void updateViewport() {
baseEditor.lineCountEvent(text.getLineCount());
int start = 0;
try {
start = text.getTopIndex() - 1;
} catch (Exception e) {
e.printStackTrace(System.out);
}
if (start < 0) start = 0;
int end = start + text.getClientArea().height / text.getLineHeight();
baseEditor.visibleTextEvent(start, end - start + 2);
}
