/*
* This library is part of the Acacia Editor -
* an open source inline and form based content editor for GWT.
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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 for more details.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.alkacon.acacia.client;
import com.alkacon.acacia.client.css.I_LayoutBundle;
import com.alkacon.acacia.client.ui.AttributeValueView;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseDownHandler;
import com.google.gwt.event.dom.client.MouseOutEvent;
import com.google.gwt.event.dom.client.MouseOutHandler;
import com.google.gwt.event.dom.client.MouseOverEvent;
import com.google.gwt.event.dom.client.MouseOverHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
/**
* The attribute value view highlighting handler.<p>
*/
public class ValueFocusHandler implements MouseOverHandler, MouseOutHandler, MouseDownHandler {
/** The handler instance. */
private static ValueFocusHandler INSTANCE;
/** The on button hover highlighted element. */
private AttributeValueView m_currentButtonFocus;
/** The currently selected value view. */
private AttributeValueView m_currentFocus;
/** The handler registration. */
private HandlerRegistration m_handlerRegistration;
/**
* Constructor.<p>
*/
private ValueFocusHandler() {
m_handlerRegistration = RootPanel.get().addDomHandler(this, MouseDownEvent.getType());
}
/**
* Returns the highlighting handler instance.<p>
*
* @return the highlighting handler instance
*/
public static ValueFocusHandler getInstance() {
if (INSTANCE == null) {
INSTANCE = new ValueFocusHandler();
}
return INSTANCE;
}
/**
* Clears the static instance reference.<p>
*/
private static void clearInstance() {
INSTANCE = null;
}
/**
* Removes all focus highlighting.<p>
*/
public void clearFocus() {
if ((m_currentFocus != null)) {
m_currentFocus.toggleFocus(false);
m_currentFocus = null;
}
}
/**
* Destroys the current handler instance.<p>
*/
public void destroy() {
m_currentFocus = null;
if (m_handlerRegistration != null) {
m_handlerRegistration.removeHandler();
}
m_handlerRegistration = null;
clearInstance();
}
/**
* Hides all help bubbles.<p>
*
* @param formPanel the form panel
* @param hide <code>true</code> to hide the help bubbles
*/
public void hideHelpBubbles(Widget formPanel, boolean hide) {
if (hide) {
formPanel.addStyleName(I_LayoutBundle.INSTANCE.form().hideHelpBubbles());
} else {
formPanel.removeStyleName(I_LayoutBundle.INSTANCE.form().hideHelpBubbles());
}
}
/**
* @see com.google.gwt.event.dom.client.MouseDownHandler#onMouseDown(com.google.gwt.event.dom.client.MouseDownEvent)
*/
public void onMouseDown(MouseDownEvent event) {
event.stopPropagation();
if (RootPanel.get().equals(event.getSource())) {
com.google.gwt.dom.client.Element element = com.google.gwt.dom.client.Element.as(event.getNativeEvent().getEventTarget());
if ((m_currentFocus != null) && !m_currentFocus.owns(element)) {
m_currentFocus.toggleFocus(false);
m_currentFocus = null;
}
} else {
if (event.getSource().equals(m_currentFocus)) {
return;
}
if ((m_currentFocus != null)) {
m_currentFocus.toggleFocus(false);
}
m_currentFocus = (AttributeValueView)event.getSource();
m_currentFocus.toggleFocus(true);
}
}
/**
* @see com.google.gwt.event.dom.client.MouseOutHandler#onMouseOut(com.google.gwt.event.dom.client.MouseOutEvent)
*/
public void onMouseOut(MouseOutEvent event) {
if (!(event.getSource() instanceof AttributeValueView)) {
if ((m_currentButtonFocus != null)
&& m_currentButtonFocus.getElement().isOrHasChild(((Widget)event.getSource()).getElement())) {
if (!m_currentButtonFocus.equals(m_currentFocus)) {
m_currentButtonFocus.toggleFocus(false);
}
m_currentButtonFocus = null;
}
return;
}
}
/**
* @see com.google.gwt.event.dom.client.MouseOverHandler#onMouseOver(com.google.gwt.event.dom.client.MouseOverEvent)
*/
public void onMouseOver(MouseOverEvent event) {
if (!(event.getSource() instanceof AttributeValueView)) {
AttributeValueView parentView = null;
Widget source = ((Widget)event.getSource()).getParent();
while (parentView == null) {
if (source instanceof AttributeValueView) {
parentView = (AttributeValueView)source;
} else {
source = source.getParent();
}
}
if (m_currentButtonFocus != null) {
if (m_currentButtonFocus.equals(parentView)) {
return;
} else if (!m_currentButtonFocus.equals(m_currentFocus)) {
m_currentButtonFocus.toggleFocus(false);
}
}
m_currentButtonFocus = parentView;
m_currentButtonFocus.toggleFocus(true);
return;
}
}
/**
* Sets the given attribute value view focused.<p>
*
* @param target the target attribute value view
*/
public void setFocus(AttributeValueView target) {
if (m_currentFocus == target) {
return;
}
if ((m_currentFocus != null)) {
m_currentFocus.toggleFocus(false);
}
m_currentFocus = target;
m_currentFocus.toggleFocus(true);
}
}