Question

如何通过单击按钮更新JFrame的内容。我正在构建一个图像查看器，其中将传入一个photopath列表，用户必须单击下一个或上一个按钮才能来回查看图像。如何更改图像和更新Jframe以下是我当前的实现。我试图处理当前的框架并制作一个新框架，但这不是我想要的...... 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

交换图像的最简单方法是在JLabel中将它们显示为ImageIcons，只需在JLabel上调用setIcon(...)传入另一个ImageIcon。如果图像足够小，您可以创建一组图标，可能是List<Icon>，然后在下一个或上一个按下按钮时向后或向前移动。

更新JFrame内容

1 个答案: