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== 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>

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