当我调整GUI大小时，我在尝试调整GUI中的组件时遇到了一些麻烦。现在，当我调整GUI的大小时，组件的大小不会改变，它们会保持我设置的静态大小。当我调整GUI大小时，通过显示它们所需的最小大小，它们将不再显示。我希望它们在调整GUI大小时调整大小并保持宽高比。
以下是我对GUI的代码：
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.io.*;
import java.net.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.text.*;
import javax.swing.text.html.*;
public class DraftGUI implements MouseListener {
private JPanel jpPack;
private JPanel jpCards;
private JPanel jpInfo;
private JPanel jpChat;
private TextField tf;
private StyledDocument doc;
private JTextPane tp;
private JScrollPane sp;
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mouseClicked(MouseEvent e) {
e.getComponent().setVisible(false);
}
private Client client;
public GUI(Client client) throws IOException {
JFrame frame = new JFrame("Draft");
//set the size to fullscreen to start
frame.setSize(Toolkit.getDefaultToolkit().getScreenSize().width, Toolkit.getDefaultToolkit().getScreenSize().height);
//set the content pane, we'll add everything to it and then add it to the frame
JPanel contentPane = new JPanel();
contentPane.setSize(Toolkit.getDefaultToolkit().getScreenSize().width, Toolkit.getDefaultToolkit().getScreenSize().height);
contentPane.setLayout(new GridBagLayout());
//creates some panels with some default values for now
JPanel jpCards = new JPanel(new BorderLayout());
jpCards.setOpaque(true); //ensures it paints every pixel
jpCards.setBackground(Color.BLUE);
JPanel jpInfo = new JPanel();
jpInfo.setOpaque(true);
jpInfo.setBackground(Color.GREEN);
JPanel jpPack = new JPanel(new GridBagLayout());
jpPack.setOpaque(true);
jpPack.setBackground(Color.RED);
//grab some info to make the JTextPane and make it scroll
this.client = client;
tf = new TextField();
doc = new DefaultStyledDocument();
tp = new JTextPane(doc);
tp.setEditable(false);
tf.addActionListener(this.client);
sp = new JScrollPane(tp);
//adding the quantities to the chat panel
JPanel jpChat = new JPanel();
jpChat.setLayout(new BorderLayout());
jpChat.add("North", tf);
jpChat.add("Center", sp);
//a new GridBagConstraints used to set the properties/location of the panels
GridBagConstraints c = new GridBagConstraints();
//adding some panels to the content pane
//set it to start from the top left of the quadrant if it's too small
c.anchor = GridBagConstraints.FIRST_LINE_START;
c.fill = GridBagConstraints.BOTH; //set it to fill both vertically and horizontally
c.gridx = 0; //set it to quadrant x=0 and
c.gridy = 0; //set it to quadrant y=0
c.weightx = 0.7;
c.weighty = 0.3;
contentPane.add(jpCards, c);
c.gridx = 1;
c.gridy = 0;
c.weightx = 0.3;
c.weighty = 0.3;
contentPane.add(jpInfo, c);
c.gridx = 0;
c.gridy = 1;
c.weightx = 0.7;
c.weighty = 0.7;
contentPane.add(jpPack, c);
c.gridx = 1;
c.gridy = 1;
c.weightx = 0.3;
c.weighty = 0.7;
contentPane.add(jpChat, c);
//set some necessary values
frame.setContentPane(contentPane);
frame.setLocationByPlatform(true);
frame.setVisible(true);
//This code works for adding an Image
//need to learn how to specify a path not dependent on the specific users's machine
//this is not a high priority for now though
GridBagConstraints d = new GridBagConstraints();
d.gridx = 0;
d.gridy = 0;
ImageLabel imageLabel1 = new ImageLabel("path-to-file");
imageLabel1.setPreferredSize(new Dimension(223, 310));
jpPack.add(imageLabel1, d);
ImageLabel imageLabel2 = new ImageLabel("path-to-file");
imageLabel2.setPreferredSize(new Dimension(223, 310));
ImageLabel imageLabel3 = new ImageLabel("path-to-file");
imageLabel3.setPreferredSize(new Dimension(223, 310));
d.gridx = 1;
jpPack.add(imageLabel2, d);
d.gridy = 1;
jpPack.add(imageLabel3, d);
imageLabel1.addMouseListener(this);
imageLabel2.addMouseListener(this);
imageLabel3.addMouseListener(this);
//223, 310 are the aspect values for a card image, width, height
//these need to be maintained as the GUI size changes
}
}
class ImageLabel extends JLabel {
Image image;
ImageObserver imageObserver;
// constructor with filename
ImageLabel(String filename) {
ImageIcon icon = new ImageIcon(filename);
image = icon.getImage();
imageObserver = icon.getImageObserver();
}
// constructor with icon
ImageLabel(ImageIcon icon) {
image = icon.getImage();
imageObserver = icon.getImageObserver();
}
// overload setIcon method
void setIcon(ImageIcon icon) {
image = icon.getImage();
imageObserver = icon.getImageObserver();
}
// overload paint()
public void paint( Graphics g ) {
super.paint( g );
g.drawImage(image, 0 , 0 , getWidth() , getHeight() , imageObserver);
}
}
由于某些原因，帧的组件没有默认的resizing属性，因此当帧调整大小时，组件不会执行任何操作。我不确定我做错了什么或错过了什么，但显然我遗漏了一些东西。
此外，如果有人知道，ImageLabels会占用额外的空间。填充默认设置为0，所以我不确定它为什么会像它们周围的边框那样创建。
感谢。
Guillaume的编辑：
我知道如果我想将它作为一个独立的程序运行它是必要的，它当前是另一个应用程序的一部分，并在其中单独调用。如果没有主要的完整性，发布它可能不是最好的决定，但无论如何，这不是一个大问题。
您的代码取出了实际显示图片的部分。 “path-to-file”应该被实际的图像文件路径替换，因此您将显示图像。当它只是那里的文本时，很难真正看到手头的问题。
如果图像显示正确，并且您尝试调整整个GUI的大小，您会注意到图像不会缩小。它保持其首选尺寸，并且当它变得小于它时会出现问题。在我的代码中，当它无法显示至少首选大小时，它会完全停止显示图片。在您的代码中，它会在缩小时切断部分图片。
我想要的是它实际调整包含图片的JLabel的大小，以便在GUI调整大小时，图像也会调整大小。对于我的程序，图像必须相应缩小。用户最终将具有基于单击图像的功能，因此仅显示一些图像或部分图像根本不会。
请再次尝试您的代码/我的代码并重现我遇到的问题，测试图片，以便我们找到正确的解决方案。感谢。
答案 0 :(得分：4)
JFrame.setVisible(true)应该是您拨打的最后一行。GridBagLayout可以根据框架大小调整组件的大小，只要您使用weightx/weighty和fill 更新：
anchor和/或fill frame.pack()正确调整框架尺寸setExtendedState()最大化框架顺便说一下，SSCCE表示您为其他人制作了一个可运行的示例，这包括将图像的本地路径更改为在线URL（参见下面的示例）。
使用以下代码段，一切似乎都可以正常运行：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.TextField;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.StyledDocument;
public class DraftGUI implements MouseListener {
private static final String IMAGE_URL = "http://images.paramountbusinessjets.com/space/spaceshuttle.jpg";
private JPanel jpPack;
private JPanel jpCards;
private JPanel jpInfo;
private JPanel jpChat;
private TextField tf;
private StyledDocument doc;
private JTextPane tp;
private JScrollPane sp;
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseClicked(MouseEvent e) {
}
public DraftGUI() throws MalformedURLException {
final JFrame frame = new JFrame("Draft");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// set the content pane, we'll add everything to it and then add it to the frame
JPanel contentPane = new JPanel();
contentPane.setLayout(new GridBagLayout());
// creates some panels with some default values for now
JPanel jpCards = new JPanel(new BorderLayout());
jpCards.setBackground(Color.BLUE);
JPanel jpInfo = new JPanel();
jpInfo.setBackground(Color.GREEN);
JPanel jpPack = new JPanel(new GridBagLayout());
jpPack.setBackground(Color.RED);
// grab some info to make the JTextPane and make it scroll
tf = new TextField();
doc = new DefaultStyledDocument();
tp = new JTextPane(doc);
tp.setEditable(false);
sp = new JScrollPane(tp);
// adding the quantities to the chat panel
JPanel jpChat = new JPanel();
jpChat.setLayout(new BorderLayout());
jpChat.add("North", tf);
jpChat.add("Center", sp);
// a new GridBagConstraints used to set the properties/location of the panels
GridBagConstraints c = new GridBagConstraints();
// adding some panels to the content pane
// set it to start from the top left of the quadrant if it's too small
c.anchor = GridBagConstraints.FIRST_LINE_START;
c.fill = GridBagConstraints.BOTH; // set it to fill both vertically and horizontally
c.gridx = 0; // set it to quadrant x=0 and
c.gridy = 0; // set it to quadrant y=0
c.weightx = 0.7;
c.weighty = 0.3;
contentPane.add(jpCards, c);
c.gridx = 1;
c.gridy = 0;
c.weightx = 0.3;
c.weighty = 0.3;
contentPane.add(jpInfo, c);
c.gridx = 0;
c.gridy = 1;
c.weightx = 0.7;
c.weighty = 0.7;
contentPane.add(jpPack, c);
c.gridx = 1;
c.gridy = 1;
c.weightx = 0.3;
c.weighty = 0.7;
contentPane.add(jpChat, c);
// set some necessary values
frame.setContentPane(contentPane);
frame.setLocationByPlatform(true);
// This code works for adding an Image
// need to learn how to specify a path not dependent on the specific users's machine
// this is not a high priority for now though
GridBagConstraints d = new GridBagConstraints();
d.weightx = 1.0;
d.weighty = 1.0;
d.fill = GridBagConstraints.BOTH;
d.gridx = 0;
d.gridy = 0;
ImageLabel imageLabel1 = new ImageLabel(new ImageIcon(new URL(IMAGE_URL)));
jpPack.add(imageLabel1, d);
ImageLabel imageLabel2 = new ImageLabel(new ImageIcon(new URL(IMAGE_URL)));
d.gridx++;
jpPack.add(imageLabel2, d);
ImageLabel imageLabel3 = new ImageLabel(new ImageIcon(new URL(IMAGE_URL)));
d.gridy++;
jpPack.add(imageLabel3, d);
imageLabel1.addMouseListener(this);
imageLabel2.addMouseListener(this);
imageLabel3.addMouseListener(this);
frame.pack();
// 223, 310 are the aspect values for a card image, width, height
// these need to be maintained as the GUI size changes
frame.setExtendedState(frame.getExtendedState() | JFrame.MAXIMIZED_BOTH);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
new DraftGUI();
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
});
}
public static class ImageLabel extends JPanel {
private static int counter = 1;
private ImageIcon icon;
private int id = counter++;
public ImageLabel(ImageIcon icon) {
super();
setOpaque(false);
this.icon = icon;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(icon.getIconWidth(), icon.getIconHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
double zoom = Math.min((double) getWidth() / icon.getIconWidth(), (double) getHeight() / icon.getIconHeight());
int width = (int) (zoom * icon.getIconWidth());
int height = (int) (zoom * icon.getIconHeight());
g.drawImage(icon.getImage(), (getWidth() - width) / 2, (getHeight() - height) / 2, width, height, this);
g.setFont(g.getFont().deriveFont(36.0f));
g.drawString(String.valueOf(id), getWidth() / 2, getHeight() / 2);
}
}
}