Drag and Drop example snippet: define a default operation (in this example, Copy) : 拖放 « SWT-JFace-Eclipse « Java

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Java » SWT-JFace-Eclipse » 拖放屏幕截图 
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)


 
/*
 * 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_DEFAULTevent.detail = DND.DROP_COPY;
    }
    public void dragOperationChanged(DropTargetEvent event) {
      if (event.detail == DND.DROP_DEFAULTevent.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(400400);
  shell.open();
  while (!shell.isDisposed()) {
    if (!display.readAndDispatch())
      display.sleep();
  }
  display.dispose();
}
}


           
       
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