调整大小的JProgressBar如果JFrame的大小调整

Question

我想调整我JProgresbar当我调整我的JFrame

我JProgresBar的大小计算如下：

progressBar.setPreferredSize(new Dimension(getWidth() - 100, 50)); 

，但是当我调整的我JFrame的大小进度条将始终保持不变。

更新1

这是我的代码：

public class MinimalExampleJProgresbar { 
    public static void main(String[] args) { 
     JFrame frame = new JFrame("SimpleFrame"); 
     JPanel jPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); 
     JProgressBar progressBar = new JProgressBar(); 

     jPanel.add(progressBar); 
     frame.add(jPanel, BorderLayout.PAGE_START); 

     frame.setExtendedState(Frame.MAXIMIZED_BOTH); 
     frame.setVisible(true); 
     progressBar.setPreferredSize(new Dimension(frame.getWidth() - 100, 50)); 
     frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
    } 
} 

Answer 1

添加ComponentAdapter到你的框架

myFrame.addComponentListener(new ComponentAdapter() { 
    public void componentResized(ComponentEvent ev) { 
    progressBar.setPreferredSize(new Dimension(getWidth() - 100, 50)); 
    revalidate(); 
    repaint(); 
    } 
}); 

Answer 2

使用布局管理器，你的优势。例如，JFrame的contentPane使用BorderLayout。如果您将JProgressBar添加到此BorderLayout.PAGE_END或BorderLayout.PAGE_END位置，它将在其容器调整大小时自动调整大小。

import java.awt.BorderLayout; 
import java.awt.Dimension; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.*; 

public class SimpleFrame { 
    private static void createAndShowGUI() { 
     final JProgressBar progressBar = new JProgressBar(0, 100); 
     progressBar.setBorder(BorderFactory.createTitledBorder("My Progress")); 
     new Timer(200, new ActionListener() { 
     int value = 0; 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      value += 10; 
      if (value > 100) { 
       value = 0; 
      } 
      progressBar.setValue(value); 
     } 
     }).start(); 


     JFrame frame = new JFrame("SimpleFrame"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.add(progressBar, BorderLayout.PAGE_START); 
     frame.add(Box.createRigidArea(new Dimension(400, 300))); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      createAndShowGUI(); 
     } 
     }); 
    } 
} 

import java.awt.*; 
import javax.swing.*; 

public class MinimalExampleJProgresbar2 { 
    public static void main(String[] args) { 
     JFrame frame = new JFrame("SimpleFrame"); 
     JPanel wrapperPanel = new JPanel(new BorderLayout()); 

     JPanel jPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); 
     JProgressBar progressBar = new JProgressBar(); 

     wrapperPanel.add(progressBar, BorderLayout.PAGE_START); 
     wrapperPanel.add(jPanel, BorderLayout.CENTER); 

     frame.add(wrapperPanel, BorderLayout.PAGE_START); 

     frame.setExtendedState(Frame.MAXIMIZED_BOTH); 
     frame.setVisible(true); 
     progressBar.setPreferredSize(new Dimension(frame.getWidth() - 100, 50)); 
     frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
    } 
} 

import java.awt.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener;  
import javax.swing.*; 

public class MinimalExampleJProgresbar2 { 
    public static void main(String[] args) { 
     JFrame frame = new JFrame("SimpleFrame"); 
     JPanel wrapperPanel = new JPanel(new BorderLayout()); 

     JPanel jPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); 
     final JProgressBar progressBar = new JProgressBar(); 

     new Timer(200, new ActionListener() { 
      int value = 0; 

      @Override 
      public void actionPerformed(ActionEvent e) { 
      value += 10; 
      if (value > 100) { 
       value = 0; 
      } 
      progressBar.setValue(value); 
      } 
     }).start(); 

     JPanel boxUser = new JPanel(); 
     boxUser.setLayout(new BoxLayout(boxUser, BoxLayout.LINE_AXIS)); 
     boxUser.add(Box.createHorizontalStrut(50)); 
     boxUser.add(progressBar); 
     boxUser.add(Box.createHorizontalStrut(50)); 


     wrapperPanel.add(boxUser, BorderLayout.PAGE_START); 
     wrapperPanel.add(jPanel, BorderLayout.CENTER); 

     frame.add(wrapperPanel, BorderLayout.PAGE_START); 

     frame.setExtendedState(Frame.MAXIMIZED_BOTH); 
     frame.setVisible(true); 
     frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
    } 
}