Bug 36672 call hierarchy: Should show a progress bar
The Call Hierarchy view should show a progress bar when searching for callers/callees, allowing the user to abort the search.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewer.java
setLabelProvider(new CallHierarchyLabelProvider());
        JavaUIHelp.setHelp(this, IJavaHelpContextIds.CALL_HIERARCHY_VIEW);
        fOpen= new OpenLocationAction(part.getSite());
        addOpenListener(new IOpenListener() {
            public void open(OpenEvent event) {
                fOpen.run();
            }
        });
        setInput(TreeRoot.EMPTY_TREE);
    }
    /**
     * @param wrapper
     */
    void setMethodWrapper(MethodWrapper wrapper) {
        setInput(getTreeRoot(wrapper));
        getTree().setFocus();
        getTree().setSelection(new TreeItem[] { getTree().getItems()[0] });
    }
    CallHierarchyViewPart getPart() {
        return fPart;
    }
    /**
     *
     */
    void setFocus() {
        getControl().setFocus();
    }
    boolean isInFocus() {
        return getControl().isFocusControl();
    }