《Java 核心技术 卷1》 笔记 第九章 Swing 用户界面组件(6)

9.4.3 边框

边框：分隔出多个组别

可选效果：

• 凸出
• 凹陷
• 刻线
• 线条
• 粗线条

添加标题：

BoderFactory.createTitledBorder

组合边框：

BorderFacotory.createCompoundBorder

把边框添加到组件：

Border etched = BorderFactory.createEtchedBorder();

Border titled = BorderFactory.createEtchedBorder(etched, "A title");

Panel.setBorder(titled);

import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.*;

public class Main {
public static void main(String[] args) {
Main solution = new Main();

EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
BorderFrame frame = new BorderFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}

class BorderFrame extends JFrame{
private JPanel demoPanel;
private JPanel buttonPanel;
private ButtonGroup group;

private static final int SIZE = 12;
public BorderFrame(){
setTitle("BorderTest");
setSize(600,200);

demoPanel = new JPanel();
buttonPanel = new JPanel();
group = new ButtonGroup();

addRadioButton("Lower Level",BorderFactory.createLoweredBevelBorder());
addRadioButton("Raised Bevel",BorderFactory.createRaisedBevelBorder());
addRadioButton("Etched",BorderFactory.createEtchedBorder());
addRadioButton("Line",BorderFactory.createLineBorder(Color.BLUE));
addRadioButton("Matte",BorderFactory.createMatteBorder(10,10,10,10,Color.BLUE));
addRadioButton("Empty",BorderFactory.createEtchedBorder());

Border etched = BorderFactory.createEtchedBorder();
Border titled = BorderFactory.createTitledBorder(etched,"Border types");
buttonPanel.setBorder(titled);

setLayout(new GridLayout(2,1));
add(buttonPanel);
add(demoPanel);
}

private void addRadioButton(String buttonName, final Border b){
JRadioButton button = new JRadioButton(buttonName);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
demoPanel.setBorder(b);
}
});
group.add(button);
buttonPanel.add(button);
}
}

 

9.4.4 组合框

有时候我们希望既能编辑，又有下拉菜单的默认选项可以选择。这样有多个功能的编辑框，就佳作组合框。

import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.*;

public class Main {
public static void main(String[] args) {
Main solution = new Main();

EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
ComboBoxFrame frame = new ComboBoxFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}

class ComboBoxFrame extends JFrame{
private JComboBox faceCombo;
private JLabel label;
private static final int SIZE = 12;
public ComboBoxFrame(){
setTitle("ComboBoxTest");
setSize(600,200);

label = new JLabel("The quick brown fox jumps over the lazy dog.");
label.setFont(new Font("Serif",Font.PLAIN,SIZE));
add(label,BorderLayout.CENTER);

faceCombo = new JComboBox();
faceCombo.setEditable(true);
faceCombo.addItem("Serif");
faceCombo.addItem("SansSerif");
faceCombo.addItem("Monospaced");
faceCombo.addItem("Dialog");
faceCombo.addItem("DialogInput");

faceCombo.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
label.setFont(new Font((String)faceCombo.getSelectedItem(),Font.PLAIN,SIZE));
}
});

JPanel comboPanel = new JPanel();
comboPanel.add(faceCombo);
add(comboPanel, BorderLayout.SOUTH);
}
}

效果是：选中或输入已有元素，则自动设置成对应字体；输入不存在的字体时，默认选择第一个。

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