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+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * The Contents of this file are made available subject to the terms of
+ * the BSD license.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Sun Microsystems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *************************************************************************/
+
+import com.sun.star.uno.*;
+import com.sun.star.lang.*;
+import com.sun.star.container.*;
+import com.sun.star.beans.*;
+import com.sun.star.form.*;
+import com.sun.star.sdbc.*;
+
+
+/**************************************************************************/
+/** A helper class for recursively locking control models which are bound
+ to a specific field
+*/
+
+class LockControlModels extends ComponentTreeTraversal
+{
+ private String m_sDataField;
+ private Boolean m_aLockIt;
+ private int m_nLevel; // nesting level relative to the form we started with
+
+ /* ------------------------------------------------------------------ */
+ public LockControlModels( String sDataField, boolean bLockIt )
+ {
+ m_sDataField = sDataField;
+ m_aLockIt = Boolean.valueOf( bLockIt );
+ m_nLevel = 0;
+ }
+
+ /* ------------------------------------------------------------------ */
+ @Override
+ protected boolean shouldStepInto( XIndexContainer xContainer )
+ {
+ if ( !super.shouldStepInto( xContainer ) )
+ return false; // don't try to be more clever than our base class
+
+ XForm xForm = UnoRuntime.queryInterface( XForm.class, xContainer );
+ if ( ( null != xForm ) && ( m_nLevel > 1 ) )
+ // don't step into sub forms - we only handle the form we were originally
+ // applied to
+ return false;
+
+ return true;
+ }
+
+ /* ------------------------------------------------------------------ */
+ @Override
+ public void handle( Object aFormComponent ) throws com.sun.star.uno.Exception
+ {
+ // entering this nesting level
+ ++m_nLevel;
+
+ // check if the component has a DataField property
+ XPropertySet xCompProps = UNO.queryPropertySet( aFormComponent );
+ XPropertySetInfo xPSI = null;
+ if ( null != xCompProps )
+ xPSI = xCompProps.getPropertySetInfo();
+
+ if ( ( null != xPSI ) && xPSI.hasPropertyByName( "DataField" ) )
+ { // indeed it has...
+ String sDataField = (String)xCompProps.getPropertyValue( "DataField" );
+ if ( sDataField.equals( m_sDataField ) )
+ { // we found a control model which is bound to what we're looking for
+ xCompProps.setPropertyValue( "ReadOnly", m_aLockIt );
+ }
+ }
+
+ // allow the super class to step down, if possible
+ super.handle( aFormComponent );
+
+ // leaving this nesting level
+ --m_nLevel;
+ }
+}
+
+/**************************************************************************/
+/** a class which automatically handles control locking.
+ <p>The class has to be bound to a form. Upon every movement of the form,
+ all controls which are bound to a (to be specified) field are locked
+ on existing and unlocked on new records.</p>
+*/
+class ControlLock implements XRowSetListener
+{
+ private XPropertySet m_xForm;
+ private String m_sDataField;
+ private boolean m_bLockingEnabled;
+ private boolean m_bPreviousRoundLock;
+
+ /* ------------------------------------------------------------------ */
+ ControlLock( XPropertySet xForm, String sBoundDataField )
+ {
+ m_xForm = xForm;
+ m_sDataField = sBoundDataField;
+ m_bLockingEnabled = false;
+ m_bPreviousRoundLock = false;
+ }
+
+ /* ------------------------------------------------------------------ */
+ /** updates the locks on the affected controls
+ */
+ private void updateLocks( )
+ {
+ try
+ {
+ // first determine if we need to lock
+ Boolean aIsNewRecord = (Boolean)m_xForm.getPropertyValue( "IsNew" );
+
+ boolean bNeedLock = m_bLockingEnabled && !aIsNewRecord.booleanValue();
+
+ if ( m_bPreviousRoundLock != bNeedLock )
+ {
+ LockControlModels aLocker = new LockControlModels( m_sDataField, bNeedLock );
+ aLocker.handle( m_xForm );
+ m_bPreviousRoundLock = bNeedLock;
+ }
+
+ // please note that we choose the expensive way here: We always loop through
+ // _all_ control models belonging to the form. This clearly slows down the
+ // whole process.
+ // A better solution would be to cache the affected control models. Then we
+ // could either rely on the fact that the model hierarchy is static, or we
+ // could add ourself as container listener to the form.
+ }
+ catch(com.sun.star.uno.Exception e)
+ {
+ System.out.println(e);
+ e.printStackTrace();
+ }
+ }
+
+ /* ------------------------------------------------------------------ */
+ /** enables the locking in general
+ <p>If the control models are really locked depends on the current
+ record of the form: on the insert row, controls are never locked.</p>
+ */
+ public void enableLock( boolean bLock )
+ {
+ // remember this new setting
+ m_bLockingEnabled = bLock;
+
+ // add or remove ourself as listener to get notified of cursor moves
+ XRowSet xRowSet = UnoRuntime.queryInterface(
+ XRowSet.class, m_xForm );
+ if ( m_bLockingEnabled )
+ {
+ xRowSet.addRowSetListener( this );
+ }
+ else
+ {
+ xRowSet.removeRowSetListener( this );
+ }
+
+ // update the locks
+ updateLocks();
+ }
+
+ /* ==================================================================
+ = UNO callbacks
+ ================================================================== */
+
+ /* ------------------------------------------------------------------ */
+ // XResetListener overridables
+ /* ------------------------------------------------------------------ */
+ public void cursorMoved( EventObject aEvent ) throws com.sun.star.uno.RuntimeException
+ {
+ updateLocks( );
+ }
+
+ /* ------------------------------------------------------------------ */
+ public void rowChanged( EventObject aEvent ) throws com.sun.star.uno.RuntimeException
+ {
+ // not interested in
+ }
+
+ /* ------------------------------------------------------------------ */
+ public void rowSetChanged( EventObject aEvent ) throws com.sun.star.uno.RuntimeException
+ {
+ // not interested in
+ }
+
+ /* ------------------------------------------------------------------ */
+ // XEventListener overridables
+ /* ------------------------------------------------------------------ */
+ public void disposing( EventObject aEvent )
+ {
+ // not interested in
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */