/**
* Adds a part to the current container if it isn't already in the container. The part may still
* be added to the container if the part supports having multiple copies of itself in a given
* container.
*
* @param providedPart the part to add
* @param localPart a part that shares attributes with <code>providedPart</code>, for example, it
* may have been backed by the same part descriptor, this part may already be in the current
* container
* @return a part that has been added to the current container, note that this may not necessarily
* be <code>providedPart</code>
* @see MPartDescriptor#isAllowMultiple()
*/
private MPart addPart(MPart providedPart, MPart localPart) {
MPartDescriptor descriptor = modelService.getPartDescriptor(providedPart.getElementId());
if (descriptor == null) {
// there is no part descriptor backing the provided part, just add it to the container
// if it's not already there
if (!isInContainer(providedPart)) {
adjustPlaceholder(providedPart);
addToLastContainer(null, providedPart);
}
} else {
if (providedPart != localPart && !descriptor.isAllowMultiple()) {
// multiple copies of this part are not allowed, just return the local one
return localPart;
}
// already in the container, return as is
if (isInContainer(providedPart)) {
return providedPart;
}
// corrects this part's placeholder if necessary
adjustPlaceholder(providedPart);
String category = descriptor.getCategory();
if (category == null) {
// no category, just add it to the end
addToLastContainer(null, providedPart);
} else {
if ("org.eclipse.e4.primaryDataStack".equals(category)) { // $NON-NLS-1$
MElementContainer<? extends MUIElement> container = getContainer();
MUIElement area = modelService.find("org.eclipse.ui.editorss", container); // $NON-NLS-1$
MPartStack activeStack = null;
if (area instanceof MPlaceholder && ((MPlaceholder) area).getRef() instanceof MArea) {
// Find the currently 'active' stack in the area
MArea a = (MArea) ((MPlaceholder) area).getRef();
MUIElement curActive = a.getSelectedElement();
while (curActive instanceof MElementContainer<?>) {
if (curActive instanceof MPartStack) {
activeStack = (MPartStack) curActive;
break;
}
MElementContainer<?> curContainer = (MElementContainer<?>) curActive;
curActive = curContainer.getSelectedElement();
}
}
if (activeStack != null) {
activeStack.getChildren().add(providedPart);
} else {
// Find the first visible stack in the area
List<MPartStack> sharedStacks =
modelService.findElements(area, null, MPartStack.class, null);
if (sharedStacks.size() > 0) {
for (MPartStack stack : sharedStacks) {
if (stack.isToBeRendered()) {
stack.getChildren().add(providedPart);
break;
}
}
} else {
addToLastContainer(null, providedPart);
}
}
} else {
@SuppressWarnings("rawtypes")
List<MElementContainer> containers =
modelService.findElements(
getContainer(),
null,
MElementContainer.class,
Collections.singletonList(category),
EModelService.PRESENTATION);
if (containers.isEmpty()) {
// couldn't find any containers with the specified tag, just add it to the
// end
addToLastContainer(category, providedPart);
} else {
// add the part to the container
MElementContainer<MPartSashContainerElement> container = containers.get(0);
MPlaceholder placeholder = providedPart.getCurSharedRef();
if (placeholder == null) {
container.getChildren().add(providedPart);
} else {
container.getChildren().add(placeholder);
}
}
}
}
}
return providedPart;
}
