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Source Code of ButtonOperator

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// java base stuff
import com.sun.star.awt.ActionEvent;
import com.sun.star.awt.XActionListener;
import com.sun.star.awt.XButton;
import com.sun.star.beans.XPropertySet;
import com.sun.star.form.runtime.FormOperations;
import com.sun.star.form.runtime.XFeatureInvalidation;
import com.sun.star.form.runtime.XFormOperations;
import com.sun.star.lang.EventObject;
import com.sun.star.uno.UnoRuntime;
import com.sun.star.uno.XComponentContext;
import java.util.Vector;


/**************************************************************************/
/** a helper class for operating the buttons
*/
public class ButtonOperator implements XActionListener, XFeatureInvalidation
{
  private XComponentContext  m_componentContext;
  private DocumentHelper    m_aDocument;
    private XPropertySet        m_form;
    private XFormOperations     m_formOperations;

  private Vector        m_aButtons;

  /* ------------------------------------------------------------------ */
  /** ctor
  */
  public ButtonOperator( XComponentContext xCtx, DocumentHelper aDocument, XPropertySet _form )
  {
    m_componentContext = xCtx;
    m_aDocument = aDocument;
        m_form = _form;
    m_aButtons = new Vector();
  }

  /* ------------------------------------------------------------------ */
    private short getAssociatedFormFeature( XPropertySet _buttonModel )
  {
    short formFeature = -1;
    try
    {
            formFeature = Short.valueOf( (String)_buttonModel.getPropertyValue( "Tag" ) );
    }
    catch( com.sun.star.uno.Exception e )
    {
    }
    return formFeature;
  }

  /* ------------------------------------------------------------------ */
  /** get's the button which we operate and which is responsible for a given URL
  */
  private XPropertySet getButton( short _formFeature )
  {
    for ( int i=0; i < m_aButtons.size(); ++i )
    {
            XPropertySet button = (XPropertySet)m_aButtons.elementAt( i );
      if ( _formFeature == getAssociatedFormFeature( button ) )
        return button;
    }
    return null;
  }

  /* ------------------------------------------------------------------ */
  /** announces a button which the operator should be responsible for
  */
  private int getButtonIndex( XPropertySet xButton )
  {
    int nPos = -1;
    for ( int i=0; ( i < m_aButtons.size() ) && ( -1 == nPos ); ++i )
    {
      if ( xButton.equals( m_aButtons.elementAt( i ) ) )
        nPos = i;
    }
    return nPos;
  }

  /* ------------------------------------------------------------------ */
  /** announces a button which the operator should be responsible for
  */
  public void addButton( XPropertySet _buttonModel, short _formFeature  ) throws java.lang.Exception
  {
    // the current view to the document
    DocumentViewHelper aCurrentView = m_aDocument.getCurrentView();

    // add a listener so we get noticed if the user presses the button
    XButton xButtonControl = (XButton)UnoRuntime.queryInterface( XButton.class,
      aCurrentView.getFormControl( _buttonModel ) );
    xButtonControl.addActionListener( this );

        _buttonModel.setPropertyValue( "Tag", String.valueOf( _formFeature ) );

    // remember the button
    m_aButtons.add( _buttonModel );
  }

  /* ------------------------------------------------------------------ */
  public void revokeButton( XPropertySet xButtonModel )
  {
    int nPos = getButtonIndex( xButtonModel );
    if ( -1 < nPos )
    {
      m_aButtons.remove( nPos );
    }
  }

  /* ==================================================================
     = XActionListener
     ================================================================== */
  /* ------------------------------------------------------------------ */
  /* called when a button has been pressed
  */
    public void actionPerformed( ActionEvent aEvent ) throws com.sun.star.uno.RuntimeException
  {
    // get the model's name
        XPropertySet buttonModel = (XPropertySet)FLTools.getModel( aEvent.Source, XPropertySet.class );
        try
        {
            short formFeature = getAssociatedFormFeature( buttonModel );
            if ( formFeature != -1 )
                m_formOperations.execute( formFeature );
        }
        catch( final com.sun.star.uno.Exception e )
        {
        }
  }

  /* ------------------------------------------------------------------ */
  /* (to be) called when the form layer has been switched to alive mode
     * @todo
     *  register as listener somewhere ...
  */
    public void onFormsAlive()
    {
        try
        {
            m_formOperations = FormOperations.createWithFormController(
                m_componentContext, m_aDocument.getCurrentView().getFormController( m_form ) );
            m_formOperations.setFeatureInvalidation( this );
            invalidateAllFeatures();
        }
        catch( final com.sun.star.uno.Exception e )
        {
        }
    }

  /* ==================================================================
     = XEventListener
     ================================================================== */
  public void disposing( EventObject aEvent )
  {
    // not interested in
  }

  /* ==================================================================
     = XFeatureInvalidation
     ================================================================== */
    private void updateButtonState( XPropertySet _buttonModel, short _formFeature )
    {
        try
        {
            _buttonModel.setPropertyValue( "Enabled", m_formOperations.isEnabled( _formFeature ) );
        }
        catch( com.sun.star.uno.Exception e )
        {
        }
    }

    public void invalidateFeatures( short[] _features ) throws com.sun.star.uno.RuntimeException
    {
        for ( int i=0; i<_features.length; ++i )
        {
            XPropertySet buttonModel = getButton( _features[i] );
            if ( buttonModel != null )
                updateButtonState( buttonModel, _features[i] );
        }
    }

    public void invalidateAllFeatures() throws com.sun.star.uno.RuntimeException
    {
    for ( int i=0; i < m_aButtons.size(); ++i )
    {
            XPropertySet buttonModel = (XPropertySet)m_aButtons.elementAt( i );
            updateButtonState( buttonModel, getAssociatedFormFeature( buttonModel ) );
    }
    }
};
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