Java tutorial
/******************************************************************************* * Copyright (c) 2007, 2016 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * IBM Corporation - initial API and implementation * Michael Krkoska - initial API and implementation (bug 188333) * Lars Vogel (lars.vogel@gmail.com) - Bug 413427, 487940, 510301 *******************************************************************************/ package org.eclipse.jface.snippets.viewers; import java.io.File; import java.text.MessageFormat; import org.eclipse.jface.preference.JFacePreferences; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.StyledCellLabelProvider; import org.eclipse.jface.viewers.StyledString; import org.eclipse.jface.viewers.StyledString.Styler; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.ViewerCell; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.FontData; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.graphics.TextStyle; 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.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; /** * Using a {@link StyledCellLabelProvider} on table viewer. */ public class Snippet049StyledCellLabelProvider { private static final int SHELL_WIDTH = 400; private static final Display DISPLAY = Display.getDefault(); public static void main(String[] args) { JFaceResources.getColorRegistry().put(JFacePreferences.COUNTER_COLOR, new RGB(0, 127, 174)); Shell shell = new Shell(DISPLAY, SWT.CLOSE | SWT.RESIZE); shell.setSize(SHELL_WIDTH, 400); shell.setLayout(new GridLayout(1, false)); Snippet049StyledCellLabelProvider example = new Snippet049StyledCellLabelProvider(); Control composite = example.createPartControl(shell); composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1)); shell.open(); while (!shell.isDisposed()) { if (!DISPLAY.readAndDispatch()) { DISPLAY.sleep(); } } DISPLAY.dispose(); } public Snippet049StyledCellLabelProvider() { } public Composite createPartControl(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); composite.setLayout(new GridLayout(1, true)); Label label = new Label(composite, SWT.NONE); label.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false)); label.setText("Viewer with a StyledCellLabelProvider:"); //$NON-NLS-1$ final TableViewer tableViewer = new TableViewer(composite, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL); // Multi-font support only works in JFace 3.5 and above (specifically, 3.5 M4 and above). // With JFace 3.4, the font information (bold in this example) will be ignored. FontData[] boldFontData = getModifiedFontData(tableViewer.getTable().getFont().getFontData(), SWT.BOLD); Font boldFont = new Font(Display.getCurrent(), boldFontData); ExampleLabelProvider labelProvider = new ExampleLabelProvider(boldFont); FileSystemContentProvider contentProvider = new FileSystemContentProvider(); tableViewer.setContentProvider(contentProvider); tableViewer.setLabelProvider(labelProvider); GridData data = new GridData(GridData.FILL, GridData.FILL, true, true); tableViewer.getControl().setLayoutData(data); tableViewer.setInput(new Object()); return composite; } private static FontData[] getModifiedFontData(FontData[] originalData, int additionalStyle) { FontData[] styleData = new FontData[originalData.length]; for (int i = 0; i < styleData.length; i++) { FontData base = originalData[i]; styleData[i] = new FontData(base.getName(), base.getHeight(), base.getStyle() | additionalStyle); } return styleData; } private static class ExampleLabelProvider extends StyledCellLabelProvider { private static int IMAGE_SIZE = 16; private static final Image IMAGE1 = new Image(DISPLAY, DISPLAY.getSystemImage(SWT.ICON_WARNING).getImageData().scaledTo(IMAGE_SIZE, IMAGE_SIZE)); private static final Image IMAGE2 = new Image(DISPLAY, DISPLAY.getSystemImage(SWT.ICON_ERROR).getImageData().scaledTo(IMAGE_SIZE, IMAGE_SIZE)); private final Styler fBoldStyler; public ExampleLabelProvider(final Font boldFont) { fBoldStyler = new Styler() { @Override public void applyStyles(TextStyle textStyle) { textStyle.font = boldFont; } }; } @Override public void update(ViewerCell cell) { Object element = cell.getElement(); if (element instanceof File) { File file = (File) element; // Multi-font support only works in JFace 3.5 and above (specifically, 3.5 M4 and above). // With JFace 3.4, the font information (bold in this example) will be ignored. Styler style = file.isDirectory() ? fBoldStyler : null; StyledString styledString = new StyledString(file.getName(), style); String decoration = MessageFormat.format(" ({0} bytes)", Long.valueOf(file.length())); //$NON-NLS-1$ styledString.append(decoration, StyledString.COUNTER_STYLER); cell.setText(styledString.toString()); cell.setStyleRanges(styledString.getStyleRanges()); if (file.isDirectory()) { cell.setImage(IMAGE1); } else { cell.setImage(IMAGE2); } } else { cell.setText("Unknown element"); //$NON-NLS-1$ } super.update(cell); } @Override protected void measure(Event event, Object element) { super.measure(event, element); } } private static class FileSystemContentProvider implements IStructuredContentProvider { @Override public Object[] getElements(Object element) { File[] roots = File.listRoots(); for (File root : roots) { File[] list = root.listFiles(); if (list != null && list.length > 0) { return list; } } return roots; } } }