Java tutorial
/******************************************************************************* * Copyright (c) 2015 IBM Corporation and others. * 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: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.e4.demo.cssbridge.ui.views; import static org.eclipse.e4.demo.cssbridge.util.ViewUtils.getDisplay; import java.util.Collections; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.eclipse.e4.demo.cssbridge.core.IMailService; import org.eclipse.e4.demo.cssbridge.model.FolderType; import org.eclipse.e4.demo.cssbridge.model.Importance; import org.eclipse.e4.demo.cssbridge.model.Mail; import org.eclipse.e4.demo.cssbridge.model.TreeItem; import org.eclipse.e4.demo.cssbridge.util.DateUtils; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TableViewerColumn; import org.eclipse.jface.viewers.TreeSelection; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.SashForm; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Link; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.ISelectionListener; import org.eclipse.ui.ISelectionService; import org.eclipse.ui.ISharedImages; import org.eclipse.ui.IViewSite; import org.eclipse.ui.IWorkbenchPart; import org.eclipse.ui.PartInitException; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.part.ViewPart; public class FolderPreviewView extends ViewPart { public static final String ID = "org.eclipse.e4.demo.cssbridge.ui.views.folderPreviewView"; private static final String[] VIEWER_COLUMN_NAMES = { "Importance", "Sender", "Subject", "Date" }; private Composite messageBodyComposite; private Text messageText; private Label subjectLabel; private Label dateLabel; private Link senderLink; private ISelectionService selectionService; private IMailService mailService; private TableViewer viewer; private ISelectionListener mailFolderChangedListener = new ISelectionListener() { @Override public void selectionChanged(IWorkbenchPart part, ISelection selection) { if (part instanceof FoldersView && selection instanceof StructuredSelection) { Object selected = ((TreeSelection) selection).getFirstElement(); if (selected instanceof TreeItem && ((TreeItem) selected).getValue() instanceof FolderType) { updateMailFolder((FolderType) ((TreeItem) selected).getValue()); } } } }; private Listener tableItemPaintListener = new ItemPaintListener<TableItem>() { @Override protected String getText(TableItem item, int index) { return item.getText(index); } @Override protected Rectangle getBounds(TableItem item, int index) { return item.getBounds(index); } @Override protected Rectangle getParentBounds(TableItem item) { return item.getParent().getBounds(); } @Override protected Font getFont(TableItem item) { return item.getFont(); } @Override protected Image getImage(TableItem item, int index) { if (index == 0 && item.getImage() != null) { return item.getImage(); } return null; } @Override protected int calculateTextLeftPadding(TableItem item, int index) { return 7; } }; private SelectionAdapter tableSelectionChangedListener = new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { Object data = e.item.getData(); updateMailBody(data instanceof Mail ? (Mail) data : null); } }; private Listener shellReskinListener = new Listener() { @Override public void handleEvent(Event event) { viewer.refresh(); refreshControl(messageBodyComposite); messageText.setBackground(viewer.getTable().getBackground()); } }; private SelectionAdapter senderLinkSelectionAdapter = new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { MessageDialog.openInformation(getSite().getShell(), "Not Implemented", "Imagine the address book or a new message being created now."); } }; private PaintListener senderLinkPaintListener = new PaintListener() { private Pattern HREF_TAG_PATTERN = Pattern.compile("<a>(.+)</a>"); @Override public void paintControl(PaintEvent e) { Link link = (Link) e.widget; e.gc.setForeground(Theme.getColor(Theme.Shell.LINK_FOREGROUND)); e.gc.setBackground(link.getBackground()); e.gc.fillRectangle(link.getBounds()); e.gc.drawText(trimTags(link.getText()), e.x, e.y, true); } private String trimTags(String linkText) { Matcher matcher = HREF_TAG_PATTERN.matcher(linkText); if (matcher.find() && matcher.groupCount() > 0) { return matcher.group(1); } return linkText; } }; @Override public void init(IViewSite site) throws PartInitException { super.init(site); selectionService = site.getService(ISelectionService.class); selectionService.addPostSelectionListener(mailFolderChangedListener); mailService = site.getService(IMailService.class); } @Override public void dispose() { selectionService.removePostSelectionListener(mailFolderChangedListener); getDisplay(getSite()).removeListener(SWT.Skin, shellReskinListener); if (!viewer.getTable().isDisposed()) { viewer.getTable().removeListener(SWT.PaintItem, tableItemPaintListener); viewer.getTable().removeSelectionListener(tableSelectionChangedListener); } if (!senderLink.isDisposed()) { senderLink.removeSelectionListener(senderLinkSelectionAdapter); senderLink.removePaintListener(senderLinkPaintListener); } super.dispose(); } @Override public void createPartControl(Composite parent) { SashForm form = new SashForm(parent, SWT.VERTICAL); form.setLayout(new FillLayout()); createMessageListComposite(form); createMessageBodyComposite(form); } private void createMessageListComposite(Composite parent) { viewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.BORDER); viewer.getTable().setHeaderVisible(true); viewer.setContentProvider(ArrayContentProvider.getInstance()); viewer.getTable().addSelectionListener(tableSelectionChangedListener); viewer.getTable().addListener(SWT.PaintItem, tableItemPaintListener); getDisplay(getSite()).addListener(SWT.Skin, shellReskinListener); for (int i = 0; i < VIEWER_COLUMN_NAMES.length; i++) { TableViewerColumn column = new TableViewerColumn(viewer, SWT.NONE); column.getColumn().setText(VIEWER_COLUMN_NAMES[i]); column.setLabelProvider(new ColumnLabelProviderExt(i)); } } private void updateMailFolder(FolderType folderType) { List<Mail> mails = mailService.getMails(folderType); viewer.setInput(mails != null ? mails : Collections.emptyList()); for (TableColumn column : viewer.getTable().getColumns()) { column.pack(); } if (!mails.isEmpty()) { viewer.setSelection(new StructuredSelection(mails.get(0))); updateMailBody(mails.get(0)); } else { updateMailBody(null); } } private void updateMailBody(Mail mail) { if (mail != null) { messageText.setText(mail.getBody()); subjectLabel.setText(mail.getSubject()); senderLink.setText(String.format("<a>%s</a>", mail.getSender())); dateLabel.setText(DateUtils.toString(mail.getDate())); } messageBodyComposite.setVisible(mail != null); messageBodyComposite.getParent().layout(); } private void refreshControl(org.eclipse.swt.widgets.Control control) { if (control instanceof Composite) { for (Control child : ((Composite) control).getChildren()) { refreshControl(child); } } else { control.setForeground(Theme.getColor(Theme.Shell.TEXT_AND_LABEL_FOREGROUND)); } } private void createMessageBodyComposite(Composite parent) { messageBodyComposite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.marginHeight = 0; layout.marginWidth = 0; messageBodyComposite.setLayout(layout); // top banner Composite banner = new Composite(messageBodyComposite, SWT.NONE); banner.setLayoutData( new GridData(GridData.HORIZONTAL_ALIGN_FILL, GridData.VERTICAL_ALIGN_BEGINNING, true, false)); layout = new GridLayout(); layout.marginHeight = 5; layout.marginWidth = 10; layout.numColumns = 2; banner.setLayout(layout); // setup bold font Font boldFont = JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT); Label l = new Label(banner, SWT.NONE); l.setText("Subject:"); l.setFont(boldFont); l.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false)); l.setForeground(Theme.getColor(Theme.Shell.TEXT_AND_LABEL_FOREGROUND)); GridData gridData = new GridData(SWT.BEGINNING, SWT.BEGINNING, true, false); gridData.minimumWidth = 100; subjectLabel = new Label(banner, SWT.WRAP); subjectLabel.setLayoutData(gridData); subjectLabel.setForeground(Theme.getColor(Theme.Shell.TEXT_AND_LABEL_FOREGROUND)); l = new Label(banner, SWT.NONE); l.setText("From:"); l.setFont(boldFont); l.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false)); l.setForeground(Theme.getColor(Theme.Shell.TEXT_AND_LABEL_FOREGROUND)); senderLink = new Link(banner, SWT.NONE); senderLink.addSelectionListener(senderLinkSelectionAdapter); senderLink.setLayoutData(gridData); senderLink.addPaintListener(senderLinkPaintListener); l = new Label(banner, SWT.NONE); l.setText("Date:"); l.setFont(boldFont); l.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false)); l.setForeground(Theme.getColor(Theme.Shell.TEXT_AND_LABEL_FOREGROUND)); dateLabel = new Label(banner, SWT.WRAP); dateLabel.setLayoutData(gridData); dateLabel.setForeground(Theme.getColor(Theme.Shell.TEXT_AND_LABEL_FOREGROUND)); // message contents messageText = new Text(messageBodyComposite, SWT.BORDER | SWT.MULTI | SWT.WRAP); messageText.setLayoutData(new GridData(GridData.FILL_BOTH)); messageText.setEditable(false); messageText.setBackground(messageText.getDisplay().getSystemColor(SWT.COLOR_WHITE)); messageText.setForeground(Theme.getColor(Theme.Shell.TEXT_AND_LABEL_FOREGROUND)); messageText.setBackground(viewer.getTable().getBackground()); } @Override public void setFocus() { } private static class ColumnLabelProviderExt extends ColumnLabelProvider { private int columnIndex; public ColumnLabelProviderExt(int columnIndex) { this.columnIndex = columnIndex; } @Override public Image getImage(Object element) { if (columnIndex == 0 && ((Mail) element).getImportance() == Importance.High) { return PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_DEC_FIELD_WARNING); } return null; } @Override public Font getFont(Object element) { Mail mail = (Mail) element; if (mail.getImportance() == Importance.High) { return Theme.getFont(Theme.FolderPreviewView.HIGH_IMP_MAIL_FONT); } if (mail.getImportance() == Importance.Normal) { return Theme.getFont(Theme.FolderPreviewView.NORMAL_IMP_MAIL_FONT); } return Theme.getFont(Theme.FolderPreviewView.LOW_IMP_MAIL_FONT); } @Override public Color getForeground(Object element) { Mail mail = (Mail) element; if (mail.getImportance() == Importance.High) { return Theme.getColor(Theme.FolderPreviewView.HIGH_IMP_MAIL_FOREGROUND); } if (mail.getImportance() == Importance.Normal) { return Theme.getColor(Theme.FolderPreviewView.NORMAL_IMP_MAIL_FOREGROUND); } return Theme.getColor(Theme.FolderPreviewView.LOW_IMP_MAIL_FOREGROUND); } @Override public String getText(Object element) { Mail mail = (Mail) element; switch (columnIndex) { case 1: return mail.getSender(); case 2: return mail.getSubject(); case 3: return DateUtils.toString(mail.getDate()); default: return ""; } } } }