...该应用程序大约有 15 个 GUI 页面。我可以使用分层窗格和选项卡式窗格将所有 GUI 组件放在一个类中。但这个班级将会很大。
不必要。 GUI 可能非常简单,并且可以有一个方法允许其他类添加页面,比如称为registerPage(...)
:
public void registerPage(JComponent page, String name) {
pageHolder.add(page, name);
nameComboModel.addElement(name);
}
然后提供类方法以允许转到下一页或上一页或随机页面。例如,像这样小的类就可以工作:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class LotsOfPagesPanel extends JPanel {
private CardLayout cardlayout = new CardLayout();
private JPanel pageHolder = new JPanel(cardlayout);
private DefaultComboBoxModel<String> nameComboModel = new DefaultComboBoxModel<String>();
private JComboBox<String> nameCombo = new JComboBox<String>(nameComboModel);
public LotsOfPagesPanel() {
JPanel btnPanel = new JPanel(new GridLayout(1, 0, 5, 0));
btnPanel.add(new JButton(new PrevAction(this, "Previous", KeyEvent.VK_P)));
btnPanel.add(new JButton(new NextAction(this, "Next", KeyEvent.VK_N)));
JPanel bottomPanel = new JPanel();
bottomPanel.add(btnPanel);
bottomPanel.add(nameCombo);
nameCombo.addActionListener(new NameComboListener());
pageHolder.setBorder(BorderFactory.createEtchedBorder());
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
setLayout(new BorderLayout(5, 5));
add(pageHolder, BorderLayout.CENTER);
add(bottomPanel, BorderLayout.PAGE_END);
}
public void previousPage() {
cardlayout.previous(pageHolder);
}
public void nextPage() {
cardlayout.next(pageHolder);
}
public void show(String name) {
cardlayout.show(pageHolder, name);
}
public void registerPage(JComponent page, String name) {
pageHolder.add(page, name);
nameComboModel.addElement(name);
}
private class NameComboListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
String selection = nameCombo.getSelectedItem().toString();
show(selection);
}
}
}
这个类真正做的就是充当“页面”的存储库,并且具有允许连续或随机翻阅页面的逻辑,没有太多其他内容,但这就是它真正需要做的,通过限制它,我们限制班级规模。如果需要其他功能,请为这些功能创建其他类
...例如我们的 Action 类,包括 PrevAction 类:
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
public class PrevAction extends AbstractAction {
private LotsOfPagesPanel lotsOfPages;
public PrevAction(LotsOfPagesPanel lotsOfPages, String name, Integer keyCode) {
super(name);
this.lotsOfPages = lotsOfPages;
putValue(MNEMONIC_KEY, keyCode);
}
@Override
public void actionPerformed(ActionEvent e) {
lotsOfPages.previousPage();
}
}
和 NextAction.java
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
public class NextAction extends AbstractAction {
private LotsOfPagesPanel lotsOfPages;
public NextAction(LotsOfPagesPanel lotsOfPages, String name, Integer keyCode) {
super(name);
this.lotsOfPages = lotsOfPages;
putValue(MNEMONIC_KEY, keyCode);
}
@Override
public void actionPerformed(ActionEvent e) {
lotsOfPages.nextPage();
}
}
当然,你需要有一个 main 方法:
import java.awt.Color;
import java.awt.Dimension;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
public class LotsOfPagesMain {
private static final String[] LABELS = { "One", "Two", "Three", "Four",
"Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve",
"Thirteen", "Fourteen", "Fifteen" };
private static final Dimension LABEL_SIZE = new Dimension(400, 300);
private static void createAndShowGui() {
LotsOfPagesPanel lotsOfPages = new LotsOfPagesPanel();
Random random = new Random();
// I'm using JLabels as a simple substitute for your complex JPanel GUI "pages"
for (String labelText : LABELS) {
JLabel label = new JLabel(labelText, SwingConstants.CENTER);
label.setPreferredSize(LABEL_SIZE);
label.setOpaque(true);
label.setBackground(new Color(random.nextInt(170) + 85, random
.nextInt(170) + 85, random.nextInt(170) + 85));
lotsOfPages.registerPage(label, labelText);
}
JFrame frame = new JFrame("LotsOfPages");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(lotsOfPages);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
但无论如何它都不会是一个巨大的类,并且您不必担心向用户翻转多个 JFrame。