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.NET Forum / Windows Forms / WinForm General / August 2007Best way of designing Win Forms Call backs
I have a .Net 2 WinForm app which allow multi-windows to co-exist (in task bar). They are all spawned from a main-form. (i.e., Form A can start Forms B,C,D,E) 2 questions about call-backs Question 1) Forms B,C,D contains DataGridView, which I need to make sortable on multiple columns/fields (which is not a built in .Net functionality, I believe). I need a new Modal dialog to be spawned from Forms B,C,D to allow users to select sort fields and orders and then on closing the dialog, the gridView in Forms B,C,D need to be refreshed with the new sort order selected in the modal dialog. What is the best way (of doing call-backs) from modal-Dialog X back to Forms B,C,D? Should I have 1) "Abstract" class MyDataGridForm with an abstract method called ReSortGridView() 2) Have Forms B, C, D inherit from this abstract Form MyDataGridForm? 3) Define the Modal Sort selection dialog's constructor as taking in MyDataGridForm as a parameter? Any better ways of doing this? Question 2) Ideally, it would be nice that for every new Form spawned off, a "Window" navigation menuitem is added. So each form would need a "handle" on to all forms spawned. What is the best way of doing this? First I would post your question in two different post. I can only give advice to the first question. Use should use a Behavioral Pattern like Mediator Pattern. Create a global mediator object (FormLeader) that has events. When a Form A starts the childrens is register it with the FormLeader object so the children can talk and listen for events. When someone clicks on data grid in a child, it notify the FormLeader of that action. The FormLeader takes care of creating the ReOrder Dialog. When the ReOrder dialog is closed the FormLeader raise an event to notify anyone that is listening that a re-order has occured. <http://en.wikipedia.org/wiki/Mediator_pattern> <http://www.dofactory.com/Patterns/PatternMediator.aspx> I hope this put you on the right track. > I have a .Net 2 WinForm app which allow multi-windows to co-exist (in task > bar). They are all spawned from a main-form. [quoted text clipped - 25 lines] > "Window" navigation menuitem is added. So each form would need a "handle" on > to all forms spawned. What is the best way of doing this? > I can only give advice to the first question. Use should use a > Behavioral Pattern like Mediator Pattern. Create a global mediator [quoted text clipped - 5 lines] > closed the FormLeader raise an event to notify anyone that is > listening that a re-order has occured. OMG!!! I need a master degree to understand this. Hold on!!! I have a master degree in computing!!! What's wrong with having somthing simple? Property or parameter will do. MH > 3) Define the Modal Sort selection dialog's constructor as taking in > MyDataGridForm as a parameter? YES. KEEP IT SIMPLE!!!! Even better you can use the grid as a parameter (or property). > Question 2) Ideally, it would be nice that for every new Form spawned > off, a "Window" navigation menuitem is added. So each form would > need a "handle" on to all forms spawned. What is the best way of > doing this? ArrayList MH Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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