动态创建 JPanel
Dynamically create JPanels
我正在尝试制作一个具有 JTabbedPane 并显示 RF 网络上无线电之间的连接的 GUI。我无法弄清楚如何使 tabbedPanes 动态创建。我尝试了很多事情都没有成功。这是我到目前为止所拥有的。
这是抽奖class
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class draw extends JPanel implements MouseListener{
private Color currentColor = Color.RED;
//Array to hold the grid dimensions used for drawing radio[]
private int[] gD = {40, 100, 160, 220, 280, 340, 400, 460};
//Flag for changing colors in the grid
private boolean colorChanged = false;
public void drawing() {
repaint();
}
public void paintComponent(final Graphics g) {
super.paintComponent(g);
final Graphics2D g2d = (Graphics2D)g;
//Smooth Graphics
((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
//Quality Color Rendering
((Graphics2D) g).setRenderingHint(RenderingHints.KEY_COLOR_RENDERING,
RenderingHints.VALUE_COLOR_RENDER_QUALITY);
//Array to hold 40 radios
final Ellipse2D.Double radio[] = new Ellipse2D.Double[39];
//Array to hold lines that show radio connections
final Line2D connection[] = new Line2D[49];
/****************************************************************
This section of code draws the Ellipses that represent the
different radios.
*****************************************************************/
radio[0] = new Ellipse2D.Double(gD[2], gD[0], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[0]);
this.addMouseListener(this);
radio[1] = new Ellipse2D.Double(gD[1], gD[1], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[1]);
this.addMouseListener(this);
radio[2] = new Ellipse2D.Double(gD[0], gD[2], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[2]);
this.addMouseListener(this);
radio[3] = new Ellipse2D.Double(gD[1], gD[3], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[3]);
this.addMouseListener(this);
radio[4] = new Ellipse2D.Double(gD[2], gD[4], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[4]);
this.addMouseListener(this);
radio[5] = new Ellipse2D.Double(gD[5], gD[0], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[5]);
this.addMouseListener(this);
radio[6] = new Ellipse2D.Double(gD[6], gD[1], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[6]);
this.addMouseListener(this);
radio[7] = new Ellipse2D.Double(gD[7], gD[2], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[7]);
this.addMouseListener(this);
radio[8] = new Ellipse2D.Double(gD[6], gD[3], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[8]);
this.addMouseListener(this);
radio[9] = new Ellipse2D.Double(gD[5], gD[4], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[9]);
this.addMouseListener(this);
/****************************************************************
This section of code draws the lines that represent the
connections to the different radios.
*****************************************************************/
connection[0] = new Line2D.Double(radio[0].getCenterX(), radio[0].getCenterY(), radio[9].getCenterX(), radio[9].getCenterY());
g2d.draw(connection[0]);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
/**************************************************************************
This block of statements changes the radio buttons to green when clicked
and sets the colorChanged flag to true.
*************************************************************************/
if (!colorChanged && radio[0].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[2], gD[0], gD[0], gD[0]);
} else if (!colorChanged && radio[1].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[1], gD[1], gD[0], gD[0]);
} else if (!colorChanged && radio[2].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[0], gD[2], gD[0], gD[0]);
} else if (!colorChanged && radio[3].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[1], gD[3], gD[0], gD[0]);
} else if (!colorChanged && radio[4].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[2], gD[4], gD[0], gD[0]);
} else if (!colorChanged && radio[5].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[5], gD[0], gD[0], gD[0]);
} else if (!colorChanged && radio[6].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[6], gD[1], gD[0], gD[0]);
} else if (!colorChanged && radio[7].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[7], gD[2], gD[0], gD[0]);
} else if (!colorChanged && radio[8].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[6], gD[3], gD[0], gD[0]);
} else if (!colorChanged && radio[9].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[5], gD[4], gD[0], gD[0]);
/***************************************************************************
This block of statements changes the radio buttons to red when clicked
and sets the colorChanged flag to false
***************************************************************************/
} else if (colorChanged && radio[0].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[0], gD[0], gD[0]);
} else if (colorChanged && radio[1].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[1], gD[0], gD[0]);
} else if (colorChanged && radio[2].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[2], gD[0], gD[0]);
} else if (colorChanged && radio[3].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[3], gD[0], gD[0]);
} else if (colorChanged && radio[4].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[4], gD[0], gD[0]);
} else if (colorChanged && radio[5].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[0], gD[0], gD[0]);
} else if (colorChanged && radio[6].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[1], gD[0], gD[0]);
} else if (colorChanged && radio[7].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[2], gD[0], gD[0]);
} else if (colorChanged && radio[8].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[3], gD[0], gD[0]);
} else if (colorChanged && radio[9].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[4], gD[0], gD[0]);
}
}
});
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent mouseEvent) {
}
@Override
public void mouseReleased(MouseEvent mouseEvent) {
}
@Override
public void mouseEntered(MouseEvent mouseEvent) {
}
@Override
public void mouseExited(MouseEvent mouseEvent) {
}
}
这是首页class
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.*;
import javax.swing.JTabbedPane;
import javax.swing.JPanel;
import javax.swing.JFrame;
public class FrontPage extends JFrame{
private JPanel rootPanel;
private JButton buttonPushConfiguration;
private JTabbedPane tabbedPane;
public FrontPage() {
this.setBounds(new Rectangle(0, 0, 600, 600));
setContentPane(rootPanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
draw object = new draw();
//Creates the first tab
tabbedPane.addTab("Switch 1", object);
object.drawing();
buttonPushConfiguration.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(FrontPage.this, "Configuration Pushed to Panel");
}
});
}
}
这是主要的class
import javax.swing.*;
public class Main {
public static void main(String[] args) {
//Set the theme to the current system theme.
try {
UIManager.setLookAndFeel(
UIManager.getSystemLookAndFeelClassName());
}
catch(UnsupportedLookAndFeelException e){
// handle exception
}
catch(ClassNotFoundException e){
// handle exception
}
catch(InstantiationException e){
// handle exception
}
catch(IllegalAccessException e){
}
//Instantiates FrontPage
new FrontPage();
}
}
如果您的目标是在按钮的 ActionListener 中向 JTabbedPane 添加新的 JPanel，那么这正是您需要做的，例如：
@Override
public void actionPerformed(ActionEvent e) {
// int variable for the tab title
tabIndex++;
String title = "Switch " + tabIndex;
// I renamed your draw class to conform to Java standards
DrawPanel tabComponent = new DrawPanel();
tabbedPane.add(title, tabComponent);
}
如果您需要做更多，请告诉我们。我还必须重申我对你原来的评论 post:
- 您在绘画方法（这里是 paintComponent）中添加了一个 MouseListener，这是您永远不应该做的事情。当您真的只需要一个时，这可能会向 JPanel 添加许多 MouseListeners，实际上是无法控制的数量。仅在 paint 或 paintComponent 方法中进行绘制，仅此而已。
- 您上面的代码可以编译，但会在您尝试使用未初始化的组件时从许多位置抛出 NullPointerExceptions。请在 post 到这里之前尝试解决这个问题。
- 此外，您的 Ellipse2D 和 Line2D 数组应该成为实例字段，而不是局部于 paintComponent 方法。此外，您在 paintComponent 中重新添加了无数次 MouseListener，而不仅仅是一次。
- 您似乎试图一次解决太多问题，导致错误代码成倍增加。考虑改变你创建这个程序的方式——从简单开始，从第一原则开始，一次单独解决一个小问题，然后才将这些项目放在一个 GUI 中
MouseListener 更改点颜色的示例：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.*;
import java.awt.geom.Ellipse2D;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.swing.*;
@SuppressWarnings("serial")
public class DrawPanelMain extends JPanel {
private static final int PREF_W = 600;
private static final int PREF_H = PREF_W;
private List<Point> POINT_LIST = Arrays.asList(new Point[] {
new Point(160, 40),
new Point(100, 100),
new Point(40, 160),
new Point(100, 220),
new Point(160, 280),
new Point(340, 40),
new Point(400, 100),
new Point(460, 160),
new Point(400, 220),
new Point(340, 280)
});
private JTabbedPane tabbedPane = new JTabbedPane();
private int tabIndex = 0;
public DrawPanelMain() {
JPanel btnPanel = new JPanel();
btnPanel.add(new JButton(new PushConfigAction("Push Config")));
setLayout(new BorderLayout());
add(tabbedPane, BorderLayout.CENTER);
add(btnPanel, BorderLayout.PAGE_END);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
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) {
tabIndex++;
String title = "Switch " + tabIndex;
DrawPanel2 tabComponent = new DrawPanel2(POINT_LIST);
tabbedPane.add(title, tabComponent);
}
}
private static void createAndShowGui() {
DrawPanelMain mainPanel = new DrawPanelMain();
JFrame frame = new JFrame("DrawPanelMain");
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(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
@SuppressWarnings("serial")
class DrawPanel2 extends JPanel {
private static final int OVAL_WIDTH = 40;
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);
}
@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();
}
}
}
我正在尝试制作一个具有 JTabbedPane 并显示 RF 网络上无线电之间的连接的 GUI。我无法弄清楚如何使 tabbedPanes 动态创建。我尝试了很多事情都没有成功。这是我到目前为止所拥有的。
这是抽奖class
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class draw extends JPanel implements MouseListener{
private Color currentColor = Color.RED;
//Array to hold the grid dimensions used for drawing radio[]
private int[] gD = {40, 100, 160, 220, 280, 340, 400, 460};
//Flag for changing colors in the grid
private boolean colorChanged = false;
public void drawing() {
repaint();
}
public void paintComponent(final Graphics g) {
super.paintComponent(g);
final Graphics2D g2d = (Graphics2D)g;
//Smooth Graphics
((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
//Quality Color Rendering
((Graphics2D) g).setRenderingHint(RenderingHints.KEY_COLOR_RENDERING,
RenderingHints.VALUE_COLOR_RENDER_QUALITY);
//Array to hold 40 radios
final Ellipse2D.Double radio[] = new Ellipse2D.Double[39];
//Array to hold lines that show radio connections
final Line2D connection[] = new Line2D[49];
/****************************************************************
This section of code draws the Ellipses that represent the
different radios.
*****************************************************************/
radio[0] = new Ellipse2D.Double(gD[2], gD[0], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[0]);
this.addMouseListener(this);
radio[1] = new Ellipse2D.Double(gD[1], gD[1], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[1]);
this.addMouseListener(this);
radio[2] = new Ellipse2D.Double(gD[0], gD[2], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[2]);
this.addMouseListener(this);
radio[3] = new Ellipse2D.Double(gD[1], gD[3], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[3]);
this.addMouseListener(this);
radio[4] = new Ellipse2D.Double(gD[2], gD[4], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[4]);
this.addMouseListener(this);
radio[5] = new Ellipse2D.Double(gD[5], gD[0], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[5]);
this.addMouseListener(this);
radio[6] = new Ellipse2D.Double(gD[6], gD[1], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[6]);
this.addMouseListener(this);
radio[7] = new Ellipse2D.Double(gD[7], gD[2], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[7]);
this.addMouseListener(this);
radio[8] = new Ellipse2D.Double(gD[6], gD[3], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[8]);
this.addMouseListener(this);
radio[9] = new Ellipse2D.Double(gD[5], gD[4], gD[0], gD[0]);
g2d.setPaint(currentColor);
g2d.fill(radio[9]);
this.addMouseListener(this);
/****************************************************************
This section of code draws the lines that represent the
connections to the different radios.
*****************************************************************/
connection[0] = new Line2D.Double(radio[0].getCenterX(), radio[0].getCenterY(), radio[9].getCenterX(), radio[9].getCenterY());
g2d.draw(connection[0]);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
/**************************************************************************
This block of statements changes the radio buttons to green when clicked
and sets the colorChanged flag to true.
*************************************************************************/
if (!colorChanged && radio[0].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[2], gD[0], gD[0], gD[0]);
} else if (!colorChanged && radio[1].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[1], gD[1], gD[0], gD[0]);
} else if (!colorChanged && radio[2].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[0], gD[2], gD[0], gD[0]);
} else if (!colorChanged && radio[3].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[1], gD[3], gD[0], gD[0]);
} else if (!colorChanged && radio[4].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[2], gD[4], gD[0], gD[0]);
} else if (!colorChanged && radio[5].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[5], gD[0], gD[0], gD[0]);
} else if (!colorChanged && radio[6].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[6], gD[1], gD[0], gD[0]);
} else if (!colorChanged && radio[7].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[7], gD[2], gD[0], gD[0]);
} else if (!colorChanged && radio[8].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[6], gD[3], gD[0], gD[0]);
} else if (!colorChanged && radio[9].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.GREEN;
colorChanged = true;
repaint(gD[5], gD[4], gD[0], gD[0]);
/***************************************************************************
This block of statements changes the radio buttons to red when clicked
and sets the colorChanged flag to false
***************************************************************************/
} else if (colorChanged && radio[0].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[0], gD[0], gD[0]);
} else if (colorChanged && radio[1].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[1], gD[0], gD[0]);
} else if (colorChanged && radio[2].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[2], gD[0], gD[0]);
} else if (colorChanged && radio[3].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[3], gD[0], gD[0]);
} else if (colorChanged && radio[4].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[0], gD[4], gD[0], gD[0]);
} else if (colorChanged && radio[5].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[0], gD[0], gD[0]);
} else if (colorChanged && radio[6].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[1], gD[0], gD[0]);
} else if (colorChanged && radio[7].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[2], gD[0], gD[0]);
} else if (colorChanged && radio[8].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[3], gD[0], gD[0]);
} else if (colorChanged && radio[9].contains(e.getX(), e.getY())) {
e.getSource();
currentColor = Color.RED;
colorChanged = false;
repaint(gD[7], gD[4], gD[0], gD[0]);
}
}
});
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent mouseEvent) {
}
@Override
public void mouseReleased(MouseEvent mouseEvent) {
}
@Override
public void mouseEntered(MouseEvent mouseEvent) {
}
@Override
public void mouseExited(MouseEvent mouseEvent) {
}
}
这是首页class
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.*;
import javax.swing.JTabbedPane;
import javax.swing.JPanel;
import javax.swing.JFrame;
public class FrontPage extends JFrame{
private JPanel rootPanel;
private JButton buttonPushConfiguration;
private JTabbedPane tabbedPane;
public FrontPage() {
this.setBounds(new Rectangle(0, 0, 600, 600));
setContentPane(rootPanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
draw object = new draw();
//Creates the first tab
tabbedPane.addTab("Switch 1", object);
object.drawing();
buttonPushConfiguration.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(FrontPage.this, "Configuration Pushed to Panel");
}
});
}
}
这是主要的class
import javax.swing.*;
public class Main {
public static void main(String[] args) {
//Set the theme to the current system theme.
try {
UIManager.setLookAndFeel(
UIManager.getSystemLookAndFeelClassName());
}
catch(UnsupportedLookAndFeelException e){
// handle exception
}
catch(ClassNotFoundException e){
// handle exception
}
catch(InstantiationException e){
// handle exception
}
catch(IllegalAccessException e){
}
//Instantiates FrontPage
new FrontPage();
}
}
如果您的目标是在按钮的 ActionListener 中向 JTabbedPane 添加新的 JPanel，那么这正是您需要做的，例如：
@Override
public void actionPerformed(ActionEvent e) {
// int variable for the tab title
tabIndex++;
String title = "Switch " + tabIndex;
// I renamed your draw class to conform to Java standards
DrawPanel tabComponent = new DrawPanel();
tabbedPane.add(title, tabComponent);
}
如果您需要做更多，请告诉我们。我还必须重申我对你原来的评论 post:
- 您在绘画方法（这里是 paintComponent）中添加了一个 MouseListener，这是您永远不应该做的事情。当您真的只需要一个时，这可能会向 JPanel 添加许多 MouseListeners，实际上是无法控制的数量。仅在 paint 或 paintComponent 方法中进行绘制，仅此而已。
- 您上面的代码可以编译，但会在您尝试使用未初始化的组件时从许多位置抛出 NullPointerExceptions。请在 post 到这里之前尝试解决这个问题。
- 此外，您的 Ellipse2D 和 Line2D 数组应该成为实例字段，而不是局部于 paintComponent 方法。此外，您在 paintComponent 中重新添加了无数次 MouseListener，而不仅仅是一次。
- 您似乎试图一次解决太多问题，导致错误代码成倍增加。考虑改变你创建这个程序的方式——从简单开始，从第一原则开始，一次单独解决一个小问题，然后才将这些项目放在一个 GUI 中
MouseListener 更改点颜色的示例：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.*;
import java.awt.geom.Ellipse2D;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.swing.*;
@SuppressWarnings("serial")
public class DrawPanelMain extends JPanel {
private static final int PREF_W = 600;
private static final int PREF_H = PREF_W;
private List<Point> POINT_LIST = Arrays.asList(new Point[] {
new Point(160, 40),
new Point(100, 100),
new Point(40, 160),
new Point(100, 220),
new Point(160, 280),
new Point(340, 40),
new Point(400, 100),
new Point(460, 160),
new Point(400, 220),
new Point(340, 280)
});
private JTabbedPane tabbedPane = new JTabbedPane();
private int tabIndex = 0;
public DrawPanelMain() {
JPanel btnPanel = new JPanel();
btnPanel.add(new JButton(new PushConfigAction("Push Config")));
setLayout(new BorderLayout());
add(tabbedPane, BorderLayout.CENTER);
add(btnPanel, BorderLayout.PAGE_END);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
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) {
tabIndex++;
String title = "Switch " + tabIndex;
DrawPanel2 tabComponent = new DrawPanel2(POINT_LIST);
tabbedPane.add(title, tabComponent);
}
}
private static void createAndShowGui() {
DrawPanelMain mainPanel = new DrawPanelMain();
JFrame frame = new JFrame("DrawPanelMain");
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(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
@SuppressWarnings("serial")
class DrawPanel2 extends JPanel {
private static final int OVAL_WIDTH = 40;
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);
}
@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();
}
}
}