DragDropTable.java Source code

Introduction

Here is the source code for DragDropTable.java

Source

import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;

public class DragDropTable {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());

        Table table = new Table(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);

        Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
        DragSource source = new DragSource(table, DND.DROP_MOVE | DND.DROP_COPY);
        source.setTransfer(types);

        source.addDragListener(new DragSourceAdapter() {
            public void dragSetData(DragSourceEvent event) {
                // Get the selected items in the drag source
                DragSource ds = (DragSource) event.widget;
                Table table = (Table) ds.getControl();
                TableItem[] selection = table.getSelection();

                StringBuffer buff = new StringBuffer();
                for (int i = 0, n = selection.length; i < n; i++) {
                    buff.append(selection[i].getText());
                }

                event.data = buff.toString();
            }
        });

        // Create the drop target
        DropTarget target = new DropTarget(table, DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT);
        target.setTransfer(types);
        target.addDropListener(new DropTargetAdapter() {
            public void dragEnter(DropTargetEvent event) {
                if (event.detail == DND.DROP_DEFAULT) {
                    event.detail = (event.operations & DND.DROP_COPY) != 0 ? DND.DROP_COPY : DND.DROP_NONE;
                }

                // Allow dropping text only
                for (int i = 0, n = event.dataTypes.length; i < n; i++) {
                    if (TextTransfer.getInstance().isSupportedType(event.dataTypes[i])) {
                        event.currentDataType = event.dataTypes[i];
                    }
                }
            }

            public void dragOver(DropTargetEvent event) {
                event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
            }

            public void drop(DropTargetEvent event) {
                if (TextTransfer.getInstance().isSupportedType(event.currentDataType)) {
                    // Get the dropped data
                    DropTarget target = (DropTarget) event.widget;
                    Table table = (Table) target.getControl();
                    String data = (String) event.data;

                    // Create a new item in the table to hold the dropped data
                    TableItem item = new TableItem(table, SWT.NONE);
                    item.setText(new String[] { data });
                    table.redraw();
                }
            }
        });
        TableColumn column = new TableColumn(table, SWT.NONE);

        // Seed the table
        TableItem item = new TableItem(table, SWT.NONE);
        item.setText(new String[] { "A" });
        item = new TableItem(table, SWT.NONE);
        item.setText(new String[] { "B" });
        item = new TableItem(table, SWT.BORDER);
        item.setText(new String[] { "C" });

        column.pack();
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }
}