@Override
public void update(AnActionEvent e) {
final DataContext dc = e.getDataContext();
final Presentation presentation = e.getPresentation();
// presentation.setVisible(isVisible(dc));
presentation.setEnabled(isVisible(dc) && isEnabled(dc));
}
public void actionPerformed(AnActionEvent e) {
final DataContext dc = e.getDataContext();
if ((!isVisible(dc)) || (!isEnabled(dc))) return;
final Project project = CommonDataKeys.PROJECT.getData(dc);
final Iterable<Pair<VirtualFilePointer, FileStatus>> iterable =
e.getRequiredData(VcsDataKeys.UPDATE_VIEW_FILES_ITERABLE);
final Label before = (Label) e.getRequiredData(VcsDataKeys.LABEL_BEFORE);
final Label after = (Label) e.getRequiredData(VcsDataKeys.LABEL_AFTER);
final String selectedUrl = VcsDataKeys.UPDATE_VIEW_SELECTED_PATH.getData(dc);
MyDiffRequestChain requestChain =
new MyDiffRequestChain(project, iterable, before, after, selectedUrl);
DiffManager.getInstance().showDiff(project, requestChain, DiffDialogHints.FRAME);
}