| /******************************************************************************* |
| * Copyright (c) 2012 Laurent CARON |
| * 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: |
| * Laurent CARON (laurent.caron at gmail dot com) - Initial API and implementation |
| *******************************************************************************/ |
| package org.mihalis.opal.calculator; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.SWTException; |
| import org.eclipse.swt.events.ModifyListener; |
| import org.eclipse.swt.layout.GridData; |
| import org.eclipse.swt.layout.GridLayout; |
| import org.eclipse.swt.widgets.Composite; |
| import org.eclipse.swt.widgets.Label; |
| |
| /** |
| * Instances of this class are calculator. |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>(none)</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>(none)</dd> |
| * </dl> |
| * This component is inspired by Hermant (http://www.javabeginner.com/java-swing/java-swing-calculator) |
| */ |
| public class Calculator extends Composite { |
| |
| /** The display area. */ |
| private final Label displayArea; |
| |
| /** The panel. */ |
| private final CalculatorButtonsComposite panel; |
| |
| /** |
| * Constructs a new instance of this class given its parent and a style |
| * value describing its behavior and appearance. |
| * <p> |
| * The style value is either one of the style constants defined in class |
| * <code>SWT</code> which is applicable to instances of this class, or must |
| * be built by <em>bitwise OR</em>'ing together (that is, using the |
| * <code>int</code> "|" operator) two or more of those <code>SWT</code> |
| * style constants. The class description lists the style constants that are |
| * applicable to the class. Style bits are also inherited from superclasses. |
| * </p> |
| * |
| * @param parent a composite control which will be the parent of the new |
| * instance (cannot be null) |
| * @param style the style of control to construct |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the |
| * thread that created the parent</li> |
| * </ul> |
| * |
| */ |
| public Calculator(final Composite parent, final int style) { |
| super(parent, style); |
| setLayout(new GridLayout()); |
| this.displayArea = createTextArea(); |
| this.panel = new CalculatorButtonsComposite(this, SWT.NONE); |
| this.panel.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, true)); |
| this.panel.setDisplayArea(this.displayArea); |
| this.displayArea.addKeyListener(this.panel.getKeyListener()); |
| } |
| |
| /** |
| * Create the text area. |
| * |
| * @return the label |
| */ |
| private Label createTextArea() { |
| final Label text = new Label(this, SWT.BORDER | SWT.RIGHT); |
| final GridData gd = new GridData(GridData.FILL, GridData.FILL, true, false); |
| gd.widthHint = 150; |
| text.setLayoutData(gd); |
| text.setText("0"); |
| text.setBackground(getDisplay().getSystemColor(SWT.COLOR_WHITE)); |
| return text; |
| } |
| |
| /** |
| * Adds the listener to the collection of listeners who will be notified |
| * when the receiver's text is modified, by sending it one of the messages |
| * defined in the <code>ModifyListener</code> interface. |
| * |
| * @param listener the listener which should be notified |
| * @see ModifyListener |
| * @see #removeModifyListener |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been |
| * disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the |
| * thread that created the receiver</li> |
| * </ul> |
| */ |
| public void addModifyListener(final ModifyListener listener) { |
| checkWidget(); |
| this.panel.addModifyListener(listener); |
| } |
| |
| /** |
| * Gets the value. |
| * |
| * @return the value |
| */ |
| public String getValue() { |
| checkWidget(); |
| return this.displayArea.getText(); |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will be |
| * notified when the receiver's text is modified. |
| * |
| * @param listener the listener which should no longer be notified |
| * @see ModifyListener |
| * @see #addModifyListener |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been |
| * disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the |
| * thread that created the receiver</li> |
| * </ul> |
| */ |
| public void removeModifyListener(final ModifyListener listener) { |
| checkWidget(); |
| this.panel.removeModifyListener(listener); |
| } |
| |
| /** |
| * Sets the value. |
| * |
| * @param value new value |
| * @throws NumberFormatException if <code>value</code> is not a valid float |
| * value |
| */ |
| public void setValue(final String value) { |
| checkWidget(); |
| this.displayArea.setText(value); |
| } |
| |
| } |