Illustrates dragging : Drag Drop « SWT JFace Eclipse « Java
Illustrates dragging
//Send questions, comments, bug reports, etc. to the authors:
//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)
import org.eclipse.swt.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* This program illustrates dragging
*/
public class SnippetBoard {
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
private void createContents(Shell shell) {
shell.setLayout(new FillLayout());
Table table = new Table(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
// Create the types
Transfer[] types = new Transfer[] { TextTransfer.getInstance()};
// Create the drag source
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();
// Create a buffer to hold the selected items and fill it
StringBuffer buff = new StringBuffer();
for (int i = 0, n = selection.length; i < n; i++) {
buff.append(selection[i].getText());
}
// Put the data into the event
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) {
// Provide visual feedback
event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
}
public void drop(DropTargetEvent event) {
// If any text was dropped . . .
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[] { "private static final int"});
item = new TableItem(table, SWT.NONE);
item.setText(new String[] { "String"});
item = new TableItem(table, SWT.BORDER);
item.setText(new String[] { "private static void main(String[] args) {"});
column.pack();
}
/**
* The application entry point
* @param args the command line arguments
*/
public static void main(String[] args) {
new SnippetBoard().run();
}
}
