Java tutorial
/******************************************************************************* * Copyright (c) 2006, 2015 Tom Schindl 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: * Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation * Florian Potschka <signalrauschen@gmail.com> - Bug 260061 * Alexander Ljungberg <siker@norwinter.com> - Bug 260061 * Jeanderson Candido <http://jeandersonbc.github.io> - Bug 414565 * Lars Vogel <Lars.Vogel@vogella.com> - Bug 475361 *******************************************************************************/ package org.eclipse.jface.snippets.viewers; import java.util.ArrayList; import java.util.List; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.util.Util; import org.eclipse.jface.viewers.CellEditor; import org.eclipse.jface.viewers.ColumnViewer; import org.eclipse.jface.viewers.ColumnViewerEditor; import org.eclipse.jface.viewers.ColumnViewerEditorActivationStrategy; import org.eclipse.jface.viewers.EditingSupport; import org.eclipse.jface.viewers.FocusCellOwnerDrawHighlighter; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.OwnerDrawLabelProvider; import org.eclipse.jface.viewers.TextCellEditor; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.TreeViewerColumn; import org.eclipse.jface.viewers.TreeViewerEditor; import org.eclipse.jface.viewers.TreeViewerFocusCellManager; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerCell; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.TableItem; import org.eclipse.swt.widgets.TreeItem; /** * A simple TreeViewer to demonstrate usage * */ public class Snippet061FakedNativeCellEditor { private final class MyEditingSupport extends EditingSupport { private final TextCellEditor textCellEditor; private final TreeViewer viewer; private MyEditingSupport(ColumnViewer viewer, TextCellEditor textCellEditor, TreeViewer viewer2) { super(viewer); this.textCellEditor = textCellEditor; this.viewer = viewer2; } @Override protected boolean canEdit(Object element) { return true; } @Override protected CellEditor getCellEditor(Object element) { return textCellEditor; } @Override protected Object getValue(Object element) { return ((File) element).counter + ""; } @Override protected void setValue(Object element, Object value) { ((File) element).counter = Integer.parseInt(value.toString()); viewer.update(element, null); } } private class MyContentProvider implements ITreeContentProvider { @Override public Object[] getElements(Object inputElement) { return ((File) inputElement).child.toArray(); } @Override public void dispose() { } @Override public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } @Override public Object[] getChildren(Object parentElement) { return getElements(parentElement); } @Override public Object getParent(Object element) { if (element == null) { return null; } return ((File) element).parent; } @Override public boolean hasChildren(Object element) { return ((File) element).child.size() > 0; } } public abstract class EmulatedNativeCheckBoxLabelProvider extends OwnerDrawLabelProvider { private static final String CHECKED_KEY = "CHECKED"; private static final String UNCHECK_KEY = "UNCHECKED"; public EmulatedNativeCheckBoxLabelProvider(ColumnViewer viewer) { if (JFaceResources.getImageRegistry().getDescriptor(CHECKED_KEY) == null) { JFaceResources.getImageRegistry().put(UNCHECK_KEY, makeShot(viewer.getControl(), false)); JFaceResources.getImageRegistry().put(CHECKED_KEY, makeShot(viewer.getControl(), true)); } } private Image makeShot(Control control, boolean type) { // Hopefully no platform uses exactly this color because we'll make // it transparent in the image. Color greenScreen = new Color(control.getDisplay(), 222, 223, 224); Shell shell = new Shell(control.getShell(), SWT.NO_TRIM); // otherwise we have a default gray color shell.setBackground(greenScreen); if (Util.isMac()) { Button button2 = new Button(shell, SWT.CHECK); Point bsize = button2.computeSize(SWT.DEFAULT, SWT.DEFAULT); // otherwise an image is stretched by width bsize.x = Math.max(bsize.x - 1, bsize.y - 1); bsize.y = Math.max(bsize.x - 1, bsize.y - 1); button2.setSize(bsize); button2.setLocation(100, 100); } Button button = new Button(shell, SWT.CHECK); button.setBackground(greenScreen); button.setSelection(type); // otherwise an image is located in a corner button.setLocation(1, 1); Point bsize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT); // otherwise an image is stretched by width bsize.x = Math.max(bsize.x - 1, bsize.y - 1); bsize.y = Math.max(bsize.x - 1, bsize.y - 1); button.setSize(bsize); shell.setSize(bsize); shell.open(); GC gc = new GC(shell); Image image = new Image(control.getDisplay(), bsize.x, bsize.y); gc.copyArea(image, 0, 0); gc.dispose(); shell.close(); ImageData imageData = image.getImageData(); imageData.transparentPixel = imageData.palette.getPixel(greenScreen.getRGB()); Image img = new Image(control.getDisplay(), imageData); image.dispose(); return img; } public Image getImage(Object element) { if (isChecked(element)) { return JFaceResources.getImageRegistry().get(CHECKED_KEY); } else { return JFaceResources.getImageRegistry().get(UNCHECK_KEY); } } @Override protected void measure(Event event, Object element) { event.height = getImage(element).getBounds().height; } @Override protected void paint(Event event, Object element) { Image img = getImage(element); if (img != null) { Rectangle bounds; if (event.item instanceof TableItem) { bounds = ((TableItem) event.item).getBounds(event.index); } else { bounds = ((TreeItem) event.item).getBounds(event.index); } Rectangle imgBounds = img.getBounds(); bounds.width /= 2; bounds.width -= imgBounds.width / 2; bounds.height /= 2; bounds.height -= imgBounds.height / 2; int x = bounds.width > 0 ? bounds.x + bounds.width : bounds.x; int y = bounds.height > 0 ? bounds.y + bounds.height : bounds.y; if (SWT.getPlatform().equals("carbon")) { event.gc.drawImage(img, x + 2, y - 1); } else { event.gc.drawImage(img, x, y - 1); } } } protected abstract boolean isChecked(Object element); } public Snippet061FakedNativeCellEditor(final Shell shell) { final TreeViewer viewer = new TreeViewer(shell, SWT.BORDER | SWT.FULL_SELECTION); viewer.getTree().setLinesVisible(true); viewer.getTree().setBackgroundMode(SWT.INHERIT_DEFAULT); viewer.getTree().setHeaderVisible(true); FocusCellOwnerDrawHighlighter h = new FocusCellOwnerDrawHighlighter(viewer) { @Override protected Color getSelectedCellBackgroundColorNoFocus(ViewerCell cell) { return shell.getDisplay().getSystemColor(SWT.COLOR_LIST_SELECTION); } @Override protected Color getSelectedCellForegroundColorNoFocus(ViewerCell cell) { return shell.getDisplay().getSystemColor(SWT.COLOR_WIDGET_FOREGROUND); } }; TreeViewerFocusCellManager focusCellManager = new TreeViewerFocusCellManager(viewer, h); ColumnViewerEditorActivationStrategy actSupport = new ColumnViewerEditorActivationStrategy(viewer); int features = ColumnViewerEditor.TABBING_HORIZONTAL | ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR | ColumnViewerEditor.TABBING_VERTICAL | ColumnViewerEditor.KEYBOARD_ACTIVATION; TreeViewerEditor.create(viewer, focusCellManager, actSupport, features); final TextCellEditor textCellEditor = new TextCellEditor(viewer.getTree()); final BooleanCellEditor booleanCellEditor = new BooleanCellEditor(viewer.getTree()); booleanCellEditor.setChangeOnActivation(true); TreeViewerColumn column = null; column = createColumnFor(viewer, SWT.NONE, "File"); column.setLabelProvider(new OwnerDrawLabelProvider() { @Override protected void measure(Event event, Object element) { } @Override protected void paint(Event event, Object element) { ((TreeItem) event.item).setText(element.toString()); } }); column.setEditingSupport(new MyEditingSupport(viewer, textCellEditor, viewer)); column = createColumnFor(viewer, SWT.CENTER, "Read"); column.setLabelProvider(new EmulatedNativeCheckBoxLabelProvider(viewer) { @Override protected boolean isChecked(Object element) { return ((File) element).read; } }); column.setEditingSupport(new MyEditingSupport(viewer, textCellEditor, viewer)); column = createColumnFor(viewer, SWT.CENTER, "Write"); column.setLabelProvider(new EmulatedNativeCheckBoxLabelProvider(viewer) { @Override protected boolean isChecked(Object element) { return ((File) element).write; } }); column.setEditingSupport(new MyEditingSupport(viewer, textCellEditor, viewer)); column = createColumnFor(viewer, SWT.CENTER, "Execute"); column.setLabelProvider(new EmulatedNativeCheckBoxLabelProvider(viewer) { @Override protected boolean isChecked(Object element) { return ((File) element).execute; } }); column.setEditingSupport(new MyEditingSupport(viewer, textCellEditor, viewer)); viewer.setContentProvider(new MyContentProvider()); viewer.setInput(createModel()); } private TreeViewerColumn createColumnFor(TreeViewer viewer, int style, String label) { TreeViewerColumn column = new TreeViewerColumn(viewer, style); column.getColumn().setWidth(200); column.getColumn().setMoveable(true); column.getColumn().setText(label); return column; } private File createModel() { File root = new File(0, null); root.counter = 0; File tmp; File subItem; for (int i = 1; i < 10; i++) { tmp = new File(i, root); root.child.add(tmp); for (int j = 1; j < i; j++) { subItem = new File(j, tmp); subItem.child.add(new File(j * 100, subItem)); tmp.child.add(subItem); } } return root; } public static void main(String[] args) { try { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new Snippet061FakedNativeCellEditor(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } catch (Exception e) { e.printStackTrace(); } } public class File { public File parent; public List<File> child = new ArrayList<>(); public int counter; public boolean read; public boolean write; public boolean execute; public File(int counter, File parent) { this.parent = parent; this.counter = counter; this.read = counter % 2 == 0; this.write = counter % 3 == 0; this.execute = counter % 4 == 0; } @Override public String toString() { String rv = "Item "; if (parent != null) { rv = parent + "."; } rv += counter; return rv; } } }