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| -rw-r--r-- | odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java b/odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java new file mode 100644 index 000000000..23a9e4226 --- /dev/null +++ b/odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java @@ -0,0 +1,199 @@ +/* -*- 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: */ |