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

DimensiongetPreferredScrollableViewportSize(javax.swing.text.JTextComponent t, Dimension ans)
Returns the preferred size of the viewport for component 't'. 
java.awt.Container p = t.getParent();
if (p instanceof javax.swing.JViewport) {
    p = p.getParent();
    if (p instanceof javax.swing.JScrollPane)
        shrink(ans, p.getMaximumSize());
return ans;
intgetRenderedLineOfChar(JTextComponent comp, int charIdx)
Determines the displayed line on which a given character is rendered on a JTextComponent. 
int charCount = 0;
int lineCount = 0;
View document = comp.getUI().getRootView(comp).getView(0);
if (document != null) {
    for (int paragraphIdx = 0; paragraphIdx < document.getViewCount(); paragraphIdx++) {
        View paragraph = document.getView(paragraphIdx);
        for (int lineIdx = 0; lineIdx < paragraph.getViewCount(); lineIdx++) {
            View line = paragraph.getView(lineIdx);
...
ColorgetStoredBackground(JTextComponent comp)
Returns the background color that has been previously stored for the given component, or null if none. 
return (Color) comp.getClientProperty(STORED_BACKGROUND_KEY);
ColorgetStoredBackground(JTextComponent comp)
Returns the background color that has been previously stored for the given component, or null if none. 
return (Color) comp.getClientProperty(STORED_BACKGROUND_KEY);
booleanhighlighterIsNext(JTextComponent textComponent, boolean forwards, Highlighter.Highlight highlight)
highlighter Is Next 
final int minOffset = Math.min(highlight.getStartOffset(), highlight.getEndOffset());
final int maxOffset = Math.max(highlight.getStartOffset(), highlight.getEndOffset());
if (forwards) {
    return minOffset > textComponent.getSelectionEnd();
} else {
    return maxOffset < textComponent.getSelectionStart();
voidimplyDisabled(final JCheckBox checked, final boolean checkedState, final JTextComponent changed)
Checks state of the checked checkbox and if state is checkedState than to disable changed text field and clean it. 
ActionListener l = new ActionListener() {
    String previousState;
    public void actionPerformed(ActionEvent e) {
        if (checked.isSelected() == checkedState) {
            if (previousState == null) {
                previousState = changed.getText();
            changed.setEnabled(false);
...
JScrollPaneinScrollPane(JTextComponent textComponent, boolean autoscroll)
in Scroll Pane 
JScrollPane pane = new JScrollPane(textComponent);
if (autoscroll) {
    DefaultCaret caret = (DefaultCaret) textComponent.getCaret();
    caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
    pane.setAutoscrolls(true);
return pane;
voidinstallUi(JTextComponent txt)
Install the border 
txt.setOpaque(false);
Insets margin = txt.getMargin();
if (margin == null) {
    margin = new Insets(5, 5, 5, 5);
Border marginBorder = BorderFactory.createEmptyBorder(margin.top + 3, margin.left, margin.bottom + 3,
        margin.right);
CompoundBorder border = new CompoundBorder(BorderFactory.createLineBorder(Color.WHITE), marginBorder);
...
voidinstallUndoManager(JTextComponent textComponent)
install Undo Manager 
installUndoManager(textComponent, new UndoManager());
booleanisCompletelyVisible(final JTextComponent scrollableComponent, final int pos, final Rectangle visibleRect)
is Completely Visible 
Rectangle r = modelToView(scrollableComponent, pos);
return intersects(r, visibleRect);