init a list control with data
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From: Christian Buhtz on 24 Dec 2007 06:01 Ok an example for a backup-software: There is a class "Project" that represent the data layer and owns some backup-tasks (copy, move, archive, blabla). There is a class "TaskListCtrl" that represent the presentation layer and should display all tasks from "Project" in a list. Do realize this I need a class in the appliaction layer between them. It is called "ProjectApp". The question know is how can I fill the list-control "TaskListCtrl" the most smartest and OO way? Should "ProjectApp" get the ctrl-object and fill it like this? ProjectApp::FillListCtrl (TaskListCtrl* pCtrl) { [ iterate over all tasks in "Project" ] pCtrl->Add(current_task->Name()); } I am not sure why, but I don't like this solution in my stomake. ;) I think the application layer should touch the presentation layer directly like this (pCtrl->Add()). But of course the presentation layer can not iterate througe all taks on "Project".
From: Daniel T. on 24 Dec 2007 09:07
In article <5t9hutF1ct759U1(a)mid.individual.net>, Christian Buhtz <exsudat(a)gmx.de> wrote: > Ok an example for a backup-software: > There is a class "Project" that represent the data layer and owns some > backup-tasks (copy, move, archive, blabla). > There is a class "TaskListCtrl" that represent the presentation layer > and should display all tasks from "Project" in a list. > > Do realize this I need a class in the appliaction layer between them. It > is called "ProjectApp". > > The question know is how can I fill the list-control "TaskListCtrl" the > most smartest and OO way? > > Should "ProjectApp" get the ctrl-object and fill it like this? > ProjectApp::FillListCtrl (TaskListCtrl* pCtrl) > { > [ iterate over all tasks in "Project" ] > pCtrl->Add(current_task->Name()); > } > > > I am not sure why, but I don't like this solution in my stomake. ;) > I think the application layer should touch the presentation layer > directly like this (pCtrl->Add()). > But of course the presentation layer can not iterate througe all taks on > "Project". Just to make sure I understand you... [Client]--->[ProjectApp]<>--->*[Task] | | +--------------+-------->[TaskListCtrl] So ProjectApp has a list of Task objects, and some client is requesting that it pass a list of Task names to a TaskListCtrl that the client provides. Is that correct? (I'm also assuming that Task::Name() returns a value object or a non-modifiable reference object. Other than being curious who this client is, I don't see anything inherently wrong with the above. |