fieldstringeditor.java

来自「测试工具」· Java 代码 · 共 132 行

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jmeter.testbeans.gui;

import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.beans.PropertyEditorSupport;

import javax.swing.JTextField;

import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;

/**
 * This class implements a property editor for non-null String properties that
 * supports custom editing (i.e.: provides a GUI component) based on a text
 * field.
 * <p>
 * The provided GUI is a simple text field.
 * 
 * @author <a href="mailto:[e-mail]">Jordi Salvat i Alabart</a>
 * @version $Revision: 493779 $ updated on $Date: 2007-01-07 17:46:38 +0000 (Sun, 07 Jan 2007) $
 */
class FieldStringEditor extends PropertyEditorSupport implements ActionListener, FocusListener {
	protected static Logger log = LoggingManager.getLoggerForClass();

	/**
	 * This will hold the text editing component, either a plain JTextField (in
	 * cases where the combo box would not have other options than 'Edit'), or
	 * the text editing component in the combo box.
	 */
	private JTextField textField;

	/**
	 * Value on which we started the editing. Used to avoid firing
	 * PropertyChanged events when there's not been such change.
	 */
	private String initialValue = "";

	protected FieldStringEditor() {
		super();

		textField = new JTextField();
		textField.addActionListener(this);
		textField.addFocusListener(this);
	}

	public String getAsText() {
		return textField.getText();
	}

	public void setAsText(String value) {
		initialValue = value;
		textField.setText(value);
	}

	public Object getValue() {
		return getAsText();
	}

	public void setValue(Object value) {
		if (value instanceof String)
			setAsText((String) value);
		else
			throw new IllegalArgumentException();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.beans.PropertyEditor#getCustomEditor()
	 */
	public Component getCustomEditor() {
		return textField;
	}

	/*
	 * (non-Javadoc) Avoid needlessly firing PropertyChanged events.
	 */
	public void firePropertyChange() {
		String newValue = getAsText();

		if (initialValue.equals(newValue))
			return;
		initialValue = newValue;

		super.firePropertyChange();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
	 */
	public void actionPerformed(ActionEvent e) {
		firePropertyChange();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.FocusListener#focusGained(java.awt.event.FocusEvent)
	 */
	public void focusGained(FocusEvent e) {
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.FocusListener#focusLost(java.awt.event.FocusEvent)
	 */
	public void focusLost(FocusEvent e) {
		firePropertyChange();
	}
}