Java tutorial
/******************************************************************************* * Copyright (c) 2010 Weltevree Beheer BV, Remain Software & Industrial-TSI * * 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: * Wim Jongman - initial API and implementation *******************************************************************************/ package org.eclipse.ecf.salvo.ui.internal.editor; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.ecf.protocol.nntp.model.IArticle; import org.eclipse.ecf.protocol.nntp.model.INewsgroup; import org.eclipse.ecf.salvo.ui.internal.Activator; import org.eclipse.ecf.salvo.ui.internal.resources.ISalvoResource; import org.eclipse.jface.action.IMenuListener; import org.eclipse.jface.action.IMenuManager; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.action.Separator; import org.eclipse.jface.layout.TreeColumnLayout; import org.eclipse.jface.viewers.ColumnPixelData; import org.eclipse.jface.viewers.ColumnWeightData; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.ToolBar; import org.eclipse.swt.widgets.ToolItem; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeColumn; import org.eclipse.swt.widgets.TreeItem; import org.eclipse.ui.IEditorInput; import org.eclipse.ui.IEditorSite; import org.eclipse.ui.ISelectionListener; import org.eclipse.ui.IWorkbenchActionConstants; import org.eclipse.ui.IWorkbenchPart; import org.eclipse.ui.PartInitException; import org.eclipse.ui.part.EditorPart; /** * This editor fills a lazy table tree with the article information and to the * left of this table a static table is attached that contains information icons * like follow and attachments indicators. * * @author wim.jongman@gmail.com * */ public class ArticlePanel extends EditorPart implements ISelectionListener { public class ArticlePanelSideTableMeasureListener implements Listener { public void handleEvent(Event event) { event.height = tree.getItemHeight(); } } /** * Calculate the index match between the static side table and the dynamic * main table and then annotate the article in the side table. * * @author wim.jongman@gmail.com * */ private final class ArticlePanelTreePaintListener implements PaintListener { public void paintControl(PaintEvent e) { if (tree.getTopItem() == null) return; try { // Stop & start drawing of the main tree seems to trigger // flooding of paint events. // tree.setRedraw(false); // Stop the sidetable from flickering sideTable.setVisible(false); // Calculate the current visible top and bottom indices in the // main tree. int itemHeight = tree.getItemHeight(); Rectangle clientArea = tree.getClientArea(); int offset = tree.getTopItem().getBounds().y; // Walk over the current visible articles and set/remove the // icons in the side tree int counter = 0; while (true) { // Get the item at the next visible location Point point = new Point(0, counter++ * itemHeight); TreeItem itemd = null; if (clientArea.height > point.y) itemd = tree.getItem(new Point(0, point.y + offset)); if (itemd == null || itemd.getData() == null) return; IArticle article = (IArticle) ((ISalvoResource) itemd.getData()).getObject(); // Make the side tree just as long as the (resized) main // tree sideTable.setItemCount(counter); // Set some icons if required sideTable.getItem(counter - 1).setImage(1, getImage(article, 1)); sideTable.getItem(counter - 1).setImage(2, getImage(article, 2)); } } finally { // int s = (tree.getVerticalBar().getSelection() / 2) * 2; // if (s == tree.getVerticalBar().getSelection()) { // sideTable.setItemCount(sideTable.getItemCount() + 1); // sideTable.getItem(sideTable.getItemCount() - 1).setText(1, // (sideTable.getItemCount() - 1) + ""); // sideTable.showItem(sideTable.getItem(sideTable // .getItemCount() - 1)); // } sideTable.pack(); sideTable.setVisible(true); // tree.setVisible(true); } } /** * Decorate this row. * * @param article * @param row * @return */ private Image getImage(IArticle article, int row) { if (row == 1) if (!article.isReply() && article.isCommenting() || article.isMine()) return Activator.getDefault().getImageRegistry().get("messages.gif"); if (row == 2) if (article.isMarked()) return Activator.getDefault().getImageRegistry().get("follow.gif"); return null; } } public ArticlePanel() { } private Tree sideTable; private TreeViewer treeViewer; public static final String ID = "org.eclipse.ecf.salvo.ui.articlepanel"; private Tree tree; private INewsgroup savedNewsgroup; @Override public void doSave(IProgressMonitor monitor) { } @Override public void doSaveAs() { } @Override public void init(IEditorSite site, IEditorInput input) throws PartInitException { setSite(site); setInput(input); } @Override public boolean isDirty() { return false; } @Override public boolean isSaveAsAllowed() { return false; } @Override public void createPartControl(Composite parent) { final GridLayout gridLayout = new GridLayout(); gridLayout.horizontalSpacing = 0; gridLayout.verticalSpacing = 0; gridLayout.marginWidth = 0; gridLayout.marginHeight = 0; parent.setLayout(gridLayout); final ToolBar toolBar = new ToolBar(parent, SWT.NONE); final ToolItem newItemToolItem = new ToolItem(toolBar, SWT.PUSH); newItemToolItem.setText("New item"); final ToolItem newItemToolItem_1 = new ToolItem(toolBar, SWT.PUSH); newItemToolItem_1.setText("New item"); // composite_1.setSize(494, 174); TreeColumnLayout layout1 = new TreeColumnLayout(); TreeColumnLayout layout2 = new TreeColumnLayout(); final Composite tableComposite = new Composite(parent, SWT.NONE); tableComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); final GridLayout gridLayout_1 = new GridLayout(); gridLayout_1.numColumns = 2; gridLayout_1.verticalSpacing = 0; gridLayout_1.marginWidth = 0; gridLayout_1.marginHeight = 0; gridLayout_1.horizontalSpacing = 0; tableComposite.setLayout(gridLayout_1); // do something with the result final Composite tree1Composite = new Composite(tableComposite, SWT.NONE); tree1Composite.setLayoutData(new GridData(SWT.LEFT, SWT.FILL, false, true)); sideTable = new Tree(tree1Composite, SWT.NONE); sideTable.setLinesVisible(true); sideTable.setHeaderVisible(true); sideTable.addListener(SWT.MeasureItem, new ArticlePanelSideTableMeasureListener()); final TreeColumn column1 = new TreeColumn(sideTable, SWT.NONE); layout1.setColumnData(column1, new ColumnWeightData(00)); final TreeColumn column2 = new TreeColumn(sideTable, SWT.NONE); column2.setResizable(false); column2.setWidth(18); layout1.setColumnData(column2, new ColumnWeightData(50)); final TreeColumn column3 = new TreeColumn(sideTable, SWT.NONE); column3.setResizable(false); column3.setWidth(18); layout1.setColumnData(column3, new ColumnWeightData(50)); tree1Composite.setLayout(layout1); column1.setWidth(0); final Composite tree2Composite = new Composite(tableComposite, SWT.NONE); tree2Composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); final GridLayout gridLayout_3 = new GridLayout(); gridLayout_3.marginWidth = 0; treeViewer = new TreeViewer(tree2Composite, SWT.VIRTUAL | SWT.FULL_SELECTION); tree = treeViewer.getTree(); tree.setLinesVisible(true); treeViewer.setUseHashlookup(true); treeViewer.setLabelProvider(new ArticlePaneLabelProvider()); treeViewer.setContentProvider(new ArticlePanelContentProvider()); tree.setHeaderVisible(true); tree.addPaintListener(new ArticlePanelTreePaintListener()); final TreeColumn newColumnTreeColumn_2 = new TreeColumn(tree, SWT.NONE); newColumnTreeColumn_2.setText("subject"); layout2.setColumnData(newColumnTreeColumn_2, new ColumnWeightData(50)); final TreeColumn newColumnTreeColumn_3 = new TreeColumn(tree, SWT.NONE); newColumnTreeColumn_3.setText("from"); layout2.setColumnData(newColumnTreeColumn_3, new ColumnWeightData(25)); newColumnTreeColumn_3.setMoveable(true); final TreeColumn newColumnTreeColumn_4 = new TreeColumn(tree, SWT.NONE); newColumnTreeColumn_4.setText("sent"); layout2.setColumnData(newColumnTreeColumn_4, new ColumnPixelData(100)); newColumnTreeColumn_4.setMoveable(true); final TreeColumn newColumnTreeColumn_5 = new TreeColumn(tree, SWT.NONE); newColumnTreeColumn_5.setText("size"); layout2.setColumnData(newColumnTreeColumn_5, new ColumnPixelData(40)); newColumnTreeColumn_5.setMoveable(true); tree2Composite.setLayout(layout2); getSite().setSelectionProvider(treeViewer); addContextMenu(treeViewer); getSite().getWorkbenchWindow().getSelectionService().addPostSelectionListener(this); setInput(((ArticlePanelInput) getEditorInput()).getNewsgroup()); } private void addContextMenu(TreeViewer viewer) { MenuManager menuMgr = new MenuManager(); menuMgr.setRemoveAllWhenShown(true); menuMgr.addMenuListener(new IMenuListener() { public void menuAboutToShow(IMenuManager mgr) { fillContextMenu(mgr); } }); // Create menu. Menu menu = menuMgr.createContextMenu(viewer.getControl()); viewer.getControl().setMenu(menu); // Register menu for extension. getSite().registerContextMenu(menuMgr, viewer); } protected void fillContextMenu(IMenuManager mgr) { mgr.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS)); } @Override public void dispose() { getSite().getWorkbenchWindow().getSelectionService().removePostSelectionListener(this); super.dispose(); } @Override public void setFocus() { tree.setFocus(); } private void setInput(INewsgroup group) { // TODO Spin of a Job that loads the articles in the newsgroup // new NewsgroupArticleLoaderJob(group).schedule(); if (group != savedNewsgroup) { savedNewsgroup = group; ((ArticlePanelInput) getEditorInput()).setNewsGroup(group); setPartName(group.getNewsgroupName()); treeViewer.getTree().clearAll(true); treeViewer.setInput(group); } } public void selectionChanged(IWorkbenchPart part, ISelection selection) { if (part == this) { return; } if (selection instanceof IStructuredSelection) { if (((IStructuredSelection) selection).getFirstElement() instanceof ISalvoResource) { if (((ISalvoResource) ((IStructuredSelection) selection).getFirstElement()) .getObject() instanceof INewsgroup) { setInput((INewsgroup) ((ISalvoResource) ((IStructuredSelection) selection).getFirstElement()) .getObject()); } } } } public void updateArticle(ISalvoResource resource) { treeViewer.update(resource, null); } }