/**
* Constrain all the lists' selections such that the relative differences between them stay the
* same no matter how the user shifts any of the selections upwards/downwards.
*
* <p>Only works if the lists' selection models are instances of {@link
* BoundedListSelectionModel}.
*/
private void updateSelectionBounds() {
if (listsAndSelectionIndices.isEmpty()) {
return;
}
if (!(listsAndSelectionIndices.keySet().iterator().next().getSelectionModel()
instanceof BoundedListSelectionModel)) {
return;
}
int minSelIndex = Integer.MAX_VALUE;
int minHeadroom = Integer.MAX_VALUE;
for (Entry<ImageListView, Integer> e : listsAndSelectionIndices.entrySet()) {
ImageListView list = e.getKey();
Integer i = e.getValue();
if (i == null) {
continue;
}
if (i < minSelIndex) {
minSelIndex = i;
}
int length = list.getLength();
if (length - 1 - i < minHeadroom) {
minHeadroom = length - 1 - i;
}
}
for (ImageListView l : listsAndSelectionIndices.keySet()) {
ListSelectionModel sm = l.getSelectionModel();
if (!(sm instanceof BoundedListSelectionModel)) {
continue;
}
BoundedListSelectionModel bsm = (BoundedListSelectionModel) sm;
Integer idx = listsAndSelectionIndices.get(l);
if (idx == null) {
bsm.disableBounds();
l.disableVisibilityLimits();
continue;
}
int lower = idx - minSelIndex;
int upper = idx + minHeadroom;
if (lower < 0 || lower > upper) {
System.err.println(
"shouldn't happen: trying to set selection bounds of list (length="
+ l.getLength()
+ " to ["
+ lower
+ ","
+ upper
+ "]");
continue;
}
bsm.setLowerBound(lower);
l.setLowerVisibilityLimit(lower);
bsm.setUpperBound(upper);
l.setUpperVisibilityLimit(upper);
}
}
private void clearSelectionBounds() {
if (listsAndSelectionIndices.isEmpty()) {
return;
}
for (ImageListView l : listsAndSelectionIndices.keySet()) {
ListSelectionModel sm = l.getSelectionModel();
if (!(sm instanceof BoundedListSelectionModel)) {
continue;
}
BoundedListSelectionModel bsm = (BoundedListSelectionModel) sm;
bsm.disableBounds();
l.disableVisibilityLimits();
}
}