matthiasblaesing commented on pull request #2482:
URL: https://github.com/apache/netbeans/pull/2482#issuecomment-721061353
@errael what is wrong with the "draw till next character" approach? The API
addition be it necessary or not, will not fix the existing users. This is the
code I used to see what Swing reports for `modelToView`:
```java
public class JTextComponentWidth {
public static void main(String[] args) throws BadLocationException {
JFrame jframe = new JFrame("Test");
jframe.setSize(1024, 768);
jframe.setLayout(new BorderLayout());
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea textArea = new JTextArea();
textArea.setCaret(new DefaultCaret() {
});
Document doc = textArea.getDocument();
doc.remove(0, doc.getLength());
for (char i = 1; i < 128; i++) {
doc.insertString(doc.getLength(), Character.toString(i), null);
}
jframe.add(new JScrollPane(textArea));
jframe.setVisible(true);
SwingUtilities.invokeLater(() -> {
for (char i = 0; i <= doc.getLength(); i++) {
try {
Rectangle r1 = textArea.modelToView(i);
Rectangle r2 = textArea.modelToView(i + 1);
System.out.println(((int) i + 1) + ": " + r1 + " " + (r2.x
- r1.x));
} catch (BadLocationException ex) {
Logger.getLogger(JTextComponentWidth.class.getName()).log(Level.SEVERE, null,
ex);
}
}
});
SwingUtilities.invokeLater(() -> {
try {
System.out.println(doc.getLength());
System.out.println(textArea.modelToView(doc.getLength() - 1));
System.out.println(textArea.modelToView(doc.getLength()));
System.out.println(textArea.modelToView(doc.getLength() + 1));
} catch (BadLocationException ex) {
Logger.getLogger(JTextComponentWidth.class.getName()).log(Level.SEVERE, null,
ex);
}
});
}
}
```
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