Java tutorial
/******************************************************************************* * Copyright (c) 2013 GoPivotal, Inc. * 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: * GoPivotal, Inc. - initial API and implementation *******************************************************************************/ package org.springframework.ide.eclipse.boot.wizard.guides; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.internal.misc.StringMatcher; import org.eclipse.ui.internal.misc.StringMatcher.Position; import org.springframework.ide.eclipse.boot.wizard.content.Describable; import org.springsource.ide.eclipse.commons.livexp.core.LiveExpression; import org.springsource.ide.eclipse.commons.livexp.core.SelectionModel; import org.springsource.ide.eclipse.commons.livexp.core.ValidationResult; import org.springsource.ide.eclipse.commons.livexp.ui.ChooseOneSectionCombo; import org.springsource.ide.eclipse.commons.livexp.ui.IPageWithSections; /** * Wizard section to choose one element from list of elements. Uses a table viewer to allow selecting * an element. * <p> * This class is very similar in functionality (from client's point of view) to {@link ChooseOneSectionCombo}. * It should be possible to use either one of these classes as functional replacements for one another. */ @SuppressWarnings("restriction") public class ChooseOneSectionTable<T> extends ChooseOneSection { private class ChoicesFilter extends ViewerFilter { private StringMatcher matcher = null; public ChoicesFilter() { if (searchBox != null) { setSearchTerm(searchBox.getText()); } } public void setSearchTerm(String text) { matcher = new StringMatcher(text, true, false); } @Override public boolean select(Viewer viewer, Object parentElement, Object element) { if (matcher == null) { return true; } else { String label = labelProvider.getText(element); if (match(label)) { return true; } else if (element instanceof Describable) { String description = ((Describable) element).getDescription(); return match(description); } return false; } } private boolean match(String text) { if (matcher == null) { return true; // Search term not set... anything is acceptable. } else { Position x = matcher.find(text, 0, text.length()); return x != null; } } } private SelectionModel<T> selection; private String label; //Descriptive Label for this section private T[] options; //The elements to choose from private Text searchBox; private ChoicesFilter filter; public ChooseOneSectionTable(IPageWithSections owner, String label, SelectionModel<T> selection, T[] options) { super(owner); this.label = label; this.selection = selection; this.options = options; } @Override public LiveExpression<ValidationResult> getValidator() { return selection.validator; } @Override public void createContents(Composite page) { Composite field = new Composite(page, SWT.NONE); int cols = label == null ? 1 : 2; GridLayout layout = GridLayoutFactory.fillDefaults().numColumns(cols).create(); field.setLayout(layout); searchBox = new Text(field, SWT.SINGLE | SWT.BORDER | SWT.SEARCH | SWT.ICON_CANCEL); GridDataFactory.fillDefaults().grab(true, false).applyTo(searchBox); Label fieldNameLabel = null; if (label != null) { fieldNameLabel = new Label(field, SWT.NONE); fieldNameLabel.setText(label); } final TableViewer tv = new TableViewer(field, SWT.SINGLE | SWT.BORDER | SWT.V_SCROLL); tv.addFilter(filter = new ChoicesFilter()); tv.setLabelProvider(labelProvider); tv.setContentProvider(ArrayContentProvider.getInstance()); tv.setInput(options); if (fieldNameLabel != null) { GridDataFactory.fillDefaults().align(SWT.BEGINNING, SWT.BEGINNING).applyTo(fieldNameLabel); } GridDataFactory grab = GridDataFactory.fillDefaults().grab(true, true).hint(SWT.DEFAULT, 150); grab.applyTo(field); grab.applyTo(tv.getTable()); whenVisible(tv.getControl(), new Runnable() { public void run() { T preSelect = selection.selection.getValue(); if (preSelect != null) { tv.setSelection(new StructuredSelection(preSelect), true); } else { tv.setSelection(StructuredSelection.EMPTY, true); } } }); tv.addSelectionChangedListener(new ISelectionChangedListener() { @SuppressWarnings("unchecked") public void selectionChanged(SelectionChangedEvent event) { ISelection sel = tv.getSelection(); if (sel.isEmpty()) { selection.selection.setValue(null); } else if (sel instanceof IStructuredSelection) { IStructuredSelection ss = (IStructuredSelection) sel; selection.selection.setValue((T) ss.getFirstElement()); } } }); searchBox.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { filter.setSearchTerm(searchBox.getText()); tv.refresh(); } }); } private void whenVisible(final Control control, final Runnable runnable) { PaintListener l = new PaintListener() { public void paintControl(PaintEvent e) { runnable.run(); control.removePaintListener(this); } }; control.addPaintListener(l); } // private String[] getLabels() { // String[] labels = new String[options.length]; // for (int i = 0; i < labels.length; i++) { // labels[i] = labelProvider.getText(options[i]); // } // return labels; // } }