Java tutorial
/* * =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jfreechart/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library 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 Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ------------------------ * SWTNumberAxisEditor.java * ------------------------ * (C) Copyright 2006, 2007, by Henry Proudhon and Contributors. * * Original Author: Henry Proudhon (henry.proudhon AT ensmp.fr); * Contributor(s): David Gilbert (for Object Refinery Limited); * * Changes * ------- * 01-Aug-2006 : New class (HP); */ package com.rcp.wbw.demo.editor; import org.eclipse.swt.SWT; import org.eclipse.swt.events.FocusEvent; import org.eclipse.swt.events.FocusListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; 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.Label; import org.eclipse.swt.widgets.TabItem; import org.eclipse.swt.widgets.Text; import org.jfree.chart.axis.Axis; import org.jfree.chart.axis.NumberAxis; /** * An editor for {@link NumberAxis} properties. */ class SWTNumberAxisEditor extends SWTAxisEditor implements FocusListener { /** * A flag that indicates whether or not the axis range is determined * automatically. */ private boolean autoRange; /** The lowest value in the axis range. */ private double minimumValue; /** The highest value in the axis range. */ private double maximumValue; /** * A checkbox that indicates whether or not the axis range is determined * automatically. */ private Button autoRangeCheckBox; /** A text field for entering the minimum value in the axis range. */ private Text minimumRangeValue; /** A text field for entering the maximum value in the axis range. */ private Text maximumRangeValue; /** * Creates a new editor. * * @param parent * the parent. * @param style * the style. * @param axis * the axis. */ public SWTNumberAxisEditor(Composite parent, int style, NumberAxis axis) { super(parent, style, axis); this.autoRange = axis.isAutoRange(); this.minimumValue = axis.getLowerBound(); this.maximumValue = axis.getUpperBound(); TabItem item2 = new TabItem(getOtherTabs(), SWT.NONE); item2.setText(" " + localizationResources.getString("Range") + " "); Composite range = new Composite(getOtherTabs(), SWT.NONE); range.setLayout(new GridLayout(2, true)); item2.setControl(range); this.autoRangeCheckBox = new Button(range, SWT.CHECK); this.autoRangeCheckBox.setText(localizationResources.getString("Auto-adjust_range")); this.autoRangeCheckBox.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1)); this.autoRangeCheckBox.setSelection(this.autoRange); this.autoRangeCheckBox.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { toggleAutoRange(); } }); new Label(range, SWT.NONE).setText(localizationResources.getString("Minimum_range_value")); this.minimumRangeValue = new Text(range, SWT.BORDER); this.minimumRangeValue.setText(String.valueOf(this.minimumValue)); this.minimumRangeValue.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); this.minimumRangeValue.setEnabled(!this.autoRange); // this.minimumRangeValue.addModifyListener(this); // this.minimumRangeValue.addVerifyListener(this); this.minimumRangeValue.addFocusListener(this); new Label(range, SWT.NONE).setText(localizationResources.getString("Maximum_range_value")); this.maximumRangeValue = new Text(range, SWT.BORDER); this.maximumRangeValue.setText(String.valueOf(this.maximumValue)); this.maximumRangeValue.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); this.maximumRangeValue.setEnabled(!this.autoRange); // this.maximumRangeValue.addModifyListener(this); // this.maximumRangeValue.addVerifyListener(this); this.maximumRangeValue.addFocusListener(this); } /** * Toggle the auto range setting. */ public void toggleAutoRange() { this.autoRange = this.autoRangeCheckBox.getSelection(); if (this.autoRange) { this.minimumRangeValue.setText(Double.toString(this.minimumValue)); this.minimumRangeValue.setEnabled(false); this.maximumRangeValue.setText(Double.toString(this.maximumValue)); this.maximumRangeValue.setEnabled(false); } else { this.minimumRangeValue.setEnabled(true); this.maximumRangeValue.setEnabled(true); } } /** * Revalidate the range minimum: * it should be less than the current maximum. * * @param candidate * the minimum value * * @return A boolean. */ public boolean validateMinimum(String candidate) { boolean valid = true; try { if (Double.parseDouble(candidate) >= this.maximumValue) { valid = false; } } catch (NumberFormatException e) { valid = false; } return valid; } /** * Revalidate the range maximum: * it should be greater than the current minimum * * @param candidate * the maximum value * * @return A boolean. */ public boolean validateMaximum(String candidate) { boolean valid = true; try { if (Double.parseDouble(candidate) <= this.minimumValue) { valid = false; } } catch (NumberFormatException e) { valid = false; } return valid; } /* * (non-Javadoc) * * @see org.eclipse.swt.events.FocusListener#focusGained( * org.eclipse.swt.events.FocusEvent) */ public void focusGained(FocusEvent e) { // don't need to do anything } /* * (non-Javadoc) * * @see org.eclipse.swt.events.FocusListener#focusLost( * org.eclipse.swt.events.FocusEvent) */ public void focusLost(FocusEvent e) { if (e.getSource() == this.minimumRangeValue) { // verify min value if (!validateMinimum(this.minimumRangeValue.getText())) this.minimumRangeValue.setText(String.valueOf(this.minimumValue)); else this.minimumValue = Double.parseDouble(this.minimumRangeValue.getText()); } else if (e.getSource() == this.maximumRangeValue) { // verify max value if (!validateMaximum(this.maximumRangeValue.getText())) this.maximumRangeValue.setText(String.valueOf(this.maximumValue)); else this.maximumValue = Double.parseDouble(this.maximumRangeValue.getText()); } } /** * Sets the properties of the specified axis to match * the properties defined on this panel. * * @param axis * the axis. */ public void setAxisProperties(Axis axis) { super.setAxisProperties(axis); NumberAxis numberAxis = (NumberAxis) axis; numberAxis.setAutoRange(this.autoRange); if (!this.autoRange) { numberAxis.setRange(this.minimumValue, this.maximumValue); } } }