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

voidsetErrorBackground(JTextComponent comp)
Sets the text component's background to a color that shall indicate that the component's content has is invalid with error severity. 
comp.setBackground(ERROR_BACKGROUND);
voidsetMandatoryBackground(JTextComponent comp)
Sets the text component's background to a color that shall indicate that the component's content is mandatory. 
comp.setBackground(MANDATORY_BACKGROUND);
voidsetMandatoryBorder(JTextComponent comp)
Sets the text component's border to use a new border that shall indicate that the component's content is mandatory.

Note: The component foreground and border colors are managed by the look&feel implementation. 

Container parent = comp.getParent();
if (parent instanceof JViewport) {
    Container grandpa = parent.getParent();
    if (grandpa instanceof JScrollPane) {
        ((JScrollPane) grandpa).setBorder(getMandatoryBorder());
        return;
comp.setBorder(getMandatoryBorder());
voidsetMandatoryBorder(JTextComponent comp)
Sets the text component's border to use a new border that shall indicate that the component's content is mandatory. 
Container parent = comp.getParent();
if (parent instanceof JViewport) {
    Container grandpa = parent.getParent();
    if (grandpa instanceof JScrollPane) {
        ((JScrollPane) grandpa)
                .setBorder(new CompoundBorder(getMandatoryBorder(), ((JScrollPane) grandpa).getBorder()));
        return;
if (comp.getBorder() == getMandatoryBorder())
    return;
if ((comp.getBorder() instanceof CompoundBorder)
        && (((CompoundBorder) comp.getBorder()).getOutsideBorder() == getMandatoryBorder()))
    return;
comp.setBorder(new CompoundBorder(getMandatoryBorder(), comp.getBorder()));
voidsetText(JTextComponent textComp, String text)
sets text of textComp without moving its caret. 
if (text == null)
    text = "";
if (textComp.getCaret() instanceof DefaultCaret) {
    DefaultCaret caret = (DefaultCaret) textComp.getCaret();
    int updatePolicy = caret.getUpdatePolicy();
    caret.setUpdatePolicy(DefaultCaret.NEVER_UPDATE);
    try {
        textComp.setText(text);
...
voidsetTextComponentMargins(JTextComponent component)
set Text Component Margins 
setTextComponentMargins(component, DEFAULT_TEXT_COMPONENT_VERTICAL_MARGIN,
        DEFAULT_TEXT_COMPONENT_HORIZONAL_MARGIN);
voidsetTextComponentTransparent(JTextComponent paramJTextComponent)
set Text Component Transparent 
paramJTextComponent.setOpaque(false);
paramJTextComponent.putClientProperty("Synthetica.opaque", Boolean.valueOf(false));
paramJTextComponent.putClientProperty("Nimbus.Overrides.InheritDefaults", Boolean.valueOf(false));
paramJTextComponent.putClientProperty("Nimbus.Overrides", new UIDefaults());
voidsetTextComponentTransparent(JTextComponent textComponent)
set Text Component Transparent 
textComponent.setOpaque(false);
textComponent.putClientProperty("Synthetica.opaque", Boolean.valueOf(false));
textComponent.putClientProperty("Nimbus.Overrides.InheritDefaults", Boolean.valueOf(false));
textComponent.putClientProperty("Nimbus.Overrides", new UIDefaults());
voidsetTextComponentTransparent(JTextComponent textComponent)
Sets the text component transparent. 
textComponent.setOpaque(false);
textComponent.putClientProperty("Synthetica.opaque", false);
textComponent.putClientProperty("Nimbus.Overrides.InheritDefaults", false);
textComponent.putClientProperty("Nimbus.Overrides", new UIDefaults());
voidsetTextComponetIntegerValid(final JTextComponent c)
Set the text component in which only numerics (positive decimal integers with character 0-9). 
c.addKeyListener(new KeyAdapter() {
    @Override
    public void keyTyped(KeyEvent e) {
        if (e.getKeyChar() != KeyEvent.VK_BACK_SPACE)
            try {
                Integer.valueOf(c.getText() + e.getKeyChar());
            } catch (NumberFormatException nfe) {
                e.consume();
...