Java tutorial
/////////////////////////////////////////////////////////////////////////////// // // PACKAGE : com.astra.ses.spell.gui.dialogs // // FILE : PromptDialog.java // // DATE : 2008-11-21 08:55 // // Copyright (C) 2008, 2010 SES ENGINEERING, Luxembourg S.A.R.L. // // By using this software in any way, you are agreeing to be bound by // the terms of this license. // // 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 // // NO WARRANTY // EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS PROVIDED // ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER // EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR // CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A // PARTICULAR PURPOSE. Each Recipient is solely responsible for determining // the appropriateness of using and distributing the Program and assumes all // risks associated with its exercise of rights under this Agreement , // including but not limited to the risks and costs of program errors, // compliance with applicable laws, damage to or loss of data, programs or // equipment, and unavailability or interruption of operations. // // DISCLAIMER OF LIABILITY // EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT NOR ANY // CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION // LOST PROFITS), HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) // ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE PROGRAM OR THE // EXERCISE OF ANY RIGHTS GRANTED HEREUNDER, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGES. // // Contributors: // SES ENGINEERING - initial API and implementation and/or initial documentation // // PROJECT : SPELL // // SUBPROJECT: SPELL GUI Client // /////////////////////////////////////////////////////////////////////////////// package com.astra.ses.spell.gui.dialogs; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.dialogs.TitleAreaDialog; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import com.astra.ses.spell.gui.Activator; /******************************************************************************* * @brief Dialog for goto on gui * @date 18/09/07 * @author Rafael Chinchilla (GMV) ******************************************************************************/ public class GotoDialog extends TitleAreaDialog { // ========================================================================= // # STATIC DATA MEMBERS // ========================================================================= // PRIVATE ----------------------------------------------------------------- // PROTECTED --------------------------------------------------------------- // PUBLIC ------------------------------------------------------------------ // ========================================================================= // # INSTANCE DATA MEMBERS // ========================================================================= // PRIVATE ----------------------------------------------------------------- /** Holds the dialog image icon */ private Image m_image; /** Holds the target */ private String m_target; /** True if the target is a label */ private boolean m_isLabel; /** Holds the text input */ private Text m_input; /** Holds the line type radio button */ private Button m_typeLine; /** Holds the label type radio button */ private Button m_typeLabel; // PROTECTED --------------------------------------------------------------- // PUBLIC ------------------------------------------------------------------ // ========================================================================= // # ACCESSIBLE METHODS // ========================================================================= /*************************************************************************** * Constructor * * @param shell * The parent shell **************************************************************************/ public GotoDialog(Shell shell) { super(shell); // Obtain the image for the dialog icon ImageDescriptor descr = Activator.getImageDescriptor("icons/dlg_question.png"); m_image = descr.createImage(); m_target = null; m_isLabel = false; } /*************************************************************************** * Called when the dialog is about to close. * * @return The superclass return value. **************************************************************************/ public boolean close() { m_image.dispose(); m_typeLabel.dispose(); m_typeLine.dispose(); m_input.dispose(); return super.close(); } // ========================================================================= // # NON-ACCESSIBLE METHODS // ========================================================================= /*************************************************************************** * Creates the dialog contents. * * @param parent * The base composite of the dialog * @return The resulting contents **************************************************************************/ protected Control createContents(Composite parent) { Control contents = super.createContents(parent); setMessage("Please enter the target of the go-to, either a label or a line number"); setTitle("Goto target"); setTitleImage(m_image); return contents; } /*************************************************************************** * Create the dialog area contents. * * @param parent * The base composite of the dialog * @return The resulting contents **************************************************************************/ protected Control createDialogArea(Composite parent) { // Main composite of the dialog area ----------------------------------- Composite top = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); top.setLayoutData(new GridData(GridData.FILL_BOTH)); layout.marginHeight = 2; layout.marginWidth = 2; layout.marginTop = 2; layout.marginBottom = 2; layout.marginLeft = 2; layout.marginRight = 2; layout.numColumns = 1; top.setLayout(layout); Label label = new Label(top, SWT.NONE); label.setText("Target type"); label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Composite ctype = new Composite(top, SWT.NONE); GridLayout clayout = new GridLayout(); clayout.numColumns = 2; ctype.setLayout(clayout); ctype.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); m_typeLabel = new Button(ctype, SWT.RADIO); m_typeLabel.setText("Go to label"); m_typeLabel.setSelection(true); m_typeLine = new Button(ctype, SWT.RADIO); m_typeLine.setSelection(false); m_typeLine.setText("Go to line number"); m_input = new Text(top, SWT.BORDER); m_input.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); m_input.setFocus(); return parent; } /*************************************************************************** * Create the button bar buttons. * * @param parent * The Button Bar. **************************************************************************/ protected void createButtonsForButtonBar(Composite parent) { createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); } /*************************************************************************** * Called when one of the buttons of the button bar is pressed. * * @param buttonId * The button identifier. **************************************************************************/ protected void buttonPressed(int buttonId) { switch (buttonId) { case IDialogConstants.OK_ID: m_target = m_input.getText(); if (m_typeLine.getSelection()) { try { Integer.parseInt(m_target); } catch (NumberFormatException ex) { MessageDialog.openError(getShell(), "Input error", "Shall provide a valid line number"); } } else { if (m_target.trim().isEmpty()) { MessageDialog.openError(getShell(), "Input error", "Shall provide a valid step label"); return; } } m_isLabel = m_typeLabel.getSelection(); close(); break; case IDialogConstants.CANCEL_ID: m_target = null; m_isLabel = false; close(); break; } } public String getTarget() { return m_target; } public boolean isLabel() { return m_isLabel; } }