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Make a TodoListViewModel and factor out logic
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| // | ||
| // Created by Christopher Trott on 12/9/15. | ||
| // Copyright © 2015 twocentstudios. All rights reserved. | ||
| // | ||
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| import Foundation | ||
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| protocol ListViewModelable { | ||
| typealias ViewModelType | ||
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| var viewModels: [ViewModelType] { get } | ||
| } | ||
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| extension ListViewModelable { | ||
| func numberOfRowsInSection(section: Int) -> Int { | ||
| if (section > 0) { return 0 } | ||
| return viewModels.count | ||
| } | ||
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| func viewModelAtIndexPath(indexPath: NSIndexPath) -> ViewModelType { | ||
| precondition(indexPath.section == 0) | ||
| return viewModels[indexPath.row] | ||
| } | ||
| } | ||
|
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| enum GroupChange { | ||
| case Reload | ||
| case NoOp | ||
| } | ||
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| enum SingleChange { | ||
| case Insert(NSIndexPath) | ||
| case Delete(NSIndexPath) | ||
| case Reload(NSIndexPath) | ||
| case NoOp | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| // | ||
| // Created by Christopher Trott on 12/9/15. | ||
| // Copyright © 2015 twocentstudios. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
|
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| struct TodoListViewModel: ListViewModelable { | ||
| var viewModels = [TodoViewModel]() | ||
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| mutating func incorporateTodoViewModels(newViewModels: [TodoViewModel]) -> GroupChange { | ||
| if (viewModels == newViewModels) { return .NoOp } | ||
| viewModels = newViewModels | ||
| return .Reload | ||
| } | ||
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| mutating func incorporateTodoViewModel(newViewModel: TodoViewModel) -> SingleChange { | ||
| if let index = viewModels.indexOf(newViewModel) { | ||
| if (newViewModel.deleted) { | ||
| // delete | ||
| viewModels.removeAtIndex(index) | ||
| return .Delete(NSIndexPath(forRow: index, inSection: 0)) | ||
| } else { | ||
| // replace | ||
| viewModels[index] = newViewModel | ||
| return .Reload(NSIndexPath(forRow: index, inSection: 0)) | ||
| } | ||
| } else { | ||
| viewModels.insert(newViewModel, atIndex: 0) | ||
| return .Insert(NSIndexPath(forRow: 0, inSection: 0)) | ||
| } | ||
| } | ||
| } |