in respond to the issue 16

#16

samples/Calculator/Calculator.fsproj

@@ -13,6 +13,8 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <TargetFSharpCoreVersion>4.3.1.0</TargetFSharpCoreVersion>
     <Name>Calculator</Name>
+    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+    <RestorePackages>true</RestorePackages>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -85,6 +87,13 @@
     <Reference Include="System.Xml.Linq" />
     <Reference Include="WindowsBase" />
   </ItemGroup>
+  <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
+  </Target>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">

samples/Calculator/Program.fs

@@ -138,50 +138,49 @@ type CalculatorView() as this =
             @>, 
             updateSourceTrigger = UpdateSourceTrigger.PropertyChanged)
 
-type CalculatorController(?wolframAlphaService: string -> string -> Async<WolframAlpha.Response>) = 
+type CalculatorController(?wolframAlphaService: string -> string -> Async<WolframAlpha.Response>) =
+    inherit Controller<CalculatorEvents, CalculatorModel>()
 
     let wolframAlphaService = defaultArg wolframAlphaService WolframAlpha.instance
 
-    interface IController<CalculatorEvents, CalculatorModel> with
-
-        member this.InitModel model = 
-            model.WolframalphaResponse <- Empty
-            let appKey = ConfigurationManager.AppSettings.["WolframalphaAppId"]
-            if appKey <> null 
-            then model.WolframalphaAppId <- appKey
-
-        member this.Dispatcher = function
-            | Add -> Sync this.Add
-            | Subtract -> Sync this.Subtract
-            | Multiply -> Sync this.Multiply
-            | Divide -> Sync this.Divide
-            | Clear -> Sync this.Clear
-            | ArgChanging(text, cancel) -> Sync(this.DiscardInvalidInput text cancel)
-            | AskWolframalpha -> Async this.AskWolframalpha 
-            | CancelAskWolframalphaRequest -> Sync <| fun _ -> Async.CancelDefaultToken()
-
-    member this.Add(model: CalculatorModel) = 
+    override this.InitModel model = 
+        model.WolframalphaResponse <- Empty
+        let appKey = ConfigurationManager.AppSettings.["WolframalphaAppId"]
+        if appKey <> null 
+        then model.WolframalphaAppId <- appKey
+
+    override this.Dispatcher = function
+        | Add -> Sync this.Add
+        | Subtract -> Sync this.Subtract
+        | Multiply -> Sync this.Multiply
+        | Divide -> Sync this.Divide
+        | Clear -> Sync this.Clear
+        | ArgChanging(text, cancel) -> Sync(this.DiscardInvalidInput text cancel)
+        | AskWolframalpha -> Async this.AskWolframalpha 
+        | CancelAskWolframalphaRequest -> Sync <| fun _ -> Async.CancelDefaultToken()
+
+    member this.Add model = 
         if model.Y < 0. 
         then model |> Validation.setError <@ fun m -> m.Y @> "Must be positive number."
         else model.Result <- model.X + model.Y
 
-    member this.Subtract(model: CalculatorModel) = 
+    member this.Subtract model = 
         if model.Y < 0. 
         then model |> Validation.setError <@ fun  m -> m.Y @> "Must be positive number."
         else model.Result <- model.X - model.Y
 
-    member this.Multiply(model: CalculatorModel) = 
+    member this.Multiply model = 
         model.Result <- model.X * model.Y
 
-    member this.Divide(model: CalculatorModel) = 
+    member this.Divide model = 
         model.Result <- model.X / model.Y
 
-    member this.Clear(model: CalculatorModel) = 
+    member this.Clear model = 
         model.X <- 0.
         model.Y <- 0.
         model.Result <- 0.
 
-    member this.DiscardInvalidInput (newValue: string) cancel (model: CalculatorModel) = 
+    member this.DiscardInvalidInput (newValue: string) cancel model = 
         let textToCheck = if newValue.EndsWith(".") then newValue + "0" else newValue
         match Double.TryParse textToCheck with 
         | false, _  ->  cancel()

src/Controller.fs

@@ -1,23 +1,2 @@
 namespace FSharp.Desktop.UI
 
-[<AbstractClass>]
-type Controller<'Event, 'Model>() =
-
-    interface IController<'Event, 'Model> with
-        member this.InitModel model = this.InitModel model
-        member this.Dispatcher = this.Dispatcher
-
-    abstract InitModel : 'Model -> unit
-    abstract Dispatcher : ('Event -> EventHandler<'Model>)
-
-    static member Create callback = {
-        new IController<'Event, 'Model> with
-            member this.InitModel _ = ()
-            member this.Dispatcher = callback
-    } 
-
-    static member Create callback = {
-        new IController<'Event, 'Model> with
-            member this.InitModel _ = ()
-            member this.Dispatcher = fun event -> Sync(callback event)
-    } 

src/Mvc.fs

@@ -8,14 +8,21 @@ open System.Reactive
 open System.Reactive.Concurrency
 open System.Reactive.Linq
 
+open System.Windows
+
+type IDialogService = 
+    abstract MessageBox: text: string * ?caption: string * ?button: MessageBoxButton * ?icon: MessageBoxImage * ?defaultResult: MessageBoxResult * ?options: MessageBoxOptions * ?owner: Window -> MessageBoxResult
+    //more specialized members can be defined like: Error, Warning, Confrim
+
 type IPartialView<'Event, 'Model> = 
-    abstract Events : IObservable<'Event> with get
-    abstract SetBindings : 'Model -> unit
+    abstract Events: IObservable<'Event> with get
+    abstract SetBindings: 'Model -> unit
+    abstract DialogService: IDialogService with get
 
 type IView<'Event, 'Model> =
     inherit IPartialView<'Event, 'Model>
-    abstract ShowDialog : unit -> bool
-    abstract Show : unit -> Async<unit>
+    abstract ShowDialog: unit -> bool
+    abstract Show: unit -> Async<unit>
 
 type EventHandler<'Model> = 
     | Sync of ('Model -> unit)
@@ -24,6 +31,36 @@ type EventHandler<'Model> =
 type IController<'Event, 'Model> =
     abstract InitModel : 'Model -> unit
     abstract Dispatcher : ('Event -> EventHandler<'Model>)
+    abstract DialogService: IDialogService with set
+
+[<AbstractClass>]
+type Controller<'Event, 'Model>() =
+
+    let mutable dialogService = {
+        new IDialogService with 
+            member __.MessageBox( text, _, _, _, _, _, _) = undefined //or maybe better to use Debug.WriteLine or empty body as deafult
+    }
+
+    interface IController<'Event, 'Model> with
+        member this.InitModel model = this.InitModel model
+        member this.Dispatcher = this.Dispatcher
+        member __.DialogService with set value = dialogService <- value
+
+    abstract InitModel : 'Model -> unit
+    abstract Dispatcher : ('Event -> EventHandler<'Model>)
+    member __.DialogService = dialogService
+
+    static member Create callback = {
+        new Controller<'Event, 'Model>() with
+            member this.InitModel _ = ()
+            member this.Dispatcher = callback
+    } 
+
+    static member Create callback = {
+        new Controller<'Event, 'Model>() with
+            member this.InitModel _ = ()
+            member this.Dispatcher = fun event -> Sync(callback event)
+    } 
 
 [<Sealed>]
 type Mvc<'Event, 'Model when 'Model :> INotifyPropertyChanged>(model : 'Model, view : IView<'Event, 'Model>, controller : IController<'Event, 'Model>) =
@@ -72,12 +109,13 @@ type Mvc<'Event, 'Model when 'Model :> INotifyPropertyChanged>(model : 'Model, v
                     member __.SetBindings model =
                         view.SetBindings model  
                         model |> childModelSelector |> childView.SetBindings
+                    member __.DialogService = view.DialogService
                     member __.Show() = view.Show()
                     member __.ShowDialog() = view.ShowDialog()
         }
 
         let compositeController = { 
-            new IController<_, _> with
+            new Controller<_, _>() with
                 member __.InitModel model = 
                     controller.InitModel model
                     model |> childModelSelector |> childController.InitModel
@@ -99,6 +137,7 @@ type Mvc<'Event, 'Model when 'Model :> INotifyPropertyChanged>(model : 'Model, v
             new IPartialView<_, _> with
                 member __.Events = events
                 member __.SetBindings _ = () 
+                member __.DialogService = view.DialogService
         }
         this.Compose(childController, childView, id)
 

src/View.fs

@@ -16,6 +16,26 @@ type PartialView<'Event, 'Model, 'Element when 'Element :> FrameworkElement>(roo
         member this.SetBindings model = 
             root.DataContext <- model
             this.SetBindings model
+        member __.DialogService = {
+            new IDialogService with
+                member __.MessageBox( text, caption, button, icon, defaultResult, options, owner) = 
+                    match caption, button, icon, defaultResult, options, owner with
+                    | None, None, None, None, None, None -> MessageBox.Show text
+                    | Some caption, None, None, None, None, None  -> MessageBox.Show(text, caption)
+                    | Some caption, Some button, None, None, None, None  -> MessageBox.Show(text, caption, button)
+                    | Some caption, Some button, Some icon, None, None, None  -> MessageBox.Show(text, caption, button, icon)
+                    | Some caption, Some button, Some icon, Some defaultResult, None, None  -> MessageBox.Show(text, caption, button, icon, defaultResult)
+                    | Some caption, Some button, Some icon, Some defaultResult, Some options, None  -> MessageBox.Show(text, caption, button, icon, defaultResult, options)
+                    //Owner
+                    | None, None, None, None, None, Some owner -> MessageBox.Show(owner, text)
+                    | Some caption, None, None, None, None, Some owner -> MessageBox.Show(owner, text, caption)
+                    | Some caption, Some button, None, None, None, Some owner -> MessageBox.Show(owner, text, caption, button)
+                    | Some caption, Some button, Some icon, None, None, Some owner -> MessageBox.Show(owner, text, caption, button, icon)
+                    | Some caption, Some button, Some icon, Some defaultResult, None, Some owner -> MessageBox.Show(owner, text, caption, button, icon, defaultResult)
+                    | Some caption, Some button, Some icon, Some defaultResult, Some options, Some owner -> MessageBox.Show(owner, text, caption, button, icon, defaultResult, options)
+
+                    | _ as xs -> invalidOp "Unexpected parameters: %A" xs
+        }
 
     abstract EventStreams : IObservable<'Event> list
     abstract SetBindings : 'Model -> unit