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 - initial API and implementation * Lars Vogel <Lars.Vogel@vogella.com> - Bug 413427, 475361 * Jeanderson Candido (http://jeandersonbc.github.io) - Bug 414565 * Simon Scholz <simon.scholz@vogella.com> - Bug 448143 *******************************************************************************/ package org.eclipse.jface.snippets.viewers; import java.util.ArrayList; import java.util.List; import org.eclipse.jface.viewers.CellEditor; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ColumnViewerEditor; import org.eclipse.jface.viewers.ColumnViewerEditorActivationEvent; 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.TextCellEditor; import org.eclipse.jface.viewers.TreePath; 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.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; /** * Demonstrates how to use keyboard-editing support in a TreeViewer with no * column * * @author Tom Schindl <tom.schindl@bestsolution.at> * */ public class Snippet043TreeViewerKeyboardEditing { public Snippet043TreeViewerKeyboardEditing(final Shell shell) { Button b = new Button(shell, SWT.PUSH); b.setText("Press Tab, or click here to edit first child element"); final TreeViewer v = new TreeViewer(shell, SWT.BORDER | SWT.FULL_SELECTION); b.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { MyModel root = (MyModel) v.getInput(); TreePath path = new TreePath( new Object[] { root, root.child.get(1), root.child.get(1).child.get(0) }); v.editElement(path, 0); } }); TreeViewerColumn viewerColumn = new TreeViewerColumn(v, SWT.NONE); viewerColumn.getColumn().setWidth(300); viewerColumn.setLabelProvider(new ColumnLabelProvider()); viewerColumn.setEditingSupport(new EditingSupport(v) { @Override protected void setValue(Object element, Object value) { ((MyModel) element).counter = Integer.parseInt(value.toString()); getViewer().update(element, null); } @Override protected Object getValue(Object element) { return ((MyModel) element).counter + ""; } @Override protected CellEditor getCellEditor(Object element) { return new TextCellEditor((Composite) getViewer().getControl()); } @Override protected boolean canEdit(Object element) { return true; } }); TreeViewerFocusCellManager focusCellManager = new TreeViewerFocusCellManager(v, new FocusCellOwnerDrawHighlighter(v)); ColumnViewerEditorActivationStrategy actSupport = new ColumnViewerEditorActivationStrategy(v) { @Override protected boolean isEditorActivationEvent(ColumnViewerEditorActivationEvent event) { return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL || event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION || (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == SWT.CR) || event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC; } }; TreeViewerEditor.create(v, focusCellManager, actSupport, ColumnViewerEditor.TABBING_HORIZONTAL | ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR | ColumnViewerEditor.TABBING_VERTICAL | ColumnViewerEditor.KEYBOARD_ACTIVATION); v.setContentProvider(new MyContentProvider()); v.setInput(createModel()); } public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new Snippet043TreeViewerKeyboardEditing(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } private class MyContentProvider implements ITreeContentProvider { @Override public Object[] getElements(Object inputElement) { return ((MyModel) inputElement).child.toArray(); } @Override public Object[] getChildren(Object parentElement) { return getElements(parentElement); } @Override public Object getParent(Object element) { if (element == null) { return null; } return ((MyModel) element).parent; } @Override public boolean hasChildren(Object element) { return ((MyModel) element).child.size() > 0; } } private MyModel createModel() { MyModel root = new MyModel(0, null); root.counter = 0; MyModel tmp; MyModel subItem; for (int i = 1; i < 10; i++) { tmp = new MyModel(i, root); root.child.add(tmp); for (int j = 1; j < i; j++) { subItem = new MyModel(j, tmp); subItem.child.add(new MyModel(j * 100, subItem)); tmp.child.add(subItem); } } return root; } public class MyModel { public MyModel parent; public List<MyModel> child = new ArrayList<>(); public int counter; public MyModel(int counter, MyModel parent) { this.parent = parent; this.counter = counter; } @Override public String toString() { String rv = "Item "; if (parent != null) { rv = parent + "."; } rv += counter; return rv; } } }