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michaelstonismichaelstonis
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xamarin essentials example
1 parent 5467031 commit e8f76fa

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3 files changed

+152
-1
lines changed

3 files changed

+152
-1
lines changed

‎ReactiveExtensionExamples/Pages/NavigationContainerPage.cs

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Original file line numberDiff line numberDiff line change
@@ -77,6 +77,9 @@ public NavigationContainerPage ()
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case NavigationPages.RxUiLogin:
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selectedPage = new Pages.ReactiveUiLogin();
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break;
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case NavigationPages.RxUiXamarinEssentials:
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selectedPage = new Pages.ReactiveUiEssentials();
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break;
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default:
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break;
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}
@@ -108,7 +111,8 @@ enum NavigationPages {
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RxUiLogin,
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StandardSearch,
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SearchWithReactiveExtensions,
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RxUiSearch
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RxUiSearch,
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RxUiXamarinEssentials
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}
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class NavListPage : ContentPage {
@@ -226,6 +230,12 @@ public NavListPage () {
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Command = new Command(() => selectedNavigation.OnNext(NavigationPages.RxUiLogin)),
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};
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navigationContainer.Children.Add(rxuiLogin);
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var rxuiEssentials = new Button {
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Text = "RxUI - Xamarin Essentials",
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Command = new Command(() => selectedNavigation.OnNext(NavigationPages.RxUiXamarinEssentials)),
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};
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navigationContainer.Children.Add(rxuiEssentials);
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var reactiveLogo = new Image {
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Source = "reactive_logo.png",

‎ReactiveExtensionExamples/Pages/ReactiveUiEssentials.cs

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,60 @@
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using System;
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using System.Reactive.Disposables;
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using System.Reactive.Linq;
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using ReactiveUI;
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using Xamarin.Forms;
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using System.Threading.Tasks;
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using ReactiveUI.XamForms;
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namespace ReactiveExtensionExamples.Pages
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{
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public class ReactiveUiEssentials : ReactiveContentPage<ViewModels.XamarinEssentials>
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{
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BoxView colorDisplay;
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Slider x, y, z;
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public ReactiveUiEssentials ()
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{
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ViewModel = new ReactiveExtensionExamples.ViewModels.XamarinEssentials ();
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Title = "RxUI - Xamarin Essentials";
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Content = new StackLayout {
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Padding = new Thickness(40d),
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Children = {
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(colorDisplay = new BoxView{ HeightRequest = 250 }),
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new Label{ Text = "X"},
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(x = new Slider(-1, 1, 0){ InputTransparent = true }),
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new Label{ Text = "Y"},
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(y = new Slider(-1, 1, 0){ InputTransparent = true }),
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new Label{ Text = "Z"},
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(z = new Slider(-1, 1, 0){ InputTransparent = true })
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}
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};
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this.WhenActivated((CompositeDisposable disposables) =>
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{
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this.OneWayBind (ViewModel, vm => vm.X, c => c.x.Value)
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.DisposeWith(disposables);
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this.OneWayBind (ViewModel, vm => vm.Y, c => c.y.Value)
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.DisposeWith(disposables);
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this.OneWayBind (ViewModel, vm => vm.Z, c => c.z.Value)
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.DisposeWith(disposables);
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this.WhenAnyValue (x => x.ViewModel.Color)
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.ObserveOn (RxApp.MainThreadScheduler)
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.Select (color => Color.FromRgba (color.R, color.G, color.B, color.A))
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.BindTo (this, x => x.colorDisplay.BackgroundColor)
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.DisposeWith(disposables);
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});
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}
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}
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}
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‎ReactiveExtensionExamples/ViewModels/XamarinEssentials.cs

Lines changed: 81 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,81 @@
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using System.Linq;
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using ReactiveUI;
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using System.Reactive.Disposables;
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using System.Reactive.Linq;
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using Xamarin.Essentials;
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using System.Numerics;
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using System;
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using System.Drawing;
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namespace ReactiveExtensionExamples.ViewModels
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{
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public class XamarinEssentials : ViewModelBase
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{
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ObservableAsPropertyHelper<double> _x;
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public double X => _x.Value;
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ObservableAsPropertyHelper<double> _y;
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public double Y => _y.Value;
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ObservableAsPropertyHelper<double> _z;
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public double Z => _z.Value;
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ObservableAsPropertyHelper<Color> _color;
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public Color Color => _color?.Value ?? default(Color);
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public XamarinEssentials ()
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{
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this.WhenActivated(
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(CompositeDisposable disposables) =>
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{
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var gyroscopeChanged =
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Observable
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.FromEvent<AccelerometerChangedEventHandler, AccelerometerChangedEventArgs>(
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x => Accelerometer.ReadingChanged += x,
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x => Accelerometer.ReadingChanged -= x)
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.SubscribeOn(RxApp.TaskpoolScheduler)
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.Select(x => x.Reading.Acceleration)
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.StartWith(Vector3.Zero)
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.Do(x =>
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{
41+
if (!Accelerometer.IsMonitoring)
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Accelerometer.Start(SensorSpeed.Ui);
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})
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.Finally(() => {
45+
Accelerometer.Stop();
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})
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.Throttle(TimeSpan.FromMilliseconds(20))
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.Do(x => System.Diagnostics.Debug.WriteLine($"ACC: {x}"))
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.Publish()
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.RefCount();
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gyroscopeChanged
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.Select(x => (double)x.X)
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.ToProperty(this, x => x.X, out _x)
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.DisposeWith(disposables);
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gyroscopeChanged
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.Select(x => (double)x.Y)
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.ToProperty(this, x => x.Y, out _y)
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.DisposeWith(disposables);
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gyroscopeChanged
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.Select(x => (double)x.Z)
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.ToProperty(this, x => x.Z, out _z)
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.DisposeWith(disposables);
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gyroscopeChanged
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.Select(x => {
69+
var r = (int)Math.Min(255, Math.Abs(x.X * 255));
70+
var g = (int)Math.Min(255, Math.Abs(x.Y * 255));
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var b = (int)Math.Min(255, Math.Abs(x.Z * 255));
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return Color.FromArgb(r, g, b);
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})
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.ToProperty(this, x => x.Color, out _color)
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.DisposeWith(disposables);
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});
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}
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}
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}
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