Simple DND (Drag and Drop) Example


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.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;

public class SimpleDNDExample {

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

    // Create the tree and some tree items
    final Tree tree = new Tree(shell, SWT.NONE);
    TreeItem item1 = new TreeItem(tree, SWT.NONE);
    item1.setText("Item 1");
    TreeItem item2 = new TreeItem(tree, SWT.NONE);
    item2.setText("Item 2");
    TreeItem item3 = new TreeItem(tree, SWT.NONE);
    item3.setText("Item 3");
    TreeItem item4 = new TreeItem(tree, SWT.NONE);
    item4.setText("Item 4");

    // Create the drag source on the tree
    DragSource ds = new DragSource(tree, DND.DROP_MOVE);
    ds.setTransfer(new Transfer[] { TextTransfer.getInstance() });
    ds.addDragListener(new DragSourceAdapter() {
      public void dragSetData(DragSourceEvent event) {
        // Set the data to be the first selected item's text
        event.data = tree.getSelection()[0].getText();
      }
    });

    // Create the button
    final Button button = new Button(shell, SWT.FLAT);
    button.setText("Button");
    button.setAlignment(SWT.CENTER);

    // Create the drop target on the button
    DropTarget dt = new DropTarget(button, DND.DROP_MOVE);
    dt.setTransfer(new Transfer[] { TextTransfer.getInstance() });
    dt.addDropListener(new DropTargetAdapter() {
      public void drop(DropTargetEvent event) {
        // Set the buttons text to be the text being dropped
        button.setText((String) event.data);
      }
    });

    shell.pack();
    shell.open();
    Display display = Display.getDefault();
    while (!shell.isDisposed())
      if (!display.readAndDispatch())
        display.sleep();
    display.dispose();
  }

}

Related examples in the same category

1.	SWT DND (Drag and Drop) comprehensive Example
2.	Word Jumbles
3.	Illustrates dragging
4.	SWT DnD (Drag and drop) Composite
5.	Drag and Drop: determine native data types available (motif only)
6.	Drag and Drop: determine data types available (win32 only)
7.	Drag and Drop example snippet: define a default operation (in this example, Copy)
8.	Drag and Drop example snippet: define my own data transfer type
9.	Drag and Drop example snippet: drag leaf items in a tree
10.	Drag and Drop example snippet: drag text between two labels

Simple DND (Drag and Drop) Example : Drag Drop « SWT JFace Eclipse « Java

Related examples in the same category