@Override
public MPart showPart(MPart part, PartState partState) {
Assert.isNotNull(part);
Assert.isNotNull(partState);
MPart addedPart = addPart(part);
MPlaceholder localPlaceholder = getLocalPlaceholder(addedPart);
// correct the placeholder setting if necessary
if (localPlaceholder != null && addedPart.getCurSharedRef() != localPlaceholder) {
addedPart.setCurSharedRef(localPlaceholder);
}
switch (partState) {
case ACTIVATE:
activate(addedPart);
return addedPart;
case VISIBLE:
MPart activePart = getActivePart();
if (activePart == null
|| (activePart != addedPart && getParent(activePart) == getParent(addedPart))) {
delegateBringToTop(addedPart);
activate(addedPart);
} else {
bringToTop(addedPart);
}
return addedPart;
case CREATE:
createElement(addedPart);
return addedPart;
}
return addedPart;
}
private void adjustPlaceholder(MPart part) {
if (isShared(part)) {
MPlaceholder placeholder = part.getCurSharedRef();
// if this part doesn't have any placeholders, we need to make one
if (placeholder == null
// alternatively, if it has one but it's not in the current container, then we
// need to spawn another one as we don't want to reuse the same one and end up
// shifting that placeholder to the current container during the add operation
|| (placeholder.getParent() != null && !isInContainer(placeholder))) {
placeholder = createSharedPart(part);
part.setCurSharedRef(placeholder);
}
}
}