public KeyboardViewer() {
canvas.setMinimumSize(new Dimension(1, 1));
canvas.setFocusable(true);
canvas.addFocusListener(
new FocusListener() {
@Override
public void focusLost(FocusEvent e) {
focus = false;
FocusManager.get().lostFocus(KeyboardViewer.this);
}
@Override
public void focusGained(FocusEvent e) {
focus = true;
FocusManager.get().gainedFocus(KeyboardViewer.this);
}
});
Thread t =
new Thread() {
public void run() {
try {
canvas.requestFocus();
while (keepAlive) {
if (canvas.isDisplayable()) {
if (canvas.getWidth() > 0 && canvas.getHeight() > 0) {
BufferedImage img = new BufferedImage(canvas.getWidth(), canvas.getHeight(), 2);
Graphics2D g2 = (Graphics2D) img.getGraphics();
String draw = focus ? "ACTIVE" : "Inactive";
g2.setFont(font);
g2.setBackground(BACKGROUND_COLOR);
g2.setColor(FOREGROUND_COLOR);
Rectangle2D bounds = g2.getFontMetrics().getStringBounds(draw, g2);
g2.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());
g2.drawString(
draw,
(int) (canvas.getWidth() / 2d - bounds.getCenterX()),
(int) (canvas.getHeight() / 2d - bounds.getCenterY()));
g2.dispose();
Graphics2D g = (Graphics2D) canvas.getGraphics();
if (g != null) {
g.drawImage(img, 0, 0, img.getWidth(), img.getHeight(), null);
g.dispose();
}
}
}
Thread.sleep(16L);
}
} catch (Exception e) {
e.printStackTrace();
try {
Thread.sleep(16L);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
}
};
t.start();
}
private void createFrame() {
frame = new JFrame(title);
frame.setSize(dimension);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
frame.setFocusable(true);
frame.setVisible(true);
canvas = new Canvas();
canvas.setPreferredSize(dimension);
canvas.setMaximumSize(dimension);
canvas.setMinimumSize(dimension);
canvas.setFocusable(false);
frame.add(canvas);
frame.pack();
}