Java tutorial
/* * This program is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software * Foundation. * * You should have received a copy of the GNU Lesser General Public License along with this * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html * or from the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * This program 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. * * Copyright (c) 2006 - 2017 Hitachi Vantara and Contributors. All rights reserved. */ package org.pentaho.reporting.engine.classic.demo.util; import java.awt.BorderLayout; import java.awt.Container; import java.awt.Dimension; import java.io.IOException; import java.net.URL; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JEditorPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTree; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.TreePath; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.pentaho.reporting.libraries.base.util.ObjectUtilities; /** * The CompoundDemoFrame provides a unified GUI which is able to present more than one demo. The Demos are selectable * using a JTree component. * * @author Thomas Morgner */ public class CompoundDemoFrame extends AbstractDemoFrame { private static final Log logger = LogFactory.getLog(CompoundDemoFrame.class); private class TreeSelectionHandler implements TreeSelectionListener { public TreeSelectionHandler() { } public void valueChanged(TreeSelectionEvent e) { final TreePath treePath = e.getNewLeadSelectionPath(); if (treePath == null) { setSelectedHandler(null); } else { final Object o = treePath.getLastPathComponent(); if (o instanceof DemoHandlerTreeNode) { DemoHandlerTreeNode handlerNode = (DemoHandlerTreeNode) o; DemoHandler handler = handlerNode.getHandler(); setSelectedHandler(handler); } else { setSelectedHandler(null); } } } } private DemoHandler selectedHandler; private DemoSelector demoSelector; private JPanel demoContent; private JComponent externalHandlerArea; public CompoundDemoFrame(final DemoSelector demoSelector) { this.demoSelector = demoSelector; } public DemoSelector getDemoSelector() { return demoSelector; } protected void init() { setTitle(demoSelector.getName()); setJMenuBar(createMenuBar()); setContentPane(createDefaultContentPane()); } protected void setSelectedHandler(final DemoHandler handler) { selectedHandler = handler; demoContent.removeAll(); if (handler instanceof InternalDemoHandler) { demoContent.add(createDefaultDemoPane((InternalDemoHandler) handler)); getPreviewAction().setEnabled(true); } else if (handler != null) { demoContent.add(getExternalHandlerInfoPane()); getPreviewAction().setEnabled(true); } else { demoContent.add(getNoHandlerInfoPane()); getPreviewAction().setEnabled(false); } demoContent.revalidate(); } protected JComponent getExternalHandlerInfoPane() { if (externalHandlerArea == null) { final JPanel content = new JPanel(new BorderLayout()); content.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4)); final URL url = ObjectUtilities.getResource( "org/pentaho/reporting/engine/classic/demo/resources/external-handler-info.html", CompoundDemoFrame.class); final JComponent scroll = createDescriptionTextPane(url); final JButton previewButton = new JButton(getPreviewAction()); content.add(scroll, BorderLayout.CENTER); content.add(previewButton, BorderLayout.SOUTH); externalHandlerArea = content; } return externalHandlerArea; } protected JComponent createDescriptionTextPane(final URL url) { final JEditorPane editorPane = new JEditorPane(); editorPane.setEditable(false); editorPane.setPreferredSize(new Dimension(400, 200)); if (url != null) { try { editorPane.setPage(url); } catch (IOException e) { logger.error("Failed to load demo description", e); editorPane.setText("Unable to load the demo description. Error: " + e.getMessage()); } } else { editorPane.setText("Unable to load the demo description. No such resource."); } return new JScrollPane(editorPane, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); } protected JComponent getNoHandlerInfoPane() { return new JPanel(); } public DemoHandler getSelectedHandler() { return selectedHandler; } protected Container createDefaultContentPane() { demoContent = new JPanel(); demoContent.setLayout(new BorderLayout()); demoContent.setMinimumSize(new Dimension(100, 100)); demoContent.add(getNoHandlerInfoPane(), BorderLayout.CENTER); JPanel placeHolder = new JPanel(); placeHolder.setMinimumSize(new Dimension(300, 0)); placeHolder.setPreferredSize(new Dimension(300, 0)); placeHolder.setMaximumSize(new Dimension(300, 0)); JPanel rootContent = new JPanel(); rootContent.setLayout(new BorderLayout()); rootContent.add(demoContent, BorderLayout.CENTER); rootContent.add(placeHolder, BorderLayout.NORTH); final DemoSelectorTreeNode root = new DemoSelectorTreeNode(null, demoSelector); final DefaultTreeModel model = new DefaultTreeModel(root); final JTree demoTree = new JTree(model); demoTree.addTreeSelectionListener(new TreeSelectionHandler()); JSplitPane rootSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, new JScrollPane(demoTree), rootContent); rootSplitPane.setContinuousLayout(true); rootSplitPane.setDividerLocation(200); rootSplitPane.setOneTouchExpandable(true); return rootSplitPane; } protected JComponent createDefaultDemoPane(final InternalDemoHandler demoHandler) { final JPanel content = new JPanel(new BorderLayout()); content.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4)); final URL url = demoHandler.getDemoDescriptionSource(); final JComponent scroll = createDescriptionTextPane(url); final JButton previewButton = new JButton(getPreviewAction()); final JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT); splitPane.setTopComponent(scroll); splitPane.setBottomComponent(demoHandler.getPresentationComponent()); splitPane.setDividerLocation(200); splitPane.setOneTouchExpandable(true); content.add(splitPane, BorderLayout.CENTER); content.add(previewButton, BorderLayout.SOUTH); return content; } protected void attemptPreview() { final DemoHandler selectedHandler = getSelectedHandler(); if (selectedHandler == null) { return; } final PreviewHandler previewHandler = selectedHandler.getPreviewHandler(); previewHandler.attemptPreview(); } }