Java by API/org.eclipse.swt.dnd/DropTarget

DropTarget: addDropListener(DropTargetListener lis)

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 MainClass {
  public static void main(String[] a) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setSize(250, 200);
    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) {
        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();
      }
    });
    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;
        }
        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)) {
          DropTarget target = (DropTarget) event.widget;
          Table table = (Table) target.getControl();
          String data = (String) event.data;
          TableItem item = new TableItem(table, SWT.NONE);
          item.setText(new String[] { data });
          table.redraw();
        }
      }
    });
    TableColumn column = new TableColumn(table, SWT.NONE);
    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();
  }
}

new DropTarget(Control control, int style)

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 MainClass {
  public static void main(String[] a) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setSize(250, 200);
    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) {
        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();
      }
    });
    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;
        }
        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)) {
          DropTarget target = (DropTarget) event.widget;
          Table table = (Table) target.getControl();
          String data = (String) event.data;
          TableItem item = new TableItem(table, SWT.NONE);
          item.setText(new String[] { data });
          table.redraw();
        }
      }
    });
    TableColumn column = new TableColumn(table, SWT.NONE);
    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();
  }
}