Java tutorial
/* * ------------------------------------------------------------------ * This source code, its documentation and all appendant files * are protected by copyright law. All rights reserved. * * Copyright (C) 2016 * Novartis Institutes for BioMedical Research * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, Version 3, as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses>. * * Additional permission under GNU GPL version 3 section 7: * * KNIME interoperates with ECLIPSE solely via ECLIPSE's plug-in APIs. * Hence, KNIME and ECLIPSE are both independent programs and are not * derived from each other. Should, however, the interpretation of the * GNU GPL Version 3 ("License") under any applicable laws result in * KNIME and ECLIPSE being a combined program, KNIME GMBH herewith grants * you the additional permission to use and propagate KNIME together with * ECLIPSE with only the license terms in place for ECLIPSE applying to * ECLIPSE and the GNU GPL Version 3 applying for KNIME, provided the * license terms of ECLIPSE themselves allow for the respective use and * propagation of ECLIPSE together with KNIME. * * Additional permission relating to nodes for KNIME that extend the Node * Extension (and in particular that are based on subclasses of NodeModel, * NodeDialog, and NodeView) and that only interoperate with KNIME through * standard APIs ("Nodes"): * Nodes are deemed to be separate and independent programs and to not be * covered works. Notwithstanding anything to the contrary in the * License, the License does not apply to Nodes, you are not required to * license Nodes under the License, and you are granted a license to * prepare and propagate Nodes, in each case even if such Nodes are * propagated with or for interoperation with KNIME. The owner of a Node * may freely choose the license terms applicable to such Node, including * when such Node is propagated with or for interoperation with KNIME. * --------------------------------------------------------------------- */ package org.rdkit.knime.util; import org.eclipse.core.runtime.Assert; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.preference.FieldEditor; import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Shell; /** * An abstract field editor for a string type preference that presents a string * input field with a change button to its right to edit the input field's * content. When the user presses the change button, the abstract framework * method <code>changePressed()</code> gets called to compute a new string. * * @author Manuel Schwarze */ public abstract class PreferenceButton extends FieldEditor { /** * The change button, or <code>null</code> if none (before creation and * after disposal). */ private Button m_button; /** * The text for the change button, or <code>null</code> if missing. */ private String m_strLabel; /** * Creates a new string button field editor */ protected PreferenceButton() { m_strLabel = null; } /** * Creates a string button field editor. * * @param labelText * the label text of the button * @param parent * the parent of the field editor's control */ protected PreferenceButton(String labelText, Composite parent) { m_strLabel = labelText; init(labelText, labelText); createControl(parent); } protected void adjustForNumColumns(int numColumns) { GridData gd = (GridData) m_button.getLayoutData(); gd.horizontalSpan = numColumns; } @Override protected void doLoad() { // Ignored as this button does not store any } @Override protected void doLoadDefault() { // Ignored as this button does not store any } @Override protected void doStore() { // Ignored as this button does not store any } /** * Notifies that the button has been pressed. * <p> * Subclasses must implement this method to provide an action. * </p> * * @return the new string to display, or <code>null</code> to leave the old * string showing */ protected abstract void onButtonClicked(); protected void doFillIntoGrid(Composite parent, int numColumns) { m_button = getButtonControl(parent); GridData gd = new GridData(); gd.horizontalAlignment = GridData.FILL; int widthHint = convertHorizontalDLUsToPixels(m_button, IDialogConstants.BUTTON_WIDTH); gd.widthHint = Math.max(widthHint, m_button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); m_button.setLayoutData(gd); } /** * Get the button control. Create it in parent if required. * * @param parent * @return Button */ protected Button getButtonControl(Composite parent) { if (m_button == null) { m_button = new Button(parent, SWT.PUSH); if (m_strLabel == null) { m_strLabel = "Perform Action"; } m_button.setText(m_strLabel); m_button.setFont(parent.getFont()); m_button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent evt) { onButtonClicked(); } }); m_button.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent event) { m_button = null; } }); } else { checkParent(m_button, parent); } return m_button; } /* * (non-Javadoc) Method declared on FieldEditor. */ public int getNumberOfControls() { return 1; } /** * Returns this field editor's shell. * * @return the shell */ protected Shell getShell() { if (m_button == null) { return null; } return m_button.getShell(); } /** * Sets the text of the change button. * * @param text * the new text */ public void setButtonLabel(String text) { Assert.isNotNull(text); m_strLabel = text; if (m_button != null) { m_button.setText(text); Point prefSize = m_button.computeSize(SWT.DEFAULT, SWT.DEFAULT); GridData data = (GridData) m_button.getLayoutData(); data.widthHint = Math.max(SWT.DEFAULT, prefSize.x); } } public void setEnabled(boolean enabled, Composite parent) { if (m_button != null) { m_button.setEnabled(enabled); } } }