我用来覆盖文本字段绘制方法,直到我最终得到更多的自定义文本字段然后我真的想…

然后我发现this prompt API易于使用,不需要你扩展任何组件.它还有一个很好的“伙伴”API

这已经被包含在SwingLabs,SwingX library中,这使得它甚至可以使用……

例如(这使用SwingX-1.6.4)

import java.awt.BorderLayout;

import java.awt.EventQueue;

import java.awt.Font;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import javax.swing.JFrame;

import javax.swing.JTextField;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import org.jdesktop.swingx.prompt.PromptSupport;

public class PromptExample {

public static void main(String[] args) {

new PromptExample();

}

public PromptExample() {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {

}

JTextField bunnies = new JTextField(10);

JTextField ponnies = new JTextField(10);

JTextField unicorns = new JTextField(10);

JTextField fairies = new JTextField(10);

PromptSupport.setPrompt("Bunnies", bunnies);

PromptSupport.setPrompt("Ponnies", ponnies);

PromptSupport.setPrompt("Unicorns", unicorns);

PromptSupport.setPrompt("Fairies", fairies);

PromptSupport.setFocusBehavior(PromptSupport.FocusBehavior.HIDE_PROMPT, bunnies);

PromptSupport.setFocusBehavior(PromptSupport.FocusBehavior.HIGHLIGHT_PROMPT, ponnies);

PromptSupport.setFocusBehavior(PromptSupport.FocusBehavior.SHOW_PROMPT, unicorns);

PromptSupport.setFontStyle(Font.BOLD, bunnies);

PromptSupport.setFontStyle(Font.ITALIC, ponnies);

PromptSupport.setFontStyle(Font.ITALIC | Font.BOLD, unicorns);

JFrame frame = new JFrame("Testing");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLayout(new GridBagLayout());

GridBagConstraints gbc = new GridBagConstraints();

gbc.gridwidth = GridBagConstraints.REMAINDER;

frame.add(bunnies, gbc);

frame.add(ponnies, gbc);

frame.add(unicorns, gbc);

frame.add(fairies, gbc);

frame.pack();

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

});

}

}