In the context of constructive trust, how have the courts in Canada treated constructive trusts?

In the concluding portion of her analysis, McLachlin J. stated: 43 I conclude that in Canada, under the broad umbrella of good conscience, constructive trusts are recognized both for wrongful acts like fraud and breach of duty of loyalty, as well as to remedy unjust enrichment and corresponding deprivation. While cases often involve both a wrongful act and unjust enrichment, constructive trusts may be imposed on either ground: where there is a wrongful act but no unjust enrichment and corresponding deprivation; or where there is an unconscionable unjust enrichment in the absence of a wrongful act, as in Pettkus v. Becker, supra. Within these two broad categories, there is room for the law of constructive trust to develop and for greater precision to be attained, as time and experience may dictate. 44 The process suggested is aptly summarized by McClean, supra, at pp. 169-70: The law [of constructive trust] may now be at a stage where it can distill from the specific examples a few general principles, and then, by analogy to the specific examples and within the ambit of the general principle, create new heads of liability. That, it is suggested, is not asking the courts to embark on too dangerous a task, or indeed on a novel task. In large measure it is the way that the common law has always developed.