C++ Programming :: help on document/view design.


	help on document/view design. Dear All, I am learning the document/view design. The document stores data and provides GUI-independent operations upon it; while the views display and manipulate the data. Assume I have several objects to display in the view. And I can hide some objects in the view. My question is that: May I need to store the hide status of an object in the document? If I store them, when on updating the view by the document, I can still hide those that are asked to hide before. But accoding my understanding, the hide status is GUI-dependent, and it will spoil the original intention of separation of document and view. Anybody can give me some suggestion? Thanks a lot! Shuisheng - Hide quoted text - shuisheng wrote: > Dear All, > I am learning the document/view design. The document stores data and > provides GUI-independent operations upon it; while the views display > and manipulate the data. > Assume I have several objects to display in the view. And I can hide > some objects in the view. > My question is that: May I need to store the hide status of an object > in the document? If I store them, when on updating the view by the > document, I can still hide those that are asked to hide before. But > accoding my understanding, the hide status is GUI-dependent, and it > will spoil the original intention of separation of document and view. > Anybody can give me some suggestion? It's very difficult to understand you but if I get your meaning you may be served by using several views governed by a mediator. On Feb 16, 2:32 pm, "shuisheng" <shuishen@yahoo.com> wrote: > Dear All, > I am learning the document/view design. The document stores data and > provides GUI-independent operations upon it; while the views display > and manipulate the data. > Assume I have several objects to display in the view. And I can hide > some objects in the view. > My question is that: May I need to store the hide status of an object > in the document? I don't see any need to do this. All the GUI toolkits I've worked with support some sort of hide() operation for widgets. If I store them, when on updating the view by the > document, I can still hide those that are asked to hide before. But > accoding my understanding, the hide status is GUI-dependent, and it > will spoil the original intention of separation of document and view. It sure would violate the document/view separation to store view information within the document. > Anybody can give me some suggestion? > Thanks a lot! > Shuisheng HTH, Paul Davis