Drag and Drop inside Table : SWT Drag Drop « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. SWT Drag Drop

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();
  }
}

17.114.SWT Drag Drop
	17.114.1.	Dragging and Dropping
	17.114.2.	Drag selected text in Text to Label
	17.114.3.	Drag and Drop inside Table
	17.114.4.	Drag and Drop example snippet: determine data types available (win32 only)
	17.114.5.	Drag and Drop: define a default operation (in this example, Copy)
	17.114.6.	Drag and Drop: define my own data transfer type
	17.114.7.	Drag leaf items in a tree
	17.114.8.	Drag text between two labels
	17.114.9.	Drag and Drop: determine native data types available (motif only)
	17.114.10.	Make a dropped data type depend on a target item in table