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Diffstat (limited to 'odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java')
| -rw-r--r-- | odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java b/odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java new file mode 100644 index 000000000000..40bd460ad2b8 --- /dev/null +++ b/odk/examples/DevelopersGuide/Forms/TableCellTextBinding.java @@ -0,0 +1,210 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ +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.beans.XPropertySet; +import com.sun.star.text.XTextRange; +import com.sun.star.form.binding.IncompatibleTypesException; + +/** 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 m_listeners; + + /** Creates a new instance of TableCellTextBinding */ + public TableCellTextBinding( XCell cell ) + { + m_cellText = (XTextRange)UnoRuntime.queryInterface( XTextRange.class, cell ); + + m_newCellText = new String(); + m_listeners = new java.util.LinkedList(); + + 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 + */ + 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 loop = m_listeners.iterator(); + while ( loop.hasNext() ) + { + ((XModifyListener)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 ); + } + } + + public void disposing(com.sun.star.lang.EventObject eventObject) + { + // not interested in + } +} |