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Java » SWT JFace Eclipse » ClipboardScreenshots 
Enable/disable menu depending on clipboard content availability
Enable/disable menu depending on clipboard content availability



/*
 * Clipboard example snippet: enable/disable menu depending on clipboard content availability
 *
 * 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.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 Snippet122 {

  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(200200);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    cb.dispose();
    display.dispose();
  }
}

           
       
Related examples in the same category
1. Copy and PasteCopy and Paste
2. SWT Clipboard ExampleSWT Clipboard Example
3. Clipboard Composite
4. Copy and paste data with the clipboardCopy and paste data with the clipboard
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