| /******************************************************************************* |
| * 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 java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.SWTException; |
| import org.eclipse.swt.events.KeyAdapter; |
| import org.eclipse.swt.events.KeyEvent; |
| import org.eclipse.swt.events.KeyListener; |
| 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.events.SelectionAdapter; |
| import org.eclipse.swt.events.SelectionEvent; |
| import org.eclipse.swt.graphics.Color; |
| import org.eclipse.swt.graphics.Point; |
| 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.Event; |
| import org.eclipse.swt.widgets.Label; |
| import org.mihalis.opal.utils.SWTGraphicUtil; |
| |
| /** |
| * This composite contains all buttons. |
| */ |
| class CalculatorButtonsComposite extends Composite { |
| |
| /** The Constant LABEL_C. */ |
| private static final String LABEL_C = "C"; |
| |
| /** The Constant LABEL_CE. */ |
| private static final String LABEL_CE = "CE"; |
| |
| /** The Constant LABEL_BACK. */ |
| private static final String LABEL_BACK = "Back"; |
| |
| /** The dark red color. */ |
| private final Color darkRedColor; |
| |
| /** The dark blue color. */ |
| private final Color darkBlueColor; |
| |
| /** The engine. */ |
| private final CalculatorEngine engine; |
| |
| /** The display area. */ |
| private Label displayArea; |
| |
| /** The key listener. */ |
| private KeyListener keyListener; |
| |
| /** The modify listeners. */ |
| private final List<ModifyListener> modifyListeners; |
| |
| /** |
| * Constructor. |
| * |
| * @param parent parent composite |
| * @param style style |
| */ |
| CalculatorButtonsComposite(final Composite parent, final int style) { |
| super(parent, style); |
| setLayout(new GridLayout(5, false)); |
| this.darkRedColor = new Color(getDisplay(), 139, 0, 0); |
| this.darkBlueColor = new Color(getDisplay(), 0, 0, 139); |
| createButtons(); |
| |
| SWTGraphicUtil.addDisposer(this, this.darkBlueColor); |
| SWTGraphicUtil.addDisposer(this, this.darkRedColor); |
| |
| this.engine = new CalculatorEngine(this); |
| addKeyListeners(); |
| this.modifyListeners = new ArrayList<ModifyListener>(); |
| } |
| |
| /** |
| * Create all buttons. |
| */ |
| private void createButtons() { |
| final Button buttonBackSpace = createButton(LABEL_BACK, this.darkRedColor); |
| buttonBackSpace.setLayoutData(new GridData(GridData.FILL, GridData.FILL, false, false, 3, 1)); |
| buttonBackSpace.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processBackSpace(); |
| } |
| }); |
| |
| final Button buttonCe = createButton(LABEL_CE, this.darkRedColor); |
| buttonCe.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.clearResult(); |
| } |
| }); |
| |
| final Button buttonC = createButton(LABEL_C, this.darkRedColor); |
| buttonC.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.clearWholeContent(); |
| } |
| }); |
| |
| createDigitButton(7); |
| createDigitButton(8); |
| createDigitButton(9); |
| |
| final Button buttonDivide = createButton(CalculatorEngine.OPERATOR_DIVIDE, getDisplay().getSystemColor(SWT.COLOR_RED)); |
| buttonDivide.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_DIVIDE); |
| } |
| }); |
| |
| final Button buttonSqrt = createButton("\u221A", this.darkRedColor); |
| buttonSqrt.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processSquareRootOperation(); |
| } |
| }); |
| |
| createDigitButton(4); |
| createDigitButton(5); |
| createDigitButton(6); |
| |
| final Button buttonMultiply = createButton(CalculatorEngine.OPERATOR_MULTIPLY, getDisplay().getSystemColor(SWT.COLOR_RED)); |
| buttonMultiply.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_MULTIPLY); |
| } |
| }); |
| final Button buttonInverse = createButton("1/x", this.darkBlueColor); |
| buttonInverse.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processInverseOperation(); |
| } |
| }); |
| |
| createDigitButton(1); |
| createDigitButton(2); |
| createDigitButton(3); |
| |
| final Button buttonMinus = createButton(CalculatorEngine.OPERATOR_MINUS, getDisplay().getSystemColor(SWT.COLOR_RED)); |
| buttonMinus.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_MINUS); |
| } |
| }); |
| |
| final Button buttonPercent = createButton("%", this.darkBlueColor); |
| buttonPercent.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processPerCentageOperation(); |
| } |
| }); |
| |
| createDigitButton(0); |
| |
| final Button buttonPlusMinus = createButton("+/-", getDisplay().getSystemColor(SWT.COLOR_BLUE)); |
| buttonPlusMinus.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processSignChange(); |
| } |
| }); |
| final Button buttonDot = createButton(".", getDisplay().getSystemColor(SWT.COLOR_BLUE)); |
| buttonDot.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.addDecimalPoint(); |
| } |
| }); |
| |
| final Button buttonPlus = createButton(CalculatorEngine.OPERATOR_PLUS, getDisplay().getSystemColor(SWT.COLOR_RED)); |
| buttonPlus.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_PLUS); |
| } |
| }); |
| |
| final Button buttonEquals = createButton("=", getDisplay().getSystemColor(SWT.COLOR_RED)); |
| buttonEquals.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.processEquals(); |
| } |
| }); |
| } |
| |
| /** |
| * Creates the digit button. |
| * |
| * @param digit the digit |
| */ |
| private void createDigitButton(final int digit) { |
| final Button button = createButton(" " + digit + " ", getDisplay().getSystemColor(SWT.COLOR_BLUE)); |
| button.addSelectionListener(new SelectionAdapter() { |
| /** |
| * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| @Override |
| public void widgetSelected(final SelectionEvent e) { |
| CalculatorButtonsComposite.this.engine.addDigitToDisplay(digit); |
| } |
| }); |
| |
| } |
| |
| /** |
| * Creates the button. |
| * |
| * @param label the label |
| * @param color the color |
| * @return the button |
| */ |
| private Button createButton(final String label, final Color color) { |
| final Button button = new Button(this, SWT.PUSH | SWT.DOUBLE_BUFFERED); |
| button.setText(""); |
| final GridData gd = new GridData(GridData.FILL, GridData.FILL, false, false); |
| gd.widthHint = 30; |
| button.setLayoutData(gd); |
| |
| // Use a paint listener because setForeground is not working on Windows |
| button.addPaintListener(new PaintListener() { |
| |
| @Override |
| public void paintControl(final PaintEvent e) { |
| e.gc.setForeground(color); |
| e.gc.setFont(getFont()); |
| final Point textSize = e.gc.textExtent(" " + label + " ", SWT.TRANSPARENT); |
| e.gc.drawText(" " + label + " ", (button.getBounds().width - textSize.x) / 2, (button.getBounds().height - textSize.y) / 2, true); |
| } |
| }); |
| |
| return button; |
| } |
| |
| /** |
| * Add key listeners. |
| */ |
| private void addKeyListeners() { |
| this.keyListener = new KeyAdapter() { |
| |
| /** |
| * @see org.eclipse.swt.events.KeyAdapter#keyReleased(org.eclipse.swt.events.KeyEvent) |
| */ |
| @Override |
| public void keyReleased(final KeyEvent e) { |
| switch (e.character) { |
| case '0': |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| case '8': |
| case '9': |
| CalculatorButtonsComposite.this.engine.addDigitToDisplay(Integer.parseInt(String.valueOf(e.character))); |
| return; |
| case '.': |
| CalculatorButtonsComposite.this.engine.addDecimalPoint(); |
| return; |
| case '+': |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_PLUS); |
| return; |
| case '-': |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_MINUS); |
| return; |
| case '*': |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_MULTIPLY); |
| return; |
| case '/': |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_DIVIDE); |
| return; |
| case '=': |
| CalculatorButtonsComposite.this.engine.processEquals(); |
| return; |
| case '%': |
| CalculatorButtonsComposite.this.engine.processPerCentageOperation(); |
| return; |
| |
| } |
| |
| switch (e.keyCode) { |
| case SWT.KEYPAD_0: |
| case SWT.KEYPAD_1: |
| case SWT.KEYPAD_2: |
| case SWT.KEYPAD_3: |
| case SWT.KEYPAD_4: |
| case SWT.KEYPAD_5: |
| case SWT.KEYPAD_6: |
| case SWT.KEYPAD_7: |
| case SWT.KEYPAD_8: |
| case SWT.KEYPAD_9: |
| final int digit = e.keyCode - SWT.KEYCODE_BIT - 47; |
| CalculatorButtonsComposite.this.engine.addDigitToDisplay(digit); |
| return; |
| case SWT.KEYPAD_ADD: |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_PLUS); |
| return; |
| case SWT.KEYPAD_SUBTRACT: |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_MINUS); |
| return; |
| case SWT.KEYPAD_DIVIDE: |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_DIVIDE); |
| return; |
| case SWT.KEYPAD_MULTIPLY: |
| CalculatorButtonsComposite.this.engine.processOperation(CalculatorEngine.OPERATOR_MULTIPLY); |
| return; |
| case SWT.KEYPAD_CR: |
| case SWT.KEYPAD_EQUAL: |
| case SWT.CR: |
| CalculatorButtonsComposite.this.engine.processEquals(); |
| return; |
| case SWT.KEYPAD_DECIMAL: |
| CalculatorButtonsComposite.this.engine.addDecimalPoint(); |
| return; |
| case SWT.BS: |
| CalculatorButtonsComposite.this.engine.processBackSpace(); |
| return; |
| case SWT.ESC: |
| CalculatorButtonsComposite.this.engine.clearWholeContent(); |
| return; |
| } |
| } |
| }; |
| |
| for (final Control control : this.getChildren()) { |
| control.addKeyListener(this.keyListener); |
| } |
| addKeyListener(this.keyListener); |
| |
| } |
| |
| /** |
| * 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(); |
| if (listener == null) { |
| SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| } |
| this.modifyListeners.add(listener); |
| } |
| |
| /** |
| * Fire the modify listeners. |
| */ |
| void fireModifyListeners() { |
| for (final ModifyListener listener : this.modifyListeners) { |
| final Event e = new Event(); |
| e.widget = this; |
| final ModifyEvent modifyEvent = new ModifyEvent(e); |
| listener.modifyText(modifyEvent); |
| } |
| } |
| |
| /** |
| * Gets the key listener. |
| * |
| * @return the keyListener |
| */ |
| KeyListener getKeyListener() { |
| return this.keyListener; |
| } |
| |
| /** |
| * Gets the display area. |
| * |
| * @return the text |
| */ |
| Label getDisplayArea() { |
| return this.displayArea; |
| } |
| |
| /** |
| * 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(); |
| if (listener == null) { |
| SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| } |
| this.modifyListeners.remove(listener); |
| } |
| |
| /** |
| * Sets the display area. |
| * |
| * @param text the text to set |
| */ |
| void setDisplayArea(final Label text) { |
| this.displayArea = text; |
| } |
| |
| } |
