everything mostly works

Pomotimer/App.xaml

@@ -3,6 +3,7 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="using:Pomotimer">
+
     <Application.Resources>
         <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
     </Application.Resources>

Pomotimer/MainPage.xaml

@@ -3,12 +3,21 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:controls="using:Microsoft.UI.Xaml.Controls"
+    xmlns:converters="using:Microsoft.Toolkit.Uwp.UI.Converters"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:local="using:Pomotimer"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
     mc:Ignorable="d">
 
+    <Page.Resources>
+        <converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
+        <converters:BoolToObjectConverter
+            x:Key="BoolToWorkRestConverter"
+            FalseValue="Work"
+            TrueValue="Rest" />
+    </Page.Resources>
+
     <Grid>
         <Grid.ColumnDefinitions>
             <ColumnDefinition Width="*" />
@@ -18,16 +27,44 @@
             <RowDefinition Height="*" />
         </Grid.RowDefinitions>
         <Grid Grid.Row="0" Grid.Column="0">
-            <RichTextBlock HorizontalAlignment="Center" VerticalAlignment="Center">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="2*" />
+                <RowDefinition Height="*" />
+            </Grid.RowDefinitions>
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*" />
+            </Grid.ColumnDefinitions>
+            <RichTextBlock
+                Grid.Row="0"
+                Grid.Column="0"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Bottom">
                 <Paragraph>
-                    <Run FontSize="60" FontWeight="Bold">
+                    <Run
-                        40
+                        x:Name="MinutesText"
-                    </Run>
+                        FontSize="60"
-                    <Run FontSize="30" FontWeight="SemiBold">
+                        FontWeight="Bold"
-                        :00
+                        Text="{x:Bind runningState.MinutesLeft, Mode=OneWay}" />
-                    </Run>
+                    <Run
+                        x:Name="Separator"
+                        FontSize="30"
+                        FontWeight="SemiBold"
+                        Text=":" />
+                    <Run
+                        x:Name="SecondsText"
+                        FontSize="30"
+                        FontWeight="SemiBold"
+                        Text="{x:Bind runningState.SecondsLeft, Mode=OneWay}" />
                 </Paragraph>
             </RichTextBlock>
+            <TextBlock
+                Grid.Row="1"
+                Grid.Column="0"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Top"
+                FontSize="30"
+                FontWeight="Light"
+                Text="{x:Bind runningState.OnRest, Converter={StaticResource BoolToWorkRestConverter}, Mode=OneWay}" />
         </Grid>
         <Grid Grid.Row="0" Grid.Column="1">
             <Grid>
@@ -49,7 +86,7 @@
                     Minimum="0"
                     SmallChange="5"
                     SpinButtonPlacementMode="Inline"
-                    Value="40" />
+                    Value="{x:Bind WorkMinutes, Mode=TwoWay}" />
                 <controls:NumberBox
                     x:Name="RestMinutesInput"
                     Grid.Row="1"
@@ -61,7 +98,7 @@
                     Minimum="0"
                     SmallChange="1"
                     SpinButtonPlacementMode="Inline"
-                    Value="5" />
+                    Value="{x:Bind RestMinutes, Mode=TwoWay}" />
             </Grid>
         </Grid>
     </Grid>
@@ -71,20 +108,38 @@
             DefaultLabelPosition="Right"
             IsOpen="True">
             <AppBarButton
+                x:Name="PlayButton"
+                Click="PlayButton_Click"
                 Icon="Play"
                 Label="Start"
-                Visibility="Visible" />
+                Visibility="{x:Bind runningState.IsRunning, Converter={StaticResource BoolToVisibilityConverter}, Mode=OneWay, ConverterParameter=True}" />
             <AppBarButton
+                x:Name="PauseButton"
+                Click="PauseButton_Click"
                 Icon="Pause"
                 Label="Pause"
-                Visibility="Collapsed" />
+                Visibility="{x:Bind runningState.IsRunning, Converter={StaticResource BoolToVisibilityConverter}, Mode=OneWay}" />
             <AppBarButton
+                x:Name="ResetButton"
+                Click="ResetButton_Click"
                 Icon="Redo"
                 Label="Reset"
-                Visibility="Collapsed" />
+                Visibility="Visible" />
-            <AppBarButton Icon="Add" Label="+1min" />
+            <AppBarButton
-            <AppBarButton Icon="Add" Label="+5min" />
+                x:Name="Plus1Button"
-            <AppBarButton Icon="Add" Label="+10min" />
+                Click="Plus1Button_Click"
+                Icon="Add"
+                Label="+1min" />
+            <AppBarButton
+                x:Name="Plus5Button"
+                Click="Plus5Button_Click"
+                Icon="Add"
+                Label="+5min" />
+            <AppBarButton
+                x:Name="Plus10Button"
+                Click="Plus10Button_Click"
+                Icon="Add"
+                Label="+10min" />
         </CommandBar>
     </Page.BottomAppBar>
 </Page>

Pomotimer/MainPage.xaml.cs

@@ -8,11 +8,13 @@ using Windows.Foundation.Collections;
 using Windows.UI.ViewManagement;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
+using controls = Microsoft.UI.Xaml.Controls;
 using Windows.UI.Xaml.Controls.Primitives;
 using Windows.UI.Xaml.Data;
 using Windows.UI.Xaml.Input;
 using Windows.UI.Xaml.Media;
 using Windows.UI.Xaml.Navigation;
+using Windows.Storage;
 
 
 // The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
@@ -24,15 +26,138 @@ namespace Pomotimer
     /// </summary>
     public sealed partial class MainPage : Page
     {
+        private DispatcherTimer dispatcherTimer;
+        public RunningState runningState = new RunningState();
+
+        private int RestMinutes { get; set; }
+        private int WorkMinutes { get; set; }
+
         public MainPage()
         {
             this.InitializeComponent();
 
+            // Some maigc numbers
             Size defaultSize = new Size(500, 250);
 
             ApplicationView.PreferredLaunchViewSize = defaultSize;
             ApplicationView.GetForCurrentView().SetPreferredMinSize(defaultSize);
             ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.PreferredLaunchViewSize;
+
+            Application.Current.Suspending += OnSuspending;
+            this.Loaded += MainPageLoaded;
+
+            ApplicationDataContainer roamingSettings = Windows.Storage.ApplicationData.Current.RoamingSettings;
+            Windows.Storage.ApplicationDataCompositeValue minutes = (ApplicationDataCompositeValue)roamingSettings.Values["Minutes"];
+            if (minutes != null)
+            {
+                WorkMinutes = (int)minutes["WorkMinutes"];
+                RestMinutes = (int)minutes["RestMinutes"];
+            }
+            else
+            {
+                // Some maigc defualt numbers
+                WorkMinutes = 40;
+                RestMinutes = 5;
+            }
+            runningState.MinutesLeft = WorkMinutes;
+            runningState.SecondsLeft = 0;
+
+        }
+        public void DispatcherTimerSetup()
+        {
+            dispatcherTimer = new DispatcherTimer();
+            dispatcherTimer.Tick += dispatcherTimer_Tick;
+            dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
+        }
+
+        void dispatcherTimer_Tick(object sender, object e)
+        {
+            if (runningState.SecondsLeft == 0)
+            {
+                runningState.SecondsLeft = 59;
+                if (runningState.MinutesLeft == 0)
+                {
+                    if (runningState.OnRest)
+                    {
+                        runningState.OnRest = false;
+                        runningState.MinutesLeft = WorkMinutes;
+                        runningState.SecondsLeft = 0;
+                    }
+                    else
+                    {
+                        runningState.OnRest = true;
+                        runningState.MinutesLeft = RestMinutes;
+                        runningState.SecondsLeft = 0;
+                    }
+                }
+                else
+                {
+                    runningState.MinutesLeft--;
+                }
+            }
+            else
+            {
+                runningState.SecondsLeft--;
+            }
+        }
+
+
+        private void PlayButton_Click(object sender, RoutedEventArgs e)
+        {
+            AppBarButton b = sender as AppBarButton;
+            dispatcherTimer.Start();
+            runningState.IsRunning = true;
+        }
+
+        private void PauseButton_Click(object sender, RoutedEventArgs e)
+        {
+            AppBarButton b = sender as AppBarButton;
+            dispatcherTimer.Stop();
+            runningState.IsRunning = false;
+        }
+
+        private void ResetButton_Click(object sender, RoutedEventArgs e)
+        {
+            AppBarButton b = sender as AppBarButton;
+            dispatcherTimer.Stop();
+            runningState.IsRunning = false;
+
+            runningState.OnRest = false;
+            runningState.MinutesLeft = WorkMinutes;
+            runningState.SecondsLeft = 0;
+        }
+
+        private void Plus1Button_Click(object sender, RoutedEventArgs e)
+        {
+            AppBarButton b = sender as AppBarButton;
+            runningState.MinutesLeft += 1;
+        }
+
+        private void Plus5Button_Click(object sender, RoutedEventArgs e)
+        {
+            AppBarButton b = sender as AppBarButton;
+            runningState.MinutesLeft += 5;
+        }
+
+        private void Plus10Button_Click(object sender, RoutedEventArgs e)
+        {
+            AppBarButton b = sender as AppBarButton;
+            runningState.MinutesLeft += 10;
+        }
+        private void OnSuspending(object sender, Windows.ApplicationModel.SuspendingEventArgs e)
+        {
+            var deferral = e.SuspendingOperation.GetDeferral();
+            ApplicationDataContainer roamingSettings = Windows.Storage.ApplicationData.Current.RoamingSettings;
+            Windows.Storage.ApplicationDataCompositeValue minutes = new Windows.Storage.ApplicationDataCompositeValue();
+            minutes["WorkMinutes"] = WorkMinutes;
+            minutes["RestMinutes"] = RestMinutes;
+            roamingSettings.Values["Minutes"] = minutes;
+            deferral.Complete();
+        }
+
+        private void MainPageLoaded(object sender, RoutedEventArgs e)
+        {
+            DispatcherTimerSetup();
         }
     }
 }

Pomotimer/Pomotimer.csproj

@@ -123,6 +123,7 @@
       <DependentUpon>MainPage.xaml</DependentUpon>
     </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="RunningState.cs" />
   </ItemGroup>
   <ItemGroup>
     <AppxManifest Include="Package.appxmanifest">
@@ -153,6 +154,9 @@
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
       <Version>6.2.9</Version>
     </PackageReference>
+    <PackageReference Include="Microsoft.Toolkit.Uwp.UI">
+      <Version>6.0.0</Version>
+    </PackageReference>
     <PackageReference Include="Microsoft.UI.Xaml">
       <Version>2.3.200213001</Version>
     </PackageReference>

Pomotimer/RunningState.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pomotimer
+{
+    public class RunningState : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+        private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        private bool _is_running;
+        public bool IsRunning
+        {
+            get { return _is_running; }
+            set
+            {
+                _is_running = value;
+                NotifyPropertyChanged("IsRunning");
+            }
+
+        }
+
+        public int _minutes_left;
+        public int MinutesLeft
+        {
+            get { return _minutes_left; }
+            set
+            {
+                _minutes_left = value;
+                NotifyPropertyChanged("MinutesLeft");
+            }
+
+        }
+
+        public int _seconds_left;
+        public int SecondsLeft
+        {
+            get { return _seconds_left; }
+            set
+            {
+                _seconds_left = value;
+                NotifyPropertyChanged("SecondsLeft");
+            }
+
+        }
+
+        public bool _on_rest;
+
+        public bool OnRest
+        {
+            get { return _on_rest; }
+            set
+            {
+                _on_rest = value;
+                NotifyPropertyChanged("OnRest");
+            }
+
+        }
+    }
+}