public void keyTyped(KeyEvent e) {
if (!enabled) return;
TextComponent input = (TextComponent) e.getSource();
String strContent = input.getText();
char c = e.getKeyChar();
if (!isModifier(c)) return;
int pos = input.getCaretPosition();
if (pos <= 0) return;
int idx = pos - 1; // position of the character to be modified
char last = strContent.charAt(idx);
char newVal = last;
if (isCircumflex(c, last)) newVal = encoding.addCircumflex(last);
else if (isBreve(c, last)) newVal = encoding.addBreveHorn(last);
else if (isHorn(c, last)) newVal = encoding.addBreveHorn(last);
else if (isStroke(c, last)) newVal = encoding.addStroke(last);
else if (isToneMark(c)) {
idx = indexOfToneCarrier(pos, strContent);
if (idx < 0) return;
last = strContent.charAt(idx);
newVal = encoding.modifyTone(last, getToneMarkId(c));
}
if (last != newVal) {
input.setCaretPosition(idx);
TextField txt;
// input.moveCaretPosition(idx+1);
// input.replaceSelection("" + newVal);
input.setCaretPosition(pos);
e.consume();
}
}
protected int indexOfToneCarrier(int pos, String strContent) {
int idx = indexOfLastVowel(pos, strContent);
if (idx <= 0) return idx;
char c = strContent.charAt(idx - 1);
if (!encoding.isVowel(c) && !eq(c, 'q')) return idx;
if (encoding.hasDiacritic(strContent.charAt(idx))) return idx;
if (encoding.hasDiacritic(c)) return idx - 1;
if (eq(c, 'q') && eq(strContent.charAt(idx), 'u')) return -1;
if (eq(c, 'o') && eq(strContent.charAt(idx), 'a')) return idx;
if (eq(c, 'o') && eq(strContent.charAt(idx), 'e')) return idx;
if (eq(c, 'u') && eq(strContent.charAt(idx), 'y')) return idx;
if ((idx >= 2) && eq(c, 'u') && eq(strContent.charAt(idx - 2), 'q')) return idx;
if ((idx >= 2) && eq(c, 'i') && eq(strContent.charAt(idx - 2), 'g')) return idx;
return idx - 1;
}
protected int indexOfLastVowel(int pos, String strContent) {
int beg = Math.max(0, pos - 3);
for (int i = pos - 1; i >= beg; i--) {
char c = strContent.charAt(i);
if (encoding.isVowel(c)) return i;
}
return -1;
}