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

voidcurrentLineChanged(final JTextComponent c)
Fetches the previous caret location, stores the current caret location. 
if (null == c.getClientProperty(PREVIOUS_CARET)) {
    return;
try {
    final int previousCaret = ((Integer) c.getClientProperty(PREVIOUS_CARET)).intValue();
    final Rectangle prev = c.modelToView(previousCaret);
    final Rectangle r = c.modelToView(c.getCaretPosition());
    c.putClientProperty(PREVIOUS_CARET, new Integer(c.getCaretPosition()));
...
voidenableJTextField(JTextComponent component, boolean enable, Color color)
enable J Text Field 
component.setEnabled(enable);
component.setEditable(enable);
component.setBackground(color);
component.invalidate();
component.validate();
component.repaint(1);
voidensureCustomBackgroundStored(JTextComponent comp)
Ensures that a text component's custom background - if any - is stored as a client property. 
if (getStoredBackground(comp) != null)
    return;
Color background = comp.getBackground();
if ((background == null) || (background instanceof UIResource) || (background == WARNING_BACKGROUND)
        || (background == ERROR_BACKGROUND))
    return;
comp.putClientProperty(STORED_BACKGROUND_KEY, background);
voidensureCustomBackgroundStored(JTextComponent comp)
Ensures that a text component's custom background - if any - is stored as a client property. 
if (getStoredBackground(comp) != null)
    return;
Color background = comp.getBackground();
if ((background == null) || (background instanceof UIResource) || (background == WARNING_BACKGROUND)
        || (background == ERROR_BACKGROUND))
    return;
comp.putClientProperty(STORED_BACKGROUND_KEY, background);
voidfillWith(String value, JTextComponent... fields)
fill With 
for (JTextComponent field : fields) {
    field.setText(value);
intgetAdjustedClickCount(JTextComponent comp, MouseEvent e)
Return the MouseEvent's click count, possibly reduced by the value of the component's SKIP_CLICK_COUNT client property. 
int cc = e.getClickCount();
if (cc == 1) {
    comp.putClientProperty(SKIP_CLICK_COUNT, null);
} else {
    Integer sub = (Integer) comp.getClientProperty(SKIP_CLICK_COUNT);
    if (sub != null) {
        return cc - sub;
return cc;
StringgetCurrentTextBlock(JTextComponent textComponent)
this method will get the current block of text that the caret is within. 
String patternStr = "(?m)^\\s*?$";
Pattern pattern = Pattern.compile(patternStr);
String text = textComponent.getText();
Matcher matcher = pattern.matcher(text);
int caretPosition = textComponent.getCaretPosition();
int prevBlankLineIndex = 0;
while (matcher.find()) {
    if (matcher.start() >= caretPosition)
...
intgetNumberOfLines(final JTextComponent component)
get Number Of Lines 
final Element root = component.getDocument().getDefaultRootElement();
return root.getElementCount();
ElementgetParagraphElement(JTextComponent c, int offs)
Determines the element to use for a paragraph/line. 
Document doc = c.getDocument();
if (doc instanceof StyledDocument) {
    return ((StyledDocument) doc).getParagraphElement(offs);
Element map = doc.getDefaultRootElement();
int index = map.getElementIndex(offs);
Element paragraph = map.getElement(index);
if ((offs >= paragraph.getStartOffset()) && (offs < paragraph.getEndOffset())) {
...
intgetPositionBelow(JTextComponent c, int offs, int x)
Determines the position in the model that is closest to the given view location in the row below. 
int lastOffs = getRowEnd(c, offs) + 1;
if (lastOffs <= 0) {
    return -1;
int bestSpan = Short.MAX_VALUE;
int n = c.getDocument().getLength();
int y = 0;
Rectangle r = null;
...