Revert (Undo) implementation in GWT
问题 We are trying to build a GUI framework using GWT. We are finding it hard to implement the cancel functionality in the framework. Required feature is this: We have CRUD screens which have pop-ups, grids and so on. When the user changes anything in the GUI and then clicks on cancel() he should be given a notification message saying that something has changed. Approach that we have tried: Currently we are trying to keep a hashmap of key vs value of the entire pojo object and trying to compare it