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+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+import com.sun.star.uno.Type;
+import com.sun.star.uno.UnoRuntime;
+import com.sun.star.table.XCell;
+import com.sun.star.util.XModifyListener;
+import com.sun.star.text.XTextRange;
+
+/** a value binding to be connected to a form control
+
+ This binding synchronizes the text contained in a table cell (which you must
+ pass upon construction) to the text in an XBindableValue.
+
+ Well, in real it does not synchronize both directions. The ValueBinding
+ service has not much room for own activity: It allows notification of changes
+ in the own value, and it allows external instances to set the current value.
+
+ Note that we implement this binding as a separate thread, which is (more or
+ less permanently) polling for a new text at the cell. This is unfortunate, but
+ sadly the Writer table cells do not support actively notifying changes in their
+ content to other interested parties.
+*/
+public class TableCellTextBinding
+ extends java.lang.Thread
+ implements com.sun.star.form.binding.XValueBinding,
+ com.sun.star.util.XModifyBroadcaster
+{
+ private XTextRange m_cellText;
+ private Object m_writeSignal;
+ private String m_newCellText;
+ private String m_lastKnownCellText;
+ private boolean m_haveNewCellText;
+ private java.util.List<XModifyListener> m_listeners;
+
+ /** Creates a new instance of TableCellTextBinding */
+ public TableCellTextBinding( XCell cell )
+ {
+ m_cellText = UnoRuntime.queryInterface( XTextRange.class, cell );
+
+ m_newCellText = "";
+ m_listeners = new java.util.LinkedList<XModifyListener>();
+
+ start();
+ }
+
+ /** retrieves the list of data types which this binding can exchange
+ */
+ public com.sun.star.uno.Type[] getSupportedValueTypes()
+ {
+ try
+ {
+ // well, only strings here ...
+ return new Type[] {
+ getStringType()
+ };
+ }
+ catch( java.lang.Exception e )
+ {
+ }
+ return new Type[] { };
+ }
+
+ /** retrieves the current value
+ */
+ public Object getValue(com.sun.star.uno.Type type) throws com.sun.star.form.binding.IncompatibleTypesException
+ {
+ if ( !type.equals( getStringType() ) )
+ throw new com.sun.star.form.binding.IncompatibleTypesException();
+
+ return m_cellText.getString();
+ }
+
+ /** sets a new value
+ */
+ public void setValue(Object obj) throws com.sun.star.form.binding.IncompatibleTypesException
+ {
+ String text;
+ try
+ {
+ text = (String)obj;
+ }
+ catch( java.lang.ClassCastException e )
+ {
+ throw new com.sun.star.form.binding.IncompatibleTypesException();
+ }
+ // remember the new text
+ synchronized( m_newCellText )
+ {
+ m_newCellText = text;
+ m_haveNewCellText = true;
+ }
+ // and wake up the thread which is waiting for it
+ synchronized( m_writeSignal )
+ {
+ m_writeSignal.notify();
+ }
+ }
+
+ /** determines whether a given value type is supported
+ */
+ public boolean supportsType(com.sun.star.uno.Type type)
+ {
+ return type.equals( getStringType() );
+ }
+
+ /** retrieves the UNO type for the string class
+ */
+ private static final Type getStringType()
+ {
+ return new com.sun.star.uno.Type( String.class );
+ }
+
+ /** runs the thread
+ */
+ @Override
+ public void run()
+ {
+ try
+ {
+ m_writeSignal = new Object();
+ while ( true )
+ {
+ // go sleep a while
+ synchronized( m_writeSignal )
+ {
+ m_writeSignal.wait( 200 );
+ }
+
+ // if there's new text in the control, propagate it to the cell
+ synchronized ( m_newCellText )
+ {
+ if ( m_haveNewCellText )
+ {
+ m_cellText.setString( m_newCellText );
+ m_lastKnownCellText = m_newCellText;
+ }
+ m_haveNewCellText = false;
+ }
+
+ // if there's new text in the cell, propagate it to the control
+ String currentCellText = m_cellText.getString();
+ if ( !currentCellText.equals( m_lastKnownCellText ) )
+ {
+ m_lastKnownCellText = currentCellText;
+ // notify the modification
+ synchronized( m_listeners )
+ {
+ com.sun.star.lang.EventObject eventSource = new com.sun.star.lang.EventObject( this );
+
+ java.util.Iterator<XModifyListener> loop = m_listeners.iterator();
+ while ( loop.hasNext() )
+ {
+ loop.next().modified( eventSource );
+ }
+ }
+ }
+ }
+ }
+ catch( java.lang.Exception e )
+ {
+ e.printStackTrace(System.err);
+ }
+ }
+
+ public void addModifyListener(com.sun.star.util.XModifyListener xModifyListener)
+ {
+ synchronized( m_listeners )
+ {
+ m_listeners.add( xModifyListener );
+ }
+ }
+
+ public void removeModifyListener(com.sun.star.util.XModifyListener xModifyListener)
+ {
+ synchronized( m_listeners )
+ {
+ m_listeners.remove( xModifyListener );
+ }
+ }
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */