如何从java中的按钮面板更改JPanel中的paintcomponent
我很难弄清楚如何在绘图面板中更改绘画组件的颜色 我们需要使用的方法是,可以通过按钮面板更改油漆组件的颜色 问题是,我似乎找不到让处理程序识别面板并更改其颜色的方法 如何从java中的按钮面板更改JPanel中的paintcomponent main.java如何从java中的按钮面板更改JPanel中的paintcomponent,java,swing,jframe,panel,Java,Swing,Jframe,Panel,我很难弄清楚如何在绘图面板中更改绘画组件的颜色 我们需要使用的方法是,可以通过按钮面板更改油漆组件的颜色 问题是,我似乎找不到让处理程序识别面板并更改其颜色的方法 如何从java中的按钮面板更改JPanel中的paintcomponent main.java import javax.swing.SwingUtilities; public class main { public static void main(String[] args) { SwingUtilit
import javax.swing.SwingUtilities;
public class main {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Window();
}
});
}
}
import javax.swing.JFrame;
import java.awt.BorderLayout;
import java.awt.Dimension;
public class Window extends JFrame {
public Window () {
// `super ' calls a function inherited from the parent class ( JFrame )
super();
setTitle("Callbacks");
setSize (new Dimension(420, 350));
// Make sure the window appears in the middle of your screen
setLocationRelativeTo(null);
// Determines what should happen when the frame is closed
setDefaultCloseOperation (EXIT_ON_CLOSE);
// Chooses a certain layout type for the elements in this frame
getContentPane().setLayout (new BorderLayout());
// TODO : add elements to the content pane
DrawPanel dp = new DrawPanel ();
ButtonPanel bp = new ButtonPanel ();
// Places the DrawPanel in the center of the frame
getContentPane (). add (dp , BorderLayout . CENTER );
// Places the ButtonPanel in the top of the frame
getContentPane (). add (bp , BorderLayout . NORTH );
// Set the window to visible ! Yup ... This is necessary
setVisible (true);
}
}
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.*;
public class DrawPanel extends JPanel {
private Color color;
public DrawPanel(){
super();
color = Color.BLACK ;
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(getColor());
g.fillRect(100 , 30, 200 , 200);
}
}
import javax.swing.JButton;
import javax.swing.JPanel;
public class ButtonPanel extends JPanel {
public ButtonPanel () {
super ();
// Add a button to the panel . The argument to the JButton constructor
// will become the text on the button .
JButton b = new JButton ("Change color!");
JButton c = new JButton ("Test");
add (b);
add (c);
b.addActionListener(new InputHandler());
}
}
Window.java
import javax.swing.SwingUtilities;
public class main {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Window();
}
});
}
}
import javax.swing.JFrame;
import java.awt.BorderLayout;
import java.awt.Dimension;
public class Window extends JFrame {
public Window () {
// `super ' calls a function inherited from the parent class ( JFrame )
super();
setTitle("Callbacks");
setSize (new Dimension(420, 350));
// Make sure the window appears in the middle of your screen
setLocationRelativeTo(null);
// Determines what should happen when the frame is closed
setDefaultCloseOperation (EXIT_ON_CLOSE);
// Chooses a certain layout type for the elements in this frame
getContentPane().setLayout (new BorderLayout());
// TODO : add elements to the content pane
DrawPanel dp = new DrawPanel ();
ButtonPanel bp = new ButtonPanel ();
// Places the DrawPanel in the center of the frame
getContentPane (). add (dp , BorderLayout . CENTER );
// Places the ButtonPanel in the top of the frame
getContentPane (). add (bp , BorderLayout . NORTH );
// Set the window to visible ! Yup ... This is necessary
setVisible (true);
}
}
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.*;
public class DrawPanel extends JPanel {
private Color color;
public DrawPanel(){
super();
color = Color.BLACK ;
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(getColor());
g.fillRect(100 , 30, 200 , 200);
}
}
import javax.swing.JButton;
import javax.swing.JPanel;
public class ButtonPanel extends JPanel {
public ButtonPanel () {
super ();
// Add a button to the panel . The argument to the JButton constructor
// will become the text on the button .
JButton b = new JButton ("Change color!");
JButton c = new JButton ("Test");
add (b);
add (c);
b.addActionListener(new InputHandler());
}
}
DrawPanel.java
import javax.swing.SwingUtilities;
public class main {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Window();
}
});
}
}
import javax.swing.JFrame;
import java.awt.BorderLayout;
import java.awt.Dimension;
public class Window extends JFrame {
public Window () {
// `super ' calls a function inherited from the parent class ( JFrame )
super();
setTitle("Callbacks");
setSize (new Dimension(420, 350));
// Make sure the window appears in the middle of your screen
setLocationRelativeTo(null);
// Determines what should happen when the frame is closed
setDefaultCloseOperation (EXIT_ON_CLOSE);
// Chooses a certain layout type for the elements in this frame
getContentPane().setLayout (new BorderLayout());
// TODO : add elements to the content pane
DrawPanel dp = new DrawPanel ();
ButtonPanel bp = new ButtonPanel ();
// Places the DrawPanel in the center of the frame
getContentPane (). add (dp , BorderLayout . CENTER );
// Places the ButtonPanel in the top of the frame
getContentPane (). add (bp , BorderLayout . NORTH );
// Set the window to visible ! Yup ... This is necessary
setVisible (true);
}
}
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.*;
public class DrawPanel extends JPanel {
private Color color;
public DrawPanel(){
super();
color = Color.BLACK ;
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(getColor());
g.fillRect(100 , 30, 200 , 200);
}
}
import javax.swing.JButton;
import javax.swing.JPanel;
public class ButtonPanel extends JPanel {
public ButtonPanel () {
super ();
// Add a button to the panel . The argument to the JButton constructor
// will become the text on the button .
JButton b = new JButton ("Change color!");
JButton c = new JButton ("Test");
add (b);
add (c);
b.addActionListener(new InputHandler());
}
}
ButtonPanel.java
import javax.swing.SwingUtilities;
public class main {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Window();
}
});
}
}
import javax.swing.JFrame;
import java.awt.BorderLayout;
import java.awt.Dimension;
public class Window extends JFrame {
public Window () {
// `super ' calls a function inherited from the parent class ( JFrame )
super();
setTitle("Callbacks");
setSize (new Dimension(420, 350));
// Make sure the window appears in the middle of your screen
setLocationRelativeTo(null);
// Determines what should happen when the frame is closed
setDefaultCloseOperation (EXIT_ON_CLOSE);
// Chooses a certain layout type for the elements in this frame
getContentPane().setLayout (new BorderLayout());
// TODO : add elements to the content pane
DrawPanel dp = new DrawPanel ();
ButtonPanel bp = new ButtonPanel ();
// Places the DrawPanel in the center of the frame
getContentPane (). add (dp , BorderLayout . CENTER );
// Places the ButtonPanel in the top of the frame
getContentPane (). add (bp , BorderLayout . NORTH );
// Set the window to visible ! Yup ... This is necessary
setVisible (true);
}
}
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.*;
public class DrawPanel extends JPanel {
private Color color;
public DrawPanel(){
super();
color = Color.BLACK ;
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(getColor());
g.fillRect(100 , 30, 200 , 200);
}
}
import javax.swing.JButton;
import javax.swing.JPanel;
public class ButtonPanel extends JPanel {
public ButtonPanel () {
super ();
// Add a button to the panel . The argument to the JButton constructor
// will become the text on the button .
JButton b = new JButton ("Change color!");
JButton c = new JButton ("Test");
add (b);
add (c);
b.addActionListener(new InputHandler());
}
}
InputHandler
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import com.sun.prism.paint.Color;
public class InputHandler implements ActionListener {
public InputHandler() {
// TODO Auto-generated constructor stub
}
public void actionPerformed (ActionEvent e) {
// TODO : add code here that will
// be ran when the button is clicked
}
}
希望你们能帮助我,或者把我送到正确的方向。让他们成为朋友,这样
听众就可以知道面板了。
:
// Window
DrawPanel dp = new DrawPanel ();
ButtonPanel bp = new ButtonPanel (dp); // pass panel to button
然后:
以及:
然后:
主要的问题是,代码在没有实际需要的情况下扩展组件。这适用于窗口
和按钮面板
(虽然扩展绘图面板
)是有逻辑的。是的,这是我正在处理的作业的一部分。当我在寻找答案时,他们也没有扩展。通过一个表示您想要共享的数据的相互契约(即接口
)将两者绑定在一起,在契约中提供一个观察者模式,以便感兴趣的各方可以监视数据的更改并大量更新他们自己的签名!关于这个项目的最后一个问题是,是否有可能改变按键的形状?我必须使用油漆组件吗?当然,那么形状应该在外部描述到paintComponent