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/*******************************************************************************
* Copyright (c) 2007-2013 THALES GLOBAL SERVICES.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.sirius.editor.utils;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Text;
import org.eclipse.sirius.ui.tools.api.assist.TextChangeListener;
/**
* TextChangeHelper notifies the listener of text lifecycle events on behalf of
* the widget(s) it listens to.
*/
public abstract class TextChangeHelper implements TextChangeListener {
protected boolean notifyOnCarriageReturn = true;
public TextChangeHelper() {
}
public TextChangeHelper(boolean notifyOnCarriageReturn) {
this.notifyOnCarriageReturn = notifyOnCarriageReturn;
}
/**
* @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
*/
public void handleEvent(Event event) {
switch (event.type) {
case SWT.KeyDown:
if (event.character == SWT.CR && notifyOnCarriageReturn)
textChanged((Text) event.widget);
break;
case SWT.FocusOut:
textChanged((Text) event.widget);
break;
default:
break;
}
}
/**
* Abstract method notified when a text field has been changed.
*
* @param control
* the given control.
*/
public abstract void textChanged(Text control);
/**
* Registers this helper with the given control to listen for events which
* indicate that a change is in progress (or done).
*
* @param control
* the given control.
*/
public void startListeningTo(Text control) {
control.addListener(SWT.FocusOut, this);
control.addListener(SWT.Modify, this);
}
/**
* Registers this helper with the given control to listen for the Enter key.
* When Enter is pressed, the change is considered done (this is only
* appropriate for single-line Text widgets).
*
* @param control
* the given control.
*/
public void startListeningForEnter(Text control) {
// NOTE: KeyDown rather than KeyUp, because of similar usage in CCombo.
control.addListener(SWT.KeyDown, this);
}
/**
* Unregisters this helper from a control previously passed to
* startListeningTo() and/or startListeningForEnter().
*
* @param control
* the given control.
*/
public void stopListeningTo(Text control) {
if ((control != null) && !control.isDisposed()) {
control.removeListener(SWT.FocusOut, this);
control.removeListener(SWT.Modify, this);
control.removeListener(SWT.KeyDown, this);
}
}
}
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