更改JPanel及其所有元素的字体大小 [英] Change font size of a JPanel and all its elements

问题描述

我正在尝试创建一个Swing面板，其元素的字体大小与swing应用程序的其余部分不同.最初，对两个组件使用 setFont 不会造成任何问题.现在我有几个组件(及其所有子组件)，因此此解决方案不切实际.

I am trying to create a Swing panel whose elements have a different font size than the rest of the swing application. Initially, using setFont for a couple of components didn't pose any problems. Now I have several components (and all their subcomponents), so this solution is impractical.

我搜索了有关更改挥杆组件的默认UI属性的信息.我发现的大部分是使用UIManager，它会全局更改属性.这对我不起作用，因为我想保留所有其他面板的当前字体设置.

I have searched about changing the default UI properties of swing components. What I have found is mostly using the UIManager, which changes the properties globally. This doesn't work for me because I want to keep the current font settings for all the other panels.

目前(由于我不喜欢先不尝试就发布内容)，所以我有一个像这样的算法:

For the moment (and since I don't like to post without trying something out first), I have an algorithm like this:

public static void fixFont(Container c) {
    c.setFont(c.getFont().deriveFont(10.0f));
    Component[] comp = c.getComponents();
    for (int i=0;i<comp.length;++i) {
        if (comp[i] instanceof Container) {
            fixFont((Container) comp[i]);
        } else {
            comp[i].setFont(comp[i].getFont().deriveFont(10.0f));
        }
    }
}

问题在于:

• 它不包括某些摆动元素，例如其边框.
• 动态添加其他组件时必须调用此函数

问题:还有另一种方法来更改Swing面板及其所有组件，元素等(即面板中的所有内容)的字体属性吗?

Question: Is there another way to change the font properties of a Swing panel and all its components, elements, etc (i.e. everything in the panel) ?

感谢您的想法

推荐答案

您可以使用此技巧:

import java.awt.*;

public class FrameTest {

    public static void setUIFont(FontUIResource f) {
        Enumeration keys = UIManager.getDefaults().keys();
        while (keys.hasMoreElements()) {
            Object key = keys.nextElement();
            Object value = UIManager.get(key);
            if (value instanceof FontUIResource) {
                FontUIResource orig = (FontUIResource) value;
                Font font = new Font(f.getFontName(), orig.getStyle(), f.getSize());
                UIManager.put(key, new FontUIResource(font));
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {

        setUIFont(new FontUIResource(new Font("Arial", 0, 20)));

        JFrame f = new JFrame("Demo");
        f.getContentPane().setLayout(new BorderLayout());

        JPanel p = new JPanel();
        p.add(new JLabel("hello"));
        p.setBorder(BorderFactory.createTitledBorder("Test Title"));

        f.add(p);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(300, 300);
        f.setVisible(true);
    }
}

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