public void handleLayerEvent(IStructuralChangeEvent event) {
PositionCoordinate topLeftPosition = freezeLayer.getTopLeftPosition();
PositionCoordinate bottomRightPosition = freezeLayer.getBottomRightPosition();
Collection<StructuralDiff> columnDiffs = event.getColumnDiffs();
if (columnDiffs != null) {
int leftOffset = 0;
int rightOffset = 0;
for (StructuralDiff columnDiff : columnDiffs) {
switch (columnDiff.getDiffType()) {
case ADD:
Range afterPositionRange = columnDiff.getAfterPositionRange();
if (afterPositionRange.start < topLeftPosition.columnPosition) {
leftOffset += afterPositionRange.size();
}
if (afterPositionRange.start <= bottomRightPosition.columnPosition) {
rightOffset += afterPositionRange.size();
}
break;
case DELETE:
Range beforePositionRange = columnDiff.getBeforePositionRange();
if (beforePositionRange.start < topLeftPosition.columnPosition) {
leftOffset -=
Math.min(beforePositionRange.end, topLeftPosition.columnPosition + 1)
- beforePositionRange.start;
}
if (beforePositionRange.start <= bottomRightPosition.columnPosition) {
rightOffset -=
Math.min(beforePositionRange.end, bottomRightPosition.columnPosition + 1)
- beforePositionRange.start;
}
break;
}
}
topLeftPosition.columnPosition += leftOffset;
bottomRightPosition.columnPosition += rightOffset;
}
Collection<StructuralDiff> rowDiffs = event.getRowDiffs();
if (rowDiffs != null) {
int leftOffset = 0;
int rightOffset = 0;
for (StructuralDiff rowDiff : rowDiffs) {
switch (rowDiff.getDiffType()) {
case ADD:
Range afterPositionRange = rowDiff.getAfterPositionRange();
if (afterPositionRange.start < topLeftPosition.rowPosition) {
leftOffset += afterPositionRange.size();
}
if (afterPositionRange.start <= bottomRightPosition.rowPosition) {
rightOffset += afterPositionRange.size();
}
break;
case DELETE:
Range beforePositionRange = rowDiff.getBeforePositionRange();
if (beforePositionRange.start < topLeftPosition.rowPosition) {
leftOffset -=
Math.min(beforePositionRange.end, topLeftPosition.rowPosition + 1)
- beforePositionRange.start;
}
if (beforePositionRange.start <= bottomRightPosition.rowPosition) {
rightOffset -=
Math.min(beforePositionRange.end, bottomRightPosition.rowPosition + 1)
- beforePositionRange.start;
}
break;
}
}
topLeftPosition.rowPosition += leftOffset;
bottomRightPosition.rowPosition += rightOffset;
}
}