void releaseParent() {
super.releaseParent();
if (this == parent.getCaret()) parent.setCaret(null);
}
void createWidget() {
createHandle();
if (parent.getCaret() == null) {
parent.setCaret(this);
}
}
/**
* Returns <code>true</code> if the receiver is visible and all of the receiver's ancestors are
* visible and <code>false</code> otherwise.
*
* @return the receiver's visibility state
* @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>
*
* @see #getVisible
*/
public boolean isVisible() {
checkWidget();
return OS.UIElement_IsVisible(handle) && parent.isVisible() && hasFocus();
}