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/******************************************************************************* |
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* Copyright (c) 2005 IBM Corporation and others. |
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* All rights reserved. This program and the accompanying materials |
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* are made available under the terms of the Eclipse Public License v1.0 |
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* which accompanies this distribution, and is available at |
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* http://www.eclipse.org/legal/epl-v10.html |
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* |
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* Contributors: |
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* IBM Corporation - initial API and implementation |
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*******************************************************************************/ |
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package org.eclipse.jface.internal.databinding.swt; |
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|
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import org.eclipse.jface.internal.provisional.databinding.ChangeEvent; |
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import org.eclipse.jface.internal.provisional.databinding.UpdatableValue; |
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import org.eclipse.swt.SWT; |
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import org.eclipse.swt.custom.StyledText; |
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import org.eclipse.swt.events.KeyEvent; |
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import org.eclipse.swt.events.KeyListener; |
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import org.eclipse.swt.events.VerifyEvent; |
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import org.eclipse.swt.events.VerifyListener; |
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import org.eclipse.swt.widgets.Event; |
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import org.eclipse.swt.widgets.Listener; |
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|
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/** |
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* @since 3.2 |
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* |
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*/ |
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public class StyledTextUpdatableValue extends UpdatableValue { |
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|
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private final StyledText text; |
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|
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private boolean updating = false; |
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|
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private int updatePolicy; |
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|
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private String bufferedValue; |
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|
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private Listener validateListener = new Listener() { |
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public void handleEvent(Event event) { |
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if (!updating) { |
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fireChangeEvent(ChangeEvent.CHANGE, null, text.getText()); |
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} |
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} |
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}; |
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|
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private Listener updateListener = new Listener() { |
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public void handleEvent(Event event) { |
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if (!updating) { |
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String oldValue = bufferedValue; |
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String newValue = text.getText(); |
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|
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// If we are updating on focus lost then when we fire the change event change the buffered value |
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if (updatePolicy == SWT.FocusOut){ |
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bufferedValue = text.getText(); |
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if (!oldValue.equals(newValue)) { |
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fireChangeEvent(ChangeEvent.CHANGE, null, text.getText()); |
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} |
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} else { |
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fireChangeEvent(ChangeEvent.CHANGE, null, text.getText()); |
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} |
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} |
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} |
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}; |
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|
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private VerifyListener verifyListener; |
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|
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private KeyListener keyListener; |
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|
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/** |
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* @param text |
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* @param updatePolicy |
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*/ |
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public StyledTextUpdatableValue(final StyledText text, int updatePolicy) { |
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this.text = text; |
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this.updatePolicy = updatePolicy; |
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if (updatePolicy != SWT.None) { |
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text.addListener(updatePolicy, updateListener); |
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} |
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// If the update policy is TIME_EARLY then the model is notified of changed on key stroke by key stroke |
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// When escape is pressed we need to rollback to the previous value which is done with a key listener, however |
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// the bufferedValue (the last remembered change value) must be changed on focus lost |
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if(updatePolicy == SWT.Modify){ |
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text.addListener(SWT.FocusOut, new Listener(){ |
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public void handleEvent(Event event){ |
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if(!updating){ |
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bufferedValue = text.getText(); |
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} |
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} |
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}); |
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} |
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verifyListener = new VerifyListener() { |
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public void verifyText(VerifyEvent e) { |
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if (!updating) { |
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String currentText = StyledTextUpdatableValue.this.text.getText(); |
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String newText = currentText.substring(0, e.start) + e.text |
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+ currentText.substring(e.end); |
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ChangeEvent changeEvent = fireChangeEvent( |
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ChangeEvent.VERIFY, currentText, newText); |
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if (changeEvent.getVeto()) { |
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e.doit = false; |
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} |
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} |
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} |
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}; |
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text.addVerifyListener(verifyListener); |
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keyListener = new KeyListener(){ |
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public void keyPressed(KeyEvent e) { |
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if(e.character == SWT.ESC && bufferedValue != null){ |
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// Revert the value in the text field to the model value |
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text.setText(bufferedValue); |
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} |
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} |
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public void keyReleased(KeyEvent e) { |
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} |
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}; |
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text.addKeyListener(keyListener); |
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} |
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|
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public void setValue(final Object value) { |
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|
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AsyncRunnable runnable = new AsyncRunnable(){ |
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public void run(){ |
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String oldValue = text.getText(); |
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try { |
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updating = true; |
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bufferedValue = (String)value; |
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text.setText(value == null ? "" : value.toString()); //$NON-NLS-1$ |
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} finally { |
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updating = false; |
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} |
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fireChangeEvent(ChangeEvent.CHANGE, oldValue, text.getText()); |
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} |
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}; |
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runnable.runOn(text.getDisplay()); |
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} |
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|
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public Object computeValue() { |
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SyncRunnable runnable = new SyncRunnable(){ |
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public Object run() { |
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return text.getText(); |
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} |
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}; |
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return runnable.runOn(text.getDisplay()); |
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} |
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|
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public Class getValueType() { |
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return String.class; |
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} |
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|
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public void dispose() { |
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if (!text.isDisposed()) { |
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if (updatePolicy != SWT.None) { |
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text.removeListener(updatePolicy, updateListener); |
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} |
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text.removeVerifyListener(verifyListener); |
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} |
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super.dispose(); |
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} |
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} |