调整JLabel大小以适应调整大小的主要JPanel。

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英文:

Resize JLabel to fit resized main JPanel

问题

以下是代码中需要翻译的部分：

  • I have two child panels and one parent panel (background). My goal is to resize JLabel icon in firstPanel, when main panel is resized. I tried to use StretchIcon, but it works only when adding JLabel icon to main.

  • My code now:

import darrylbu.icon.StretchIcon;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;

public class Task {
    JFrame frame;
    JPanel main;

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

    public Task() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setPreferredSize(new Dimension(600, 400));
        main = mainPanel();
        frame.add(main);
        main.add(firstPanel());
        main.add(secondPanel());
        frame.pack();
        frame.setVisible(true);
    }

    private JPanel mainPanel(){
        JPanel main_panel = new JPanel() {
            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                BufferedImage background = null;
                try {
                    background  = ImageIO.read(new URL("https://jpegshare.net/images/17/b0/17b0bad019ea5e37c84a5147a33b0ce7.jpg"));
                } catch (IOException e) {
                    e.printStackTrace();
                }
                g.drawImage(background, 0, 0, this.getWidth(), this.getHeight(), this);
            }
        };
        main_panel.setLayout(new OverlayLayout(main_panel));
        main_panel.setLayout(new GridLayout(1, 2));
        return main_panel;
    }

    private JPanel firstPanel() {
        JPanel first_panel = new JPanel();
        first_panel.setOpaque(false);
        BufferedImage image = null;
        try {
            image = ImageIO.read(new URL("https://jpegshare.net/images/7a/f3/7af3bfc51cb1170be9f5655d643147d7.png"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        StretchIcon img = new StretchIcon(image);
        JLabel icon = new JLabel(img);
        first_panel.add(icon);
        first_panel.setLayout(getLayout());
        return first_panel;
    }

    private JPanel secondPanel(){
        JPanel second_panel = new JPanel() {
            @Override
            public Dimension getMaximumSize() {
                return new Dimension(300, 400);
            }
            @Override
            public void paintComponent(Graphics g) {
                BufferedImage image = null;
                try {
                    image = ImageIO.read(new URL("https://jpegshare.net/images/17/bc/17bc21f519133ca31f857a65c897925a.jpg"));
                } catch (IOException e) {
                    e.printStackTrace();
                }
                g.drawImage(image, 0, 0,
                        getWidth() / 2, getHeight() / 2, this);
            }
        };
        second_panel.setLayout(new BoxLayout(second_panel, BoxLayout.Y_AXIS));

        String [] resources = {"flowers", "nyanko", "tutturu~"};
        for(String s : resources){
            JLabel label = new JLabel(0 + " " + s);
            label.setFont(new Font("Serif", Font.BOLD, 18));
            second_panel.add(label);
        }

        return second_panel;
    }

    private GridBagLayout getLayout() {
        GridBagLayout gridBagLayout = new GridBagLayout();
        gridBagLayout.rowHeights = new int[]{0, 0, 0, 0};
        gridBagLayout.rowWeights = new double[]{0.0, 0.0, 1.0, 1.0};
        gridBagLayout.columnWidths = new int[]{0, 0, 0, 0};
        gridBagLayout.columnWeights = new double[]{0.0, 0.0, 1.0, 1.0};
        return gridBagLayout;
    }
}
英文:

I have two child panels and one parent panel (background). My goal is to resize JLabel icon in firstPanel, when main panel is resized. I tried to use StretchIcon, but it works only when adding JLabel icon to main.
My code now:

    import darrylbu.icon.StretchIcon;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
public class Task {
JFrame frame;
JPanel main;
public static void main(String args[]) {
new Task();
}
public Task() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(600, 400));
main = mainPanel();
frame.add(main);
main.add(firstPanel());
main.add(secondPanel());
frame.pack();
frame.setVisible(true);
}
private JPanel mainPanel(){
JPanel main_panel = new JPanel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage background = null;
try {
background  = ImageIO.read(new URL("https://jpegshare.net/images/17/b0/17b0bad019ea5e37c84a5147a33b0ce7.jpg"));
} catch (IOException e) {
e.printStackTrace();
}
g.drawImage(background, 0, 0, this.getWidth(), this.getHeight(), this);
}
};
main_panel.setLayout(new OverlayLayout(main_panel));
main_panel.setLayout(new GridLayout(1, 2));
return main_panel;
}
private JPanel firstPanel() {
JPanel first_panel = new JPanel();
first_panel.setOpaque(false);
BufferedImage image = null;
try {
image = ImageIO.read(new URL("https://jpegshare.net/images/7a/f3/7af3bfc51cb1170be9f5655d643147d7.png"));
} catch (IOException e) {
e.printStackTrace();
}
StretchIcon img = new StretchIcon(image);
JLabel icon = new JLabel(img);
first_panel.add(icon);
first_panel.setLayout(getLayout());
return first_panel;
}
private JPanel secondPanel(){
JPanel second_panel = new JPanel() {
@Override
public Dimension getMaximumSize() {
return new Dimension(300, 400);
}
@Override
public void paintComponent(Graphics g) {
BufferedImage image = null;
try {
image = ImageIO.read(new URL("https://jpegshare.net/images/17/bc/17bc21f519133ca31f857a65c897925a.jpg"));
} catch (IOException e) {
e.printStackTrace();
}
g.drawImage(image, 0, 0,
getWidth() / 2, getHeight() / 2, this);
}
};
second_panel.setLayout(new BoxLayout(second_panel, BoxLayout.Y_AXIS));
String [] resources = {"flowers", "nyanko", "tutturu~"};
for(String s : resources){
JLabel label = new JLabel(0 + " " + s);
label.setFont(new Font("Serif", Font.BOLD, 18));
second_panel.add(label);
}
return second_panel;
}
private GridBagLayout getLayout() {
GridBagLayout gridBagLayout = new GridBagLayout();
gridBagLayout.rowHeights = new int[]{0, 0, 0, 0};
gridBagLayout.rowWeights = new double[]{0.0, 0.0, 1.0, 1.0};
gridBagLayout.columnWidths = new int[]{0, 0, 0, 0};
gridBagLayout.columnWeights = new double[]{0.0, 0.0, 1.0, 1.0};
return gridBagLayout;
}
}

答案1

得分: 0

以下是翻译好的代码部分：

private Dimension main_size = null; // 主面板的初始尺寸
main.addComponentListener(new ComponentAdapter() {
    @Override
    public void componentResized(ComponentEvent e) {
        // 每次主面板调整大小时调用此方法
        if ((main_size == null) ||
                (main_size.width == 0 && main_size.height == 0)) {
            main_size = main.getSize();
        }
        updateJLabelSize(icon, e.getComponent().getSize());
    }
});

// 用于更新 JLabel 尺寸的方法
private void updateJLabelSize(JLabel icon, Dimension newSize) {
    int heightDifference = newSize.height - main_size.height;
    int widthDifference = newSize.width - main_size.width;
    icon.setSize(new Dimension(icon.getWidth() + widthDifference,
            icon.getHeight() + heightDifference));
    main_size = newSize;
}
英文:

You can solve this with one resize listener attached to main panel. I assume that you want to resize JLabel exactly how much you resized your main panel. Here is how you can achieve that:


private Dimension main_size = null; //Inital Dimension of main JPanel
main.addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
//This method is called everytime main panel is resized
if((main_size==null) ||
(main_size.width==0 && main_size.height==0)) {
main_size=main.getSize();
}
updateJLabelSize(icon,e.getComponent().getSize());
}
});	      

//Method for updating JLabel size
private void updateJLabelSize(JLabel icon,Dimension newSize) {
int heightDifference = newSize.height - main_size.height;
int widthDifference = newSize.width - main_size.width;
icon.setSize(new Dimension(icon.getWidth() + widthDifference, 
icon.getHeight()+heightDifference));
main_size = newSize;
}

huangapple
  • 本文由 发表于 2020年8月11日 01:47:04
  • 转载请务必保留本文链接：https://go.coder-hub.com/63345396.html
  • awt
  • imageicon
  • java
  • jlabel
  • swing
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