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

   * @see #getRoundedSelectionEdges()
   */
  public void setRoundedSelectionEdges(boolean rounded) {
    if (roundedSelectionEdges!=rounded) {
      roundedSelectionEdges = rounded;
      Caret c = getCaret();
      if (c instanceof ConfigurableCaret) {
        ((ConfigurableCaret)c).setRoundedSelectionEdges(rounded);
        if (c.getDot()!=c.getMark()) { // e.g., there's is a selection
          repaint();
        }
      }
      firePropertyChange(ROUNDED_SELECTION_PROPERTY, !rounded,
                      rounded);

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    public int getCurrentOffset() {
        JEditorPane ep = contextDispatcher.getCurrentEditor();
        if (ep == null) {
            return -1;
        }
        Caret caret = ep.getCaret();
        if (caret == null) {
            return -1;
        }
        return caret.getDot();
    }

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            // Obtain the offset where to jump
            pos = Utilities.getRowStartFromLineOffset(doc, line);
        }


        if (pos != -1) {
            Caret caret = pane.getCaret();
            if (caret instanceof BaseCaret) { // support extended scroll mode
                BaseCaret bCaret = (BaseCaret)caret;
                bCaret.setDot(pos, bCaret, EditorUI.SCROLL_FIND);
            }
            else {
                caret.setDot(pos);
            }
        }
    }

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        if (doc == null) {
            return false;
        }
        try {
            Caret caret = target.getCaret();
            int p0 = Math.min(caret.getDot(), caret.getMark());
            int p1 = Math.max(caret.getDot(), caret.getMark());
            doc.remove(p0, p1 - p0);
            int start = caret.getDot();
            doc.insertString(start, getText(), null);
        } catch (Exception ex) {
            ex.printStackTrace();
            return false;
        }

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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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            if (getEditor(e).isEditable()) {
                return;
            }


            JEditorPane editor = getEditor(e);
            Caret caret = editor.getCaret();
            HTMLDocument doc = getHTMLDocument(editor);


            Element link = getNextLinkElement(doc, caret.getDot(), isForward());
            if (link != null) {
                moveHighlight(editor,
                              link.getStartOffset(), link.getEndOffset());
            }
        }

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        installDefaults();
        LookAndFeel.installProperty(component, StringConstants.OPAQUE_PROPERTY,
                                    Boolean.TRUE);


        if (Utilities.isUIResource(component.getCaret())) {
            Caret caret = createCaret();
            component.setCaret(caret);
            caret.setBlinkRate(UIManager.getInt(getPropertyPrefix()
                                                  + ".caretBlinkRate"));
        }


        if (Utilities.isUIResource(component.getHighlighter())) {
            component.setHighlighter(createHighlighter());

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        final Document doc = document;
        
        readLock(doc);
        try {
            Highlighter highlighter = component.getHighlighter();
            Caret caret = component.getCaret();
            if (component.isOpaque()) {
                paintBackground(g);
            }
            if (highlighter != null) {
                highlighter.paint(g);
            }
            Rectangle visibleRect = getVisibleEditorRect();
            if (visibleRect != null) {
                getRootView().setSize(visibleRect.width, visibleRect.height);
                getRootView().paint(g, visibleRect);
            }
            caret.paint(g);
        } finally {
            readUnlock(doc);
        }
    }

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    public Dimension getMinimumSize(final JComponent c) {
        if (!(c instanceof JTextComponent)) {
            throw new IllegalArgumentException(Messages.getString("swing.77")); //$NON-NLS-1$
        }
        Dimension dim = super.getMinimumSize(c);
        Caret caret = ((JTextComponent)c).getCaret();
        if (caret != null && caret instanceof DefaultCaret) {
            dim.width += ((DefaultCaret)caret).width;
        }
        return dim;
    }

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