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Code Issues Releases Wiki Activity

Moved and documented DraggableRowFactory

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This commit is contained in:
Carlos Galindo 2019-09-13 13:21:29 +02:00
commit 7c46dee784
Signed by: kauron
GPG key ID: 83E68706DEE119A3
2 changed files with 6 additions and 4 deletions
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1
src/main/java/es/kauron/jstudy/controller/TableController.java
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@ -2,6 +2,7 @@ package es.kauron.jstudy.controller;
import es.kauron.jstudy.model.AppPrefs;
import es.kauron.jstudy.model.TestItem;
import es.kauron.jstudy.util.DraggableRowFactory;
import javafx.beans.binding.Bindings;
import javafx.beans.property.*;
import javafx.collections.FXCollections;

93
src/main/java/es/kauron/jstudy/util/DraggableRowFactory.java Normal file
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@ -0,0 +1,93 @@
package es.kauron.jstudy.util;
import javafx.collections.ObservableList;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.DataFormat;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import java.util.ArrayList;
import java.util.List;
// Adapted from https://stackoverflow.com/a/52437193
public class DraggableRowFactory<S> {
private static final DataFormat SERIALIZED_MIME_TYPE = new DataFormat("application/x-java-serialized-object");
private final ObservableList<S> data;
private final List<S> dragging = new ArrayList<>();
public DraggableRowFactory(ObservableList<S> data) {
this.data = data;
}
public TableRow<S> generator(TableView<S> table) {
TableRow<S> row = new TableRow<>();
row.setOnDragDetected((event) -> {
if (!row.isEmpty() && table.getItems().size() == data.size()) {
Integer index = row.getIndex();
dragging.clear();
dragging.addAll(table.getSelectionModel().getSelectedItems());
Dragboard db = row.startDragAndDrop(TransferMode.MOVE);
ClipboardContent cc = new ClipboardContent();
cc.put(SERIALIZED_MIME_TYPE, index);
db.setContent(cc);
event.consume();
}
});
row.setOnDragOver((event) -> {
Dragboard db = event.getDragboard();
if (db.hasContent(SERIALIZED_MIME_TYPE)) {
if (row.getIndex() != (Integer) db.getContent(SERIALIZED_MIME_TYPE)) {
event.acceptTransferModes(TransferMode.COPY_OR_MOVE);
event.consume();
}
}
});
row.setOnDragDropped((event) -> {
Dragboard db = event.getDragboard();
if (!db.hasContent(SERIALIZED_MIME_TYPE))
return;
int dropIndex;
S item = null;
if (row.isEmpty()) {
dropIndex = table.getItems().size();
} else {
dropIndex = row.getIndex();
item = table.getItems().get(dropIndex);
}
int delta = 0;
if (item != null) {
while (dragging.contains(item)) {
delta = 1;
--dropIndex;
if (dropIndex < 0) {
item = null;
dropIndex = 0;
break;
}
item = table.getItems().get(dropIndex);
}
}
data.removeAll(dragging);
if (item != null)
dropIndex = table.getItems().indexOf(item) + delta;
else if (dropIndex != 0)
dropIndex = table.getItems().size();
table.getSelectionModel().clearSelection();
for (S s : dragging) {
data.add(dropIndex, s);
table.getSelectionModel().select(dropIndex);
dropIndex++;
}
event.setDropCompleted(true);
dragging.clear();
event.consume();
});
return row;
}
}