/**
* Sets the zero-relative index of the line which is currently at the top of the receiver. This
* index can change when lines are scrolled or new lines are added and removed.
*
* @param index the index of the top item
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*/
public void setTopIndex(int index) {
checkWidget();
if (variant == TextUtils.TEXT_EDIT) {
index = Math.min(Math.max(index, 0), OS.QTextEdit_swt_getLineCount(topHandle) - 1);
OS.QTextEdit_swt_setTopIndex(topHandle, index);
}
}
/**
* Returns the number of lines.
*
* @return the number of lines in the widget
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*/
public int getLineCount() {
checkWidget();
if (variant == TextUtils.LINE_EDIT) {
return 1;
} else {
forceTextLayout();
return OS.QTextEdit_swt_getLineCount(topHandle);
}
}