直到将JButton悬停在面板上，它才会加载到面板上吗? [英] JButtons don't load on panel until hovered over?
问题描述
将其放置在框架上时，直到将鼠标悬停在按钮上之后，按钮才加载，然后它们按原样应保持起来.这是代码: 我已经调用了诸如repaint()和revalidate()之类的东西，但是它们似乎都没有解决问题. main和Frame是与StartPanel不同的类.谢谢！
When this is put on a frame, the buttons don't load until they are hovered over with the mouse, and then they stay up like they should. Here's the code: I've calling things like repaint() and revalidate() but none of them seem to have fixed the problem. The main and the Frame are seperate classes from the StartPanel. Thanks!
JButton[][] levels = new JButton[3][8];
public StartPanel(){
setSize(1600, 1000);
setLayout(null);
int count = 1;
int yValue = 150;
for(int r = 0; r < 3; r++){
for(int c = 0; c < 8; c++){
levels[r][c] = new JButton(String.valueOf(count));
levels[r][c].setLocation(c*190 + 80, yValue);
levels[r][c].setSize(100, 100);
this.add(levels[r][c]);
count++;
}
yValue += 200;
}
}
public static void main(String[] args) {
Frame f = new Frame();
StartPanel sp = new StartPanel();
f.add(sp);
f.setVisible(true);
}
public Frame() {
setSize(1600, 1000);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
setResizable(false);
}
推荐答案
避免使用null布局，像素完美布局是现代ui设计中的一种幻觉.有太多因素会影响组件的单个大小，您无法控制. Swing旨在与布局管理者为核心一起工作，舍弃这些问题不会导致任何问题，而您将花费越来越多的时间进行纠正
Avoid using null layouts, pixel perfect layouts are an illusion within modern ui design. There are too many factors which affect the individual size of components, none of which you can control. Swing was designed to work with layout managers at the core, discarding these will lead to no end of issues and problems that you will spend more and more time trying to rectify
我可能建议尝试将GridLayout与EmptyBorder之类的东西结合使用，例如，您应该能够接近想要的东西.
I might suggest trying GridLayout, in combination with something like an EmptyBorder, you should be able to get close to what you want, for example...
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
JButton[][] levels = new JButton[3][8];
public TestPane() {
setBorder(new EmptyBorder(40, 40, 40, 40));
setSize(1600, 1000);
setLayout(new GridLayout(0, 8, 40, 40));
int count = 1;
int yValue = 150;
for (int r = 0; r < 3; r++) {
for (int c = 0; c < 8; c++) {
levels[r][c] = new JButton(String.valueOf(count));
levels[r][c].setMargin(new Insets(50, 50, 50, 50));
this.add(levels[r][c]);
count++;
}
yValue += 200;
}
}
}
}
有关更多详细信息，请参见如何使用GridLayout
See How to Use GridLayout for more details
另一种解决方案可能是使用GridBagLayout，例如，它更灵活但也更复杂.
Another solution might be to use a GridBagLayout, which is more flexible, but also more complicated, for example...
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
JButton[][] levels = new JButton[3][8];
public TestPane() {
setSize(1600, 1000);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(25, 25, 25, 25);
gbc.fill = GridBagConstraints.BOTH;
int count = 1;
for (int r = 0; r < 3; r++) {
gbc.gridx = 0;
for (int c = 0; c < 8; c++) {
levels[r][c] = new JButton(String.valueOf(count));
levels[r][c].setMargin(new Insets(50, 50, 50, 50));
this.add(levels[r][c], gbc);
gbc.gridx++;
count++;
}
gbc.gridy++;
}
}
}
}
有关更多详细信息，请参见如何使用GridBagLayout
See How to Use GridBagLayout for more details
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