Java Tutorial/SWT/Clipboard

Clipboard: enable/disable menu depending on clipboard content availability

   <source lang="java">

/*******************************************************************************

* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*     IBM Corporation - initial API and implementation
*******************************************************************************/

/*

* Clipboard example snippet: enable/disable menu depending on clipboard content availability
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
* 
* @since 3.0
*/

import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.Clipboard; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.dnd.TransferData; import org.eclipse.swt.events.MenuAdapter; import org.eclipse.swt.events.MenuEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.MenuItem; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class MenuDisableEnableClipBoard {

 public static void main(String[] args) {
   Display display = new Display();
   final Clipboard cb = new Clipboard(display);
   Shell shell = new Shell(display);
   shell.setLayout(new FillLayout());
   final Text text = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.WRAP);
   Menu menu = new Menu(shell, SWT.POP_UP);
   final MenuItem copyItem = new MenuItem(menu, SWT.PUSH);
   copyItem.setText("Copy");
   copyItem.addSelectionListener(new SelectionAdapter() {
     public void widgetSelected(SelectionEvent e) {
       String selection = text.getSelectionText();
       if (selection.length() == 0)
         return;
       Object[] data = new Object[] { selection };
       Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
       cb.setContents(data, types);
     }
   });
   final MenuItem pasteItem = new MenuItem(menu, SWT.PUSH);
   pasteItem.setText("Paste");
   pasteItem.addSelectionListener(new SelectionAdapter() {
     public void widgetSelected(SelectionEvent e) {
       String string = (String) (cb.getContents(TextTransfer.getInstance()));
       if (string != null)
         text.insert(string);
     }
   });
   menu.addMenuListener(new MenuAdapter() {
     public void menuShown(MenuEvent e) {
       // is copy valid?
       String selection = text.getSelectionText();
       copyItem.setEnabled(selection.length() > 0);
       // is paste valid?
       TransferData[] available = cb.getAvailableTypes();
       boolean enabled = false;
       for (int i = 0; i < available.length; i++) {
         if (TextTransfer.getInstance().isSupportedType(available[i])) {
           enabled = true;
           break;
         }
       }
       pasteItem.setEnabled(enabled);
     }
   });
   text.setMenu(menu);
   shell.setSize(200, 200);
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch())
       display.sleep();
   }
   cb.dispose();
   display.dispose();
 }

}</source>

Using ClipBoard to copy and paste

   <source lang="java">

import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.Clipboard; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class ClipBoardCopyPaster { public static void main( String[] args) {

 Display display = new Display ();
 final Clipboard cb = new Clipboard(display);
 final Shell shell = new Shell (display);
 final Text text = new Text(shell, SWT.BORDER | SWT.SINGLE);
 text.setBounds(5,5,100,20);
 
 Button copy = new Button(shell, SWT.PUSH);
 copy.setBounds(5,50,100,20);
 copy.setText("Copy");
 copy.addListener (SWT.Selection, new Listener () {
   public void handleEvent (Event e) {
     String textData = text.getSelectionText();
     if (textData.length() > 0) {
       TextTransfer textTransfer = TextTransfer.getInstance();
       cb.setContents(new Object[]{textData}, new Transfer[]{textTransfer});
     }
   }
 });
 
 Button paste = new Button(shell, SWT.PUSH);
 paste.setBounds(5,90,100,20);
 paste.setText("Paste");
 paste.addListener (SWT.Selection, new Listener () {
   public void handleEvent (Event e) {
     TextTransfer transfer = TextTransfer.getInstance();
     String data = (String)cb.getContents(transfer);
     if (data != null) {
       text.insert(data);
     }
   }
 });
 
 shell.setSize(200, 200);
 shell.open();
 while (!shell.isDisposed ()) {
   if (!display.readAndDispatch ()) display.sleep ();
 }
 cb.dispose();
 display.dispose();

} }</source>