Java堆棧組件

我正在用Java編寫一個具有UI的程序。我想製作一種健康吧的東西。我必須JLabel s HealthBarUnder和HealthBarOver。我想將它們放在彼此的頂部，這樣我就可以減少HealthBarOver的寬度（從而使健康欄的外觀）。什麼是最好的佈局使用。我正在使用BorderLayout，但它不會讓我重新調整組件大小。Java堆棧組件

謝謝

來源

2013-02-28 user1976336

'GridBagLayout'可以做到這一點，但它可能是eaiser簡單地使用['JProgressBar' ]（http://docs.oracle.com/javase/tutorial/uiswing/components/progress.html） – MadProgrammer 2013-02-28 00:43:59

CardLayout？........... – 2013-02-28 00:50:25

我會用這個小方法，以及給出更手動方法：

private void addComponent(Container container, Component c, int x, int y,int width, int height) { 

    c.setBounds(x, y, width, height); 
    container.add(c); 
}

，並調用它是這樣的：

addComponent(container such as JPanel, component such as a JButton, x position, yposition, width, height);

來源

2013-02-28 00:48:08 DOWmad

BoxLayout如何疊加組件？ – MadProgrammer 2013-02-28 00:49:17

愚蠢的答案我給了，對不起， – DOWmad 2013-02-28 00:54:16

別擔心，它嚇壞了我：P – MadProgrammer 2013-02-28 00:56:59

你「能」做像這樣...

enter image description here

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import java.awt.Insets; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.text.NumberFormat; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.Timer; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 
import javax.swing.border.LineBorder; 

public class SlidingLabels { 

    public static void main(String[] args) { 
     new SlidingLabels(); 
    } 

    public SlidingLabels() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
       } 

       JFrame frame = new JFrame("Testing"); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setLayout(new BorderLayout()); 
       frame.add(new TestPane()); 
       frame.pack(); 
       frame.setLocationRelativeTo(null); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    public class TestPane extends JPanel { 

     private JLabel lower = new JLabel(); 
     private JLabel upper = new JLabel(); 

     private float progress = 1f; 
     private boolean ignoreUpdates; 

     public TestPane() { 
      setLayout(new GridBagLayout()); 
      lower.setOpaque(true); 
      lower.setBackground(Color.GRAY); 
      lower.setBorder(new LineBorder(Color.BLACK)); 
      lower.setPreferredSize(new Dimension(200, 25)); 

      upper.setOpaque(true); 
      upper.setBackground(Color.BLUE); 
      upper.setBorder(new LineBorder(Color.BLACK)); 
      upper.setPreferredSize(new Dimension(200, 25)); 

      GridBagConstraints gbc = new GridBagConstraints(); 
      gbc.weightx = 1; 
      gbc.gridx = 0; 
      gbc.gridy = 0; 
      gbc.anchor = GridBagConstraints.WEST; 
      gbc.fill = GridBagConstraints.NONE; 
      add(upper, gbc); 
      gbc.fill = GridBagConstraints.HORIZONTAL; 
      add(lower, gbc); 

      Timer timer = new Timer(500, new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        progress -= 0.01; 
        if (progress <= 0.001) { 
         ((Timer)e.getSource()).stop(); 
        } 
        updateProgress(); 
       } 
      }); 
      timer.setRepeats(true); 
      timer.setCoalesce(true); 
      timer.start(); 
     } 

     @Override 
     public Dimension getPreferredSize() { 
      return new Dimension(200, 200); 
     } 

     protected void updateProgress() { 
      ignoreUpdates = true; 
      int width = (int) (getWidth() * progress); 
      upper.setPreferredSize(new Dimension(width, 25)); 
      revalidate(); 
      repaint(); 
      ignoreUpdates = false; 
     } 

     @Override 
     public void invalidate() { 
      super.invalidate(); 
      if (!ignoreUpdates) { 
       updateProgress(); 
      } 
     } 

    } 
}

，但它使用了一些討厭的黑客，並可能會在你面對提前而後來炸燬....

您應該使用JProgressBar

enter image description here

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import java.awt.Insets; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JProgressBar; 
import javax.swing.Timer; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 
import javax.swing.border.LineBorder; 

public class ProgressBar { 

    public static void main(String[] args) { 
     new ProgressBar(); 
    } 

    public ProgressBar() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
       } 

       JFrame frame = new JFrame("Testing"); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setLayout(new BorderLayout()); 
       frame.add(new TestPane()); 
       frame.pack(); 
       frame.setLocationRelativeTo(null); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    public class TestPane extends JPanel { 

     private JProgressBar pb; 
     private float progress = 1f; 

     public TestPane() { 
      setLayout(new GridBagLayout()); 

      pb = new JProgressBar(); 
      pb.setBorderPainted(false); 
      pb.setStringPainted(true); 
      pb.setBorder(new LineBorder(Color.BLACK)); 
      pb.setForeground(Color.BLUE); 
      pb.setBackground(Color.GRAY); 

      GridBagConstraints gbc = new GridBagConstraints(); 
      gbc.weightx = 1; 
      gbc.insets = new Insets(4, 4, 4, 4); 
      gbc.gridx = 0; 
      gbc.gridy = 0; 
      gbc.fill = GridBagConstraints.HORIZONTAL; 
      add(pb, gbc); 

      updateProgress(); 
      Timer timer = new Timer(500, new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        progress -= 0.01; 
        if (progress <= 0.001) { 
         ((Timer)e.getSource()).stop(); 
        } 
        updateProgress(); 
       } 
      }); 
      timer.setRepeats(true); 
      timer.setCoalesce(true); 
      timer.start(); 
     } 

     @Override 
     public Dimension getPreferredSize() { 
      return new Dimension(200, 200); 
     } 

     protected void updateProgress() { 
      pb.setValue((int) (100 * progress)); 
     } 

    } 
}

但是，如果這不符合您的需求，您會更好地編寫自己的進度組件...

enter image description here

public class ProgressPane { 

    public static void main(String[] args) { 
     new ProgressPane(); 
    } 

    public ProgressPane() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
       } 

       JFrame frame = new JFrame("Testing"); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setLayout(new GridBagLayout()); 
       frame.add(new TestPane()); 
       frame.pack(); 
       frame.setLocationRelativeTo(null); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    public class TestPane extends JPanel { 

     private float progress = 1f; 

     public TestPane() { 

      setOpaque(false); 

      setForeground(Color.BLUE); 
      setBackground(Color.GRAY); 

      Timer timer = new Timer(500, new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        progress -= 0.01; 
        if (progress <= 0.001) { 
         ((Timer)e.getSource()).stop(); 
        } 
        repaint(); 
       } 
      }); 
      timer.setRepeats(true); 
      timer.setCoalesce(true); 
      timer.start(); 
     } 

     @Override 
     public Dimension getPreferredSize() { 
      FontMetrics fm = getFontMetrics(getFont()); 
      return new Dimension(200, fm.getHeight() + 4); 
     } 

     @Override 
     protected void paintComponent(Graphics g) { 
      super.paintComponent(g); 

      int width = getWidth() - 4; 
      int height = getHeight() - 4; 
      int x = 2; 
      int y = 2; 

      g.setColor(getBackground()); 
      g.fillRect(x, y, width, height); 
      g.setColor(Color.BLACK); 
      g.drawRect(x, y, width, height); 

      g.setColor(getForeground()); 
      g.fillRect(x, y, (int) (width * progress), height); 
      g.setColor(Color.BLACK); 
      g.drawRect(x, y, (int) (width * progress), height); 

      FontMetrics fm = g.getFontMetrics(); 
      String value = NumberFormat.getPercentInstance().format(progress); 
      x = x + ((width - fm.stringWidth(value))/2); 
      y = y + ((height - fm.getHeight())/2); 

      g.setColor(Color.WHITE); 
      g.drawString(value, x, y + fm.getAscent()); 

     } 

    } 
}

我會HIGHLY建議的最後兩個例子中的一個，他們是更簡單的實現和維護隨着時間的推移。第一個會爆炸，很不好過，在你的臉上

PS- Kleo，請不要傷害我:(

來源

2013-02-28 02:48:43 MadProgrammer

好吧，那麼你將如何設置進度條的圖像，而不是普通的顏色... – user1976336 2013-02-28 23:02:51

我可能會使用第三個例子這種情況下......否則你需要爲'JProgressBar'編寫一個新的UI實現，但這可能會有效t應用程序中的所有'JProgressBar's – MadProgrammer 2013-02-28 23:12:03

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