关于Java：如何根据JButton的大小自动增加或减少JButton文本的大小？

How to automatically increase or decease size of JButton text based on the size of JButton?

我正在尝试自动增加/减小JButton文本的字体大小(如果JButton增加/伸展，其文本也会增加，如果JButton减少，其文本也会减少)。 JButton的默认字体将为Sans-Serif大小20，并且永远不会减小到20以下(它可以是21、30、40或大于或等于20的任何值，但不能小于20的任何东西)。我有一个名为MenuJPanel的JPanel，它使用GridLayout添加5个JButton，这些JButton的大小将随着JPanel的增加/减少而增加/减小。我选择了GridLayout，因为它似乎是用于此目的的最佳布局，对吗？我还向MenuJPanel添加了componentResized。在下面，您可以看到部分起作用的代码。

enter

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

public class MenuJPanel extends JPanel {

private JButton resizeBtn1;
private JButton resizeBtn2;
private JButton resizeBtn3;
private JButton resizeBtn4;
private JButton resizeBtn5;

public MenuJPanel() {
initComponents();
this.addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {

Font btnFont = resizeBtn1.getFont();
String btnText = resizeBtn1.getText();

int stringWidth = resizeBtn1.getFontMetrics(btnFont).stringWidth(btnText);
int componentWidth = resizeBtn1.getWidth();

// Find out how much the font can grow in width.
double widthRatio = (double) componentWidth / (double) stringWidth;

int newFontSize = (int) (btnFont.getSize() * widthRatio);
int componentHeight = resizeBtn1.getHeight();

// Pick a new font size so it will not be larger than the height of label.
int fontSizeToUse = Math.min(newFontSize, componentHeight);

// Set the label's font size to the newly determined size.
resizeBtn1.setFont(new Font(btnFont.getName(), Font.BOLD, fontSizeToUse));
}
});
}

private void initComponents() {

resizeBtn1 = new javax.swing.JButton();
resizeBtn2 = new javax.swing.JButton();
resizeBtn3 = new javax.swing.JButton();
resizeBtn4 = new javax.swing.JButton();
resizeBtn5 = new javax.swing.JButton();

setLayout(new java.awt.GridLayout(5, 0));

resizeBtn1.setText("Text to resize 1");
add(resizeBtn1);

resizeBtn2.setText("Text to resize 2");
add(resizeBtn2);

resizeBtn3.setText("Text to resize 3");
add(resizeBtn3);

resizeBtn4.setText("Text to resize 4");
add(resizeBtn4);

resizeBtn5.setText("Text to resize 5");
add(resizeBtn5);
}
}