public void deleteNextChar() throws DocumentValidationException {
if (this.hasSelection()) {
this.deleteSelection();
} else {
int offset = this.getCaretOffset();
VEXDocument doc = this.getDocument();
int n = doc.getLength() - 1;
VEXElement element = doc.getElementAt(offset);
if (offset == n) {
// nop
} else if (this.isBetweenMatchingElements(offset)) {
this.joinElementsAt(offset);
} else if (this.isBetweenMatchingElements(offset + 1)) {
this.joinElementsAt(offset + 1);
} else if (element.isEmpty()) {
// deleting the right sentinel of an empty element
// so just delete the whole element an move on
this.moveTo(offset - 1, false);
this.moveTo(offset + 1, true);
this.deleteSelection();
} else if (doc.getElementAt(offset + 1).isEmpty()) {
// deleting the left sentinel of an empty element
// so just delete the whole element an move on
this.moveTo(offset + 2, true);
this.deleteSelection();
} else {
if (doc.getCharacterAt(offset) != 0) {
this.moveTo(offset, false);
this.moveTo(offset + 1, true);
this.deleteSelection();
}
}
}
}
/**
* Joins the elements at the given offset. Only works if isBetweenMatchingElements returns true
* for the same offset. Afterwards, the caret is left at the point where the join occurred.
*
* @param offset Offset where the two elements meet.
*/
private void joinElementsAt(int offset) throws DocumentValidationException {
if (!isBetweenMatchingElements(offset)) {
throw new DocumentValidationException("Cannot join elements at offset " + offset);
}
boolean success = false;
try {
this.beginWork();
this.moveTo(offset + 1);
VEXElement element = this.getCurrentElement();
boolean moveContent = !element.isEmpty();
VEXDocumentFragment frag = null;
if (moveContent) {
this.moveTo(element.getEndOffset(), true);
frag = this.getSelectedFragment();
this.deleteSelection();
}
this.moveBy(-1);
this.moveBy(2, true);
this.deleteSelection();
this.moveBy(-1);
if (moveContent) {
int savedOffset = this.getCaretOffset();
this.insertFragment(frag);
this.moveTo(savedOffset, false);
}
success = true;
} finally {
this.endWork(success);
}
}