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Program.fs
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Program.fs
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namespace Examples.TodoApp
open System
open Avalonia
open Avalonia.Animation
open Avalonia.Animation.Easings
open Avalonia.Controls.ApplicationLifetimes
open Avalonia.Controls.Primitives
open Avalonia.Controls.Shapes
open Avalonia.Input
open Avalonia.Markup.Xaml.Styling
open Avalonia.Media
open Avalonia.Media.Imaging
open Avalonia.Media.Immutable
open Avalonia.Platform
open Avalonia.Styling
open Avalonia.Themes.Fluent
open Avalonia.FuncUI.Hosts
open Avalonia.Controls
open Avalonia.Layout
open Avalonia.Threading
open Avalonia.FuncUI
open Avalonia.FuncUI.DSL
open Avalonia.FuncUI.Experimental
type TodoItem =
{ ItemId: Guid
Title: string
Done: bool }
[<RequireQualifiedAccess>]
module TodoItem =
let create (title: string) =
{ TodoItem.ItemId = Guid.NewGuid()
TodoItem.Title = title
TodoItem.Done = false }
let demoItems: TodoItem list =
[
create "Learn F#"
create "Play with Avalonia.FuncUI"
create "Write great apps 🚀"
]
[<RequireQualifiedAccess>]
module AppState =
let items: IWritable<TodoItem list> = new State<_>(TodoItem.demoItems)
let activeItemId: IWritable<Guid option> = new State<_>(None)
let hideDoneItems: IWritable<bool> = new State<_>(false)
[<RequireQualifiedAccess>]
module Icons =
(* https://icons8.com/icon/set/edit/sf-regular *)
let delete = lazy new Bitmap(AssetLoader.Open(Uri("avares://Examples.TodoApp/Assets/Icons/trash.png")))
let edit = lazy new Bitmap(AssetLoader.Open(Uri("avares://Examples.TodoApp/Assets/Icons/edit.png")))
let plus = lazy new Bitmap(AssetLoader.Open(Uri("avares://Examples.TodoApp/Assets/Icons/plus.png")))
let show = lazy new Bitmap(AssetLoader.Open(Uri("avares://Examples.TodoApp/Assets/Icons/show.png")))
let hide = lazy new Bitmap(AssetLoader.Open(Uri("avares://Examples.TodoApp/Assets/Icons/hide.png")))
let save = lazy new Bitmap(AssetLoader.Open(Uri("avares://Examples.TodoApp/Assets/Icons/save.png")))
[<RequireQualifiedAccess>]
module ControlThemes =
let inlineButton = lazy (
match Application.Current.TryFindResource "InlineButton" with
| true, theme -> theme :?> ControlTheme
| false, _ -> failwithf "Could not find theme 'InlineButton'"
)
module Views =
let listItemView (item: IWritable<TodoItem>) =
Component.create ($"item-%O{item.Current.ItemId}", fun ctx ->
let activeItemId = ctx.usePassed AppState.activeItemId
let item = ctx.usePassed item
let title = ctx.useState item.Current.Title
let animation = ctx.useStateLazy(fun () ->
Animation()
.WithDuration(0.3)
.WithEasing(CubicEaseIn())
.WithFillMode(FillMode.Forward)
.WithKeyFrames [
KeyFrame()
.WithCue(0)
.WithSetter(Component.OpacityProperty, 1.0)
.WithSetter(TranslateTransform.XProperty, 0.0)
KeyFrame()
.WithCue(1)
.WithSetter(Component.OpacityProperty, 0.0)
.WithSetter(TranslateTransform.XProperty, 500.0)
]
)
ctx.attrs [
Component.renderTransform (TranslateTransform())
]
let isActive = Some item.Current.ItemId = activeItemId.Current
if isActive then
DockPanel.create [
DockPanel.children [
Button.create [
Button.dock Dock.Right
Button.margin 5
Button.theme ControlThemes.inlineButton.Value
Button.content (
Image.create [
Image.width 24
Image.height 24
Image.source Icons.save.Value
]
)
Button.hotKey (KeyGesture Key.Enter)
Button.onClick (fun _ ->
item.Set { item.Current with Title = title.Current }
activeItemId.Set None
)
]
TextBox.create [
TextBox.dock Dock.Left
TextBox.text title.Current
TextBox.fontSize 18.0
TextBox.fontWeight FontWeight.Light
TextBox.onTextChanged (fun text -> title.Set text)
TextBox.verticalContentAlignment VerticalAlignment.Center
TextBox.classes [ "borderless" ]
]
]
]
else
DockPanel.create [
DockPanel.children [
StackPanel.create [
StackPanel.dock Dock.Right
StackPanel.margin 5
StackPanel.spacing 5
StackPanel.orientation Orientation.Horizontal
StackPanel.children [
Button.create [
Button.theme ControlThemes.inlineButton.Value
Button.content (
Image.create [
Image.width 24
Image.height 24
Image.source Icons.edit.Value
]
)
Button.onClick (fun _ -> activeItemId.Set (Some item.Current.ItemId))
]
Button.create [
Button.theme ControlThemes.inlineButton.Value
Button.content (
Image.create [
Image.width 24
Image.height 24
Image.source Icons.delete.Value
]
)
Button.onClick (fun args ->
if not (ctx.control.IsAnimating Component.OpacityProperty) then
ignore (
task {
do! animation.Current.RunAsync ctx.control
Dispatcher.UIThread.Post (fun _ ->
AppState.items.Current
|> List.filter (fun i -> i.ItemId <> item.Current.ItemId)
|> AppState.items.Set
)
return ()
}
)
)
]
]
]
CheckBox.create [
CheckBox.margin (Thickness (10, 0, 0, 0))
CheckBox.dock Dock.Left
CheckBox.isChecked item.Current.Done
CheckBox.horizontalAlignment HorizontalAlignment.Stretch
CheckBox.onChecked (fun _ -> item.Set { item.Current with Done = true })
CheckBox.onUnchecked (fun _ -> item.Set { item.Current with Done = false })
CheckBox.content (
TextBlock.create [
TextBlock.fontSize 18.0
TextBlock.fontWeight FontWeight.Light
TextBlock.text item.Current.Title
]
)
]
]
]
)
let listView () =
Component.create ("listView", fun ctx ->
let items = ctx.usePassed AppState.items
let hideDoneItems = ctx.usePassed AppState.hideDoneItems
StackPanel.create [
StackPanel.orientation Orientation.Vertical
StackPanel.verticalScrollBarVisibility ScrollBarVisibility.Visible
StackPanel.children [
let items =
items
|> State.sequenceBy (fun item -> item.ItemId)
|> List.filter (fun item ->
if hideDoneItems.Current then
not item.Current.Done
else
true
)
for item in items do
listItemView item
Rectangle.create [
Rectangle.fill Brushes.LightGray
Rectangle.height 1.0
Rectangle.horizontalAlignment HorizontalAlignment.Stretch
]
]
]
)
let toolbarView () =
Component(fun ctx ->
let hideDoneItems = ctx.usePassed AppState.hideDoneItems
let items = ctx.usePassed AppState.items
let doneItemsCount =
items.Current
|> List.filter (fun item -> item.Done)
|> List.length
DockPanel.create [
DockPanel.lastChildFill false
DockPanel.background (ImmutableSolidColorBrush(Colors.Black, 0.1))
DockPanel.children [
(* left *)
StackPanel.create [
StackPanel.dock Dock.Left
StackPanel.orientation Orientation.Horizontal
StackPanel.spacing 5
StackPanel.margin 5
StackPanel.children [
Button.create [
Button.theme ControlThemes.inlineButton.Value
Button.content (
StackPanel.create [
StackPanel.horizontalAlignment HorizontalAlignment.Center
StackPanel.orientation Orientation.Horizontal
StackPanel.spacing 5
StackPanel.children [
Image.create [
Image.width 24
Image.height 24
Image.source Icons.plus.Value
]
TextBlock.create [
TextBlock.verticalAlignment VerticalAlignment.Center
TextBlock.text "add item"
]
]
]
)
Button.onClick (fun _ ->
let newItem = TodoItem.create ""
AppState.items.Set (AppState.items.Current @ [newItem])
AppState.activeItemId.Set (Some newItem.ItemId)
)
]
]
]
(* right *)
StackPanel.create [
StackPanel.dock Dock.Right
StackPanel.orientation Orientation.Horizontal
StackPanel.spacing 5
StackPanel.margin 5
StackPanel.children [
Button.create [
Button.theme ControlThemes.inlineButton.Value
Button.content (
StackPanel.create [
StackPanel.horizontalAlignment HorizontalAlignment.Center
StackPanel.orientation Orientation.Horizontal
StackPanel.spacing 5
StackPanel.children [
Image.create [
Image.width 24
Image.height 24
Image.source (
if hideDoneItems.Current then
Icons.show.Value
else
Icons.hide.Value
)
]
TextBlock.create [
TextBlock.verticalAlignment VerticalAlignment.Center
TextBlock.text (
if hideDoneItems.Current then
$"show %i{doneItemsCount} done"
else
$"hide %i{doneItemsCount} done"
)
]
]
]
)
Button.onClick (fun _ ->
hideDoneItems.Set (not hideDoneItems.Current)
)
]
]
]
]
]
)
let mainView () =
Component(fun ctx ->
DockPanel.create [
DockPanel.children [
(* toolbar *)
ContentControl.create [
ContentControl.dock Dock.Top
ContentControl.content (toolbarView())
]
(* item list *)
ScrollViewer.create [
ScrollViewer.dock Dock.Top
ScrollViewer.content (listView())
]
]
]
)
type MainWindow() as this =
inherit HostWindow()
do
base.Title <- "TODO App"
base.Width <- 400.0
base.Height <- 400.0
this.Content <- Views.mainView ()
type App() =
inherit Application()
override this.Initialize() =
this.Styles.Add (FluentTheme())
this.Styles.Add (StyleInclude(baseUri = null, Source = Uri("avares://Examples.TodoApp/Styles.axaml")))
this.RequestedThemeVariant <- ThemeVariant.Light
this.Resources.MergedDictionaries.Add (
ResourceInclude(baseUri = null, Source = Uri("avares://Examples.TodoApp/Resources.axaml"))
)
override this.OnFrameworkInitializationCompleted() =
match this.ApplicationLifetime with
| :? IClassicDesktopStyleApplicationLifetime as desktopLifetime ->
desktopLifetime.MainWindow <- MainWindow()
| _ -> ()
[<RequireQualifiedAccess>]
module Program =
[<EntryPoint>]
let main(args: string[]) =
AppBuilder
.Configure<App>()
.UsePlatformDetect()
.UseSkia()
.StartWithClassicDesktopLifetime(args)