Java AttributedString，粗体和上标 [英] Java AttributedString, both bold and superscript
问题描述
我正在尝试渲染一个 java.text.AttributedString ，它是粗体和上标。虽然它可以使某些范围为粗体或上标，但渲染似乎无法处理粗体和上标范围。
I am trying to render a java.text.AttributedString which is both bold and superscript. While it works to make some range either bold or superscripted, the rendering can't seem to handle a range that is both bold and superscript.
以下SSCCE显示渲染这使用带有HTML文本的JLabel工作正常。有没有办法在没有JLabel的情况下获得这种行为？
The following SSCCE shows that rendering this using a JLabel with HTML text works fine. Is there a way to get this behaviour without a JLabel?
顺便说一下，我查看了创建的AttributedString属性，它们看起来没问题，所以它最终是一个渲染问题。
Btw, I had a look into the created AttributedString properties and they look okay by me, so it is definitively a rendering problem.
package funky.chart;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.font.TextAttribute;
import java.text.AttributedString;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
public class AttributedStringTest
{
public static void main(String[] args) {
// prevent using the default UI manager who renders in bold by default for the HTML label
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
System.err.println("Could not set look and feel: " + ex);
}
JFrame frame = new JFrame("AttributedString superscript with font");
frame.getContentPane().add(new JPanel() {
@Override
public void paint(Graphics gfx) {
super.paint(gfx);
Font bold = gfx.getFont().deriveFont(Font.BOLD);
// superscript and bold only works fine
AttributedString test1 = new AttributedString("test superscript and bold");
test1.addAttribute(TextAttribute.SUPERSCRIPT, TextAttribute.SUPERSCRIPT_SUPER, 5, 16);
test1.addAttribute(TextAttribute.FONT, bold, 21, 25);
// both superscript and bold is only rendered as bold
AttributedString test2 = new AttributedString("test superscript and bold");
test2.addAttribute(TextAttribute.SUPERSCRIPT, TextAttribute.SUPERSCRIPT_SUPER, 5, 25);
test2.addAttribute(TextAttribute.FONT, bold, 5, 25);
gfx.drawString(test1.getIterator(), 5, 20);
gfx.drawString(test2.getIterator(), 5, 40);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 70);
}
});
// HTML label works fine
frame.getContentPane().add(
new JLabel("<html>test <b>bold</b>, <sup>super</sup> and <b><sup>both</sup></b>"),
BorderLayout.SOUTH);
frame.pack();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setVisible(true);
}
}
推荐答案
一些完整示例说明：
-
使用
TextAttribute.WEIGHT指定粗体。
使用 TextAttribute.SIZE 指定字体大小。
Use TextAttribute.SIZE to specify font size.
使用 TextLayout 计算首选大小，如此处所示。
应该在仅的Swing GUI对象/tutorial/uiswing/concurrency/initial.htmlrel =nofollow也没有eferrer>事件发送线程。
Swing GUI objects should be constructed and manipulated only on the event dispatch thread.
Swing程序应覆盖 paintComponent（）而不是覆盖 paint（）。 - 在AWT和Swing中绘画：绘画方法 。
"Swing programs should override paintComponent() instead of overriding paint()."—Painting in AWT and Swing: The Paint Methods.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.font.TextAttribute;
import java.text.AttributedString;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/** @see https://stackoverflow.com/a/31360762/230513 */
public class AttributedStringTest {
public static void main(String[] args) {
EventQueue.invokeLater(new AttributedStringTest()::display);
}
private void display() {
JFrame frame = new JFrame("AttributedString superscript with font");
frame.getContentPane().add(new JPanel() {
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
// superscript and bold only works fine
AttributedString test1 = new AttributedString("test superscript and bold");
test1.addAttribute(TextAttribute.SIZE, 28, 0, 25);
test1.addAttribute(TextAttribute.SUPERSCRIPT, TextAttribute.SUPERSCRIPT_SUPER, 5, 16);
test1.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD, 21, 25);
// both superscript and bold is only rendered as bold
AttributedString test2 = new AttributedString("test superscript and bold");
test2.addAttribute(TextAttribute.SIZE, 28, 0, 25);
test2.addAttribute(TextAttribute.SUPERSCRIPT, TextAttribute.SUPERSCRIPT_SUPER, 5, 25);
test2.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD, 5, 25);
g.drawString(test1.getIterator(), 5, 35);
g.drawString(test2.getIterator(), 5, 70);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 80);
}
});
// HTML label works fine
frame.getContentPane().add(new JLabel(
"<html>test <b>bold</b>, <sup>super</sup> and <b><sup>both</sup></b>", JLabel .CENTER),
BorderLayout.SOUTH);
frame.pack();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setVisible(true);
}
}
这篇关于Java AttributedString，粗体和上标的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
