更新JFrame內容

Question

如何在按鈕單擊時更新JFrame的內容。我正在構建一個圖像查看器，其中將顯示photopath列表，用戶將不得不點擊下一個或上一個按鈕來回查看圖像。如何更改圖像和更新Jframe下面是我目前的實現。我試圖擺脫當前的框架，並作出新的，但這不是我正在尋找... 包cs213.photoAlbum.simpleview;

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Container; 
import java.awt.Dimension; 
import java.awt.Image; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.WindowAdapter; 
import java.awt.event.WindowEvent; 
import java.util.*; 

import javax.swing.ImageIcon; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JSlider; 
import javax.swing.event.ChangeEvent; 
import javax.swing.event.ChangeListener; 

import model.photoNode; 

public class ImageViewer { 

    private JFrame frame = new JFrame("Image Viewer"); 
    private Container pane = frame.getContentPane(); 
    private JPanel imgViewPanel = new JPanel(); 
    JSlider slider = new JSlider(0, 100, 100); 
    JLabel percent = new JLabel("100%"); 

    String imageFile = ""; 

    private class ImageView extends JScrollPane { 

     JPanel panel = new JPanel(); 
     Dimension originalSize = new Dimension(); 
     Image originalImage; 
     JLabel iconLabel; 

     public ImageView(ImageIcon icon) { 

      this.originalImage = icon.getImage(); 

      panel.setLayout(new BorderLayout()); 
      iconLabel = new JLabel(icon); 
      panel.add(iconLabel); 

      setViewportView(panel); 

      originalSize.width = icon.getIconWidth(); 
      originalSize.height = icon.getIconHeight(); 
     } 

     public void update() { 

      int min = slider.getMinimum(); 
      int max = slider.getMaximum(); 
      int span = max - min; 
      int value = slider.getValue(); 
      double multiplier = (double) value/span; 
      multiplier = multiplier == 0.0 ? 0.01 : multiplier; 
      Image scaled = originalImage.getScaledInstance((int) (originalSize.width * multiplier), (int) (originalSize.height * multiplier), Image.SCALE_FAST); 
      iconLabel.setIcon(new ImageIcon(scaled)); 
     } 
    } 

    ImageView imageView; 

    public ImageViewer(String imgFile, final ArrayList<photoNode> list) { 

     frame.addWindowListener(new WindowAdapter() { 

      public void windowClosing(WindowEvent e) { 

       frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
      } 
     }); 

     createAndShowGUI(); 

     imageFile = imgFile; 

     ImageIcon icon = new ImageIcon(imageFile); 
     imageView = new ImageView(icon); 

     JPanel panel = new JPanel(); 
     panel.add(new JLabel("Set Image Size: ")); 
     panel.add(slider); 
     panel.add(percent); 

     pane.add(panel, BorderLayout.NORTH); 
     imgViewPanel.add(imageView); 
     pane.add(imgViewPanel, BorderLayout.CENTER); 

     slider.addChangeListener(new ChangeListener() { 

      public void stateChanged(ChangeEvent e) { 
       if (!slider.getValueIsAdjusting()) { 
        percent.setText(slider.getValue() + "%"); 
        imageView.update(); 
       } 
      } 
     }); 

     JButton next = new JButton("Next"); 
     JButton prev = new JButton("Prev"); 
     pane.add(next, BorderLayout.EAST); 
     pane.add(prev, BorderLayout.WEST); 

     next.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 

       imgViewPanel.remove(imageView); 

       if (list.size() > 0) { 

        for (int i = 0; i < list.size(); i++) { 

         if (list.get(i).fileName.equalsIgnoreCase(imageFile)) {       

          if (i + 1 < list.size()) { 

           //frame.dispose(); 

           ImageIcon icon = new ImageIcon(list.get(i + 1).fileName); 
           ImageView imageView = new ImageView(icon); 

           imgViewPanel.add(imageView); 
           pane.add(imgViewPanel, BorderLayout.CENTER); 

           imgViewPanel.revalidate(); 

           break; 

          }   

         }      
        }     
       } 

      } 

     }); 


    } 

    private void createAndShowGUI() { // Creating the GUI... 

     frame.getContentPane().setBackground(Color.WHITE); 

     frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); 
     frame.setTitle("PhotoAlbum55"); 

     frame.pack(); 
     frame.setSize(400, 300); 
     frame.setLocationRelativeTo(null); 
     frame.setResizable(true); 
     frame.setVisible(true); 

    } 

} 

Answer 1

交換圖像的最簡單方法是將它們顯示爲在JLabel ImageIcons和簡單地調用setIcon(...)上的JLabel傳入另一個ImageIcon的。如果圖像足夠小，則可以創建一組圖標（可能是List<Icon>），然後在下一個或上一個按鈕按下時通過列表向後或向前移動。