CornerCaretpublic class CornerCaret extends DefaultCaret
| Constructors Summary |
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public CornerCaret()
setBlinkRate(500); // half a second
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| Methods Summary |
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| protected synchronized void | damage(java.awt.Rectangle r)
if (r == null) return;
// give values to x,y,width,height (inherited from java.awt.Rectangle)
x = r.x;
y = r.y + (r.height * 4 / 5 - 3);
width = 5;
height = 5;
repaint(); // calls getComponent().repaint(x, y, width, height)
| | public static void | main(java.lang.String[] args)
JFrame frame = new JFrame("CornerCaret demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea area = new JTextArea(8, 32);
area.setCaret(new CornerCaret());
area.setText("This is the story\nof the hare who\nlost his spectacles.");
frame.getContentPane().add(new JScrollPane(area), BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
| | public void | paint(java.awt.Graphics g)
JTextComponent comp = getComponent();
if (comp == null) return;
int dot = getDot();
Rectangle r = null;
try {
r = comp.modelToView(dot);
} catch (BadLocationException e) { return; }
if (r == null) return;
int dist = r.height * 4 / 5 - 3; // will be distance from r.y to top
if ( (x != r.x) || (y != r.y + dist) ) {
// paint() has been called directly, without a previous call to
// damage(), so do some cleanup. (This happens, for example, when the
// text component is resized.)
repaint(); // erase previous location of caret
x = r.x; // set new values for x,y,width,height
y = r.y + dist;
width = 5;
height = 5;
}
if ( isVisible() ) {
g.setColor(comp.getCaretColor());
g.drawLine(r.x, r.y + dist, r.x, r.y + dist + 4); // 5 vertical pixels
g.drawLine(r.x, r.y + dist + 4, r.x + 4, r.y + dist + 4); // 5 horiz px
}
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