swing JTextField hint 표시 소스

요즘 한창 스윙으로 삽질중인데 안드로이드에서 기본적으로 제공하는 기능들을 스윙에서는 제공하질 않는다.

이런것들 떔에 커스텀으로 직접 구현해줘야되는데 JTextField의 hint기능도 마찬가지다.

일단 클래스를 하나 만들어서 다음과 같이 작성한다.

package com.dinnovan.skbopenapi.simulator.common;

import java.awt.Color;

import java.awt.event.FocusEvent;

import java.awt.event.FocusListener;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import javax.swing.JTextField;

import javax.swing.event.DocumentEvent;

import javax.swing.event.DocumentListener;

public class TextHint implements FocusListener, DocumentListener, PropertyChangeListener {

private final JTextField textfield;

private boolean isEmpty;

private Color hintColor;

private Color foregroundColor;

private final String hintText;

public TextHint(final JTextField textfield, String hintText) {

super();

this.textfield = textfield;

this.hintText = hintText;

this.hintColor = Color.LIGHT_GRAY;

textfield.addFocusListener(this);

registerListeners();

updateState();

if (!this.textfield.hasFocus()) {

focusLost(null);

}

}

public void delete() {

unregisterListeners();

textfield.removeFocusListener(this);

}

private void registerListeners() {

textfield.getDocument().addDocumentListener(this);

textfield.addPropertyChangeListener("foreground", this);

}

private void unregisterListeners() {

textfield.getDocument().removeDocumentListener(this);

textfield.removePropertyChangeListener("foreground", this);

}

public Color getGhostColor() {

return hintColor;

}

public void setGhostColor(Color hintColor) {

this.hintColor = hintColor;

}

private void updateState() {

isEmpty = textfield.getText().length() == 0;

foregroundColor = textfield.getForeground();

}

@Override

public void focusGained(FocusEvent e) {

if (isEmpty) {

unregisterListeners();

try {

textfield.setText("");

textfield.setForeground(foregroundColor);

} finally {

registerListeners();

}

}

}

@Override

public void focusLost(FocusEvent e) {

if (isEmpty) {

unregisterListeners();

try {

textfield.setText(hintText);

textfield.setForeground(hintColor);

} finally {

registerListeners();

}

}

}

@Override

public void propertyChange(PropertyChangeEvent evt) {

updateState();

}

@Override

public void changedUpdate(DocumentEvent e) {

updateState();

}

@Override

public void insertUpdate(DocumentEvent e) {

updateState();

}

@Override

public void removeUpdate(DocumentEvent e) {

updateState();

}

}

사용은 TextHint hint = new TextHint(JTextField, String); 로 사용하면 된다.