Drag and Drop example snippet: define a default operation (in this example, Copy)
/*
* Drag and Drop example snippet: define a default operation (in this example, Copy)
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
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.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Snippet84 {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Label label = new Label(shell, SWT.BORDER);
label.setText("Drag Source");
DragSource source = new DragSource(label, DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK);
source.setTransfer(new Transfer[] {TextTransfer.getInstance()});
source.addDragListener(new DragSourceAdapter() {
public void dragSetData(DragSourceEvent event) {
event.data = "Text Transferred";
}
public void dragFinished(DragSourceEvent event) {
if (event.doit) {
String operation = null;
switch (event.detail) {
case DND.DROP_MOVE:
operation = "moved"; break;
case DND.DROP_COPY:
operation = "copied"; break;
case DND.DROP_LINK:
operation = "linked"; break;
case DND.DROP_NONE:
operation = "disallowed"; break;
default:
operation = "unknown"; break;
}
label.setText("Drag Source (data "+operation+")");
} else {
label.setText("Drag Source (drag cancelled)");
}
}
});
final Text text = new Text(shell, SWT.BORDER | SWT.MULTI);
text.setText("Drop Target");
DropTarget target = new DropTarget(text, DND.DROP_DEFAULT | DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK);
target.setTransfer(new Transfer[] {TextTransfer.getInstance()});
target.addDropListener(new DropTargetAdapter() {
public void dragEnter(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT) event.detail = DND.DROP_COPY;
}
public void dragOperationChanged(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT) event.detail = DND.DROP_COPY;
}
public void drop(DropTargetEvent event) {
String operation = null;
switch (event.detail) {
case DND.DROP_MOVE:
operation = "moved"; break;
case DND.DROP_COPY:
operation = "copied"; break;
case DND.DROP_LINK:
operation = "linked"; break;
case DND.DROP_NONE:
operation = "disallowed"; break;
default:
operation = "unknown"; break;
}
text.append("\n"+operation+(String)event.data);
}
});
shell.setSize(400, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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