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我一直在試圖讓一些JLabel在JPanel上編號行數日，現在沒有快樂。我曾嘗試過所有我能想到的佈局管理器。目前我有最好的結果（這不是我想要的）與GridLayout。請幫忙！JLabel on JPanel pause
有問題的區域是AddLabels（）方法。
問題：如何獲得下面代碼中的JLabel以與每一行對齊？
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.util.*;
import java.util.List;
@SuppressWarnings("serial")
public class DrawPanelMain extends JPanel {
private static final int PREF_W = 1200;
private static final int PREF_H = 700;
//Points for Ellipse2D
private List<Point> POINT_LIST = Arrays.asList(
new Point(60, 40),
new Point(60, 100),
new Point(60, 160),
new Point(60, 220),
new Point(60, 280),
new Point(60, 340),
new Point(60, 400),
new Point(60, 460),
new Point(60, 520),
new Point(60, 580),
new Point(120, 100),
new Point(120, 160),
new Point(120, 220),
new Point(120, 280),
new Point(120, 340),
new Point(120, 400),
new Point(120, 460),
new Point(120, 520),
new Point(120, 580),
new Point(180, 160),
new Point(180, 220),
new Point(180, 280),
new Point(180, 340),
new Point(180, 400),
new Point(180, 460),
new Point(180, 520),
new Point(180, 580),
new Point(240, 220),
new Point(240, 280),
new Point(240, 340),
new Point(240, 400),
new Point(240, 460),
new Point(240, 520),
new Point(240, 580),
new Point(300, 280),
new Point(300, 340),
new Point(300, 400),
new Point(300, 460),
new Point(300, 520),
new Point(300, 580),
new Point(360, 340),
new Point(360, 400),
new Point(360, 460),
new Point(360, 520),
new Point(360, 580),
new Point(420, 400),
new Point(420, 460),
new Point(420, 520),
new Point(420, 580),
new Point(480, 460),
new Point(480, 520),
new Point(480, 580),
new Point(540, 520),
new Point(540, 580),
new Point(600, 580));
//Points for labels
private List<Point> POINT_LIST2 = Arrays.asList(
new Point (20, 40),
new Point (20, 100),
new Point (20, 160));
private JTabbedPane tabbedPane = new JTabbedPane();
private int tabIndex = 0;
public DrawPanelMain() {
JPanel btnPanel = new JPanel();
JPanel infoPanel = new JPanel();
btnPanel.add(new JButton(new AddSwitchAction("Add Switch Panel")));
btnPanel.add(new JButton(new PushConfigAction("Push Config")));
btnPanel.add(new JButton(new ActivateAllAction("Activate All")));
infoPanel.add(new JTextField(20));
setLayout(new BorderLayout());
add(tabbedPane, BorderLayout.CENTER);
add(btnPanel, BorderLayout.PAGE_END);
add(infoPanel, BorderLayout.EAST);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private class AddSwitchAction extends AbstractAction {
public AddSwitchAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
tabIndex++;
String title = "Switch " + tabIndex;
DrawPanel2 tabComponent = new DrawPanel2(POINT_LIST);
DrawLabels tabComponent2 = new DrawLabels(POINT_LIST2);
tabbedPane.add(title, tabComponent);
}
}
private class PushConfigAction extends AbstractAction {
public PushConfigAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
/*Add code sending the configuration to the switch panel*/
JOptionPane.showMessageDialog(DrawPanelMain.this, "Configuration Pushed to Panel");
}
}
private class ActivateAllAction extends AbstractAction {
public ActivateAllAction(String name) {
super(name);
int mnemonic = (int) name.charAt(1);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
Component comp = tabbedPane.getSelectedComponent();
if (comp instanceof DrawPanel2) {
DrawPanel2 drawPanel = (DrawPanel2) comp;
drawPanel.activateAll();
}
}
}
private static void createAndShowGui() {
DrawPanelMain mainPanel = new DrawPanelMain();
final double version = 0.1;
JFrame frame = new JFrame("RF Connection Panel " + version);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
@SuppressWarnings("serial")
class DrawPanel2 extends JPanel {
private static final int OVAL_WIDTH = 30;
private static final Color INACTIVE_COLOR = Color.RED;
private static final Color ACTIVE_COLOR = Color.green;
private List<Point> points;
private List<Ellipse2D> ellipses = new ArrayList<>();
private Map<Ellipse2D, Color> ellipseColorMap = new HashMap<>();
public DrawPanel2(List<Point> points) {
this.points = points;
for (Point p : points) {
int x = p.x - OVAL_WIDTH/2;
int y = p.y - OVAL_WIDTH/2;
int w = OVAL_WIDTH;
int h = OVAL_WIDTH;
Ellipse2D ellipse = new Ellipse2D.Double(x, y, w, h);
ellipses.add(ellipse);
ellipseColorMap.put(ellipse, INACTIVE_COLOR);
}
MyMouseAdapter mListener = new MyMouseAdapter();
addMouseListener(mListener);
addMouseMotionListener(mListener);
setLayout(new GridLayout(12, 4, 0, 0));
setBorder(new EmptyBorder(10, 10, 0, 0));
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
for (Ellipse2D ellipse : ellipses) {
g2.setColor(ellipseColorMap.get(ellipse));
g2.fill(ellipse);
}
}
private class MyMouseAdapter extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
for (Ellipse2D ellipse : ellipses) {
if (ellipse.contains(e.getPoint())) {
Color c = ellipseColorMap.get(ellipse);
c = (c == INACTIVE_COLOR) ? ACTIVE_COLOR : INACTIVE_COLOR;
ellipseColorMap.put(ellipse, c);
}
}
repaint();
}
}
public void activateAll() {
for (Ellipse2D ellipse : ellipses) {
ellipseColorMap.put(ellipse, ACTIVE_COLOR);
}
repaint();
}
}
@SuppressWarnings("serial")
class DrawLabels extends JPanel {
private List<Point> points2;
private List<JLabel> jLabels = new ArrayList<>();
private int i = 0;
public DrawLabels(List<Point> points2) {
this.points2 = points2;
for (Point p : points2) {
JLabel jLabel = new JLabel("Row" + i);
jLabels.add(jLabel);
i++;
}
}
}
一個解決方案與點面板：唐不使用JLabels。而是通過paintComponent繪製標籤，就像繪製點一樣。 –
@HovercraftFullOfEels謝謝我會努力。 – feltersnach
@HovercraftFullOfEels我嘗試你的方法後，我編輯了帖子最近的代碼，它不填充標籤，當我添加組件到tabbedPane它使一個空白選項卡。我錯過了什麼？ – feltersnach