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How to Display HTML Text using drawString in Swing?

Linda Hamilton

Nov 14, 2024 pm 08:03 PM

How to Display HTML Text using drawString in Swing?

Swing HTML Issue with drawString: Rendering HTML Format

Question:

In an attempt to draw HTML text within a custom component using the drawString method of the Graphics class, the HTML format remains unrecognized. Instead, the string is displayed without any special treatment.

Answer:

While the drawString method is commonly used for drawing plain strings, it does not inherently support HTML formatting. To effectively render HTML content in Swing components, an alternative approach is recommended:

Using a Component for HTML Rendering:

The preferred solution involves creating a custom component that serves the specific purpose of HTML rendering. This allows for greater control over how the HTML is interpreted and displayed within the component.

For instance, the code snippet below outlines a simplified implementation that displays HTML text within a JPanel using a renderer component:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.CellRendererPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
 
public class HtmlRenderer extends JPanel {
 
    private static final String HTML_STRING = "<html><b><i>Hello World!</i></b></html>";
    private JLabel renderer = new JLabel(HTML_STRING);
    private CellRendererPane crp = new CellRendererPane();
    private Dimension dim;
 
    public HtmlRenderer() {
        dim = renderer.getPreferredSize();
        this.add(crp);
    }
 
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        renderer.setForeground(Color.BLUE);
        crp.paintComponent(g, renderer, this, 0, 0, dim.width, dim.height);
    }
 
    private void display() {
        JFrame frame = new JFrame("HTML Renderer");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(this);
        frame.pack();
        frame.setSize(dim.width + 20, dim.height + 20);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
 
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                HtmlRenderer renderer = new HtmlRenderer();
                renderer.display();
            }
        });
    }
}

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