Java Utililty Methods JTextComponent

List of utility methods to do JTextComponent

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Description

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

Method

voidreadOnly(JTextComponent c, Component parent)
read Only 
c.setEditable(false);
c.setForeground(parent.getForeground());
c.setBackground(parent.getBackground());
voidrefreshJTextComponent(JTextComponent textComponent)
refresh J Text Component 
int pos = textComponent.getCaretPosition();
textComponent.setText(textComponent.getText());
textComponent.validate();
try {
    textComponent.setCaretPosition(pos);
} catch (IllegalArgumentException e) {
    System.err.println(e.getMessage());
voidregisterEvents(final JTextComponent textCmp, final String hintText)
register Events 
textCmp.addFocusListener(new FocusListener() {
    public void focusGained(FocusEvent e) {
        if (textCmp.getText().equals(hintText)) {
            textCmp.setText("");
    public void focusLost(FocusEvent e) {
});
voidregisterUpperCase(final JTextComponent textComp)
register Upper Case 
textComp.addKeyListener(new KeyAdapter() {
    @Override
    public void keyReleased(KeyEvent e) {
        textComp.setText(textComp.getText().toUpperCase());
});
voidremoveAllHighlightsUsingPainter(final JTextComponent textComponent, final Highlighter.HighlightPainter painter)
remove All Highlights Using Painter 
Highlighter highlighter = textComponent.getHighlighter();
for (Highlighter.Highlight highlight : highlighter.getHighlights()) {
    if (highlight.getPainter() == painter) {
        highlighter.removeHighlight(highlight);
voidremoveDocumentListeners(JTextComponent component)
Remove all document listeners from this text component 
Document document = component.getDocument();
if (document instanceof AbstractDocument) {
    DocumentListener[] dls = ((AbstractDocument) document).getDocumentListeners();
    for (int i = 0; i < dls.length; i++) {
        ((AbstractDocument) document).removeDocumentListener(dls[i]);
    UndoableEditListener[] uels = ((AbstractDocument) document).getUndoableEditListeners();
    for (int i = 0; i < uels.length; i++) {
...
StringsafeGetText(JTextComponent textComponent)
Gets the "text" contents of a JTextComponent without the possibility of a NullPointerException . 
String value = "";
if ((textComponent != null) && (textComponent.getText() != null)) {
    value = textComponent.getText();
return value;
voidscrollToText(JTextComponent textComponent, int startingIndex, int endingIndex)
Scrolls the specified text component so the text between the starting and ending index are visible. 
try {
    Rectangle startingRectangle = textComponent.modelToView(startingIndex);
    Rectangle endDingRectangle = textComponent.modelToView(endingIndex);
    Rectangle totalBounds = startingRectangle.union(endDingRectangle);
    textComponent.scrollRectToVisible(totalBounds);
    textComponent.repaint();
} catch (BadLocationException e) {
    e.printStackTrace();
...
voidscrollToTop(JTextComponent edit1)
scroll To Top 
edit1.setCaretPosition(0);
voidsetError(JTextComponent component, boolean error)
set Error 
component.setBackground(error ? ERROR_BG : NORMAL_BG);