Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2014, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jfreechart/index.html * * 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. * * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners.] * * --------------------- * TooltipHandlerFX.java * --------------------- * (C) Copyright 2014, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * Changes: * -------- * 25-Jun-2014 : Version 1 (DG); * */ package de.hs.mannheim.modUro.controller.diagram.fx.interaction; import de.hs.mannheim.modUro.controller.diagram.fx.ChartCanvas; import javafx.scene.input.MouseEvent; import org.jfree.chart.ChartRenderingInfo; import org.jfree.chart.entity.ChartEntity; import org.jfree.chart.entity.EntityCollection; /** * Handles the updating of tooltips on a {@link ChartCanvas}. * * <p>THE API FOR THIS CLASS IS SUBJECT TO CHANGE IN FUTURE RELEASES. This is * so that we can incorporate feedback on the (new) JavaFX support in * JFreeChart.</p> * * @since 1.0.18 */ public class TooltipHandlerFX extends AbstractMouseHandlerFX implements MouseHandlerFX { /** * Creates a new instance with the specified ID. * * @param id the handler id (<code>null</code> not permitted). */ public TooltipHandlerFX(String id) { super(id, false, false, false, false); } /** * Handles a mouse moved event by updating the tooltip. * * @param canvas the chart canvas (<code>null</code> not permitted). * @param e the mouse event. */ @Override public void handleMouseMoved(ChartCanvas canvas, MouseEvent e) { if (!canvas.isTooltipEnabled()) { return; } String text = getTooltipText(canvas, e.getX(), e.getY()); canvas.setTooltip(text, e.getScreenX(), e.getScreenY()); } /** * Returns the tooltip text. * * @param canvas the canvas that is displaying the chart. * @param x the x-coordinate of the mouse pointer. * @param y the y-coordinate of the mouse pointer. * * @return String The tooltip text (possibly <code>null</code>). */ private String getTooltipText(ChartCanvas canvas, double x, double y) { ChartRenderingInfo info = canvas.getRenderingInfo(); if (info == null) { return null; } EntityCollection entities = info.getEntityCollection(); if (entities == null) { return null; } ChartEntity entity = entities.getEntity(x, y); if (entity == null) { return null; } return entity.getToolTipText(); } }