Examples of javax.swing.text.Caret

javax.swing.text.Caret
A place within a document view that represents where things can be inserted into the document model. A caret has a position in the document referred to as a dot. The dot is where the caret is currently located in the model. There is a second position maintained by the caret that represents the other end of a selection called mark. If there is no selection the dot and mark will be equal. If a selection exists, the two values will be different.
The dot can be placed by either calling setDot or moveDot. Setting the dot has the effect of removing any selection that may have previously existed. The dot and mark will be equal. Moving the dot has the effect of creating a selection as the mark is left at whatever position it previously had. @author Timothy Prinzing

    private void updateTextActions(JTextComponent text) {
        if (text.getDocument() instanceof StyledDocument) {
            StyledDocument document = (StyledDocument) text.getDocument();
            boolean editable = text.isEditable();
            
            Caret caret = text.getCaret();
            int dot = caret.getDot();
            dot = dot > 0 ? dot - 1 : dot;
            Element elem = document.getCharacterElement(dot);
            AttributeSet set = elem.getAttributes();
            
            setBoldEnabled(editable);

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  class LeftAction extends AbstractAction {


    public void actionPerformed(ActionEvent e) {
      if (isVisible()) {
        JTextComponent comp = ac.getTextComponent();
        Caret c = comp.getCaret();
        int dot = c.getDot();
        if (dot > 0) {
          c.setDot(--dot);
          // Ensure moving left hasn't moved us up a line, thus
          // hiding the popup window.
          if (comp.isVisible()) {
            if (lastLine!=-1) {
              doAutocomplete();

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  class RightAction extends AbstractAction {


    public void actionPerformed(ActionEvent e) {
      if (isVisible()) {
        JTextComponent comp = ac.getTextComponent();
        Caret c = comp.getCaret();
        int dot = c.getDot();
        if (dot < comp.getDocument().getLength()) {
          c.setDot(++dot);
          // Ensure moving right hasn't moved us up a line, thus
          // hiding the popup window.
          if (comp.isVisible()) {
            if (lastLine!=-1) {
              doAutocomplete();

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    //System.out.println("ENTRE: " + c.getReplacementText());
    
    JTextComponent textComp = getTextComponent();
    String alreadyEntered = c.getAlreadyEntered(textComp);
    hidePopupWindow();
    Caret caret = textComp.getCaret();


    int dot = caret.getDot();
    int len = alreadyEntered.length();
    int start = dot-len;
    String replacement = getReplacementText(c, textComp.getDocument(),
                        start, len);


    caret.setDot(start);
    caret.moveDot(dot);
    textComp.replaceSelection(replacement);
    /*
    Document doc = textComp.getDocument();
try {
    if (doc instanceof AbstractDocument) {

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            }


            c.setMargin(margin);
        }


        Caret caret = c.getCaret();


        if (caret instanceof UIResource) {
            Object o = style.get(context, prefix + ".caretBlinkRate");


            if (o != null && o instanceof Integer) {
                Integer rate = (Integer) o;


                caret.setBlinkRate(rate.intValue());
            }
        }
    }

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    return execute(new GuiQuery<JTextComponent>() {
      protected JTextComponent executeInEDT() {
        Component focusOwner = focusOwner();
        if (!(focusOwner instanceof JTextComponent)) return null;
        JTextComponent textComponent = (JTextComponent)focusOwner;
        Caret caret = textComponent.getCaret();
        if (caret == null || !caret.isVisible()) return null;
        caret.setVisible(false);
        return textComponent;
      }
    });
  }

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  @RunsInEDT
  private static void showCaretOf(final JTextComponent textComponent) {
    execute(new GuiTask() {
      protected void executeInEDT() {
        Caret caret = textComponent.getCaret();
        if (caret != null) caret.setVisible(true);
      }
    });
  }

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    }


    // If the user wants to overwrite text...
    if (textMode==OVERWRITE_MODE && !"\n".equals(text)) {


      Caret caret = getCaret();
      int caretPos = caret.getDot();
      Document doc = getDocument();
      Element map = doc.getDefaultRootElement();
      int curLine = map.getElementIndex(caretPos);
      int lastLine = map.getElementCount() - 1;


      try {


        // If we're not at the end of a line, select the characters
        // that will be overwritten (otherwise JTextArea will simply
        // insert in front of them).
        int curLineEnd = getLineEndOffset(curLine);
        if (caretPos==caret.getMark() && caretPos!=curLineEnd) {
          if (curLine==lastLine)
            caretPos = Math.min(caretPos+text.length(), curLineEnd);
          else
            caretPos = Math.min(caretPos+text.length(), curLineEnd-1);
          caret.moveDot(caretPos);//moveCaretPosition(caretPos);
        }


      } catch (BadLocationException ble) { // Never happens
        UIManager.getLookAndFeel().provideErrorFeedback(this);
        ble.printStackTrace();

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    protected RTextAreaMutableCaretEvent(RTextArea textArea) {
      super(textArea);
    }


    public void focusGained(FocusEvent e) {
      Caret c = getCaret();
      boolean enabled = c.getDot()!=c.getMark();
      cutAction.setEnabled(enabled);
      copyAction.setEnabled(enabled);
      undoManager.updateActions(); // To reflect this text area.
    }

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    public void focusLost(FocusEvent e) {
    }


    public void mouseDragged(MouseEvent e) {
      if ((e.getModifiers() & MouseEvent.BUTTON1_MASK) != 0) {
        Caret caret = getCaret();
        dot = caret.getDot();
        mark = caret.getMark();
        fireCaretUpdate(this);
      }
    }

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