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Merge pull request #1 from ReedCopsey/master
Simplified and clarified example
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,66 +1,8 @@ | ||
| namespace ViewModels | ||
| namespace Views | ||
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| open System | ||
| open System.Windows | ||
| open FSharp.ViewModule | ||
| open FsXaml | ||
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| type MainView = XAML<"MainWindow.xaml", true> | ||
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| type Score = { | ||
| ScoreA: int | ||
| ScoreB: int | ||
| } with | ||
| static member zero = {ScoreA = 0; ScoreB = 0} | ||
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| type ScoringEvent = IncA | DecA | IncB | DecB | New | ||
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| type Controller = Score -> ScoringEvent -> Score | ||
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| type MainViewModel(controller : Controller) as self = | ||
| inherit EventViewModelBase<ScoringEvent>() | ||
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| let mutable score = Score.zero | ||
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| let scoreA = self.Factory.Backing(<@ self.ScoreA @>, "00") | ||
| let scoreB = self.Factory.Backing(<@ self.ScoreB @>, "00") | ||
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| let updateView () = | ||
| self.ScoreA <- score.ScoreA.ToString("D2") | ||
| self.ScoreB <- score.ScoreB.ToString("D2") | ||
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| let eventHandler ev = | ||
| score <- controller score ev | ||
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| do | ||
| self.EventStream | ||
| |> Observable.subscribe (eventHandler >> updateView) | ||
| |> ignore | ||
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| member self.IncA = self.Factory.EventValueCommand(IncA) | ||
| member self.DecA = self.Factory.EventValueCommand(DecA) | ||
| member self.IncB = self.Factory.EventValueCommand(IncB) | ||
| member self.DecB = self.Factory.EventValueCommand(DecB) | ||
| member self.NewGame = self.Factory.EventValueCommand(New) | ||
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| member self.ScoreA with get() = scoreA.Value | ||
| and set value = scoreA.Value <- value | ||
| member self.ScoreB with get() = scoreB.Value | ||
| and set value = scoreB.Value <- value | ||
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| module Handling = | ||
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| let controller score ev = | ||
| match ev with | ||
| | IncA -> {score with ScoreA = score.ScoreA + 1} | ||
| | DecA -> {score with ScoreA = score.ScoreA - 1} | ||
| | IncB -> {score with ScoreB = score.ScoreB + 1} | ||
| | DecB -> {score with ScoreB = score.ScoreB - 1} | ||
| | New -> Score.zero | ||
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| type MainView = XAML<"MainWindow.xaml"> | ||
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| type CompositionRoot() = | ||
| member x.ViewModel with get() = MainViewModel(Handling.controller) | ||
| member __.ViewModel = ViewModel.MainViewModel(ScoreModel.Score.adjustScore) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| namespace ScoreModel | ||
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| [<AutoOpen>] | ||
| module ScoreTypes = | ||
| type Score = { ScoreA: int ; ScoreB: int } | ||
| type ScoringEvent = IncA | DecA | IncB | DecB | New | ||
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| module Score = | ||
| let zero = {ScoreA = 0; ScoreB = 0} | ||
| let adjustScore score event = | ||
| match event with | ||
| | IncA -> {score with ScoreA = score.ScoreA + 1} | ||
| | DecA -> {score with ScoreA = max (score.ScoreA - 1) 0} | ||
| | IncB -> {score with ScoreB = score.ScoreB + 1} | ||
| | DecB -> {score with ScoreB = max (score.ScoreB - 1) 0} | ||
| | New -> zero |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| namespace ViewModel | ||
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| open ScoreModel | ||
| open FSharp.ViewModule | ||
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| type MainViewModel(controller : Score -> ScoringEvent -> Score) as self = | ||
| inherit EventViewModelBase<ScoringEvent>() | ||
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| let score = self.Factory.Backing(<@ self.Score @>, Score.zero) | ||
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| let eventHandler ev = score.Value <- controller score.Value ev | ||
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| do | ||
| self.EventStream | ||
| |> Observable.add eventHandler | ||
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| member this.IncA = this.Factory.EventValueCommand(IncA) | ||
| member this.DecA = this.Factory.EventValueCommandChecked(DecA, (fun _ -> this.Score.ScoreA > 0), [ <@@ this.Score @@> ]) | ||
| member this.IncB = this.Factory.EventValueCommand(IncB) | ||
| member this.DecB = this.Factory.EventValueCommandChecked(DecB, (fun _ -> this.Score.ScoreB > 0), [ <@@ this.Score @@> ]) | ||
| member this.NewGame = this.Factory.EventValueCommand(New) | ||
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| member __.Score = score.Value |
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