Java Utililty Methods JTextComponent Caret

List of utility methods to do JTextComponent Caret

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Description

The list of methods to do JTextComponent Caret are organized into topic(s).

Method

intgetCaretCol(int idx, JTextComponent comp)
Method getCaretCol. 
return Math.abs(Utilities.getRowStart(comp, idx) - idx);
intgetCaretRow(int idx, JTextComponent comp)
Method getCaretRow. 
return getLineOfOffset(idx, comp.getDocument());
intgetLineAtCaret(final JTextComponent component)
get Line At Caret 
final int caretPosition = component.getCaretPosition();
final Element root = component.getDocument().getDefaultRootElement();
return root.getElementIndex(caretPosition) + 1;
FocusListenermakeCaretAlwaysVisible(final JTextComponent comp)
Make caret visible even when the JTextComponent is not editable. 
FocusListener listener = new FocusAdapter() {
    @Override
    public void focusGained(FocusEvent e) {
        Caret caret = comp.getCaret();
        caret.setVisible(true);
        caret.setSelectionVisible(true);
};
...
voidselectLineAtCaret(JTextComponent editor)
select Line At Caret 
int lineStart = getLineStart(editor.getText(), editor.getCaretPosition());
int lineEnd = getLineEnd(editor.getText(), editor.getCaretPosition());
if (lineEnd < editor.getText().length()) {
    lineEnd++;
editor.getCaret().setDot(lineEnd);
editor.getCaret().moveDot(lineStart);
voidsetCaretUpdateEnabled(JTextComponent comp, boolean updateEnabled)
set Caret Update Enabled 
Caret caret = comp.getCaret();
if (caret instanceof DefaultCaret) {
    ((DefaultCaret) caret)
            .setUpdatePolicy(updateEnabled ? DefaultCaret.UPDATE_WHEN_ON_EDT : DefaultCaret.NEVER_UPDATE);
voidsetTextAndResetCaret(JTextComponent component, String text)
set Text And Reset Caret 
component.setText(text);
component.setCaretPosition(0);