/*
* We need to know if the caret is currently positioned on the line we
* are about to paint so the line number can be highlighted.
*/
private boolean isCurrentLine(int rowStartOffset) {
int caretPosition = component.getCaretPosition();
Element root = component.getDocument().getDefaultRootElement();
if (root.getElementIndex(rowStartOffset) == root.getElementIndex(caretPosition)) return true;
else return false;
}
// public static final String showElementTreeAction = "showElementTree";
// -------------------------------------------------------------
public void openFile(String currDirStr, String currFileStr) {
if (fileDialog == null) {
fileDialog = new FileDialog(this);
}
fileDialog.setMode(FileDialog.LOAD);
if (!(currDirStr.equals(""))) {
fileDialog.setDirectory(currDirStr);
}
if (!(currFileStr.equals(""))) {
fileDialog.setFile(currFileStr);
}
fileDialog.show();
String file = fileDialog.getFile(); // cancel pushed
if (file == null) {
return;
}
String directory = fileDialog.getDirectory();
File f = new File(directory, file);
if (f.exists()) {
Document oldDoc = getEditor().getDocument();
if (oldDoc != null)
// oldDoc.removeUndoableEditListener(undoHandler);
/*
if (elementTreePanel != null) {
elementTreePanel.setEditor(null);
}
*/
getEditor().setDocument(new PlainDocument());
fileDialog.setTitle(file);
Thread loader = new FileLoader(f, editor1.getDocument());
loader.start();
}
}
/*
* Get the line number to be drawn. The empty string will be returned
* when a line of text has wrapped.
*/
protected String getTextLineNumber(int rowStartOffset) {
Element root = component.getDocument().getDefaultRootElement();
int index = root.getElementIndex(rowStartOffset);
Element line = root.getElement(index);
if (line.getStartOffset() == rowStartOffset) return String.valueOf(index + 1);
else return "";
}
/**
* Create a line number component for a text component.
*
* @param argComponent the related text component
* @param argMinimumDisplayDigits the number of digits used to calculate the minimum width of the
* component.
*/
public TextLineNumber(JTextComponent argComponent, int argMinimumDisplayDigits) {
component = argComponent;
setFont(argComponent.getFont());
setBorderGap(5);
setCurrentLineForeground(Color.RED);
setDigitAlignment(RIGHT);
setMinimumDisplayDigits(argMinimumDisplayDigits);
argComponent.getDocument().addDocumentListener(this);
argComponent.addCaretListener(this);
argComponent.addPropertyChangeListener("font", this);
}
//
// Implement CaretListener interface
//
@Override
public void caretUpdate(CaretEvent e) {
// Get the line the caret is positioned on
int caretPosition = component.getCaretPosition();
Element root = component.getDocument().getDefaultRootElement();
int currentLine = root.getElementIndex(caretPosition);
// Need to repaint so the correct line number can be highlighted
if (lastLine != currentLine) {
repaint();
lastLine = currentLine;
}
}
/*
* Determine the Y offset for the current row
*/
private int getOffsetY(int rowStartOffset, FontMetrics fontMetrics) throws BadLocationException {
// Get the bounding rectangle of the row
Rectangle r = component.modelToView(rowStartOffset);
int lineHeight = fontMetrics.getHeight();
int y = r.y + r.height;
int descent = 0;
// The text needs to be positioned above the bottom of the bounding
// rectangle based on the descent of the font(s) contained on the row.
if (r.height == lineHeight) {
// default font is being used
descent = fontMetrics.getDescent();
} else {
// We need to check all the attributes for font changes
if (fonts == null) {
fonts = new HashMap<String, FontMetrics>();
}
Element root = component.getDocument().getDefaultRootElement();
int index = root.getElementIndex(rowStartOffset);
Element line = root.getElement(index);
for (int i = 0; i < line.getElementCount(); i++) {
Element child = line.getElement(i);
AttributeSet as = child.getAttributes();
String fontFamily = (String) as.getAttribute(StyleConstants.FontFamily);
Integer fontSize = (Integer) as.getAttribute(StyleConstants.FontSize);
String key = fontFamily + fontSize;
FontMetrics fm = fonts.get(key);
if (fm == null) {
Font font = new Font(fontFamily, Font.PLAIN, fontSize);
fm = component.getFontMetrics(font);
fonts.put(key, fm);
}
descent = Math.max(descent, fm.getDescent());
}
}
return y - descent;
}
/** Calculate the width needed to display the maximum line number */
private void setPreferredWidth() {
Element root = component.getDocument().getDefaultRootElement();
int lines = root.getElementCount();
int digits = Math.max(String.valueOf(lines).length(), minimumDisplayDigits);
// Update sizes when number of digits in the line number changes
if (lastDigits != digits) {
lastDigits = digits;
FontMetrics fontMetrics = getFontMetrics(getFont());
int width = fontMetrics.charWidth('0') * digits;
Insets insets = getInsets();
int preferredWidth = insets.left + insets.right + width;
Dimension d = getPreferredSize();
d.setSize(preferredWidth, HEIGHT);
setPreferredSize(d);
setSize(d);
}
}
/*
* A document change may affect the number of displayed lines of text.
* Therefore the lines numbers will also change.
*/
private void documentChanged() {
// View of the component has not been updated at the time
// the DocumentEvent is fired
SwingUtilities.invokeLater(
() -> {
try {
int endPos = component.getDocument().getLength();
Rectangle rect = component.modelToView(endPos);
if (rect != null && rect.y != lastHeight) {
setPreferredWidth();
repaint();
lastHeight = rect.y;
}
} catch (BadLocationException ex) {
/* nothing to do */
}
});
}
