[英]Resizing JFrame to fit resized JPanel
I am pretty new with JPanel and JFrame and probably not working with them the way I should. 我对JPanel和JFrame很陌生,可能无法按我应该的方式使用它们。 I'm trying to create Pong game and after creating JFrame and adding JPanel to it, I'm able to resize my JPanel but I don't know how to resize my JFrame to fit it.
我正在尝试创建Pong游戏,并在创建JFrame并将其添加到JPanel之后,我能够调整JPanel的大小,但是我不知道如何调整JFrame的大小以适合它。 Game class extends JPanel.
游戏类扩展了JPanel。
main: 主要:
public static void main(String[] args) throws InterruptedException {
int height = 500, width =(int) (height*1.56); //height = 500, width = 780;
JFrame frame = new JFrame("Pong");
Game game = new Game();
frame.add(game);
frame.setVisible(true);
game.setSize(width, height);
System.out.println(game.getHeight());
System.out.println(game.getWidth());
game.setBackground(Color.BLACK);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
System.out.println(frame.getHeight());
System.out.println(frame.getWidth());
}
output: 输出:
500
780
39
136
The output should be somthing like: 输出应该是这样的:
500
780
*above* 500
*above* 780
EDIT: 编辑:
public static void main(String[] args) throws InterruptedException {
int height = 500, width =(int) (height*1.56); //height = 500, width = 780;
JFrame frame = new JFrame("Pong");
Game game = new Game();
frame.add(game);
frame.setVisible(true);
game.setPreferredSize(new Dimension(width, height));
frame.pack();
System.out.println(game.getHeight());
System.out.println(game.getWidth());
game.setBackground(Color.BLACK);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
System.out.println(frame.getHeight());
System.out.println(frame.getWidth());
}
Changing the setSize to setPreferredSize and then call pack() for the JFrame fixed it all. 将setSize更改为setPreferredSize,然后为JFrame调用pack()修复了所有问题。
Again, deal with preferred sizes and make sure to call pack()
on your JFrame after adding components. 同样,处理首选大小,并确保在添加组件后在JFrame上调用
pack()
。 Also, it's better to override getPreferredSize rather than calling setPreferredSize
. 另外,最好重写getPreferredSize而不是调用
setPreferredSize
。 For example: 例如:
import java.awt.Dimension;
import javax.swing.*;
public class Game extends JPanel {
private static final int PREF_W = 400;
private static final int PREF_H = 300;
private int prefW;
private int prefH;
public Game(int prefW, int prefH) {
this.prefW = prefW;
this.prefH = prefH;
}
public Game() {
this(PREF_W, PREF_H);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(prefW, prefH);
}
private static void createAndShowGui() {
int height = 500;
int width =(int) (height*1.56); //height = 500, width = 780;
Game game = new Game(width, height);
JFrame frame = new JFrame("Game");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(game);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
System.out.println("Frame size: " + frame.getSize());
System.out.println("game size: " + game.getSize());
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
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