/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* 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
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* 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 org.opencms.gwt.client.util;
import org.opencms.gwt.client.ui.css.I_CmsLayoutBundle;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.HasAllMouseHandlers;
import com.google.gwt.event.dom.client.MouseMoveEvent;
import com.google.gwt.event.dom.client.MouseMoveHandler;
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.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.RootPanel;
/**
* A tool-tip handler. Allowing to show any HTML as a tool-tip on mouse over.<p>
*
* @since 8.0.0
*/
public class CmsToolTipHandler implements MouseOverHandler, MouseMoveHandler, MouseOutHandler {
/** The default tool-tip left offset. */
private static final int DEFAULT_OFFSET_LEFT = 10;
/** The default tool-tip top offset. */
private static final int DEFAULT_OFFSET_TOP = 10;
/** The mouse move handler registration. */
private HandlerRegistration m_moveHandlerRegistration;
/** The tool-tip left offset. */
private int m_offsetLeft;
/** The tool-tip top offset. */
private int m_offsetTop;
/** The mouse out handler registration. */
private HandlerRegistration m_outHandlerRegistration;
/** The mouse over handler registration. */
private HandlerRegistration m_overHandlerRegistration;
/** Flag indicating if the tool-tip is currently showing. */
private boolean m_showing;
/** The widget to show the tool-tip for. */
private HasAllMouseHandlers m_target;
/** The tool-tip element. */
private Element m_toolTip;
/** The tool-tip HTML to show. */
private String m_toolTipHtml;
private Timer m_removeTimer;
private static final int REMOVE_SCHEDULE = 10000;
/**
* Constructor. Adds the tool-tip handler to the target.<p>
*
* @param target the target to show the tool-tip on
* @param toolTipHtml the tool-tip content
*/
public CmsToolTipHandler(HasAllMouseHandlers target, String toolTipHtml) {
m_target = target;
m_toolTipHtml = toolTipHtml;
m_offsetLeft = DEFAULT_OFFSET_LEFT;
m_offsetTop = DEFAULT_OFFSET_TOP;
m_overHandlerRegistration = m_target.addMouseOverHandler(this);
}
/**
* Returns the tool-tip HTML.<p>
*
* @return the tool-tip HTML
*/
public String getToolTipHtml() {
return m_toolTipHtml;
}
/**
* Returns if the tool-tip is showing.<p>
*
* @return <code>true</code> if the tool-tip is showing
*/
public boolean isShowing() {
return m_showing;
}
/**
* @see com.google.gwt.event.dom.client.MouseMoveHandler#onMouseMove(com.google.gwt.event.dom.client.MouseMoveEvent)
*/
public void onMouseMove(MouseMoveEvent event) {
m_removeTimer.schedule(REMOVE_SCHEDULE);
setToolTipPosition(event.getClientX(), event.getClientY());
}
/**
* @see com.google.gwt.event.dom.client.MouseOutHandler#onMouseOut(com.google.gwt.event.dom.client.MouseOutEvent)
*/
public void onMouseOut(MouseOutEvent event) {
if (m_removeTimer != null) {
m_removeTimer.cancel();
}
clearShowing();
}
/**
* @see com.google.gwt.event.dom.client.MouseOverHandler#onMouseOver(com.google.gwt.event.dom.client.MouseOverEvent)
*/
public void onMouseOver(MouseOverEvent event) {
// make sure not to double assign any handlers
if (m_removeTimer != null) {
m_removeTimer.cancel();
}
clearShowing();
createTimer();
m_removeTimer.schedule(REMOVE_SCHEDULE);
m_showing = true;
m_moveHandlerRegistration = m_target.addMouseMoveHandler(this);
m_outHandlerRegistration = m_target.addMouseOutHandler(this);
if (m_toolTip == null) {
m_toolTip = DOM.createDiv();
m_toolTip.addClassName(I_CmsLayoutBundle.INSTANCE.generalCss().toolTip());
m_toolTip.addClassName(I_CmsLayoutBundle.INSTANCE.generalCss().cornerAll());
}
m_toolTip.setInnerHTML(m_toolTipHtml);
RootPanel.getBodyElement().appendChild(m_toolTip);
setToolTipPosition(event.getClientX(), event.getClientY());
}
/**
* Removes this tool-tip handler completely. This instance will not be reusable.<p>
*/
public void removeHandler() {
clearShowing();
if (m_overHandlerRegistration != null) {
m_overHandlerRegistration.removeHandler();
m_overHandlerRegistration = null;
}
m_target = null;
}
/**
* Sets the tool-tip left offset.<p>
*
* @param offsetLeft the tool-tip left offset to set
*/
public void setOffsetLeft(int offsetLeft) {
m_offsetLeft = offsetLeft;
}
/**
* Sets the tool-tip top offset.<p>
*
* @param offsetTop the tool-tip top offset to set
*/
public void setOffsetTop(int offsetTop) {
m_offsetTop = offsetTop;
}
/**
* Sets the tool-tip HTML.<p>
*
* @param toolTipHtml the tool-tip HTML to set
*/
public void setToolTipHtml(String toolTipHtml) {
m_toolTipHtml = toolTipHtml;
if (m_showing) {
m_toolTip.setInnerHTML(toolTipHtml);
}
}
/**
* Removes the tool-tip and mouse move and out handlers.<p>
*/
public void clearShowing() {
m_showing = false;
if (m_toolTip != null) {
m_toolTip.removeFromParent();
m_toolTip = null;
}
if (m_moveHandlerRegistration != null) {
m_moveHandlerRegistration.removeHandler();
m_moveHandlerRegistration = null;
}
if (m_outHandlerRegistration != null) {
m_outHandlerRegistration.removeHandler();
m_outHandlerRegistration = null;
}
m_removeTimer = null;
}
private void createTimer() {
m_removeTimer = new Timer() {
/**
* @see com.google.gwt.user.client.Timer#run()
*/
@Override
public void run() {
clearShowing();
}
};
}
/**
* Sets the tool-tip position.<p>
*
* @param absLeft the mouse pointer absolute left
* @param absTop the mouse pointer absolute top
*/
private void setToolTipPosition(int absLeft, int absTop) {
if (m_toolTip != null) {
int height = m_toolTip.getOffsetHeight();
int width = m_toolTip.getOffsetWidth();
int windowHeight = Window.getClientHeight();
int windowWidth = Window.getClientWidth();
int left = absLeft + m_offsetLeft;
if ((left + width) > windowWidth) {
left = windowWidth - m_offsetLeft - width;
}
m_toolTip.getStyle().setLeft(left, Unit.PX);
int top = absTop + m_offsetTop;
if (((top + height) > windowHeight) && ((height + m_offsetTop) < absTop)) {
top = absTop - m_offsetTop - height;
}
m_toolTip.getStyle().setTop(top, Unit.PX);
}
}
}