocation.TOP;
- } else if ((row.getHeight() * 0.75) < event.getY()) {
- return DroppingMouseLocation.BOTTOM;
- } else {
- return DroppingMouseLocation.CENTER;
- }
- }
-
  private class DragExpansionHandler {
  private static final long DRAG_TIME_BEFORE_EXPANDING_MS = 1000;
  private TreeItem<GroupNodeViewModel> draggedItem;

src/main/java/org/jabref/gui/maintable/MainTable.css

@@ -17,6 +17,25 @@
  -fx-fill: -jr-gray-2;
 }
 
+.table-row-cell:dragOver-bottom {
+ -fx-border-color: -jr-drag-target;
+ -fx-border-width: 0 0 2 0;
+ -fx-padding: 0 0 -2 0;
+}
+
+.table-row-cell:dragOver-center {
+ -fx-border-color: -jr-drag-target;
+ -fx-border-width: 1 1 1 1;
+ -fx-padding: -1 -1 -1 -1;
+ -fx-background-color: -jr-drag-target-hover;
+}
+
+.table-row-cell:dragOver-top {
+ -fx-border-color: -jr-drag-target;
+ -fx-border-width: 2 0 0 0;
+ -fx-padding: -2 0 0 0;
+}
+
 .rating > .container {
  -fx-spacing: 2;
 }