java - 调整窗口大小时使用面板中设置的图标调整 JLabel 的大小

Question

我有一个关于使用设置的图标调整 JLabel 大小的问题。

我的解决方案是创建一个计时器，通过调用 ActionListener 接口(interface)的 actionperformed() 方法来调整标签的大小。

有没有更好的解决办法？

package examples;

import images.MyImage;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

public class examples2 {

    private static JFrame frame = new JFrame();
    private static JPanel panel = new JPanel(new BorderLayout());

    private static class ButtonHandler implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            Image image = resizeImage(MyImage.IMAGE_BLUE_BLACKGROUND,
                    panel.getWidth(), panel.getHeight());
            label.setIcon(new ImageIcon(image));

        }

    }

    private static ActionListener buttonhandler = new ButtonHandler();
    private static Timer timer = new Timer(100, buttonhandler);

    private static JLabel label = new JLabel(new ImageIcon(resizeImage(
            MyImage.IMAGE_BLUE_BLACKGROUND, 1600, 100)));

    public static void main(String[] args) {

        JPanel northPanel = new JPanel(new BorderLayout());
        JLabel text = new JLabel("Hakan Kiyar");

        frame.setLayout(new BorderLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(northPanel, BorderLayout.NORTH);
        frame.getContentPane().add(new JButton(), BorderLayout.CENTER);
        frame.setVisible(true);

        northPanel.add(Box.createVerticalStrut(10), BorderLayout.NORTH);
        northPanel.add(Box.createHorizontalStrut(10), BorderLayout.WEST);
        northPanel.add(Box.createHorizontalStrut(10), BorderLayout.EAST);
        northPanel.add(Box.createVerticalStrut(10), BorderLayout.SOUTH);
        northPanel.add(panel, BorderLayout.CENTER);

        text.setForeground(Color.YELLOW);

        label.setLayout(new GridBagLayout());
        label.add(text);

        panel.add(label);

        frame.setSize(364, 300);

        timer.start();

    }

    public static Image resizeImage(Image oldImage, int width, int height) {

        Image newImage = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_ARGB);

        Graphics g = newImage.getGraphics();

        g.drawImage(oldImage, 0, 0, null);
        g.dispose();

        return newImage;
    }
}

Answer 1

您可以使用 Darryl 的 Stretch Icon 动态调整图标大小类(class)。

它将调整图标大小以填充标签可用的空间。您可以配置类以拉伸(stretch)图标以填充整个空间或在空间可用时遵循宽度/高度比。