/**
* 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);
}
/* */ public void paint(Graphics paramGraphics, Shape paramShape) /* */ {
/* 356 */ Rectangle localRectangle = (Rectangle) paramShape;
/* 357 */ this.tabBase = localRectangle.x;
/* 358 */ JTextComponent localJTextComponent = (JTextComponent) getContainer();
/* 359 */ this.sel0 = localJTextComponent.getSelectionStart();
/* 360 */ this.sel1 = localJTextComponent.getSelectionEnd();
/* 361 */ this.unselected =
(localJTextComponent.isEnabled()
? localJTextComponent.getForeground()
: localJTextComponent.getDisabledTextColor());
/* */
/* 363 */ Caret localCaret = localJTextComponent.getCaret();
/* 364 */ this.selected =
((localCaret.isSelectionVisible()) && (localJTextComponent.getHighlighter() != null)
? localJTextComponent.getSelectedTextColor()
: this.unselected);
/* */
/* 366 */ paramGraphics.setFont(localJTextComponent.getFont());
/* */
/* 369 */ super.paint(paramGraphics, paramShape);
/* */ }
/**
* Draw the line numbers
*
* @param g
*/
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
((Graphics2D) g)
.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// Determine the width of the space available to draw the line number
FontMetrics fontMetrics = component.getFontMetrics(component.getFont());
Insets insets = getInsets();
int availableWidth = getSize().width - insets.left - insets.right;
// Determine the rows to draw within the clipped bounds.
Rectangle clip = g.getClipBounds();
int rowStartOffset = component.viewToModel(new Point(0, clip.y));
int endOffset = component.viewToModel(new Point(0, clip.y + clip.height));
while (rowStartOffset <= endOffset) {
try {
if (isCurrentLine(rowStartOffset)) g.setColor(getCurrentLineForeground());
else g.setColor(getForeground());
// Get the line number as a string and then determine the
// "X" and "Y" offsets for drawing the string.
String lineNumber = getTextLineNumber(rowStartOffset);
int stringWidth = fontMetrics.stringWidth(lineNumber);
int x = getOffsetX(availableWidth, stringWidth) + insets.left;
int y = getOffsetY(rowStartOffset, fontMetrics);
g.drawString(lineNumber, x, y);
// Move to the next row
rowStartOffset = Utilities.getRowEnd(component, rowStartOffset) + 1;
} catch (Exception e) {
break;
}
}
}
